Document:

exv10w51

 

Exhibit 10.51

 

ASSET PURCHASE AGREEMENT

by and between

QUESTCOR PHARMACEUTICALS, INC.

and

QOL MEDICAL LLC

dated as of October 17, 2005

 

 

 

Table of Contents

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	Page
	ARTICLE I            DEFINITIONS	 	 	1	 
	 	 	 	 	 
	 	 	 	 
	 	Section 1.01.	 	Defined Terms
	 	 	1	 
	 	 	 	 	 
	 	 	 	 
	ARTICLE II            PURCHASE AND SALE OF ASSETS	 	 	9	 
	 	 	 	 	 
	 	 	 	 
	 	Section 2.01.	 	Purchase and Sale of Assets at the Closing
	 	 	9	 
	 	Section 2.02.	 	Excluded Assets
	 	 	10	 
	 	Section 2.03.	 	Retention of Copies of Certain Assets
	 	 	10	 
	 	Section 2.04.	 	Covenant Not To Compete
	 	 	11	 
	 	 	 	 	 
	 	 	 	 
	ARTICLE III            ASSUMPTION OF LIABILITIES	 	 	12	 
	 	 	 	 	 
	 	 	 	 
	 	Section 3.01.	 	Assumption of Liabilities
	 	 	12	 
	 	 	 	 	 
	 	 	 	 
	ARTICLE IV            CONSIDERATION AND PAYMENT	 	 	13	 
	 	 	 	 	 
	 	 	 	 
	 	Section 4.01.	 	Consideration
	 	 	13	 
	 	Section 4.02.	 	Allocation of Purchase Price
	 	 	13	 
	 	Section 4.03.	 	Sales, Use and Other Taxes
	 	 	13	 
	 	Section 4.04.	 	No Tax Withholding
	 	 	14	 
	 	 	 	 	 
	 	 	 	 
	ARTICLE V            CLOSING	 	 	14	 
	 	 	 	 	 
	 	 	 	 
	 	Section 5.01.	 	Time and Place
	 	 	14	 
	 	Section 5.02.	 	Deliveries at Closing
	 	 	14	 
	 	Section 5.03.	 	Payment to ISO-TEX Diagnostics, Inc
	 	 	15	 
	 	 	 	 	 
	 	 	 	 
	ARTICLE VI            REPRESENTATIONS AND WARRANTIES OF SELLER	 	 	15	 
	 	 	 	 	 
	 	 	 	 
	 	Section 6.01.	 	Organization
	 	 	15	 
	 	Section 6.02.	 	Authority of Seller
	 	 	16	 
	 	Section 6.03.	 	Consents and Approvals
	 	 	16	 
	 	Section 6.04.	 	Non-Contravention
	 	 	16	 
	 	Section 6.05.	 	Financial Information
	 	 	17	 
	 	Section 6.06.	 	Title to Purchased Assets; Inventory, Channel
	 	 	17	 
	 	Section 6.07.	 	Regulatory Issues;
	 	 	18	 
	 	Section 6.08.	 	Contracts
	 	 	18	 
	 	Section 6.09.	 	Intellectual Property Rights
	 	 	18	 
	 	Section 6.10.	 	Litigation
	 	 	20	 
	 	Section 6.11.	 	Compliance with Law
	 	 	20	 
	 	Section 6.12.	 	No Other Assets
	 	 	20	 
	 	Section 6.13.	 	Brokers
	 	 	20	 
	 	Section 6.14.	 	Customers and Suppliers
	 	 	21	 
	 	Section 6.15.	 	Marketing Rights
	 	 	21	 

i

 

 

Table of Contents

(continued)

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	Page
	 	Section 6.16.	 	Absence of Changes
	 	 	21	 
	 	Section 6.17.	 	Related Party Relationships
	 	 	21	 
	 	Section 6.18.	 	Disclosure
	 	 	21	 
	 	Section 6.19.	 	No Other Warranties
	 	 	21	 
	 	 	 	 	 
	 	 	 	 
	ARTICLE VII            REPRESENTATIONS AND WARRANTIES OF BUYER	 	 	22	 
	 	 	 	 	 
	 	 	 	 
	 	Section 7.01.	 	Organization
	 	 	22	 
	 	Section 7.02.	 	Authority of Buyer
	 	 	22	 
	 	Section 7.03.	 	Consents and Approvals
	 	 	22	 
	 	Section 7.04.	 	Non-Contravention
	 	 	23	 
	 	Section 7.05.	 	Litigation
	 	 	23	 
	 	Section 7.06.	 	Brokers
	 	 	23	 
	 	Section 7.07.	 	Disclosure
	 	 	23	 
	 	Section 7.08.	 	No Other Warranties
	 	 	23	 
	 	 	 	 	 
	 	 	 	 
	ARTICLE VIII            COVENANTS OF THE PARTIES	 	 	23	 
	 	 	 	 	 
	 	 	 	 
	 	Section 8.01.	 	Operation of the Business by Seller
	 	 	23	 
	 	Section 8.02.	 	Commercially Reasonable Efforts
	 	 	24	 
	 	Section 8.03.	 	Access
	 	 	24	 
	 	Section 8.04.	 	Public Announcements; Confidentiality
	 	 	25	 
	 	Section 8.05.	 	Returns, Rebates and Chargebacks
	 	 	26	 
	 	Section 8.06.	 	Multi-Product Contracts
	 	 	28	 
	 	Section 8.07.	 	Bulk Transfer Laws
	 	 	28	 
	 	Section 8.08.	 	Further Assurances
	 	 	28	 
	 	Section 8.09.	 	No Solicitation
	 	 	28	 
	 	Section 8.10.	 	Insurance
	 	 	29	 
	 	Section 8.11.	 	Post-Closing Assistance
	 	 	29	 
	 	Section 8.12.	 	Special Obligation Regarding Materiality Qualifications
	 	 	29	 
	 	 	 	 	 
	 	 	 	 
	ARTICLE IX            CONDITIONS TO THE OBLIGATIONS OF SELLER FOR THE CLOSING	 	 	30	 
	 	 	 	 	 
	 	 	 	 
	 	Section 9.01.	 	Representations, Warranties and Covenants
	 	 	30	 
	 	Section 9.02.	 	No Actions or Proceedings
	 	 	30	 
	 	Section 9.03.	 	Consents
	 	 	30	 
	 	Section 9.04.	 	Related Agreements and Nastech Clarification Amendment
	 	 	30	 
	 	 	 	 	 
	 	 	 	 
	ARTICLE X            CONDITIONS TO THE OBLIGATIONS OF BUYER FOR THE CLOSING	 	 	31	 
	 	 	 	 	 
	 	 	 	 
	 	Section 10.01.	 	Representations, Warranties and Covenants
	 	 	31	 
	 	Section 10.02.	 	No Actions or Proceedings
	 	 	31	 
	 	Section 10.03.	 	Consents
	 	 	31	 
	 	Section 10.04.	 	Related Agreements
	 	 	31	 
	 	Section 10.05.	 	Absence of Material Adverse Effects
	 	 	31	 

ii

 

 

Table of Contents

(continued)

	 	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	Page
	ARTICLE XI            INDEMNIFICATION	 	 	31	 
	 	 	 	 	 
	 	 	 	 
	 	Section 11.01.	 	Survival of Representations, Warranties, Covenants, Etc
	 	 	31	 
	 	Section 11.02.	 	Indemnification
	 	 	32	 
	 	Section 11.03.	 	Limitations
	 	 	35	 
	 	 	 	 	 
	 	 	 	 
	ARTICLE XII            TERMINATION AND ABANDONMENT	 	 	37	 
	 	 	 	 	 
	 	 	 	 
	 	Section 12.01.	 	Methods of Termination
	 	 	37	 
	 	Section 12.02.	 	Procedure upon Termination
	 	 	37	 
	 	Section 12.03.	 	Specific Performance
	 	 	38	 
	 	 	 	 	 
	 	 	 	 
	ARTICLE XIII            MISCELLANEOUS	 	 	38	 
	 	 	 	 	 
	 	 	 	 
	 	Section 13.01.	 	Notices
	 	 	38	 
	 	Section 13.02.	 	Entire Agreement
	 	 	39	 
	 	Section 13.03.	 	Waiver
	 	 	39	 
	 	Section 13.04.	 	Amendment
	 	 	39	 
	 	Section 13.05.	 	Third Party Beneficiaries
	 	 	39	 
	 	Section 13.06.	 	Assignment; Binding Effect
	 	 	40	 
	 	Section 13.07.	 	Headings
	 	 	40	 
	 	Section 13.08.	 	Severability
	 	 	40	 
	 	Section 13.09.	 	Governing Law; Venue
	 	 	40	 
	 	Section 13.10.	 	Equitable Relief
	 	 	40	 
	 	Section 13.11.	 	Expenses
	 	 	41	 
	 	Section 13.12.	 	Counterparts
	 	 	41	 

iii

 

 

ASSET PURCHASE AGREEMENT

     This Asset Purchase Agreement (this “Agreement”) is made and entered into as of October 17,
2005, by and between QOL Medical LLC, a limited liability company (“Buyer”), and Questcor
Pharmaceuticals, Inc., a California corporation (“Seller”).

RECITALS

     This Agreement sets forth the terms and conditions upon which Buyer is purchasing the
Purchased Assets (as defined below) and assuming the Assumed Liabilities (as defined below) from
Seller, and Seller is selling the Purchased Assets and transferring the Assumed Liabilities to
Buyer.

AGREEMENT

     In consideration of the premises and the mutual covenants and promises contained herein, and
for other good and valuable consideration, the receipt and sufficiency of which hereby are
acknowledged, the parties agree as follows:

ARTICLE I

DEFINITIONS

     Section 1.01. Defined Terms. As used in this Agreement, the following defined terms
shall have the meanings specified below:

     “Accounts Receivable” means all trade accounts and notes receivable and other miscellaneous
receivables, including those that are not evidenced by instruments or invoices, existing as of the
Closing Date.

     “Action or Proceeding” means any action, suit, proceeding, arbitration, Order, inquiry,
hearing, assessment with respect to fines or penalties or litigation (whether civil, criminal,
administrative or investigative) commenced, brought, conducted or heard by or before, or otherwise
involving, any Governmental Regulatory or other Authority.

     “Activity Date” has the meaning set forth in Section 8.05(b)

     “Affiliate” means, with respect to any Person, any other Person which Controls, is Controlled
by or is under common Control with such Person.

     “Agreement” has the meaning set forth in the preamble hereto.

     “Assumed Contracts” has the meaning set forth in Section 2.01(a).

     “Assumed Liabilities” has the meaning set forth in Section 3.01(a).

     “Bill of Sale” means the Bill of Sale and Assignment and Assumption Agreement to be dated the
Closing Date conveying the Purchased Assets from Seller to Buyer and providing for the assignment
to and assumption of the Assumed Liabilities by Buyer, substantially in the form attached hereto as
Exhibit A.

 

 

     “Books and Records” means all books, records, files, documents and recorded information
(including, without limitation, all clinical data, all customer lists, credit and collection
records and miscellaneous records related primarily to the Assets with respect to customers and
supply sources), all adverse event reports, all data, information and files relating to adverse
experiences, all medical responses and written phone and personnel contact inquiries, and all
information and correspondence relative to the Assets including all information and correspondence
provided to or received from the FDA and all other reports provided to the FDA or any other
Governmental or Regulatory Authority (including all supporting records and data) owned by Seller or
any of its Affiliates as of the Closing Date.

     “Business” means the distribution, marketing, sale, promotion and use of the Products.

     “Business Day” means a day other than Saturday, Sunday or any day on which commercial banks
located in New York are authorized or obligated by Law to close.

     “Buyer” has the meaning set forth in the preamble hereto.

     “Buyer Adverse Effect” means an effect or condition that individually or when taken together
with all other effects or conditions of like nature would have, or would be reasonably expected to
have, a material adverse effect (i) on the business, assets, results of operations or financial
condition of Buyer, taken as a whole, other than any effect or condition relating (x) to the
economy in general, or (y) in general to the pharmaceutical industry in which Buyer operates and
not specifically relating to Buyer; provided, that Buyer, taken as a whole, is not materially
disproportionately affected as compared to other Persons engaged in such industry by such effect or
condition; or (ii) on the ability of Buyer to perform its obligations under this Agreement and the
Related Agreements or on the ability of Buyer to consummate the transactions contemplated hereby
and thereby.

     “Buyer Disclosure Schedule” has the meaning set forth in the preamble to Article VII.

     “Buyer Governmental Consents” has the meaning set forth in Section 7.03(a).

     “Buyer Indemnitees” has the meaning set forth in Section 11.02(a).

     “Buyer Proceeding” means any Action or Proceeding commenced by or against any of Buyer or any
of its Affiliates or officers or directors after the date of this Agreement.

     “Buyer Taxes” has the meaning set forth in Section 4.03.

     “Buyer Third Party Consents” has the meaning set forth in Section 7.03(b).

     “Charter Documents” means, with respect to a Person, the articles of incorporation, operating
agreement, bylaws or other similar governing instruments and organizational documents of such
Person.

     “Closing” has the meaning set forth in Section 5.01.

     “Closing Date” has the meaning set forth in Section 5.01.

     “Code” means the Internal Revenue Code of 1986, as amended.

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     “Confidential Information” has the meaning set forth in Section 8.04(b).

     “Confidentiality Agreement” has the meaning set forth in Section 8.04(c).

     “Consideration” has the meaning set forth in Section 4.01(a).

     “Contracts” means any and all binding commitments, contracts, purchase orders, leases,
licenses, easements, commitments, arrangements, undertakings or other written or oral agreements.

     “Control” means:

          (a) ownership (directly or indirectly) of at least fifty percent (50%) of the shares of stock
entitled to vote for the election of directors in the case of a company or corporation; or

          (b) the ability otherwise to direct and control the actions of a Person, other than a company
or a corporation.

     “Copyrights” means copyrights, whether registered or unregistered, and applications, if any,
for any and all original works of authorship that have been fixed in a tangible medium of
expression and relate primarily to the use, development, formulation, manufacture, marketing,
distribution, promotion or sale of the Products or that are currently utilized in connection with
the use, development, formulation, manufacture, marketing, distribution, promotion or sale of the
Products, but excluding any portion of such material which does not relate to the Products.

     “Corporate Names” means the trademark and service mark “QUESTCOR”, the corporate logos and
trade names of Seller, including the word “QUESTCOR” together with any variations and derivatives
thereof and any other logos, symbols or trademarks, trade names or service marks of Seller, but
excluding the Trademarks..

     “Covenant Not To Compete” means the Covenant Not to Compete contained in Section 2.04 hereof.

     “Damages” has the meaning set forth in Section 11.02(a).

     “Default” means (a) a breach, default or violation, (b) the occurrence of an event that with
or without the passage of time or the giving of notice, or both, would constitute a breach, default
or violation or cause an Encumbrance to arise, or (c) with respect to any Contract, the occurrence
of an event that with or without the passage of time or the giving of notice, or both, would give
rise to a right of termination, renegotiation or acceleration or a right to receive Damages or a
payment of penalties.

     “Encumbrance” means any mortgage, pledge, assessment, security interest, deed of trust, lease,
lien, levy, license, restriction on transferability, defect in title, charge, lien or claim for
Taxes, or other encumbrance of any kind, or any conditional sale or title retention agreement or
other agreement to give any of the foregoing in the future.

     “Excluded Assets” has the meaning set forth in Section 2.02.

     “Excluded Intellectual Property” means any intellectual property rights, or portion thereof,
including but not limited to any patent, copyright, trademark, trade secret or other proprietary
rights,

3

 

that are owned or controlled by Seller or any of its Affiliates, that both (i) does not relate
to the use, development or formulation of the Products or the sale or distribution of the Products
and (ii) that is not required for the use, development, formulation, sale or distribution
of the Products consistent with Seller’s current practices.

     “Excluded Liabilities” has the meaning set forth in Section 3.01(b).

     “FDA” means the United States Food and Drug Administration or any successor thereto.

     “FDA Act” means the U.S. Federal Food, Drug and Cosmetic Act of 1938, as it may be superseded
or amended from time to time.

     “FSS” has the meaning set forth in Section 8.05(b).

     “Governmental or Regulatory Authority” means the United States, Canada, any Member State of
the European Union, any other country, any supranational organization, any state, province, county,
city or other political subdivision of any of the foregoing or any court, tribunal, arbitrator,
authority, agency, commission, ministry, official or other instrumentality of any of the foregoing.

     “Governmental Permits” means the governmental permits, licenses, registrations, certificates
of occupancy, approvals and other governmental authorizations set forth on Schedule
1.01(a).

     “IND” means (a) an Investigational New Drug Application, as defined in the FDA Act, as
amended, and the regulations promulgated thereunder (C.F.R. Parts 312-312.38), which is required to
be filed (except under circumstances as described in such regulations promulgated thereunder) with
the FDA before beginning clinical testing of a product in human subjects, or any successor
application or procedure, (b) all related FDA approvals, and (c) all supplements and amendments
that may be filed with respect to the foregoing.

     “Indemnification Claim Notice” has the meaning set forth in Section 11.02(c).

     “Indemnified Party” has the meaning set forth in Section 11.02(c).

     “Indemnitees” has the meaning set forth in Section 11.02(c).

     “Inventory” means all inventory of finished Product owned as of the Closing Date by Seller or
any of its Affiliates, together with all work-in-progress and all bulk active pharmaceutical
ingredient owned as of the Closing Date by Seller or any of its Affiliates.

     “Know-How” means the proprietary or nonproprietary information, and all enhancements and
improvements, including but not limited to that set forth on Schedule 1.01(b) that is
material to the formulation, preparation, development (both research and clinical), manufacture,
use or commercialization of the Products, including but not limited to internal studies performed
by Seller or its Affiliates or their predecessors in interest to the Products (to the extent
available to Seller) relating to new formulations of or delivery methods for the Products, but in
no event shall this definition of “Know-How” include any Excluded Intellectual Property or any
information properly in the public domain as of the Closing Date.

     “Knowledge” with respect to (i) Seller, means the knowledge following reasonable investigation
of the books and records of the Seller (irrespective of whether such books or records are

4

 

primarily or incidentally related to the Products, Assets or the Business), including without
limitation the Books and Records, and inquiry of the officers, directors, managers and employees of
Seller with responsibility for, or supervision of, the relevant matters, and (ii) Buyer, means the
knowledge following reasonable investigation of the officers, directors and managers of Buyer with
responsibility for supervision of the relevant matters.

     “Labeling” has the meaning set forth in Section 201(m) of the FDA Act, 21 U.S.C. § 321(m), and
shall include the applicable Products’ label, packaging and package inserts accompanying such
Products, and any other written, printed, or graphic materials accompanying such Products,
including, but not limited to, patient instructions or patient indication guides and the NDC
numbers relating to the Products.

     “Law” means any federal, state, local or foreign law, statute or ordinance, or any rule or
regulation promulgated by any Governmental or Regulatory Authority.

     “Liability” means any direct or indirect liability, obligation, claim, guarantee or commitment
of any kind or nature (whether known or unknown, asserted or unasserted, absolute or contingent,
accrued or unaccrued, liquidated or unliquidated or due or to become due), including any liability
for Taxes.

     “Material Adverse Effect” means (i) any material adverse effect on the Assets or the business,
assets, results of operations or financial condition of the Business, taken as a whole, other than
any effect or condition relating (x) to the economy in general, or (y) in general to the
pharmaceutical industry in which the Business operates and not specifically relating to the
Business; provided, that the Business, taken as a whole, is not disproportionately affected as
compared to other Persons engaged in such industry by such effect or condition; or (ii) a condition
that individually or when taken together with all other effects or conditions of like nature would
have a material adverse effect on the ability of Seller to perform its obligations under this
Agreement and the Related Agreements or on the ability of Seller to consummate the transactions
contemplated hereby and thereby; provided, however, that the entry into the marketplace of a
generic equivalent to any of the Products shall not be a Material Adverse Effect unless the Seller
has Knowledge that such entry is currently under development by a third party and fails to disclose
such fact (to the extent of Seller’s Knowledge) to Buyer in writing prior to the execution of this
Agreement.

     “Multi-Product Contract” has the meaning set forth in Section 8.06.

     “Nascobal” means the intranasally delivered cyanocobalamin formulation marketed under the
brand name Nascobal® (which includes the gel formulations currently marketed by Seller and the
spray formulation for which approval to market has recently been given by the FDA).

     “Nascobal Patent Rights” means the Patent Rights set forth on Schedule 1.01(c).
Except as set forth on Schedule 1.01(c), “Nascobal Patent Rights” shall not include
inchoate inventions not yet reduced to practice, except to the extent Seller owns or is currently
entitled to receive rights to such from Nastech (which rights are included in Nascobal Patent
Rights hereunder).

     “Nastech” shall have the meaning set forth in Section 3.01(a)(ii).

     “Nastech Agreement” shall have the meaning set forth in Section 3.01(a)(ii).

5

 

     “Nastech Agreement Assignment” means the Nastech Agreement Assignment to be dated as of the
Closing Date by and between Buyer and Seller, and consented to by Nastech, substantially in the
form attached hereto as Exhibit B.

     “Nastech Clarification Agreement” shall have the meaning set forth in Section 9.04.

     “Nastech Payment” shall have the meaning set forth in Section 3.01(a)(ii).

     “Nastech Supply Agreement” means that certain Supply Agreement entered into on June 16, 2003,
between Nastech and Seller.

     “Nastech Supply Agreement Assignment” means the Nastech Supply Agreement Assignment to be
dated as of the Closing Date by and between Buyer and Seller, substantially in the form attached
hereto as Exhibit B-2.

     “NDA” means a New Drug Application for any product, as appropriate, requesting permission to
place a drug on the market in accordance with 21 C.F.R. Part 314, all FDA approvals relating
thereto, and all supplements or amendments filed pursuant to the requirements of the FDA, including
all documents, data and other information concerning a product which are reasonably necessary for
FDA approval to market a product in the United States, and all correspondence with the FDA.

     “Notice” means notice given in accordance with the terms of Section 13.01 of this Agreement.

     “Note” shall have the meaning set forth in Section 5.02(a)(vi).

     “Other Potential Patent Rights” means any and all rights that Seller may have with respect to
the patents set forth on Schedule 1.01(d), which patents may be expired, have lapsed or
otherwise be unenforceable.

     “Order” means any writ, judgment, decree, injunction or similar order, including consent
orders, of any Governmental or Regulatory Authority (in each such case whether preliminary or
final).

     “Ordinary Course of Business” means an action that is commercially reasonable and consistent
in nature, scope and magnitude with the past practices of Seller and its Affiliates with respect to
the Business as conducted by Seller.

     “Patent Rights Assignment Agreement” means the Patent Rights Assignment Agreement relating to
the Other Potential Patent Rights to be dated as of the Closing Date by and between Buyer and
Seller, substantially in the form attached hereto as Exhibit C.

     “Patent Rights” means, solely relating to Nascobal, the rights conferred or represented by a
granted or issued patent in force, or such like rights related to a patent application, and any
divisionals, continuations, continuations-in-part, provisionals, substitutions, reissues,
extensions, reexaminations or renewal applications related to, or claiming priority to, the
foregoing or any confirmation patent or registration patent, and all patents issuing relating to
any of the foregoing, and/or covering any spray formulation of Vitamin B-12, including without
limitation, any and all patents and residual rights relating to patents or similar rights or
protection previously obtained with

6

 

respect to Nascobal in gel form, the Spray Patent Applications and any patents issued
resulting therefrom, and all rights of Seller to acquire from Nastech Pharmaceutical Company, Inc.
(“Nastech”) any patents, patent applications, or other rights relating to Nascobal as contemplated
in that certain Asset Purchase Agreement dated June 16, 2003 between Seller and Nastech.

     “Permitted Encumbrance” means, collectively, (a) Encumbrances specifically listed on
Schedule 1.01(e), and (b) any Encumbrances caused by acts of Buyer and judgments against
Buyer and those claiming by, through or under Buyer.

     “Person” means any natural person, corporation, general partnership, limited partnership,
limited liability company, proprietorship, joint venture, other business organization, trust,
entity, union, association or Governmental or Regulatory Authority.

     “Pre-Closing Tax Period” means all taxable periods ending on or before the Closing Date and
the portion ending on the Closing Date of any taxable period that includes (but does not end on)
the Closing Date.

     “Product Books and Records” means the Books and Records relating to the Products or that are
necessary for the continuation of the operations and reporting obligations with respect to the
Products and the Business or that are necessary to identify and protect the rights with respect to
the Products, Purchased Assets or the Business to be acquired by Buyer pursuant to this Agreement,
including without limitation all clinical data relating to the Products and those Books and Records
set forth on Schedule 1.01(f) but excluding any portion of such material which does not
relate to the Products.

     “Product Marketing Materials” shall mean all sales training, marketing, camera-ready art in
electronic or hard-copy form and other promotional materials, including all web-based promotional
or informational materials, used with respect to the Products that are in existence as of the
Closing Date to the extent such materials are within the possession, custody or control of Seller.

     “Product Registrations” means (i) the approvals or registrations which have been applied for
or received by Seller or its predecessors in interest before the Closing Date, for the
investigation, production (by third parties), sale, distribution and/or marketing of the Products
(including any NDAs or INDs), and (ii) all dossiers, reports, data and other written materials
filed as part of such approvals or registrations, or maintained by Seller and relating to such
approvals or registrations.

     “Products” means Nascobal, Ethamolin® (Ethanolamine Oleate) and
Glofil®-125 (Iothalamate Sodium, I-125).

     “Purchased Assets” has the meaning set forth in Section 2.01.

     “Purchased Intellectual Property” means the Trademarks, the Copyrights, the Assigned Patent
Rights, the Nascobal Patent Rights and the Know-How, in each case solely relating, or that
materially relate, to the use, development, formulation, manufacture, marketing, sale or
distribution of the Products, including discoveries and improvements thereto, rights of invention
related thereto, any common law rights and goodwill related thereto, right to exclude others from
appropriating any of such, including the right to sue or seek remedies against past or future
infringement of any of the foregoing; provided that, notwithstanding anything to the contrary
contained herein, in no event shall Purchased Intellectual Property include any Excluded
Intellectual Property. When used in Article VI

7

 

hereof, the term “Purchased Intellectual Property” shall expressly exclude the Other Potential
Patent Rights, as Seller expressly disclaims any and all representations and warranties, whether
express or implied, with respect to the Other Potential Patent Rights.

     “Related Agreements” means the Bill of Sale, the Nastech Agreement Assignment, the Nastech
Supply Agreement Assignment, the Patent Rights Assignment Agreement and the Trademark Assignment
Agreement.

     “Seller” has the meaning set forth in the preamble.

     “Seller Companies Proceeding” means any Action or Proceeding commenced by or against any of
Seller or any of its Affiliates or officers or directors prior to the date of this Agreement.

     “Seller Disclosure Schedule” has the meaning set forth in the preamble to Article VI.

     “Seller Governmental Consents” has the meaning set forth in Section 6.03(a).

     “Seller Indemnitees” has the meaning set forth in Section 11.02(b).

     “Seller SEC Reports” means all reports, registration statements, proxy statements and other
document filed by or on behalf of Seller with the Securities and Exchange Commission.

     “Seller Taxes” has the meaning set forth in Section 4.03.

     “Seller Third Party Consents” has the meaning set forth in Section 6.03(b).

     “Spray Patent Applications” shall mean (i) U.S. Provisional Patent Application No 60/451,899,
“Cyanocobalamin Low Viscosity Aqueos Formulations for Intranasal Delivery” filed March 4, 2003;
(ii) U.S. Provisional Application Docket No. 03-02P2, “Cyanocobalamin Low Viscosity Aqueos
Formulations for Intranasal Delivery” filed April 4, 2003; (iii) all U.S. applications claiming
priority from (i) and/or (ii) (including all continuations, continuations-in-part, reexaminations,
reissues, and extensions thereof); and (iv) and any additional patent application with claims
covering a spray formulation of the Product.

     “Subsidiary” of a Person means any entity Controlled by that Person.

     “Taxes” means all of the following in connection with the operation of the Business or the
transactions contemplated hereby: (i) any net income, withholding, deduction, alternative or
add-on minimum tax, gross income, gross receipts, sales, use, value added, ad valorem, transfer,
franchise, profits, license, excise, severance, stamp, occupation, premium, property, environmental
or windfall profit tax, capital tax, customs duty or other tax, governmental fee or other like
assessment imposed by any governmental, regulatory or administrative entity or agency responsible
for the imposition of any such tax (domestic or foreign); (ii) any Liability for the payment of any
amounts of the type described in (i) as a result of being a member of any affiliated, consolidated,
combined, unitary or other group for any taxable period; and (iii) any Liability for the payment of
any amounts of the type described in (i) or (ii) as a result of any express or implied obligation
to indemnify any other Person.

     “Termination Date” has the meaning set forth in Section 12.01(b).

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     “Third Party Acquisition Proposal” means, other than in connection with the transactions
contemplated by this Agreement, any proposal relating to the acquisition of all or part of the
Purchased Assets.

     “Third Party Intellectual Property” means any intellectual property rights, including but not
limited to any patent, copyright, trademark, trade secret or other proprietary rights, that are
owned or controlled by any party other than a party to this Agreement.

     “Third Party Claim” has the meaning set forth in Section 11.02(d).

     “Trademark Assignment Agreement” means the Trademark Assignment Agreement to be dated as of
the Closing Date by and between Buyer and Seller, substantially in the form attached hereto as
Exhibit C.

     “Trademarks” means the trademarks, trade names, designs and logos set forth on Schedule
1.01(g) of the Seller Disclosure Schedule and the goodwill symbolized thereby.

ARTICLE II

PURCHASE AND SALE OF ASSETS

     Section 2.01. Purchase and Sale of Assets at the Closing. Upon the terms and subject
to the conditions set forth in this Agreement, at the Closing, Seller shall sell, convey, assign,
transfer and deliver to Buyer, and Buyer shall purchase and acquire from Seller, all of Seller’s
worldwide right, title and interest in and to the following assets relating primarily to the
Business or which are required for the conduct of the Business as currently conducted by Seller,
free and clear of all Encumbrances, other than Permitted Encumbrances (collectively, the “Purchased
Assets”):

          (a) the rights and interests of Seller under each of the Contracts set forth on Schedule
2.01(a) of the Seller Disclosure Schedule, including warranty rights from vendors of the
Products in Inventory transferred hereby, subject to any terms and conditions contained in any
written agreements and set forth on Schedule 2.01(a) by which such rights and interests are
assigned to Buyer (the “Assumed Contracts”);

          (b) all Product Books and Records;

          (c) all Inventory;

          (d) all Purchased Intellectual Property (including the Other Potential Patent Rights);

          (e) all Product Registrations;

          (f) all Product Marketing Materials;

          (g) all Governmental Permits, to the extent legally transferable;

          (h) the existing lists (including contact, shipping and billing information) of all current
customers for the Products and the pricing of the Products for such customers, together with all
available customer sales data and copies of any active sales contracts or purchase orders;

9

 

provided, however, that Seller shall retain all rights of access and ownership of such
information with respect to sales of other products of Seller;

          (i) all websites and web addresses relating to the Products, including all data and
information content included therein;

          (j) all other rights and interests of Seller with respect to the Business or relating to or
required for the use, research, exploitation or commercialization of the Products, including all
rights of Seller of any nature with respect to the formulation, study, manufacture, marketing,
sale, and distribution of the Products and any derivatives or variations thereof and any additional
usages or indications to which the Products now or hereafter may be determined to be of
application;

          (k) all rights of Seller pursuant to that certain Asset Purchase Agreement dated June 16, 2003
between Seller and Nastech (the “Nastech APA”) (1) with respect to Nascobal, (2) to acquire any
future rights relating to Nascobal (to the extent Seller has not heretofore acquired such rights),
(3) any all agreements and covenants of Nastech granted thereunder pursuant to which Nastech agreed
not to license certain “Know-How” defined therein to third parties and to take steps to prevent
third parties from utilizing such “Know-How, and (4) such other rights granted Seller thereunder
with respect to Nascobal and the protection of Seller’s interests therein; and

          (l) any other assets set forth on Schedule 2.01(i) of the Seller Disclosure Schedule.

     Section 2.02. Excluded Assets. Notwithstanding anything to the contrary contained in
this Agreement, other than Section 2.01, from and after the Closing, Seller shall retain all of its
right, title and interest in and to all of its assets other than the Purchased Assets (the
“Excluded Assets”), including, without limitation:

          (a) all cash and cash equivalents of Seller or any of its Affiliates;

          (b) all Accounts Receivable of Seller or any of its Affiliates;

          (c) the Corporate Names;

          (d) all Excluded Intellectual Property;

          (e) any refund or credit of Taxes attributable to any Pre-Closing Tax Period;

          (f) all Books and Records other than the Product Books and Records; and

          (g) all tangible personal property owned by Seller and used outside of, or that is both not
primarily used in connection with and not required in the conduct of, the Business as of the
Closing Date;

provided, that Seller hereby grants to Buyer an exclusive, perpetual, royalty-free license, with
the right to sublicense, to use the Excluded Intellectual Property solely for the purposes of
developing, formulating, manufacturing Products, and marketing, selling, distributing, and using
Products.

     Section 2.03. Retention of Copies of Certain Assets. Notwithstanding anything to the
contrary contained in this Agreement, Seller may retain, at its expense, archival copies of all

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Assumed Contracts, Product Books and Records and other documents or materials conveyed
hereunder; provided that Seller maintains such items in confidence in accordance with the
provisions of Section 8.04.

     Section 2.04. Covenant Not To Compete.

          (a) The Seller, on behalf of itself and its Affiliates, hereby covenants and agrees that, for
a period of six years beginning on the Closing Date (the “Restriction Period”), neither Seller nor
its Affiliates shall, anywhere in the world, formulate, develop, produce, manufacture, market, sell
or distribute (either through its own efforts or by contracting with or licensing a third party to
do any of the foregoing) any product that (i) contains cyanocobalamin as an active ingredient
formulated for intranasal delivery, (ii) can be used to determine glomerular filtration rate, (iii)
can be utilized in the treatment of the indications set forth on Schedule 2.04, or (iv) contains
the active ingredients contained in any of the Products (products includible in any of sub parts
(i) – (iv) of the previous sentence, the “Competing Products”). Other products that contain the
active ingredients contained in any of the Products shall not be considered Competing Products if
the presence of such ingredient is present solely as a carrier and is not sold for treatment of any
of the indications for which any of the Products are sold. During the Restriction Period, neither
Seller nor its Affiliates shall prepare for or pursue (or assist a third party in preparing for or
pursuing) an IND or NDA (in the USA, or its equivalent in any other country in the world) with
respect to the Products (including any additional indications with respect thereto) or any
Competing Product, nor shall Seller or any of its Affiliates formulate, develop, use, or
commercially exploit (or assist any third party in such) the Products or the active ingredients
thereof anywhere in the world for any usages (except usages solely as a carrier (but not as the
active ingredient) for drugs to be utilized for indications other than those for which the Products
are sold). For purposes of this Section 2.04, the provision of, or allowing access to, any Product
related Know-how to third parties shall be considered “assisting” such third party in violation of
this Section 2.04. This covenant shall not apply to then existing or future operations of any
Person that acquires the Company (including its continuation of such then existing operations), by
way of merger, stock purchase, asset purchase or otherwise, or any of such Person’s Affiliates
provided such acquirer thereafter does not utilize any assets, rights, know-how, facilities,
clinical data, sales or marketing or distribution systems of the Seller or its Affiliates (that
were Affiliates prior to such acquisition), or any employees of the Seller or its Affiliates (that
were Affiliates prior to such acquisition) in the activities that would, but for this sentence, be
a violation of this Section 2.04. This covenant shall further not apply to any of Seller’s
shareholders and other Affiliates of Seller that are not controlled or employed by Seller
(“Excluded Affiliates”) provided that any such Excluded Affiliate does not utilize any assets,
rights, know-how, facilities, clinical data, sales or marketing or distribution systems of Seller
or obtained from the Seller (unless such was misappropriated or otherwise wrongfully obtained), or
any employees of the Seller in the activities that would, but for this sentence, be a violation of
this Section 2.04.

          (b) Seller, for itself and its Affiliates, acknowledges and agrees that (i) the covenants
contained in this Section 2.04 are incident to the sale of the Business and the Products and are an
important part of the consideration to be received by Buyer in exchange for the consideration paid
by Buyer pursuant hereto; (ii) the activities prohibited by this Section 2.04 are not Seller’s only
means for business and are not required for the continuation of its business; (iii) that the Buyer
is relying on the covenants contained in this Section 2.04 in its decision to enter into this
Agreement and purchase the Business and Purchased Assets; (iv) the Buyer has a right to protection
from competition from the Seller and its current Affiliates during the Restriction Period; and (v)
the Buyer has a valid interest in preventing such competition throughout the United States and the
entire world.

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          (c) Each of the provisions of this Section 2.04 shall be construed as an agreement independent
of any other provision contained in this Section 2.04 or elsewhere in this Agreement, and the
restrictions herein with respect to each of the States in the United States and each country in the
world shall be an agreement independent of the restrictions with respect to the other States or
other countries, and each provision (and the restrictions with respect to each such state or
country) shall be enforceable in both law and equity, including by temporary or permanent
restraining orders or injunctions, notwithstanding the existence of any claim or cause of action
Seller may have or claim against Buyer, whether predicated on this Agreement or otherwise. In the
event any provision of this Section 2.04, or the restrictions with respect the conduct that
constitutes competition, to any one or more States or countries, or the time period of the
restrictions, are held to be invalid or overbroad, then such provisions, States or countries shall
be modified, reduced, or deleted if deemed appropriate, by the applicable court such that the
remainder of this Section 2.04, restricted conduct, the States and countries included in the
restricted territory, and the time period, as thus modified shall remain in full force and effect.
During each period in which Seller is in breach of this Section 2.04 of this Agreement, the
Restriction Period in the applicable country shall be extended for the length of each such period
of breach. Seller acknowledges and agrees that a breach by Seller of the covenants set forth in
this Section 2.04 will cause irreparable damage to Buyer and the Business and, therefore, Seller
agrees that in the event it or its Affiliates breaches any of such covenants, Buyer is entitled to
a grant of injunctive relief from a court of competent jurisdiction in addition to any and all
other remedies allowed by law or in equity, without the requirement to post bond.

ARTICLE III

ASSUMPTION OF LIABILITIES

     Section 3.01. Assumption of Liabilities.

          (a) Upon the terms and subject to the conditions set forth in this Agreement, as of the
Closing Date, Buyer agrees to assume, satisfy, perform, pay and discharge only the following
Liabilities (the “Assumed Liabilities”): all Liabilities of Seller under the Assumed Contracts,
but only to the extent such Liabilities arise from any event, circumstance or condition occurring
in a period (or portion thereof) following the Closing (any pro-rated portion of Liabilities that
relate to pre-Closing periods shall remain Liabilities of Seller) (for avoidance of doubt, Seller’s
obligation under that certain Asset Purchase Agreement dated June 16, 2003 (the “Nastech
Agreement”), by and between Seller and Nastech Pharmaceutical Company, Inc. (“Nastech”), to pay
Nastech $2,000,000 (the “Nastech Payment”)in the event the United States Patent and Trademark
Office issues a patent to Nastech claiming priority from any of the Spray Patent Applications, is
an Assumed Liability provided Nastech assigns all rights relating to such patent and all related
applications to Buyer).

          (b) Notwithstanding anything contained in this Agreement to the contrary, from and after the
Closing Date, Seller shall retain, and Buyer shall have no liability with respect to all of the
following Liabilities (“Excluded Liabilities”):

               (i) all accounts payable and other Liabilities of Seller for materials and services with
respect to the manufacture of the Products incurred prior to or on the Closing Date;

               (ii) all Liabilities of Seller arising out of any product liability, patent infringement,
breach of warranty or similar claim for injury to person or property which resulted

12

 

from the use or misuse of Products sold prior to or on the Closing Date (including all Actions
or Proceedings relating to any such Liabilities);

               (iii) all Liabilities of Seller arising out of government seizures, field corrections,
withdrawals or recalls of Products which relate to Products sold on or prior to the Closing Date;

               (iv) all Liabilities of Seller with respect to any litigation or other claims arising out of
or relating to, directly or indirectly, the Purchased Assets (including the Products) to the extent
arising from any event, circumstance or condition occurring or alleged to have occurred prior to or
on the Closing Date;

               (v) all Liabilities of Seller arising out of user or other similar fees payable to the FDA or
other Governmental or Regulatory Authority to the extent that such fees are due and payable on
account of the operation of the Business by Seller prior to the Closing Date; and

               (vi) any other Liability of Seller that is not an Assumed Liability under Section 3.01(a).

          (c) Seller and Buyer agree to prorate as of the Closing Date any amounts under the Assumed
Contracts or arising out of user or other similar fees payable to the FDA or any other Governmental
or Regulatory Authority with respect to the Products which become due and payable after the Closing
Date to the extent the benefit is attributable to the period on or prior to the Closing Date, and
any amount thereunder which are paid prior to the Closing Date to the extent the benefit is
attributable to the period subsequent to the Closing Date.

ARTICLE IV

CONSIDERATION AND PAYMENT

     Section 4.01. Consideration. As consideration for the Purchased Assets and the
Covenant Not to Compete, at the Closing, Buyer shall:

          (a) deliver or cause to be delivered to Seller the sum of $28,340,000 (the “Consideration”) by
electronic funds transfer of immediately available funds to the account specified by Seller; and

          (b) assume the Assumed Liabilities.

          The Consideration shall be exclusive of any value added, sales, use or other similar tax
which, if charged, shall be payable by Buyer.

     Section 4.02. Allocation of Purchase Price. The Purchase Price shall be allocated
among the Purchased Assets transferred by Seller as set forth on Exhibit 4.02, and Buyer
and Seller agree (a) to report the sale and purchase of the Purchased Assets for Tax purposes in
accordance with such allocation and (b) not to take any position inconsistent with such allocation
on any of their respective tax returns.

     Section 4.03. Sales, Use and Other Taxes. All transfer (other than sales or use
taxes) documentary, gross receipts, income, stamp, duty, registration, or other similar Taxes
(collectively,

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“Seller Taxes”) incurred in connection with the transfer and sale of the Purchased Assets as
contemplated by the terms of this Agreement and the Related Agreements, including all recording or
filing fees and notarial fees that may be imposed, payable, collectible or incurred shall be the
responsibility of Seller. Buyer shall be responsible for all sales, use, value-added and other
similar Taxes assessed by virtue of the transaction contemplated herein (collectively, the “Buyer
Taxes”).

     Section 4.04. No Tax Withholding. All payments under or contemplated by this
Agreement or the Related Agreements will be made without any deduction or withholding for or on
account of any Taxes.

ARTICLE V

CLOSING

     Section 5.01. Time and Place. The parties intend to close the transactions
contemplated by this Agreement, including the purchase and sale of the Purchased Assets and the
assumption of the Assumed Liabilities (the “Closing”) concurrent with the execution of this
Agreement. Otherwise, unless this Agreement is earlier terminated pursuant to Article XII, the
Closing shall take place as promptly as practicable, but in no event later than two (2) Business
Days following satisfaction or waiver of the conditions set forth in Articles IX and X, at 10:00
a.m., Pacific time, at the offices of Stradling Yocca Carlson & Rauth, 660 Newport Center Drive,
Newport Beach, California 92660 (which Closing may be conducted in part by telephone/facsimile),
unless another time or place shall be agreed to by the parties (the “Closing Date”).

     Section 5.02. Deliveries at Closing.

          (a) Closing Deliveries by Seller. At the Closing, Seller shall deliver or cause to be
delivered to Buyer:

               (i) an original of each of the Related Agreements, executed by Seller, and copies of all
documents required to be delivered by Seller pursuant to this Agreement and the Related Agreements;

               (ii) assignment and assumption agreements and/or subcontracts, as applicable, in form and
substance reasonably acceptable to Seller and Buyer, assigning to Buyer all rights of Seller in and
to the Assumed Contracts (subject to the terms and conditions contained in such assignment and
assumption agreements);

               (iii) copies of all Seller Governmental Consents and Seller Third Party Consents;

               (iv) the certificate required under Section 10.01;

               (v) evidence of insurance coverage with terms and conditions substantially similar to those
set forth on Schedule 5.02(a); and

               (vi) that certain Secured Promissory Note dated July 31, 2004, issued by Seller to Defiante
Farmacêutica (the “Note”).

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          (b) Closing Deliveries by Buyer. At the Closing, Buyer will deliver or cause to be
delivered to Seller:

               (i) the Consideration, less the amount outstanding under the Note, in immediately available
funds by wire transfer to an account that shall have been designated by Seller (such designation to
be made not less than two Business Days prior to the Closing Date);

               (ii) an original of each of the Related Agreements, executed by Buyer, and copies of all
documents required to be delivered by Buyer pursuant to this Agreement and the Related Agreements;

               (iii) such instruments of assumption and other instruments or documents, in form and substance
reasonably acceptable to Seller and Buyer, as may be necessary to effect Buyer’s assumption of the
Assumed Liabilities;

               (iv) the certificate required under Section 9.01;

               (v) copies of all Buyer Governmental Consents and Buyer Third Party Consents (to the extent
available in writing); and

               (vi) Payment to Defiante Farmacêutica. Out of the total consideration payable by Buyer
hereunder, at Closing, Buyer will deliver to Defiante Farmacêutica on behalf of Seller and as a
credit against the consideration hereunder the amount outstanding under the Note (such amount to be
agreed by Seller and Defiante and provided to Buyer at or before Closing), in immediately available
funds by wire transfer to an account that shall have been designated by Defiante Farmacêutica (such
designation to be made not less than two Business Days prior to the Closing Date).

     Section 5.03. Payment to ISO-TEX Diagnostics, Inc. As an inducement for ISO-TEX
Diagnostics, Inc. (“ISO-TEX”), to enter into that certain Glofil Contract Manufacturing and Royalty
Agreement with Buyer, dated as of even date herewith, and as consideration for the promises and
covenants set forth therein, Seller has agreed to pay ISO-TEX a sum of three hundred and fifty
thousand dollars ($350,000) at Closing.

ARTICLE VI

REPRESENTATIONS AND WARRANTIES OF SELLER

     Seller represents and warrants to Buyer as of (i) the date hereof and (ii) the Closing Date,
except as to certain representations and warranties which expressly speak as of a date certain,
which shall speak as of such date, subject to such exceptions as are disclosed in the disclosure
schedule (that constitutes a part of this Agreement) supplied by Seller to Buyer and dated as of
the date hereof (the “Seller Disclosure Schedule”), as follows (each Seller Disclosure Schedule
shall be titled to identify it as a specific schedule referenced in this Agreement and the
disclosures on each such schedule shall relate to and modify only the specific Sections or
representations hereof that reference such individual Schedule):

     Section 6.01. Organization. Seller is duly organized, validly existing and in good
standing under the laws of California and has requisite corporate power and authority to own its
assets and

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carry on the Business as currently conducted by it. Seller is duly authorized to conduct its
business and is in good standing in each jurisdiction where such qualification is required, except
for any jurisdiction where failure to so qualify would not have a Material Adverse Effect.

     Section 6.02. Authority of Seller. Seller has all necessary corporate power and
authority and has taken all actions necessary to enter into and deliver this Agreement and the
Related Agreements and carry out the transactions contemplated hereby and thereby. The
shareholders and the board of directors of Seller have taken all action, if any, required by Law
and its Charter Documents and otherwise to be taken by it to authorize (a) the execution and
delivery of this Agreement and the Related Agreements and (b) the consummation of the transactions
contemplated hereby and thereby. This Agreement has been duly and validly executed and delivered
by Seller and, when executed and delivered by Buyer, will constitute a legal, valid and binding
obligation of Seller enforceable against it in accordance with its terms. When executed and
delivered by Seller and by Buyer, each Related Agreement will constitute a legal, valid and binding
obligation of Seller, enforceable against it in accordance with its terms.

     Section 6.03. Consents and Approvals.

          (a) Schedule 6.03(a) of the Seller Disclosure Schedule sets forth a complete and
accurate list (the “Seller Governmental Consents”) of all consents, waivers, approvals, Orders,
permits or authorizations of, or registrations, declarations, payments or filings with, any
Governmental or Regulatory Authority that are required by or with respect to Seller in connection
with the execution and delivery of this Agreement and the Related Agreements by Seller, the
transactions contemplated hereby and thereby or the performance of its obligations hereunder and
thereunder.

          (b) Schedule 6.03(b) of the Seller Disclosure Schedule sets forth a complete and
accurate list (the “Seller Third Party Consents”) of all consents, waivers, approvals, or
authorizations of, or notices to, any third party (other than a Governmental or Regulatory
Authority) that are required by or with respect to Seller in connection with the execution and
delivery of this Agreement and the Related Agreements by Seller, the transactions contemplated
hereby and thereby or the performance of its obligations hereunder and thereunder except for those
consents, waivers, approvals, authorizations or notices which a failure to obtain or make would not
have a Material Adverse Effect.

     Section 6.04. Non-Contravention. The execution and delivery by Seller of this
Agreement and the Related Agreements, does not, and the performance by it of its obligations under
this Agreement and the Related Agreements and the consummation of the transactions contemplated
hereby and thereby will not, except as would not have a Material Adverse Effect:

          (a) conflict with or result in a violation or breach of any of the terms, conditions or
provisions of the Charter Documents of Seller;

          (b) assuming the receipt of Seller Governmental Consents, conflict with or result in a
violation or breach of any term or provision of any Law applicable to Seller, the Business as
conducted by Seller or the Purchased Assets; or

          (c) conflict with or result in a Default under any Assumed Contract, assuming receipt of
required consents to the assignment of such Assumed Contract to Buyer.

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     Section 6.05. Financial Information.

          (a) Seller has made available to Buyer all financial information related to the Products, the
Purchased Assets and the Assumed Liabilities requested by Buyer, including without limitation the
attached Schedule 6.05(a) which shows for each of the last three years and the five months
ended May, 2005, units sold and gross revenues for each of the Products; the cost of the Products
sold; direct sales, distribution and other operating expenses (including separately shown
allocations of costs shared with other business of Seller); the amount of any Assumed Liabilities
that are currently capable of being reduced to a fixed dollar amount; and the units and dollar
amount by Product of all returns, discounts, rebates and charge-backs for each of the Products.
Such financial information was derived from the books and records of Seller and was prepared by
Seller in good faith and fairly presents, in all material respects, in accordance with generally
accepted accounting principles, such financial information with respect to the Products, Purchased
Assets and Assumed Liabilities as of the dates and for the periods shown. There are no discounts
or similar arrangements with insurance companies or other payors that are not included in the
information shown on Schedule 6.05(a) and in the Contracts listed on Schedule 6.08
(and for which copies of such agreements have been provided to Buyer) that affected the rebates,
discounts, chargebacks or the net revenues received by Seller for the Products.

          (b) As of June 30, 2005, the Purchased Assets accounted for 42% of Seller’s year to date
revenues through June 30, 2005 and 39% of Seller’s Product Contribution (as defined hereinafter).
Seller believes that the Purchased Assets constitute significantly less than half of the Fair
Market Value of Seller’s total assets. As of the date of this Agreement and after giving affect to
the transactions contemplated hereby, Seller’s business strategy (“Seller’s Business
Strategy”) is to focus exclusively on developing and commercializing products that treat
diseases and disorders of the central nervous system. Seller will use a substantial portion of the
net proceeds from the transactions contemplated hereby to license, acquire and develop products
that promote the Seller Business Strategy. For purposes of this Section 6.05(b), the term
“Product Contribution” shall mean: net revenues minus cost of goods sold minus specifically
identified direct product costs (such as marketing costs but excluding sales expense and corporate
overhead), as set forth on Schedule 6.05(b).

          Section 6.06. Title to Purchased Assets; Inventory, Channel. Except as set forth on
Schedule 6.06, Seller has good and valid title to all of the Purchased Assets, free and
clear of all Encumbrances other than Permitted Encumbrances. There are no contracts, agreements or
obligations of any nature that permit any third party to acquire any of the Purchased Assets (other
than inventory in the ordinary course). The identity, amounts and expiry dating of the Products
included in the Inventory are set forth in Schedule 6.06. Seller is in compliance with all
applicable legal requirements regarding the storage, sale and distribution of the Products. There
does not exist as of the date hereof, and will not exist at the time of Closing, more than two
months of supply of the Products, on an aggregate basis, in the distribution “channels” (of Seller
or its distributors or customers) for the Products (assuming sales levels consistent with the past
sales levels of the Business). All discounts, rebates, chargebacks, and returns are fully
reflected in Schedule 6.05 for the periods shown therein. The currently held ownership rights of
Seller with respect to the spray formulations of Nascobal and the rights that Seller is entitled to
acquire pursuant to the Nastech APA together represent all ownership, use and marketing rights with
respect to the Nascobal spray formulation, including all rights with respect to the applicable IND
and/or NDA, the Spray Patent Applications and any patents issued therefrom (including inchoate
inventions not yet reduced to practice).

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     Section 6.07. Regulatory Issues; 

          (a) Except as set forth on Schedule 6.07(a), during the last three (3) years prior to
the date of this Agreement, with respect to the Products, neither Seller nor any Affiliate thereof
(nor any predecessor owner of rights to the Products or the Business) has received or been subject
to: (i) any FDA Form 483’s relating to the Products, (ii) any FDA Notices of Adverse Findings
relating to the Products, or (iii) any warning letters or other written correspondence from the FDA
concerning the Products, in which the FDA asserted that the operations of Seller were not in
compliance with applicable governmental rules or guidelines with respect to the Products. All of
the Product Registrations are in full force and effect and all required information and materials
relating thereto have been submitted. The Seller is in compliance with all requirements of Code of
Federal Regulations Section 21 that are applicable to the Business and the Products.

          (b) During the last three (3) years there has not been any occurrence of any product recall,
market withdrawal or replacement, or post-sale warning conducted by or on behalf of Seller (nor any
predecessor owner of rights to the Products or the Business) concerning the Products or any product
recall, market withdrawal or replacement conducted by or on behalf of any entity as a result of any
alleged defect in the Products.

          (c) The information contained in all reports filed with the United States Food & Drug
Administration (the “FDA”) by Seller with respect to the Products and the Business is accurate and
complete in all material respects and there has been no adverse occurrence, event, effect, study,
test, article, report, investigation, or finding that was omitted from such reports, that would
require, amendment, modification, updating or supplementing of such reports, or that would require
disclosure in a future FDA report (other than current sales and distribution information). To the
Knowledge of the Seller, the previous sentence is true with respect to FDA reports filed by prior
owners of the Products.

     Section 6.08. Contracts. Schedule 6.08 of the Seller Disclosure Schedule sets
forth a complete and correct list of each Contract to which Seller or any Affiliate is a party (or
any other Contract to the Knowledge of Seller) that (x) relates to the Business or the research,
development, manufacture, marketing, sale or distribution of the Products and (y) (i) restricts or
governs in any manner the use, production, distribution, sales or marketing of the Products or
conduct of the Business, or (ii) provides for aggregate payments or has a value in excess of
$10,000. Seller has provided Buyer with complete and correct copies of all such Contracts. Each
of such Contracts is in effect and constitutes a legal, valid and binding agreement of Seller and
is enforceable in accordance with its terms; and Seller has performed all of its required
obligations under, and is not in violation or breach of or Default under, such Contract and, to the
Knowledge of Seller, the other party[ies] to all of such Contracts are not in violation or breach
of or under Default thereunder. Except for the $2,000,000.00 obligation relating to the Nastech
Asset Purchase Agreement upon satisfaction of certain conditions relating to patent issuances as
referred to in Section 3.01(a)(ii), and except as disclosed in Schedule 6.08, there are no
remaining obligations of any sort relating to the Products or the Business that are owed to the
third parties from which Seller acquired ownership of the Products, irrespective of whether such
obligations are being retained by Seller (and Buyer specifically does not assume any such
obligation).

     Section 6.09. Intellectual Property Rights. Schedule 6.09(a) contains a true
and correct list of all Trademarks (other than Excluded Intellectual Property) owned by Seller and
used by Seller in the marketing, manufacture, use, importation, sale and distribution of the
Products. Seller represents

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and warrants that it owns all rights and interests in the Purchased Intellectual Property and
has all right and power to transfer all rights, interest and title to said Purchased Intellectual
Property to Buyer pursuant hereto and that Seller has all right and authority to grant to Buyer the
license to use the Excluded Intellectual Property granted to Buyer pursuant to the provisions of
Section 2.02 above.

          (a) Except as described in Schedule 6.09(a), all of the Trademarks listed on
Schedule 6.09(a) as registered or filed have been duly registered or filed with the
appropriate Governmental or Regulatory Authorities, are owned exclusively by Seller, and are in
full force and effect. The Seller owns and has the exclusive right to use and transfer the trade
dress currently used in connection with the packaging and promotion of the Products under these
Trademarks. Except as disclosed on Schedule 6.09(a), there have been, and are, no
unresolved past or present disputes, demands, or litigation challenging the ownership by Seller or
any predecessor of any of the said marks or challenging the validity of any of the marks or the
registration thereof. Seller has taken commercially reasonable measures to protect the
confidentiality, value and secrecy of the trade secrets and Know-How of Seller in respect to the
formulation, manufacture or use of the Products, and no third party has obtained any intellectual
property rights with respect to the Purchased Intellectual Property.

          (b) Except as described in Schedule 6.09(b), to the Knowledge of Seller no third party
is infringing or misappropriating any of the Purchased Intellectual Property. No third party has
gained any rights in the Purchased Intellectual Property as a result of its infringement or
misappropriation of the Purchased Intellectual Property.

          (c) Except as set forth on Schedule 6.09(c), there are no outstanding claims asserted
in writing against Seller alleging that Seller’s (or its predecessors in the Business) development,
marketing, distribution, sale or use of the Products infringes or misappropriates any intellectual
property or other proprietary rights of any other Person, and Seller’s development, marketing,
manufacture, distribution, sale or use of the Products does not infringe or misappropriate any
intellectual property or other proprietary rights of any other Person.

          (d) Seller has not entered into any Contract (i) granting any Person the right to bring
infringement actions with respect to, or otherwise to enforce rights with respect to, any of the
Purchased Intellectual Property, or (ii) expressly agreeing to indemnify any Person against any
charge of infringement of any of the Purchased Intellectual Property.

          (e) Seller has not entered into any Contract (i) granting any Person any right of any nature
anywhere in the world with respect to the Business, the Trademarks, the Patent Rights, or the
Products other than the agreements included in the contracts listed on Schedule 6.08, or
(ii) restricting in any respect the right to sell the Products or conduct the Business anywhere in
the world. Except as disclosed in Schedule 6.08 , there are no
prior settlements, agreements, or administrative or judicial decisions affecting ownership or
validity of the assigned marks or limiting the right of the Seller or any predecessor owner to use
or register the marks or to grant this assignment.

          (f) Except as disclosed on Schedule 6.09(f), the Purchased Assets include all
intellectual property necessary for Seller to conduct the Business as currently conducted, and no
Third Party Intellectual Property is necessary for the conduct of the Business as currently
conducted.

          (g) The Product Books and Records include without limitation documents sufficient to establish
the Seller’s ownership of and complete chain of title to the Purchased

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Intellectual Property, and documents sufficient to establish the first use dates of the
Trademarks and the continuous use of the Trademarks since then until the Closing Date, and to
complete file histories for U.S. Reg Nos. 1,374,539, No. 2,623,137 and No. 2,157,683.

               (h) In its agreements with third parties, the Seller has taken reasonable measures to protect
its rights with respect to the Products throughout the United States and in substantial portions of
the world.

     Section 6.10. Litigation. There are no Orders, Actions or Proceedings pending or
threatened against, in connection with or relating to (i) the Purchased Assets or the Business as
conducted by Seller (or its predecessors in ownership of the Business or the Products), (ii) this
Agreement or any Related Agreement or (iii) the transactions contemplated by this Agreement or any
Related Agreement.

     Section 6.11. Compliance with Law.

          (a) Except as would not have a Material Adverse Effect, the Business as currently conducted by
Seller is in compliance with all applicable Laws.

          (b) Since December 31, 2001, and to the Knowledge of Seller at any time prior to such date, no
Governmental or Regulatory Authority has served notice on Seller (or its predecessors in ownership
of the Purchased Assets) that the Business as currently conducted by Seller or the Purchased Assets
were or are in violation of any Law or the subject of any investigation.

     The Seller possesses, and the Purchased Assets include, (i) all governmental legal rights,
permits and authorizations required for the conduct of the Business and the manufacture, marketing,
sale and distribution of the Products in the United States and Puerto Rico and (ii) all
governmental rights of Seller with respect to the Products in the entire world. For the avoidance
of doubt, this Section 6.11 does not relate to intellectual property rights.

     Section 6.12. No Other Assets. Except as would not have a Material Adverse Effect or
as related to the personnel of Seller involved in the Business, there are no assets (tangible or
intangible), rights or contractual relationships used by Seller primarily in, or that are
reasonably necessary for the conduct of, the Business as currently conducted or the marketing,
distribution and sale of the Products, other than those assets and rights included in the Purchased
Assets. The production of Nascobal can be done by a number of FDA licensed pharmaceutical contract
manufacturers, and does not involve proprietary knowledge that is not in the applicable NDA, Batch
Production Records or Specifications, all of which are included in the Purchased Assets. The
equipment required to produce all the Products is standard equipment used for pharmaceutical
manufacturing and available at most contract manufacturers. The Purchased Assets include all
know-how and information required for the production of the Products without the requirement of any
license or other grant of usage rights from any third party. Upon the termination of the Nastech
Supply Agreement for any reason, the Purchased Assets include all right and interests required for
the Buyer to contract with any FDA approved third party pharmaceutical manufacture for the
continued production of Nascobal Gel or Spray without the consent of any third party.

     Section 6.13. Brokers. Except as described in Schedule 6.13, Seller has no,
and will have no, obligation to pay any brokers’, finders’, investment bankers’, financial
advisors’ or similar fees in connection with this Agreement or the transactions contemplated hereby
by reason of any action

20

 

taken by or on behalf of Seller. Seller shall be solely responsible for all brokers’ and
finders’ fees and for the fees of any investment bankers, financial advisors or similar third
parties employed by or which provide services to Seller.

     Section 6.14. Customers and Suppliers. Seller has made available to Buyer the names
of the customers that were, in the aggregate, the ten (10) largest wholesale customers in terms of
dollar value of the Products sold by the Business as conducted by Seller for each of the fiscal
years ended December 31, 2003 and December 31, 2004. None of such customers has given Seller
notice, and to the Knowledge of Seller none is considering, terminating, canceling or threatening
to terminate or cancel any Contract or relationship with Seller relating to the Business as
conducted by Seller. Seller has made available to Buyer the names of the suppliers of the active
pharmaceutical ingredients in the Products for each of the fiscal years ended December 31, 2003 and
December 31, 2004. None of such suppliers has given Seller notice, and to the Knowledge of Seller
none is considering, terminating, canceling or threatening to terminate or cancel any Contract or
relationship with Seller relating to the Business as conducted by Seller. There are no contracts
and agreements of any nature (other than open accounts receivable and accounts payable for sales or
purchases that are not in default) between the Seller and any customer or supplier of the Business
or the Products that are not included in the Contracts and listed on Schedule 6.08.

     Section 6.15. Marketing Rights. Seller has not granted marketing, distribution or
other rights relating to the sale, marketing or distribution of any Product anywhere in the world
to any person. or entity.

     Section 6.16. Absence of Changes. Since December 31, 2004, Seller has operated the
Business in the ordinary course and there has been no adverse change in the Business or the
Purchased Assets, except for changes that have no Material Adverse Effect. To the Knowledge of
Seller, there are no facts or circumstances relating to the Products or the Business, and not
generally applicable in the pharmaceutical business or the portion thereof relating to the
Products, that cause Seller to reasonably believe there will be a significant decline in the sales
of any of the Products in the next year.

     Section 6.17. Related Party Relationships. Except as set forth in
Schedule 6.17, no shareholder or any officer or director of the Seller, possesses, directly
or indirectly, any beneficial interest in, or is a director, officer or employee of, any
corporation, partnership, firm, association or business organization which is a supplier,
contractor or customer of the Seller (except as a stockholder holding less than a one percent
interest in a corporation whose shares are traded on a national or regional securities exchange or
in the over-the-counter market).

     Section 6.18. Disclosure. No representation or statement contained herein or in any
certificate, schedule, list, exhibit or other instrument furnished to Buyer pursuant to the
provisions hereof contains or will contain any untrue statement of any material fact or omits or
will omit to state a material fact necessary in order to make the statements contained herein or
therein not misleading.

     Section 6.19. No Other Warranties. EXCEPT FOR THE REPRESENTATIONS AND WARRANTIES
EXPRESSLY SET FORTH IN THIS AGREEMENT, SELLER DISCLAIMS ALL OTHER REPRESENTATIONS AND WARRANTIES,
EXPRESS OR IMPLIED, WITH REGARD TO THE PURCHASED ASSETS AND THE BUSINESS. IN ADDITION, SELLER
EXPRESSLY DISCLAIMS ALL REPRESENTATIONS AND WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD TO THE
OTHER POTENTIAL PATENT RIGHTS.

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ARTICLE VII

REPRESENTATIONS AND WARRANTIES OF BUYER

     Buyer represents and warrants to Seller as of (i) the date hereof and (ii) the Closing Date,
except as to certain representations and warranties which expressly speak as of a date certain,
which shall speak as of such date, subject to such exceptions as are disclosed in the disclosure
schedule supplied by Buyer to Seller, attached hereto, and dated as of the date hereof (the “Buyer
Disclosure Schedule”), as follows (each Buyer Disclosure Schedule shall be titled to identify it as
a specific schedule referenced in this Agreement and the disclosures on each such schedule shall
relate to and modify only the specific Sections or representations hereof that reference such
individual Schedule):

     Section 7.01. Organization. Buyer is duly organized, validly existing and in good
standing under the laws of Delaware and has all requisite limited liability company power and
authority to own its assets and carry on its business as currently conducted. Buyer is duly
authorized to conduct its business and is in good standing in each jurisdiction where such
qualification is required, except for any jurisdiction where failure to so qualify would not have a
Buyer Adverse Effect.

     Section 7.02. Authority of Buyer. Buyer has all necessary power and authority and has
taken all actions necessary to enter into and deliver this Agreement and the Related Agreements and
carry out the transactions contemplated hereby and thereby. The members and managers of Buyer have
taken all action required by Law and its Charter Documents and otherwise to be taken by it to
authorize (a) the execution and delivery of this Agreement and the Related Agreements and (b) the
consummation of the transactions contemplated hereby and thereby. This Agreement has been duly and
validly executed and delivered by Buyer and, when executed and delivered by Seller, will constitute
a legal, valid and binding obligation of Buyer, enforceable against it in accordance with its
terms. When executed and delivered by Buyer and by Seller, each Related Agreement will constitute
a legal, valid and binding obligation of Buyer, enforceable against it in accordance with its
terms.

     Section 7.03. Consents and Approvals.

          (a) Schedule 7.03(a) of the Buyer Disclosure Schedule sets forth a complete and
accurate list (the “Buyer Governmental Consents”) of all consents, waivers, approvals, Orders,
permits or authorizations of, or registrations, declarations, payments or filings with, any
Governmental or Regulatory Authority that are required by or with respect to Buyer in connection
with the execution and delivery of this Agreement and the Related Agreements by Buyer, the
transactions contemplated hereby and thereby or the performance of its obligations hereunder and
thereunder.

          (b) Schedule 7.03(b) of the Buyer Disclosure Schedule sets forth a complete and
accurate list (the “Buyer Third Party Consents”) of all consents, waivers, approvals, or
authorizations of, or notices to, any third party (other than a Governmental or Regulatory
Authority) that are required by or with respect to Buyer in connection with the execution and
delivery of this Agreement and the Related Agreements by Buyer, the transactions contemplated
hereby and thereby or the performance of its obligations hereunder and thereunder, except for those
consents, waivers, approvals, authorizations or notices which a failure to obtain or make would not
have a Buyer Adverse Effect.

22

 

     Section 7.04. Non-Contravention. The execution and delivery by Buyer of this
Agreement, and the Related Agreements, does not, and the performance by it of its obligations under
this Agreement and the Related Agreements and the consummation of the transactions contemplated
hereby and thereby will not, except as would not have a Buyer Adverse Effect:

          (a) conflict with or result in a violation or breach of any of the terms, conditions or
provisions of the Charter Documents of Buyer;

          (b) assuming the receipt of all Buyer Governmental Consents, conflict with or result in a
violation or breach of any term or provision of any Law applicable to Buyer; or

          (c) conflict with or result in a Default under any Contract to which Buyer is a party or by
which Buyer or any of its assets are bound.

     Section 7.05. Litigation. There are no Orders, Actions or Proceedings pending, or to
the Knowledge of Buyer, threatened, against, in connection with or relating to (i) this Agreement
or any Related Agreement, or (ii) the transactions contemplated by this Agreement or any Related
Agreement.

     Section 7.06. Brokers. Except as described in Schedule 7.06, Buyer has no,
and will have no, obligation to pay any brokers’, finders’, investment bankers’, financial
advisors’ or similar fees in connection with this Agreement or the transactions contemplated hereby
by reason of any action taken by or on behalf of Buyer. Buyer shall be solely responsible for all
fees of any investment bankers, financial advisors or similar third parties employed by Buyer.

     Section 7.07. Disclosure. No representation or statement contained herein or in any
certificate, schedule, list, exhibit or other instrument furnished to Seller pursuant to the
provisions hereof contains or will contain any untrue statement of any material fact or omits or
will omit to state a material fact necessary in order to make the statements contained herein or
therein not misleading.

     Section 7.08. No Other Warranties. EXCEPT FOR THE WARRANTIES EXPRESSLY SET FORTH IN
THIS AGREEMENT, BUYER DISCLAIMS ALL OTHER REPRESENTATIONS AND WARRANTIES, EXPRESS OR IMPLIED, WITH
REGARD TO THE SUBJECT MATTER OF THIS AGREEMENT.

ARTICLE VIII

COVENANTS OF THE PARTIES

     Section 8.01. Operation of the Business by Seller. Between the date of this Agreement
and the Closing Date, except as contemplated by this Agreement, Seller shall:

          (a) conduct the Business in substantially the same manner as conducted in the last year;

          (b) not sell, lease, transfer, or grant any rights or interests in or with respect to, or
agree to sell, lease, transfer, or grant any rights in or with respect to, any of the Purchased
Assets;

          (c) use its commercially reasonable efforts to maintain intact the Business as it is currently
conducted by Seller, to maintain its relations with suppliers and customers, in each case

23

 

having a relationship with the Business, and to maintain all rights and interests with respect
to the Purchased Assets (including any intellectual property rights related thereto) intact and in
full force and effect;

          (d) confer with Buyer prior to implementing material operational decisions relating to the
Business as conducted by Seller;

          (e) keep in full force and effect, without amendment, all material rights relating to the
Products and Business as conducted by Seller;

          (f) comply with all requirements of Law and contractual obligations, in each case applicable
to the Products or the operation of the Business as conducted by Seller; and

          (g) maintain all Product Books and Records.

     Section 8.02. Commercially Reasonable Efforts. Following the date hereof, each of the
parties hereto shall use its commercially reasonable efforts to take, or cause to be taken, all
action, or to do, or cause to be done, all things necessary, proper or advisable under applicable
Laws to consummate and make effective the transactions contemplated by this Agreement and the
Related Agreements and to cause the conditions to the obligations of the other party hereto to
consummate the transactions contemplated hereby and thereby to be satisfied at the Closing,
including obtaining all Seller Third Party Consents, Seller Governmental Consents, Buyer Third
Party Consents and Buyer Governmental Consents and removing any injunctions or other Encumbrances,
other than Permitted Encumbrances, on the Purchased Assets and any impairments or delays obtaining
or removal of which are necessary, proper or advisable to the consummation of the transactions
contemplated by this Agreement and the Related Agreements.

     Section 8.03. Access.

          (a) In order to facilitate the resolution of any claims made by or against or incurred by
Seller or any of its Affiliates or any of their respective officers or directors in any Seller
Companies Proceeding, upon reasonable notice, Buyer shall: (i) afford the officers, employees and
authorized agents and representatives of Seller or any of its Affiliates reasonable access
(including the right to make copies at their own expense), during normal business hours, to the
offices and properties of Buyer to the extent required for reasonable access to the Product Books
and Records; (ii) furnish to the officers, employees and authorized agents and representatives of
Seller or any of its Affiliates such additional financial and other information regarding the
Business as conducted by Seller relating to the period prior to the Closing as Seller or any of its
Affiliates may from time to time reasonably request; (iii) make available to the officers,
employees and authorized agents and representatives of Seller or any of its Affiliates the
employees of Buyer whose assistance, testimony or presence is necessary to assist Seller or any of
its Affiliates in evaluating any such claims and/or in prosecuting or defending against such
claims, including the presence of such persons as witnesses in hearings or trials for such
purposes; and (iv) to the extent that Seller or any of its Affiliates or any of their respective
officers of directors is legally required to produce original documents included among the
Purchased Assets for inspection in any legal Action or Proceeding, cooperate with Seller or any of
its Affiliates or any of their respective officers or directors in making such original documents
available for inspection by parties to such Action or Proceeding; provided, however, that the
foregoing shall not unreasonably interfere with the business or operations of Buyer or cause Buyer
unreasonable expense. Notwithstanding the foregoing, the provisions of this Section 8.03(a)

24

 

shall not apply to any claims made by a party hereto, or any of its respective Affiliates
against the other party hereto or any of its respective Affiliates.

          (b) In order to facilitate the resolution of any claims made by or against or incurred by
Buyer or any of its Affiliates or any of their respective officers or directors in any Buyer
Proceeding, upon reasonable notice and to the extent Seller has records or information not included
in the Purchased Assets, Seller shall: (i) afford the officers, employees and authorized agents
and representatives of Buyer or any of its Affiliates reasonable access (including the right to
make copies at their own expense), during normal business hours, to the offices and properties of
Seller to the extent required for reasonable access to the Books and Records that relate to the
subject matter or defense or prosecution of the Buyer Proceeding; (ii) furnish to the officers,
employees and authorized agents and representatives of Buyer or any of its Affiliates such
additional financial and other information regarding the Business as conducted by Seller relating
to the period prior to the Closing as Buyer or any of its Affiliates may from time to time
reasonably request; (iii) make available to the officers, employees and authorized agents and
representatives of Buyer or any of its Affiliates the employees of Seller whose assistance,
testimony or presence is necessary to assist Buyer or any of its Affiliates in evaluating any such
claims and/or in prosecuting or defending against such claims, including the presence of such
persons as witnesses in hearings or trials for such purposes; and (iv) to the extent that Buyer or
any of its Affiliates or any of their respective officers of directors is legally required to
produce original documents in the possession of Seller not included among the Purchased Assets for
inspection in any legal Action or Proceeding, cooperate with Buyer or any of its Affiliates or any
of their respective officers or directors in making such original documents available for
inspection by parties to such Action or Proceeding; provided, however, that the foregoing shall not
unreasonably interfere with the business or operations of Seller. Notwithstanding the foregoing,
the provisions of this Section 8.03(b) shall not apply to any claims made by a party hereto or any
of its respective Affiliates against the other party hereto, or any of its respective Affiliates.

          (c) Each of Buyer and Seller agrees to make its respective personnel reasonably available to
the other party or its representatives to the extent such access is reasonably related to the
Business or any Purchased Asset, or is otherwise reasonably necessary to comply with the terms of
this Agreement or to comply with any applicable Law, it being understood that the party requesting
access shall reimburse the other party promptly for its reasonable and necessary out-of-pocket
expenses incurred in complying with any such request.

          (d) Buyer agrees to use reasonable efforts to maintain all of the Product Books and Records
for a period of ten (10) years after the Closing Date. After such ten (10) year period, before
Buyer shall dispose of any Product Books and Records, it shall provide to Seller at least ninety
(90) calendar days’ prior written notice to such effect, and Seller shall be given an opportunity,
at its sole cost and expense, to remove and retain all or any part of such Product Books and
Records.

     Section 8.04. Public Announcements; Confidentiality.

          (a) Each of Buyer and Seller shall to the extent reasonably practicable consult with each
other before issuing, and provide each other a reasonable opportunity to review and comment upon,
any press release or other public statements with respect to this Agreement, the Related Agreements
and the transactions contemplated hereby and thereby, and shall not issue any such press release or
make any such public statement prior to such consultation, except as may be

25

 

required by applicable law, by court process or by obligations pursuant to any listing
agreement with any national securities exchange.

          (b) Each party shall not, and shall require that its Affiliates and its and their advisors and
distributors do not, use or reveal or disclose to third parties any Confidential Information of the
other party obtained in connection herewith without first obtaining the written consent of the
other party, except as may be reasonably necessary in performing such party’s obligations or
exercising such party’s rights under this Agreement. Notwithstanding the foregoing, each party may
disclose any Confidential Information to its Affiliates and its and their advisors, accountants,
attorneys, consultants and agents on a need-to-know basis only, and such party shall be responsible
for such Persons’ compliance with the provisions of this paragraph with respect thereto. Each
party shall take, and shall require its Affiliates and its and their advisors, accountants,
attorneys, consultants and agents to take, reasonable steps to prevent any unauthorized use or
disclosure of any Confidential Information of the other party. The foregoing obligations in this
Section 8.04(b) shall not apply to information which (i) is or becomes a matter of public knowledge
through no fault of a party or any Person to whom such party provided such information, (ii) is
reasonably required to be disclosed in connection with obtaining or maintaining Nascobal Patent
Rights and other patent rights or regulatory approvals for the Products, or (iii) is required by
Law or any Governmental or Regulatory Authority to be disclosed, provided that for disclosures
under subclauses (ii) and (iii) the disclosing party uses reasonable efforts to give the other
party advance written Notice of such required disclosure in sufficient time to enable the other
party to seek confidential treatment for such information; and provided, further, that such
disclosing party limits the disclosure to that information which is required to be disclosed. As
used herein, “Confidential Information” means all Know-How and any proprietary or trade secret
information or data relating to the Products or such other information that either party identifies
to the other in writing as confidential or the nature of which or the circumstances of the
disclosure of which would reasonably indicate that such information is confidential. After the
Closing, such transferred Know-How and information shall be deemed Confidential Information of
Buyer and Seller shall maintain the confidentiality thereof in accordance with this Section 8.04.

          (c) From and after the date hereof until the Closing Date, the provisions of the
confidentiality agreement dated as of May 2, 2005 between Seller and Buyer (the “Confidentiality
Agreement”) shall apply to any information disclosed to Buyer pursuant to this Agreement or any
Related Agreement, or otherwise in connection with the transactions contemplated hereby or thereby.
Following the Closing, the Confidentiality Agreement will terminate in its entirety, with no
further obligation on the part of any party thereto. In addition, the transactions contemplated by
this Agreement and the Related Agreements shall not constitute a breach or violation of the terms
of the Confidentiality Agreement.

     Section 8.05. Returns, Rebates and Chargebacks.

          (a) (i) Buyer shall not use Seller’s name or NDC number in connection with the sale of the
Products after the Closing, and agrees to overlabel the Products with new labels containing Buyer’s
NDC number prior to selling any Products after the Closing. Seller shall be financially
responsible for all returns, rebates and chargebacks that relate to the Products sold prior to
Closing and for any returns that relate to defects in Products included in the Inventory purchased
by Buyer pursuant to this Agreement. Buyer shall be financially responsible for returns, rebates
and chargebacks relating to Products sold following Closing, except for any returns that relate to
defects in Products included in the Inventory purchased by Buyer pursuant to this Agreement.

26

 

Notwithstanding the foregoing, Buyer shall be financially responsible for any returns that
relate to Products sold prior to the Closing if such returns are received after January 31, 2006.

               (ii) Seller and Buyer will use commercially reasonable efforts in requesting that customers
direct all Product returns after the Closing to Buyer. All returned Products received by Seller or
Buyer after the Closing will be destroyed by such party, after documentation. For Products
returned to Seller at any time after the Closing and for Products returned to Buyer after Closing
that are the responsibility of Seller, the destructing party will forward to the other party any
necessary accompanying documentation to determine the financially responsible party pursuant to
Section 8.05(a)(i) and to assist both parties in compliance with any recordkeeping and/or reporting
obligations. If Seller destroys Products for which Buyer was financially responsible, Seller shall
bill Buyer for the cost of the destruction. If Buyer destroys Products for which Seller was
financially responsible, Buyer shall bill Seller for the cost of the destruction. Each such
invoice shall set forth the number of units processed, together with such other information as
shall be necessary to support the invoice and to assist both parties in compliance with any
recordkeeping and/or reporting obligations. Buyer and Seller shall, within thirty (30) days of its
receipt of invoice, pay the other party for the full invoiced amount of such costs. The party
financially responsible pursuant to Section 8.05(a)(i) for any returned Product shall have the
responsibility for issuing a proper credit to the returning customers, or otherwise properly
compensating such customers. For purposes of this Section 8.05(a)(ii), the dollar value of
returned Products paid or credited for by Seller or Buyer, as applicable, shall be determined in
accordance with such party’s then current returned goods policy.

               (iii) Prior to January 31, 2006, Buyer covenants and agrees (i) not to solicit returns of any
Product that is the financial responsibility of Seller from any wholesaler of such Product and (ii)
not to provide any incentive to wholesalers of the Products to return any Product sold prior to the
Closing.

          (b) Seller shall process and be financially responsible for all chargeback claims and related
administrative service fees for the Products with a chargeback invoice dated (i.e., the date of
sale from the wholesaler to the wholesaler customer, subsequently referred to as the “Activity
Date”) prior to the Closing Date. Buyer shall process and be financially liable for all chargeback
claims and related administrative service fees with an Activity Date subsequent to such date.
Notwithstanding the foregoing, the parties acknowledge that the VA National Acquisition Center must
approve the removal of the Products from Seller’s Federal Supply Schedule (“FSS”) before the
responsibility of processing such chargebacks is transferred from Seller to Buyer. Accordingly, in
the event such approval is not obtained prior to the Closing Date, Seller shall continue to be
responsible for processing the FSS chargebacks and related administrative service fees on Buyer’s
behalf, and Buyer shall reimburse Seller for same within thirty (30) days of receipt of invoices
that describe the requested payments in reasonable detail. Buyer and Seller agree that (a)
Seller’s financial liability for such transition chargebacks and related administrative service
fees shall be limited to those commercial customers with which Seller has chargeback obligations as
of the Closing, and (b) any such chargebacks and related administrative service fees issued by
Seller shall be made on the terms and conditions comparable to Seller’s chargeback obligations as
of the Closing with respect to each such commercial customer and shall be based on the terms of
Seller’s agreement with such customer as of the Closing. Buyer and Seller agree that Seller’s
financial liability for processing and administrating chargeback claims and related administrative
service fees shall terminate on the date that is thirty (30) days after the Closing Date. To the
extent that Seller is required to process or administrate any such matters, Buyer shall, within
thirty (30) days of its receipt

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of an invoice from Seller setting forth Seller’s reasonable costs relating thereto, pay Seller
for the full invoiced amount.

     Section 8.06. Multi-Product Contracts. Schedule 8.06 of the Seller Disclosure
Schedule sets forth a complete and correct list of each Contract to which Seller is a party and
pursuant to which Seller sells any of the Products, together with other pharmaceutical products of
Seller, to a third party (the “Multi-Product Contracts”). Seller has made available to Buyer
copies of all Multi-Product Contracts; provided, that such copies may have been redacted only to
prevent disclosure of information not related to any of the Products or the Business. From and
after the Closing Date, (i) Buyer shall honor and perform the Product delivery obligations of
Seller under and pursuant to each Multi-Product Contract with respect only to supplying the
Products to the applicable third party after the Closing Date and (ii) Seller shall honor and
perform the administrative obligation of processing and issuing chargeback claims and related
administrative service fees applicable to the Products sold by Buyer after Closing under and
pursuant to the Multi-Product Contracts, both until such time as Seller has terminated each such
Multi-Product Contract. Buyer shall be entitled to all proceeds of sales of Products made pursuant
to the Multi-Product Contracts after the Closing Date. Seller agrees that after the date hereof it
will not take any action with respect to any Multi-Product Contract that would extend the term of
such Multi-Product Contract with respect to the Products, fail to take any action with respect to
any Multi-Product Contract that would terminate such Multi-Product Contract with respect to the
Products, create or agree to any additional obligations with respect to the Products, including
entering into any new Multi-Product Contracts that include the sale of Product, or otherwise
adversely affect Buyer, without the prior written consent of Buyer, although Seller may enter into
separate agreements with such third parties that do not contain any provisions relating to the
Products.

     Section 8.07. Bulk Transfer Laws. Buyer hereby waives compliance by Seller with the
provisions of any so-called “bulk transfer law” of any jurisdiction in connection with the sale of
the Purchased Assets to Buyer.

     Section 8.08. Further Assurances.

          (a) On and after the Closing Date, Seller shall, from time to time, at the request of Buyer,
execute and deliver, or cause to be executed and delivered, such other instruments of conveyance
and transfer and take such other actions as Buyer may reasonably request, in order to more
effectively consummate the transactions contemplated hereby and in the Related Agreements and to
vest in Buyer good and marketable title to the Purchased Assets (including assistance in the
collection or reduction to possession of any of the Purchased Assets). Without limiting the
generality of the foregoing, Seller agrees that, in the event it transfers any technology or
intellectual property related to the Products, it will, as a condition to any such transfer, obtain
the agreement from any such transferee that such transferee will not import or otherwise sell or
transfer any products based on or containing such technology or intellectual property.

          (b) On and after the Closing Date, Buyer shall, from time to time, at the request of Seller,
take such actions as Seller may reasonably request, in order to more effectively consummate the
transactions contemplated hereby and in the Related Agreements, including Buyer’s assumption of the
Assumed Liabilities to the limited extent provided herein.

     Section 8.09. No Solicitation. Seller and its Affiliates, officers, directors,
representatives shall immediately cease any discussions or negotiations with any parties with
respect to any Third

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Party Acquisition Proposal. Seller also agrees promptly to request each person that has
heretofore executed a confidentiality agreement in connection with its consideration of acquiring
(whether by merger, acquisition of stock or assets or otherwise) all or part of the Purchased
Assets, if any, to return all confidential information heretofore furnished to such person by or on
behalf of Seller and, if requested by Buyer, to enforce such person’s obligation to do so. Neither
Seller nor its Affiliates shall, and neither Seller nor its Affiliates shall authorize or permit
any of their respective officers, directors or representatives to, directly or indirectly,
encourage, solicit, participate in, continue, or initiate discussions or negotiations with or
provide any information to or enter into any agreement with any person or group (other than Buyer
or any designees of Buyer) concerning any Third Party Acquisition Proposal.

     Section 8.10. Insurance. For a period of three (3) years following the Closing,
Seller will maintain insurance policies covering the conduct of the Business prior to the Closing,
including but not limited to product liability insurance relating to the Products sold by Seller
(collectively, the “Seller Insurance Policies”), which are of the type and in amounts customarily
carried by Persons conducting businesses similar to the Business, or Seller will put in place
substantially equivalent “tail” coverage and maintain it for at least three (3) years following the
Closing.

     Section 8.11. Post-Closing Assistance. Following Closing, Seller shall forward all
inquiries regarding purchasing the Products from current or potential customers of the Business
that it receives to the Buyer and provide such third parties with the names and contact information
of Buyer customer representatives provided to Seller by Buyer at or following the Closing. Seller
shall provide reasonable assistance to Buyer in alerting current or potential customers of the
Business of the change in Product provider, including issuance of written notices to current
customers, and FDA informing them of the change.

     Section 8.12. Special Obligation Regarding Materiality Qualifications. Certain of
the representations and warranties of the parties contained in Articles Six and Seven of this
Agreement are qualified by references such as “Material Adverse Effect,” “Buyer Adverse Effect” or
other materiality limitations. It is the specific intent of the parties that such provisions shall
not affect the obligations of the parties with respect to the representations and warranties.
Therefore, Seller covenants and agrees that if a representation or warranty of Seller would have
been a misrepresentation or false or would have been breached or in breach by an event,
circumstance, occurrence or state of facts if the representation or warranty had not been qualified
by the materiality reference, then Buyer and the Buyer Indemnitees shall be entitled to indemnity
under Section 11.02(a) hereof as fully and completely as if the materiality qualifier were not
included in the representation. Similarly, Buyer covenants and agrees that if a representation or
warranty of Buyer would have been a misrepresentation or false or would have been breached by an
event, circumstance, occurrence or state of facts if the representation or warranty had not been
qualified by the materiality reference, then Seller and the Seller Indemnitees shall be entitled to
indemnity under Section 11.02(b) hereof as fully and completely as if the materiality qualifier
were not included in the representation.

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ARTICLE IX

CONDITIONS TO THE OBLIGATIONS OF SELLER FOR THE CLOSING

     The obligation of Seller to effect the Closing is subject to the satisfaction (or waiver by
Seller), at or before the Closing, of each of the following conditions:

     Section 9.01. Representations, Warranties and Covenants. Each representation and
warranty of Buyer contained in this Agreement or any Related Agreement (i) which is not qualified
by Buyer Adverse Effect shall be true and correct except as will not have a Buyer Adverse Effect
and (ii) which is qualified by Buyer Adverse Effect shall be true in all respects, in each case on
and as of the Closing Date as though given on and as of such date (or, in the case of each
representation and warranty which expressly speaks as of an earlier date, as of the earlier date as
of which such representation and warranty speaks), and Buyer shall have performed in all material
respects all agreements and covenants required by this Agreement or any Related Agreement to be
performed by it prior to or on the Closing Date, and Seller shall have received a certificate to
such effect dated the Closing Date and executed by a duly authorized officer of Buyer. (The
foregoing language in this paragraph modifying representations, warranties or obligations for
purposes of Closing by reference to “Buyer Adverse Effect” or “in all material respects” shall be
solely with respect to satisfaction of the conditions to Closing and shall not in any respect
modify the underlying representations, warranties or covenants or the rights of Seller with respect
thereto, such that even if the Closing occurs, Seller shall retain all rights to seek
indemnification or other equitable remedies relating to or resulting from the failure of such
representations or warranties as unmodified to be true and accurate or such obligation as
unmodified to be fully performed.)

     Section 9.02. No Actions or Proceedings. No Orders prohibiting the transactions
contemplated by this Agreement or the Related Agreements shall have been instituted and not settled
or otherwise terminated. No Law shall have been enacted, entered, promulgated or enforced by any
Governmental or Regulatory Authority that is in effect and has the effect of making the purchase
and sale of the Purchased Assets illegal or otherwise prohibiting the consummation of such purchase
and sale or the other transactions contemplated by this Agreement or the Related Agreements.

     Section 9.03. Consents. All Buyer Governmental Consents and Buyer Third Party
Consents shall have been obtained or made, as the case may be.

     Section 9.04. Related Agreements and Nastech Clarification Amendment. The other
parties thereto shall have executed and delivered to Seller all of the Related Agreements. Nastech
shall have executed and delivered to Buyer that certain agreement to be entered into effective as
of the date hereof between Nastech and Buyer for the purposes of clarification and modifications of
certain terms of the Nastech Agreement and the Nastech Supply Agreement, executed by Nastech (the
“Nastech Clarification Agreement”).

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ARTICLE X

CONDITIONS TO THE OBLIGATIONS OF BUYER FOR THE CLOSING

     The obligation of Buyer to effect the Closing is subject to the satisfaction (or waiver by
Buyer), at or before the Closing, of each of the following conditions:

     Section 10.01. Representations, Warranties and Covenants. Each representation and
warranty of Seller contained in this Agreement or any Related Agreement (i) which is not qualified
by Material Adverse Effect shall be true and correct except as will not have a Material Adverse
Effect and (ii) which is qualified by Material Adverse Effect shall be true in all respects, in
each case on and as of the Closing Date as though given on and as of such date (or, in the case of
each representation and warranty which expressly speaks as of an earlier date, as of the earlier
date as of which such representation and warranty speaks), and Seller shall have performed in all
material respects all agreements and covenants required by this Agreement or any Related Agreement
to be performed by it prior to or on the Closing Date, and Buyer shall have received a certificate
to such effect dated the Closing Date and executed by a duly authorized officer of Seller. (The
foregoing language in this paragraph modifying representations, warranties or obligations for
purposes of Closing by reference to “Material Adverse Effect” or “in all material respects” shall
be solely with respect to satisfaction of the conditions to Closing and shall not in any respect
modify the underlying representations, warranties or covenants or the rights of Buyer with respect
thereto, such that even if the Closing occurs, Buyer shall retain all rights to seek
indemnification or other equitable remedies relating to or resulting from the failure of such
representations or warranties as unmodified to be true and accurate or such obligation as
unmodified to be fully performed.)

     Section 10.02. No Actions or Proceedings. No Orders prohibiting the transactions
contemplated by this Agreement or the Related Agreements shall have been instituted and not settled
or otherwise terminated. No Law shall have been enacted, entered, promulgated or enforced by any
Governmental or Regulatory Authority that is in effect and has the effect of making the purchase
and sale of the Purchased Assets illegal or otherwise prohibiting the consummation of such purchase
and sale or the other transactions contemplated by this Agreement or the Related Agreements.

     Section 10.03. Consents. All Seller Governmental Consents and Seller Third Party
Consents shall have been obtained or made, as the case may be.

     Section 10.04. Related Agreements. The other parties thereto shall have executed and
delivered to Buyer all of the Related Agreements.

     Section 10.05. Absence of Material Adverse Effects. There shall have been no change
in the Business, financial condition, or results of operations of the Seller since December 31,
2004, which has had a Material Adverse Effect or reasonably could be expected to have a Material
Adverse Effect.

ARTICLE XI

INDEMNIFICATION

     Section 11.01. Survival of Representations, Warranties, Covenants, Etc. The
representations and warranties and covenants and agreements of Seller or Buyer contained in this
Agreement shall survive Closing and terminate 18 months following the Closing Date (except for (i)
the

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representations and warranties contained in Sections 6.07(c) and 6.10, all of which shall
survive for a period of four (4) years from Closing, (ii) the representations and warranties
contained in Sections 6.01, 6.06, 6.07(a), 6.07(b), 6.09, 7.01 and 7.02, all of which shall survive
until expiration of the applicable statute of limitations, (iii) the representations and warranties
contained in Sections 6.02 and 6.05(b) shall survive without limitation, irrespective of the time
following Closing that elapses before a claim may arise, and (iv) the obligations undertaken in the
covenants contained herein which by their terms provide for a longer period of time (such as
Section 2.04), which covenants shall survive for the respective periods provided in this
Agreement). So long as an Indemnified Party gives an Indemnification Claim Notice for such a claim
on or before the applicable expiration date, such Indemnified Party shall be entitled to pursue its
rights to indemnification with respect to such claim.

     Section 11.02. Indemnification.

          (a) By Seller. Subject to Sections 11.01 and 11.03, from and after the Closing,
Seller shall indemnify, reimburse, defend and hold harmless Buyer, its Affiliates and owners (other
than any of its members and lenders in their capacities as such) and their respective officers,
directors, employees, agents, successors and assigns (collectively, the “Buyer Indemnitees”) from
and against any and all losses, damages, fines, penalties, judgments, lawsuits, deficiencies,
claims, expenses, and out-of-pocket costs, (including reasonable fees and disbursements of
attorneys and other professionals, including third-party consultants and, to the extent allowable
at Law, medical monitoring costs and expenses) of every kind and nature (collectively, “Damages”)
incurred in connection with, arising out of, resulting from or incident to (i) any breach of a
representation or warranty of Seller made in this Agreement or any Related Agreement, (ii) any
breach of any covenant or agreement of Seller in this Agreement or any Related Agreement, (iii) any
Excluded Liabilities, and (iv) the conduct of the Business and/or the use of the Purchased Assets
prior to the Closing. For purposes of determining whether a representation or warranty of Seller
has been breached, and the amount of any Damages attributable to any such breach, such
determinations shall be made without giving any effect to any materiality qualifications in the
representations and warranties including without limitation references to “Material Adverse Effect”
or “in all material respects,” and all such materiality qualifications shall be disregarded. In
other words, it is the specific and expressed intent of the parties that if a representation or
warranty of Seller contained in this Agreement that is modified by Material Adverse Effect or words
of similar effect would have been untrue or breached by or due to an occurrence, event or
circumstance if such representation or warranty were not so qualified, then because all such
materiality qualifications are disregarded for purposes of indemnification, the representation or
warranty shall be deem to have been breached and Buyer shall be entitled to indemnification
pursuant to this Section 11.02(a). For purposes of clarification, the modification of Affiliates
and owners contained in the parenthetical on the second and third line of this Section 11.02(a) is
intended to provide that the indemnification hereunder are not intended to extend to claims by a
member or lender of Buyer for indirect damages resulting from Damages incurred by Buyer due to a
misrepresentation or breach by Seller to the extent that such member or lender is affected solely
because of their investment in or loan to the Buyer (such as diminished value of the member’s
investment in Buyer or a higher risk of collection of a loan for the lender, respectively) because
these items are the subject of indemnification of Buyer by Seller hereunder; provided however, the
members or lenders of Buyer shall be entitled to indemnification hereunder for Damages they
directly incur due to a misrepresentation or breach by Seller (such as being named in a Third Party
Claim).

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          (b) By Buyer. Subject to Sections 11.01 and 11.03, from and after the Closing, Buyer
shall indemnify, reimburse, defend and hold harmless Seller, its Affiliates and owners (other than
any of its shareholders and lenders in their capacities as such) and their respective officers,
directors, employees, agents, successors and assigns (collectively, the “Seller Indemnitees”) from
and against any and all Damages incurred in connection with, arising out of, resulting from or
incident to (i) any breach of a representation or warranty of Buyer made in this Agreement or any
Related Agreement, (ii) any breach of any covenant or agreement of Buyer in this Agreement or any
Related Agreement, (iii) any Assumed Liabilities, and (iv) the conduct of the Business and/or the
use of the Purchased Assets by Buyer or its successors and assigns after the Closing, unless such
conduct or use, or the matter giving rise to the claim, relates to a breach of a representation,
warranty or covenant of Seller hereunder or is subject to indemnification by Seller under Section
11.02(a) (or would be subject but for the expiration of indemnities under Section 11.01 or the
effect of the Buyer Deductible or the Buyer Cap). For purposes of determining whether a
representation or warranty of Buyer has been breached, and the amount of any Damages attributable
to any such breach, such determinations shall be made without giving any effect to any materiality
qualifications in the representations and warranties including without limitation references to
“Buyer Adverse Effect” or “in all material respects,” and all such materiality qualifications shall
be disregarded. In other words, it is the specific and expressed intent of the parties that if a
representation or warranty of Buyer contained in this Agreement that is modified by Buyer Adverse
Effect or words of similar effect would have been breached by or due to an occurrence, event or
circumstance if such representation or warranty were not so qualified, then because all such
materiality qualifications are disregarded, the representation or warranty shall be deemed to have
been breached and Seller shall be entitled to indemnification pursuant to this Section 11.02(b).
For purposes of clarification, the modification of Affiliates and owners contained in the
parenthetical on the second and third line of this Section 11.02(b) is intended to provide that the
indemnification hereunder are not intended to extend to claims by a member or lender of Seller for
indirect damages resulting from Damages incurred by Buyer due to a misrepresentation or breach by
Buyer to the extent that such shareholder or lender is affected solely because of their investment
in or loan to the Seller (such as diminished value of the shareholder’s investment in Buyer or a
higher risk of collection of a loan for the lender, respectively) because these items are the
subject of indemnification of Seller by Buyer hereunder; provided however, the members or lenders
of Seller shall be entitled to indemnification hereunder for Damages they directly incur due to a
misrepresentation or breach by Buyer (such as being named in a Third Party Claim).

          (c) Procedure for Claims. The indemnified party shall give the indemnifying party
prompt written Notice (an “Indemnification Claim Notice”) of any Damages or with respect to which
such indemnified party intends to base a request for indemnification under Section 11.02(a) or
Section 11.02(b). Failure to promptly give any such Indemnification Claim Notice shall not
constitute a waiver of any right to indemnification or reduce in any way the indemnification
available hereunder, except to the extent such failure to notify directly increases the amount to
be indemnified hereunder. Each Indemnification Claim Notice must contain a description of the
claim and the nature and amount of such Damages (to the extent that the nature and amount of such
Damages are known at such time). The indemnified party shall furnish promptly to the indemnifying
party copies of all papers and official documents received in respect of any Damages. All
indemnification claims in respect of a party, its Affiliates or their respective directors,
officers, employees and agents (collectively, the “Indemnitees” and each an “Indemnitee”) shall be
made solely by such party (or their respective counsel) to this Agreement (the “Indemnified
Party”).

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          (d) Third Party Claims. The obligations of an indemnifying party under this Section
11.02 with respect to Damages arising from claims of any third party that are subject to
indemnification as provided for in Section 11.02(a) or Section 11.02(b) (a “Third Party Claim”)
shall be governed by and be contingent upon the following additional terms and conditions:

               (i) At its option, the indemnifying party may assume the defense of any Third Party Claim by
giving written Notice to the Indemnified Party within thirty (30) days after the indemnifying
party’s receipt of an Indemnification Claim Notice. The assumption of the defense of a Third Party
Claim by the indemnifying party shall be construed as an acknowledgment that the indemnifying party
is liable to indemnify any Indemnitee in respect of the Third Party Claim, and it shall constitute
a waiver by the indemnifying party of any defenses it may assert against any Indemnitee’s claim for
indemnification. If the indemnifying party disputes liability for the indemnification it may not
assume control of the litigation; however, it may nonetheless employ counsel of its own at its own
expense and participate in the defense of the Third Party Claim; provided however, all final
decisions regarding the Third Party Claim shall be made by the party subject to the Third Party
Claim. Upon assuming the defense of a Third Party Claim, the indemnifying party may appoint as
lead counsel in the defense of the Third Party Claim any legal counsel reasonably selected by the
indemnifying party; provided, however, that in the event that a conflict of interest arises between
the indemnifying party and the Indemnified Party such that such legal counsel cannot represent both
the indemnifying party and the Indemnified Party, the Indemnified Party may retain its own legal
counsel at the expense of the indemnifying party, and the indemnifying party and its counsel shall
cooperate with the Indemnified Party and its counsel as may be reasonably requested. In the event
the indemnifying party assumes the defense of a Third Party Claim, the Indemnified Party shall
promptly deliver to the indemnifying party all original notices and documents (including court
papers) received by any Indemnitee in connection with the Third Party Claim. Except as set forth
above, should the indemnifying party assume the defense of a Third Party Claim, the indemnifying
party shall not be liable to the Indemnified Party or any other Indemnitee for any legal expenses
subsequently incurred by such Indemnified Party or other Indemnitee in connection with the
analysis, defense or settlement of the Third Party Claim. Notwithstanding the foregoing, if the
Third Party Claim alleges any criminal conduct or any other allegation that if consented to or
determined adversely will adversely affect the Indemnified Party (including without limitation, the
Business or the Products), seeks damages in excess of the Cap Amount below, or seeks any form of
injunctive relief against the Indemnified Party, the Indemnified Party shall control the litigation
if it chooses, and in any event, no settlement of the Third Party Claim may include any admission
of wrongdoing or accept any curtailment of the Business or otherwise affect Buyer’s rights with
respect to the Product or the development or commercialization thereof, or otherwise affect the
business or assets of Buyer without its written consent. In any of the circumstances referred to
in the immediately preceding sentence, the reasonable legal fees and costs of the Indemnified Party
in such event shall be included in the computation of Damages subject to indemnity hereunder.

               (ii) Without limiting Section 11.02(d)(i), any Indemnitee shall be entitled to participate in,
but not control, the defense of such Third Party Claim and to employ counsel of its choice for such
purpose; provided, however, that such employment shall be at the Indemnitee’s own expense, except
as provided in Section 11.02(d)(i), unless (A) the employment thereof has been specifically
authorized by the indemnifying party in writing, or (B) the indemnifying party has failed to assume
the defense and employ counsel in accordance with Section 11.02(d)(i) (in which case the
Indemnified Party shall control the defense).

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               (iii) With respect to any Damages relating solely to the payment of money damages in
connection with a Third Party Claim and that will not result in the Indemnitee’s or the Indemnified
Party’s becoming subject to injunctive or other relief or otherwise adversely affect the business
or reputation of the Indemnitee or the Indemnified Party in any manner, and as to which the
indemnifying party shall have acknowledged in writing the obligation to indemnify the Indemnitee
hereunder, the indemnifying party shall have the sole right to consent to the entry of any
judgment, enter into any settlement or otherwise dispose of such Damages, on such terms as the
indemnifying party, in its sole discretion, shall deem appropriate, provided that, as a result of
or in connection with any such settlement each Indemnitee or Indemnified Party shall receive a full
release with respect to such claim. With respect to all other Damages in connection with Third
Party Claims, where the indemnifying party has assumed the defense of the Third Party Claim in
accordance with Section 11.02(d)(i), the indemnifying party shall have authority to consent to the
entry of any judgment, enter into any settlement or otherwise dispose of such Damages; provided,
however, that it obtains the prior written consent of the Indemnified Party (which consent shall
not be unreasonably withheld, delayed or conditioned). The indemnifying party shall not be liable
for any settlement or other disposition of Damages by an Indemnitee or Indemnified Party that is
reached without the written consent of the indemnifying party; provided however, if the
indemnifying party refuses to consent to such settlement or other disposition of Damages and there
is ultimately a judicial determination of other disposition of the matter resulting in higher
Damages, the indemnifying party shall be liable for such additional Damages without regard to the
Cap Amount defined below. Regardless of whether the indemnifying party chooses to defend or
prosecute any Third Party Claim, no Indemnitee or Indemnified Party shall admit any liability with
respect to, or settle, compromise or discharge, any Third Party Claim without the prior written
consent of the indemnifying party; subject to the proviso in the immediately preceding sentence.

               (iv) Regardless of whether the indemnifying party chooses to defend or prosecute any Third
Party Claim, the Indemnified Party and each indemnifying party shall, and shall cause each other
Indemnitee or Affiliate of any such indemnifying party, as applicable, to, cooperate in the defense
or prosecution thereof and shall furnish such records, information and testimony, provide such
witnesses and attend such conferences, discovery proceedings, hearings, trials and appeals as may
be reasonably requested in connection therewith. Such cooperation shall include access during
normal business hours afforded to the indemnifying party or Indemnified Party, as applicable, to,
and reasonable retention by each such Person of, records and information that are reasonably
relevant to such Third Party Claim, and making each such Person and other employees and agents
available on a mutually convenient basis to provide additional information and explanation of any
material provided hereunder, and the indemnifying party shall reimburse each such Person for all
its reasonable out-of-pocket expenses in connection therewith.

     Section 11.03. Limitations.

          (a) In no event shall Seller be liable for any Damages pursuant to a claim based upon a
representation or warranty or covenant or agreement pursuant to Section 11.02(a) (“Buyer Eligible
Claim”), (i) unless and until the aggregate amount of all Buyer Eligible Claims exceeds of $350,000
(the “Buyer Deductible”), in which case Seller shall be liable only for Damages in excess of the
Buyer Deductible, and then (ii) not for any amount in excess of the aggregate of the Consideration
paid and the Assumed Liabilities assumed by Buyer under Section 4.01 (the “Buyer Cap Amount”) for
all Buyer Eligible Claims made under Section 11.02(a), in the aggregate. For purposes of
determining the Buyer Cap Amount, the term Assumed Liabilities as used in this Section 11.03 shall
exclude the Nastech Payment, unless, and until, Buyer has paid the Nastech Payment.

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Notwithstanding any other provision hereof, the Buyer Deductible and the Buyer Cap Amount
shall not apply to breaches of the following Sections by Seller: 2.04, 6.01, 6.02, 6.06, 6.07,
6.13, or to claims under Sections 11.02(a)(ii) and 11.02(a)(iii). With respect to claims relating
to breaches of the representations and warranties contained in Sections 6.02 and 6.05(b), (i) there
expressly shall be no limitations or reductions of any nature whether pursuant to this Section
11.03(a), 11.03(c), 11.03(d), the last sentence of Section 11.02(a), or otherwise and all of such
limitations shall be deemed inapplicable and (ii) irrespective of any provisions of Section
11.02(d) that may limit or restrict Buyer’s entitlement to separate counsel or to indemnification
for all legal costs, the Buyer shall be entitled to full indemnification of all Damages and all
other losses of any nature and costs of legal fees and other costs and expenses in any respect
relating to a breach or alleged breach of the representations and warranties of Seller set forth in
Sections 6.02 and 6.05(b).

          (b) In no event shall Buyer be liable for any Damages pursuant to a claim based upon a
representation or warranty or covenant or agreement pursuant to Section 11.02(b) (“Seller Eligible
Claim”), (i) unless and until the aggregate amount of all Seller Eligible Claims exceeds of
$350,000 (the “Seller Deductible”), in which case Buyer shall be liable only for Damages in excess
of the Seller Deductible, and then (ii) not for any amount in excess of $1,500,000 (the “Seller Cap
Amount”) for all Eligible Claims made under Section 11.02(b), in the aggregate. Notwithstanding
any other provision hereof, the Seller Deductible and the Seller Cap Amount shall not apply to
breaches of the following Sections by Buyer: 7.01, 7.02 and 7.06, or to claims under Sections
11.02(b)(ii), 11.02(b)(iii) and 11.02(b)(iv) (except that claims under Section 11.02(b)(iv) for
attorneys’ fees and related litigation costs shall be subject to the Seller Cap Amount).

          (c) The amount of any Damages for which indemnification is provided under this Article XI
shall be net of any amounts recovered by the Indemnified Party under insurance policies with
respect to such Damages, after giving effect to any premium adjustments related to such Damages,
provided that an Indemnified Party shall have no obligation to seek recovery under any insurance
policies prior to seeking recovery from the indemnifying party. For purposes of clarification, in
the event there is a reduction in Damages payable hereunder by a party due to an insurance
recovery, the amount of the insurance recovery that will be used to reduce the Damages claim shall
be offset by the increase in insurance premiums due to the incurrence of the insurance claim. If
there is no reduction of the amount of Damages payable because there is either no insurance
recovery or the recovery must be repaid from the Damages paid pursuant to this Article 11, then
Damages shall not be increased by any increase in insurance premiums relating to the event or
occurrence that gave rise to the Damages claim.

          (d) Buyer and Seller agree that the sole and exclusive remedy for money damages for any
matters relating to this Agreement, the Related Agreements and any certificate or instrument
delivered pursuant hereto or thereto shall be the rights to indemnification set forth in this
Article XI; provided however, each party shall be entitled to seek such injunctive or other
non-monetary equitable relief as may be appropriate with respect to breaches of covenants contained
herein.

     Section 11.04. Indemnification Payments Made to Buyer. Any payments required of
Seller to Buyer pursuant to the terms of this Agreement (whether for indemnification or otherwise)
shall be paid into the Buyer’s bank account maintained under a control account structure with its
primary lender Fortress Credit Corp. The Buyer and Fortress Credit Corp. shall by joint
instruction to Seller provide the relevant account information for wire transfer or other delivery
of such payments and

36

 

keep such account information up to date as appropriate following the closing, or by joint
instruction provide notice to Seller that this Section 11.04 is no longer applicable.

ARTICLE XII

TERMINATION AND ABANDONMENT

     Section 12.01. Methods of Termination. Prior to the Closing, the transactions
contemplated herein may be terminated and/or abandoned at any time:

          (a) by mutual written agreement of Seller and Buyer;

          (b) by Seller if the Closing shall not have occurred by December 31, 2005 (the “Termination
Date”); provided, however, that the right to terminate this Agreement pursuant to this Section
12.01(b) shall not be available to Seller if its failure to perform any of its obligations under
this Agreement or any Related Agreement results in the failure of the Closing to occur by such
time;

          (c) by Buyer if the Closing shall not have occurred by the Termination Date; provided,
however, that the right to terminate this Agreement pursuant to this Section 12.01(c) shall not be
available to Buyer if its failure to perform in all material respects any of its obligations under
this Agreement or any Related Agreement results in the failure of the Closing to occur by such
time;

          (d) by either Seller or Buyer if there shall be in effect any Law that prohibits the Closing
or if the Closing would violate any non-appealable Order;

          (e) by either Seller or Buyer if any of the conditions to their obligations to Close pursuant
to Articles VIII or IX, respectively, are not met or waived on or before the Termination Date; or

          (f) by either Seller or Buyer if the other party has breached any material obligation
(including but not limited to a breach of representation or warranty herein) hereunder that remains
uncured for a period of thirty (30) days following the delivery of Notice to the breaching party,
unless such breach is not capable of cure, in which event the non-breaching party may terminate
immediately.

          (g) by Buyer if Seller shall have willfully and materially breached its obligations under
Section 8.11.

     Section 12.02. Procedure upon Termination. In the event of termination and
abandonment pursuant to Section 12.01, written Notice thereof shall forthwith be given to the other
party, and the transactions contemplated by this Agreement shall be terminated and abandoned,
without further action by the parties hereto. If the transactions contemplated by this Agreement
are terminated and/or abandoned as provided herein:

          (a) each party, if requested, will redeliver all documents, work papers and other material of
the other party and its Affiliates relating to the transactions contemplated hereby, whether so
obtained before or after the execution hereof, to the party furnishing the same; and

          (b) no party hereto and none of its directors, officers, stockholders, Affiliates or
Controlling Persons shall have any further liability or obligation to any other party to this
Agreement,

37

 

except that nothing in this Section 12.02 shall prejudice any rights, claims, or causes of
action that may have accrued hereunder or with respect hereto prior to the date of such
termination, including for breach of this Agreement (whether based upon the termination or
otherwise).

     Section 12.03. Specific Performance. The parties acknowledge that the transactions
contemplated hereby are unique and specifically identifiable. Accordingly, the parties further
agree and stipulate that, if the Closing does not occur because of the willful failure of Seller,
on the one hand, or Buyer, on the other hand, to perform their respective obligations hereunder,
(a) monetary damages and any other remedy at law will not be adequate, (b) the non-defaulting party
shall be entitled to specific performance as the remedy for such breach, (c) each party agrees to
waive any objection to the remedy of specific performance, (d) each party agrees that the granting
of specific performance by any court will not be deemed to be harsh or oppressive to the party who
is ordered specifically to perform its obligations under this Agreement and (e) in connection with
any action for specific performance, the prevailing party shall be entitled to reasonable
attorneys’ fees and other costs of prosecuting or defending such action. The right to seek
specific performance hereunder shall not preclude any party to seek any other remedy at law or in
equity.

ARTICLE XIII

MISCELLANEOUS

     Section 13.01. Notices. All Notices, requests and other communications hereunder must
be in writing and will be deemed to have been duly given only if (a) delivered personally against
written receipt, (b) delivered by facsimile transmission with answer back confirmation, (c) mailed,
postage prepaid by certified or registered mail, return receipt requested, or (d) delivered by
nationally recognized overnight courier that maintains records of delivery, in each case to the
parties at the following addresses or facsimile numbers:

     If to Buyer to:

QOL Medical LLC

516-D River Highway, #158

Mooresville, North Carolina 28117-6830

Attention: Trevor Blake, CEO

     With a copy to:

William Bryant, Esq.

325 Five Acre Road

Alpharetta, Georgia 30004

678-366-9382

Facsimile: 678-366-9381

38

 

     If to Seller to:

Questcor Pharmaceuticals, Inc.

3260 Whipple Road

Union City, CA 94587

Facsimile: (510) 400-0710

Attention: Steve Cartt

     With a copy to:

Stradling Yocca Carlson & Rauth

660 Newport Center Drive, Suite 1600

Newport Beach, CA 92660

Facsimile: (949) 725-4100

Attention: Michael H. Mulroy, Esq.

All such Notices, requests and other communications will (i) if delivered personally to the address
as provided in this Section 13.01, be deemed given upon receipt, (ii) if delivered by facsimile to
the facsimile number as provided in this Section 13.01, be deemed given upon receipt by the sender
of the answer back confirmation and (iii) if delivered by mail in the manner described above or by
overnight courier to the address as provided in this Section 13.01, be deemed given upon receipt
(in each case regardless of whether such Notice, request or other communication is received by any
other Person to whom a copy of such Notice, request or other communication is to be delivered
pursuant to this Section 13.01). Any party from time to time may change its address, facsimile
number or other information for the purpose of Notices to that party by giving Notice specifying
such change to the other parties hereto in accordance with the terms of this Section 13.01.

     Section 13.02. Entire Agreement. This Agreement, the Related Agreements (and all
Exhibits and Schedules attached hereto and all other documents delivered in connection herewith)
supersede all prior discussions and agreements among the parties with respect to the subject matter
hereof and contain the sole and entire agreement among the parties hereto with respect to the
subject matter hereof (except as otherwise set forth in Section 8.04(c)).

     Section 13.03. Waiver. Any term or condition of this Agreement may be waived at any
time by the party that is entitled to the benefit thereof, but no such waiver shall be effective
unless set forth in a written instrument duly executed by or on behalf of the party waiving such
term or condition. No waiver by any party hereto of any term or condition of this Agreement, in
any one or more instances, shall be deemed to be or construed as a waiver of the same or any other
term or condition of this Agreement on any future occasion. All remedies, either under this
Agreement or by law or otherwise afforded, will be cumulative and not in the alternative.

     Section 13.04. Amendment. This Agreement may be amended, supplemented or modified
only by a written instrument duly executed by each party hereto.

     Section 13.05. Third Party Beneficiaries. The terms and provisions of this Agreement
are intended solely for the benefit of each party hereto and their respective successors or
permitted assigns and it is not the intention of the parties to confer third party beneficiary
rights upon any other Person, except as achieved through the indemnification clause set forth in
Section 11.02.

39

 

     Section 13.06. Assignment; Binding Effect. Neither this Agreement nor any right,
interest or obligation hereunder may be assigned by any party hereto without the prior written
consent of the other party hereto and any attempt to do so will be void, except that an Indemnified
Party under Article XI may assign any of its rights, benefits or obligations hereunder, by
operation of law or otherwise, (a) to any of its Affiliates, provided such Indemnified Party
continues to be responsible for all of its obligations hereunder, (b) to a Person that (i)
purchases all or substantially all of the assets being conveyed hereunder or (ii) merges with Buyer
or the Indemnified Party or (c) to the lenders of Buyer and its successors or assigns. This
Agreement is binding upon, inures to the benefit of and is enforceable by the parties hereto and
their respective successors and permitted assigns.

     Section 13.07. Headings. The headings used in this Agreement have been inserted for
convenience of reference only and do not define or limit the provisions hereof.

     Section 13.08. Severability. If any provision of this Agreement is held to be
illegal, invalid or unenforceable under any present or future law, and if the rights or obligations
of any party hereto under this Agreement will not be materially and adversely affected thereby, (i)
such provision will be fully severable, (ii) this Agreement will be construed and enforced as if
such illegal, invalid or unenforceable provision had never comprised a part hereof, (iii) the
remaining provisions of this Agreement will remain in full force and effect and will not be
affected by the illegal, invalid or unenforceable provision or by its severance herefrom, and (iv)
in lieu of such illegal, invalid or unenforceable provision, there will be added automatically as a
part of this Agreement a legal, valid and enforceable provision as similar to the terms of such
illegal, invalid or unenforceable provision as may be possible and reasonably acceptable to the
parties herein.

     Section 13.09. Governing Law; Venue. This Agreement shall be deemed to be made in
and in all respects shall be interpreted, construed and governed by and in accordance with the law
of the state of California without regard to the conflict of applicable law principles thereof.
Each of the parties hereto irrevocably and unconditionally submits to the exclusive jurisdiction of
the Superior Court for the State of California, County of Alameda and the United States District
Court for the Northern District of California, for the purposes of any suit, action or other
proceeding arising out of this Agreement or any transaction contemplated hereby (and each agrees
that no such action, suit or proceeding relating to this Agreement shall be brought by it or any of
its Affiliates except in such courts). Each of the parties hereto further agrees that, to the
fullest extent permitted by applicable Law, service of any process, summons, notice or document by
U.S. registered mail to such person’s respective address set forth above shall be effective service
of process for any action, suit or proceeding with respect to any matters to which it has submitted
to jurisdiction as set forth above in the immediately preceding sentence. Each of the parties
hereto irrevocably and unconditionally waives (and agrees not to plead or claim) any objection to
the laying of venue of any action, suit or proceeding arising out of this Agreement or the
transactions contemplated hereby in such courts, or that any such action, suit or proceeding
brought in any such court has been brought in an inconvenient forum.

     Section 13.10. Equitable Relief. The parties agree that irreparable damage would
occur and that the parties would not have any adequate remedy at law in the event that any of the
provisions of this Agreement were not performed in accordance with their specific terms or were
otherwise breached. It is accordingly agreed that the parties shall be entitled to an injunction
or injunctions (or similar equitable relief) to prevent breaches of this Agreement and to enforce
specifically the terms and provisions of this Agreement in the Superior Court for the State of
California, County of

40

 

Alameda and the United States District Court for the Northern District of California, this
being in addition to any other remedy to which they are entitled at law or in equity

     Section 13.11. Expenses. Except as otherwise provided in this Agreement or the
Related Agreements, each party hereto shall pay its own expenses and costs incidental to the
preparation of this Agreement and the Related Agreements and to the consummation of the
transactions contemplated hereby and thereby. Notwithstanding the foregoing, or anything else
contained in this Agreement, in any way limiting Buyer’s right to pursue additional remedies,
Seller shall pay Buyer’s expenses (including attorneys’ fees) in the event Buyer terminates this
Agreement under Section 12.01(f).

     Section 13.12. Counterparts. This Agreement may be executed in any number of
counterparts and by facsimile, each of which will be deemed an original, but all of which together
will constitute one and the same instrument. A facsimile copy shall be a sufficient proof of
signature, without it being necessary to produce the original copy.

[SIGNATURES ON FOLLOWING PAGE]

41

 

     IN WITNESS WHEREOF, this Agreement has been executed by the parties hereto all as of the date
first above written.

	 	 	 	 	 
	 	 	QUESTCOR PHARMACEUTICALS, INC.
	 
	 	 	 	 
	 

	 	By:
	 	/s/ JAMES L. FARES
	 

	 	 	 	 
	 

	 	 	 	James L. Fares
	 

	 	 	 	Chief Executive Officer
	 
	 	 	 	 
	 	 	QOL MEDICAL LLC
	 
	 	 	 	 
	 

	 	By:
	 	/s/ TREVOR BLAKE
	 

	 	 	 	 
	 

	 	 	 	Name: Trevor Blake
	 

	 	 	 	Title: Chief Executive Officer

42<PAGE>

                                                                    EXHIBIT 10.1

                                                                  EXECUTION COPY

                        SENIOR SUBORDINATED SERIES B UNIT
                               PURCHASE AGREEMENT

                                  BY AND AMONG

                              CROSSTEX ENERGY, L.P.

                                       AND

                           THE PURCHASERS PARTY HERETO

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<S>                                                                                      <C>
                                        ARTICLE I
                                       DEFINITIONS

Section 1.01     Definitions.......................................................      1
Section 1.02     Accounting Procedures and Interpretation..........................      5

                                        ARTICLE II
                              AGREEMENT TO SELL AND PURCHASE

Section 2.01     Authorization of Sale of Senior Subordinated Series B Units.......      5
Section 2.02     Sale and Purchase.................................................      5
Section 2.03     Closing...........................................................      6
Section 2.04     Conditions to the Closing.........................................      6
Section 2.05     Crosstex Deliveries...............................................      7
Section 2.06     Purchasers' Deliveries............................................      8

                                       ARTICLE III
                              REPRESENTATIONS AND WARRANTIES
                                   RELATED TO CROSSTEX

Section 3.01     Corporate Existence................................................     8
Section 3.02     Capitalization and Valid Issuance of Purchased Units...............     9
Section 3.03     Crosstex SEC Documents.............................................    10
Section 3.04     No Material Adverse Change.........................................    11
Section 3.05     Litigation.........................................................    11
Section 3.06     No Conflicts.......................................................    11
Section 3.07     Authority, Enforceability..........................................    12
Section 3.08     Approvals..........................................................    12
Section 3.09     MLP Status.........................................................    12
Section 3.10     Investment Company Status..........................................    12
Section 3.11     Certain Fees.......................................................    13
Section 3.12     No Side Agreements.................................................    13
Section 3.13     Material Agreements................................................    13
Section 3.14     PUHCA..............................................................    13

                                        ARTICLE IV
                       REPRESENTATIONS AND WARRANTIES AND COVENANTS
                                    OF THE PURCHASERS

Section 4.01     Existence..........................................................    13
Section 4.02     Authorization, Enforceability......................................    13
Section 4.03     No Breach..........................................................    14
Section 4.04     Certain Fees.......................................................    14
Section 4.05     No Side Agreements.................................................    14
Section 4.06     Unregistered Securities............................................    14
Section 4.07     Lock-Up............................................................    15
</TABLE>

                                       i
<PAGE>

<TABLE>
<S>                                                                                     <C>
                                        ARTICLE V
                           INDEMNIFICATION, COSTS AND EXPENSES

Section 5.01     Indemnification by Crosstex.......................................     15
Section 5.02     Indemnification by the Purchasers.................................     15
Section 5.03     Indemnification Procedure.........................................     16

                                        ARTICLE VI
                                      MISCELLANEOUS

Section 6.01     Interpretation and Survival of Provisions.........................     17
Section 6.02     Survival of Provisions............................................     17
Section 6.03     No Waiver; Modifications in Writing...............................     17
Section 6.04     Binding Effect; Assignment........................................     18
Section 6.05     Non-Disclosure....................................................     18
Section 6.06     Communications....................................................     18
Section 6.07     Removal of Legend.................................................     20
Section 6.08     Entire Agreement..................................................     20
Section 6.09     Governing Law.....................................................     20
Section 6.10     Execution in Counterparts.........................................     20
Section 6.11     Termination.......................................................     21

Exhibit A --     Form of Registration Rights Agreement
Exhibit B --     Form of Opinion of Crosstex Counsel
Exhibit C --     Form of Fourth Amended and Restated Agreement of Limited Partnership
</TABLE>

                                       ii
<PAGE>

              SENIOR SUBORDINATED SERIES B UNIT PURCHASE AGREEMENT

      This SENIOR SUBORDINATED SERIES B UNIT PURCHASE AGREEMENT, dated as of
October 18, 2005 (this "Agreement"), is by and between CROSSTEX ENERGY, L.P., a
Delaware limited partnership ("Crosstex"), and each of the purchasers set forth
in Schedule A hereto ("the Purchasers").

      WHEREAS, on August 8, 2005, Crosstex entered into a definitive purchase
agreement, (the "SoLa Asset Acquisition Agreement") with El Paso Corporation, a
Delaware corporation, to acquire, directly or indirectly, 100% of the equity
interests in CFS Louisiana Midstream Company, El Paso Dauphin Island Company,
L.L.C. and Sabine Pass Plant Facility Joint Venture, from El Paso Corporation
(the "SoLa Asset Acquisition");

      WHEREAS, Crosstex desires to finance a portion of the SoLa Asset
Acquisition through the sale of Senior Subordinated Series B Units to the
Purchasers and the Purchasers desire to collectively purchase such Senior
Subordinated Series B Units from Crosstex in accordance with the provisions of
this Agreement.

      WHEREAS, Crosstex has agreed to provide the Purchasers with certain
registration rights with respect to the Common Units underlying the Senior
Subordinated Series B Units acquired pursuant hereto.

      NOW THEREFORE, in consideration of the mutual covenants and agreements set
forth herein and for good and valuable consideration, the receipt of which is
hereby acknowledged, the parties hereby agree as follows:

                                   ARTICLE I

                                  DEFINITIONS

      Section 1.01 Definitions. As used in this Agreement, and unless the
context requires a different meaning, the following terms have the meanings
indicated:

      "Affiliate" means, with respect to a specified Person, any other Person,
directly or indirectly controlling, controlled by or under direct or indirect
common control with such specified Person. For purposes of this definition,
"control" (including, with correlative meanings, "controlling", "controlled by",
and "under common control with") means the power to direct or cause the
direction of the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise.

      "Allocated Purchase Price" means with respect to each Purchaser, the
number of Purchased Units multiplied by the Senior Subordinated Series B Unit
Price.

      "Anniversary Date" means 135 days from the Closing Date.

      "Basic Documents" means, collectively, this Agreement, the Registration
Rights Agreement, the Partnership Agreement, the Non-Disclosure Agreements and
any and all other agreements or instruments executed and delivered to the
Purchasers by Crosstex or any Subsidiary of Crosstex hereunder or thereunder.

                                       1
<PAGE>

      "Business Day" means any day other than a Saturday, Sunday, or a legal
holiday for commercial banks in Houston, Texas.

      "Closing" shall have the meaning specified in Section 2.03.

      "Closing Date" shall have the meaning specified in Section 2.03.

      "Commission" means the United States Securities and Exchange Commission.

      "Common Units" means the common units representing limited partner
interests in Crosstex.

      "Crosstex" has the meaning set forth in the introductory paragraph.

      "Crosstex Credit Facility" means the Third Amended and Restated Credit
Agreement dated as of March 31, 2005, by and among Crosstex, Crosstex Energy
Services, L.P. and the lenders named therein.

      "Crosstex Financial Statements" shall have the meaning specified in
Section 3.03.

      "Crosstex Master Shelf Agreement" means the Amended and Restated Senior
Secured Notes Master Shelf Agreement, dated as of March 31, 2005 among Crosstex
Energy, L.P., Crosstex Energy Services, L.P., Prudential Investment Management,
Inc. and certain other parties, as amended by the Letter Amendment No. 1 to the
Master Shelf Agreement, dated June 22, 2005.

      "Crosstex Material Adverse Effect" means any material and adverse effect
on (a) the assets, liabilities, financial condition, business, operations,
affairs or prospects of Crosstex and its Subsidiaries taken as a whole; (b) the
ability of Crosstex and its Subsidiaries taken as a whole to carry out their
business as such business is conducted as of the date hereof or to meet their
obligations under the Basic Documents on a timely basis; or (c) the ability of
Crosstex to consummate the transactions under any Basic Document; provided,
however, that a Crosstex Material Adverse Effect shall not include any material
and adverse effect on the foregoing to the extent such material and adverse
effect results from, arises out of, or relates to (x) a general deterioration in
the economy or changes in the general state of the industries in which the
Crosstex Parties operate, except to the extent that the Crosstex Parties, taken
as a whole, are adversely affected in a disproportionate manner as compared to
other industry participants, (y) the outbreak or escalation of hostilities
involving the United States, the declaration by the United States of a national
emergency or war or the occurrence of any other calamity or crisis, including
acts of terrorism, or (z) any change in accounting requirements or principles
imposed upon Crosstex and its Subsidiaries or their respective businesses or any
change in applicable Law, or the interpretation thereof.

      "Crosstex Parties" means Crosstex, the General Partner, and all of
Crosstex's Subsidiaries.

      "Crosstex Related Parties" shall have the meaning specified in Section
5.02.

                                       2
<PAGE>

      "Crosstex SEC Documents" shall have the meaning specified in Section 3.03.

      "Delaware LP Act" shall have the meaning specified in Section 3.02.

      "Exchange Act" means the Securities Exchange Act of 1934, as amended from
time to time, and the rules and regulations of the Commission promulgated
thereunder.

      "GAAP" means generally accepted accounting principles in the United States
of America in effect from time to time.

      "General Partner" means Crosstex Energy GP, L.P., a Delaware limited
partnership, and includes Crosstex Energy GP, LLC, a Delaware limited liability
company and the general partner of Crosstex Energy GP, L.P.

      "Governmental Authority" means, with respect to a particular Person, any
country, state, county, city and political subdivisions in which such Person or
such Person's Property is located or which exercises valid jurisdiction over any
such Person or such Person's Property, and any court, agency, department,
commission, board, bureau or instrumentality of any of them and any monetary
authority which exercises valid jurisdiction over any such Person or such
Person's Property. Unless otherwise specified, all references to Governmental
Authority herein with respect to Crosstex means a Governmental Authority having
jurisdiction over Crosstex, its Subsidiaries or any of their respective
Properties.

      "Indemnified Party" shall have the meaning specified in Section 5.03.

      "Indemnifying Party" shall have the meaning specified in Section 5.03.

      "Law" means any federal, state, local or foreign order, writ, injunction,
judgment, settlement, award, decree, statute, law, rule or regulation.

      "Lien" means any interest in Property securing an obligation owed to, or a
claim by, a Person other than the owner of the Property, whether such interest
is based on the common law, statute or contract, and whether such obligation or
claim is fixed or contingent, and including but not limited to the lien or
security interest arising from a mortgage, encumbrance, pledge, security
agreement, conditional sale or trust receipt or a lease, consignment or bailment
for security purposes. For the purpose of this Agreement, a Person shall be
deemed to be the owner of any Property which it has acquired or holds subject to
a conditional sale agreement, or leases under a financing lease or other
arrangement pursuant to which title to the Property has been retained by or
vested in some other Person in a transaction intended to create a financing.

      "NASDAQ" means the NASDAQ National Market.

      "Non-Disclosure Agreements" means (a) the non-disclosure agreements (i)
between Crosstex and Kayne Anderson MLP Investment Company dated April 30, 2005,
(ii) between Crosstex and Kayne Anderson Capital Advisors, L.P. dated September
6, 2005, (iii) between Crosstex and Tortoise Energy Capital Corp and (iv)
between Crosstex and Tortoise Energy Infrastructure Corporation and (b) the
master confidentiality agreement between Banc of America Securities LLC and
Fiduciary/Claymore Opportunity Fund dated September 2, 2005.

                                        3
<PAGE>

      "Partnership Agreement" means the Third Amended and Restated Agreement of
Limited Partnership of Crosstex dated as of June 24, 2005, as amended from time
to time, including as of the Closing Date.

      "Partnership Securities" means any class or series of equity interest in
Crosstex (but excluding any options, rights, warrants and appreciation rights
relating to an equity interest in Crosstex), including without limitation Common
Units, Senior Subordinated Units, Subordinated Units (as defined in the
Partnership Agreement) and Incentive Distribution Rights (as defined in the
Partnership Agreement).

      "Permits" means, with respect to Crosstex or any of its Subsidiaries, any
licenses, permits, variances, consents, authorizations, waivers, grants,
franchises, concessions, exemptions, orders, registrations and approvals of
Governmental Authorities or other Persons necessary for the ownership, leasing,
operation, occupancy or use of its Properties or the conduct of its businesses
as currently conducted.

      "Person" means any individual, corporation, company, voluntary
association, partnership, joint venture, trust, limited liability company,
unincorporated organization or government or any agency, instrumentality or
political subdivision thereof, or any other form of entity.

      "Property" means any interest in any kind of property or asset, whether
real, personal or mixed, or tangible or intangible.

      "Purchase Price" means $105,000,078.60 which is the aggregate of each
Purchaser's Allocated Purchase Price as set forth on Schedule A hereto.

      "Purchased Units" means with respect to each Purchaser, the number of
Senior Subordinated Series B Units as set forth on Schedule A hereto.

      "Purchaser" has the meaning set forth in the introductory paragraph.

      "Purchaser Related Parties" shall have the meaning specified in Section
5.01.

      "Registration Rights Agreement" means the Registration Rights Agreement,
to be entered into at the Closing, between Crosstex and the Purchasers in the
form attached hereto as Exhibit A.

      "Representatives" of any Person means the officers, directors, employees,
agents, counsel, accountants, investment bankers and other representatives of
such Person.

      "Securities Act" means the Securities Act of 1933, as amended from time to
time, and the rules and regulations of the Commission promulgated thereunder.

      "Senior Secured Credit Facility" means a Senior Secured Credit Facility on
the terms set forth in the Commitment Letter dated August 27, 2005 and the
related term sheet, each of which has previously been provided to the
Purchasers.

      "Senior Subordinated Series B Unit Price" means $36.84.

                                       4
<PAGE>

      "Senior Subordinated Series B Units" means the senior subordinated Series
B units representing limited partner interests in Crosstex and any Common Units
into which such Senior Subordinated Series B Units convert.

      "Senior Subordinated Units" means the senior subordinated units
representing limited partner interests in Crosstex.

      "SoLa Asset Acquisition" shall have the meaning specified in the recitals.

      "SoLa Asset Acquisition Agreement" shall have the meaning specified in the
recitals.

      "Subordinated Units" means the subordinated units representing limited
partner interests in Crosstex.

      "Subsidiary" means, as to any Person, any corporation or other entity of
which: (i) such Person or a Subsidiary of such Person is a general partner or
manager; or (ii) at least a majority of the outstanding equity interest having
by the terms thereof ordinary voting power to elect a majority of the board of
directors or similar governing body of such corporation or other entity
(irrespective of whether or not at the time any equity interest of any other
class or classes of such corporation or other entity shall have or might have
voting power by reason of the happening of any contingency) is at the time
directly or indirectly owned or controlled by such Person or one or more of its
Subsidiaries.

      Section 1.02 Accounting Procedures and Interpretation. Unless otherwise
specified herein, all accounting terms used herein shall be interpreted, all
determinations with respect to accounting matters hereunder shall be made, and
all Crosstex Financial Statements and certificates and reports as to financial
matters required to be furnished to the Purchasers hereunder shall be prepared,
in accordance with GAAP applied on a consistent basis during the periods
involved (except as may be indicated in the notes thereto or, in the case of
unaudited statements, as permitted by Form 10-Q promulgated by the Commission)
and in compliance as to form in all material respects with applicable accounting
requirements and with the published rules and regulations of the Commission with
respect thereto.

                                   ARTICLE II

                         AGREEMENT TO SELL AND PURCHASE

      Section 2.01 Authorization of Sale of Senior Subordinated Series B Units.
Crosstex has authorized the issuance and sale to the Purchasers of the Purchased
Units.

      Section 2.02 Sale and Purchase. Subject to the terms and conditions
hereof, Crosstex hereby agrees to issue and sell to each Purchaser, and each
Purchaser hereby agrees to purchase from Crosstex, the number of Purchased Units
as set forth on Schedule A (such number of Purchased Units set forth thereon
with respect to each Purchaser), and each Purchaser agrees to pay Crosstex its
Allocated Purchase Price.

      Section 2.03 Closing. Subject to the terms and conditions hereof, the
consummation of the purchase and sale of the Purchased Units hereunder (the
"Closing") shall take place at the offices of Vinson & Elkins, L.L.P., First
City Tower, 1001 Fannin, Houston, Texas 77002,

                                       5
<PAGE>

concurrently with the closing of the Senior Secured Credit Facility and the SoLa
Asset Acquisition (the date of such closings, the "Closing Date").

      Section 2.04 Conditions to the Closing.

            (a) Mutual Conditions. The respective obligations of each party to
consummate the purchase and issuance and sale of the Purchased Units shall be
subject to the satisfaction on or prior to the Closing Date of each of the
following conditions (any or all of which may be waived by a particular party on
behalf of itself in writing, in whole or in part, to the extent permitted by
applicable Law):

                  (i) no statute, rule, order, decree or regulation shall have
been enacted or promulgated, and no action shall have been taken, by any
Governmental Authority of competent jurisdiction which temporarily,
preliminarily or permanently restrains, precludes, enjoins or otherwise
prohibits the consummation of the transactions contemplated hereby or makes the
transactions contemplated hereby illegal;

                  (ii) there shall not be pending any suit, action or proceeding
by any Governmental Authority seeking to restrain, preclude, enjoin or prohibit
the transactions contemplated by this Agreement; and

                  (iii) a notification form and supporting documentation, if
any, related to the Common Units issuable on conversion of the Purchased Units
shall have been filed with the NASDAQ.

            (b) Purchasers' Conditions. The obligation of each Purchaser to
consummate the purchase of the Purchased Units shall be subject to the
satisfaction on or prior to the Closing Date of each of the following conditions
(any or all of which may be waived by such Purchaser in writing, in whole or in
part, to the extent permitted by applicable Law):

                  (i) Crosstex shall have given each Purchaser at least two (2)
Business Days prior written notice of the Closing Date;

                  (ii) Since the date of this Agreement, no Crosstex Material
Adverse Effect shall have occurred and be continuing;

                  (iii) Crosstex shall have consummated the SoLa Asset
Acquisition pursuant to the SoLa Asset Acquisition Agreement, and acquired the
Acquired Companies and each of the Acquired Company Assets (as each is defined
in the SoLa Asset Acquisition Agreement);

                  (iv) Crosstex shall have executed the Senior Secured Credit
Facility;

                  (v) Crosstex shall have performed and complied with the
covenants and agreements contained in this Agreement which are required to be
performed and complied with by Crosstex on or prior to the Closing Date;

                                       6
<PAGE>

                  (vi) The representations and warranties of Crosstex contained
in this Agreement that are qualified by materiality or Crosstex Material Adverse
Effect shall be true and correct as of the Closing Date and all other
representations and warranties shall be true and correct in all material
respects as of the Closing Date (except that representations made as of a
specific date shall be required to be true and correct as of such date only);

                  (vii) Crosstex shall have delivered, or caused to be
delivered, to the Purchasers at the Closing, Crosstex's closing deliveries
described in Section 2.05;

                  (viii) Crosstex shall have amended the Partnership Agreement
in the form attached as Exhibit C hereto to provide for the issuance of the
Senior Subordinated Series B Units.

            (c) Crosstex's Conditions. The obligation of Crosstex to consummate
the sale of the Purchased Units to each Purchaser shall be subject to the
satisfaction on or prior to the Closing Date of the condition (which may be
waived by Crosstex in writing, in whole or in part, to the extent permitted by
applicable Law) that the representations and warranties of such Purchaser
contained in this Agreement shall be true and correct in all material respects
at and as of the Closing Date (except that representations made as of a specific
date shall be required to be true and correct as of such date only).

      Section 2.05 Crosstex Deliveries. At the Closing, subject to the terms and
conditions hereof, Crosstex will deliver, or cause to be delivered, to the
Purchasers:

            (a) A certificate or certificates representing the Purchased Units
(bearing the legend set forth in Section 4.05(e)) and meeting the requirements
of the Partnership Agreement, free and clear of any Liens, other than transfer
restrictions under applicable federal and state securities laws;

            (b) Copies of the Certificate of Limited Partnership of (i) Crosstex
and (ii) Crosstex Energy GP, L.P. and of the Certificate of Formation of
Crosstex Energy GP, LLC, each certified by the Secretary of State of the
jurisdiction of its formation as of a recent date;

            (c) A certificate of the Secretary of State of the State of
Delaware, dated a recent date, that Crosstex is in good standing;

            (d) A cross-receipt executed by Crosstex and delivered to the
Purchasers certifying that it has received the Purchase Price as of the Closing
Date;

            (e) An opinion addressed to the Purchasers from legal counsel to
Crosstex, dated as of the Closing, in the form and substance attached hereto as
Exhibit B;

            (f) The Registration Rights Agreement in substantially the form
attached hereto as Exhibit A, which shall have been duly executed by Crosstex;

            (g) A certificate, dated the Closing Date and signed by (x) the
Chief Executive Officer and (y) the Chief Financial Officer of Crosstex Energy
GP, LLC, in their capacities as such, stating that:

                                       7
<PAGE>

                  (i) Crosstex has performed and complied with the covenants and
      agreements contained in this Agreement that are required to be performed
      and complied with by Crosstex on or prior to the Closing Date;

                  (ii) The representations and warranties of Crosstex contained
      in this Agreement that are qualified by materiality or Crosstex Material
      Adverse Effect were true and correct when made and as of the Closing Date
      and all other representations and warranties were true and correct in all
      material respects when made and are true and correct in all material
      respects as of the Closing Date, in each case as though made at and as of
      the Closing Date (except that representations made as of a specific date
      shall be required to be true and correct as of such date only); and

            (h) A certificate of the Secretary or Assistant Secretary of
Crosstex GP, LLC, on behalf of Crosstex, certifying as to (1) the Partnership
Agreement, as amended, (2) board resolutions authorizing the execution and
delivery of the Basic Documents and the SoLa Asset Acquisition Agreement and the
consummation of the transactions contemplated thereby and hereby and (3) its
incumbent officers authorized to execute the Basic Documents and the SoLa Asset
Acquisition Agreement, setting forth the name and title and bearing the
signatures of such officers.

      Section 2.06 Purchasers' Deliveries

            (a) Payment to Crosstex of each Purchaser's Allocated Purchase Price
by wire transfer of immediately available funds to an account designated by
Crosstex in writing;

            (b) The Registration Rights Agreement in substantially the form
attached hereto as Exhibit A, which shall have been duly executed by each
Purchaser; and

            (c) A cross-receipt executed by each Purchaser and delivered to
Crosstex certifying that it has received its respective Purchased Units as of
the Closing Date.

                                   ARTICLE III
                         REPRESENTATIONS AND WARRANTIES
                               RELATED TO CROSSTEX

      Crosstex represents and warrants to each Purchaser as follows:

      Section 3.01 Corporate Existence. Crosstex (a) is a limited partnership
duly formed, validly existing and in good standing under the laws of the State
of Delaware; and (b) has all requisite power and authority, and has all
governmental licenses, authorizations, consents and approvals necessary, to own,
lease, use and operate its Properties and carry on its business as its business
is now being conducted, except where the failure to obtain such licenses,
authorizations, consents and approvals would not be reasonably likely to have a
Crosstex Material Adverse Effect. Each of Crosstex's Subsidiaries has been duly
incorporated or formed, as the case may be, and is validly existing and in good
standing under the laws of the State or other jurisdiction of its incorporation
or organization, as the case may be, and has all requisite power and authority,
and has all governmental licenses, authorizations, consents and approvals
necessary, to own, lease, use or operate its respective Properties and carry on
its business as now being conducted,

                                       8
<PAGE>

except where the failure to obtain such licenses, authorizations, consents and
approvals would not be reasonably likely to have a Crosstex Material Adverse
Effect. None of Crosstex nor any of its Subsidiaries are in default in the
performance, observance or fulfillment of any provision of, in the case of
Crosstex, the Partnership Agreement or its Certificate of Limited Partnership
or, in the case of any Subsidiary of Crosstex, its respective certificate of
incorporation, certification of formation, bylaws, limited liability company
agreement or other similar organizational documents. Each of Crosstex and its
Subsidiaries is duly qualified or licensed and in good standing as a foreign
limited partnership, limited liability company or corporation, as applicable,
and is authorized to do business in each jurisdiction in which the ownership or
leasing of its respective Properties or the character of its respective
operations makes such qualification necessary, except where the failure to
obtain such qualification, license, authorization or good standing would not be
reasonably likely to have a Crosstex Material Adverse Effect.

      Section 3.02 Capitalization and Valid Issuance of Purchased Units.

            (a) As of the date of this Agreement, the issued and outstanding
limited partner interests of Crosstex consist of 8,834,312 Common Units,
9,334,000 Subordinated Units, 1,495,410 Senior Subordinated Units and the
Incentive Distribution Rights, as defined in the Partnership Agreement. The only
issued and outstanding general partner interests of Crosstex are the interests
of the General Partner described in the Partnership Agreement. All outstanding
Common Units, Subordinated Units, Senior Subordinated Units and Incentive
Distribution Rights and the limited partner interests represented thereby have
been duly authorized and validly issued in accordance with the Partnership
Agreement and are fully paid (to the extent required under the Partnership
Agreement) and nonassessable (except as such nonassessability may be affected by
matters described in Section 17-607 of the Delaware Revised Uniform Limited
Partnership Act (the "Delaware LP Act")).

            (b) Other than the Crosstex Energy GP, LLC Long-Term Incentive Plan,
Crosstex has no equity compensation plans that contemplate the issuance of
partnership interests of Crosstex (or securities convertible into or
exchangeable for partnership interests of Crosstex). No indebtedness having the
right to vote (or convertible into or exchangeable for securities having the
right to vote) on any matters on which Crosstex unitholders may vote are issued
or outstanding. Except as set forth in the first sentence of this Section
3.02(b) or as are contained in the Partnership Agreement, there are no
outstanding or authorized (i) options, warrants, preemptive rights,
subscriptions, calls, or other rights, convertible or exchangeable securities,
agreements, claims or commitments of any character obligating Crosstex or any of
its Subsidiaries to issue, transfer or sell any partnership interests or other
equity interest in, Crosstex or any of its Subsidiaries or securities
convertible into or exchangeable for such partnership interests, (ii)
obligations of Crosstex or any of its Subsidiaries to repurchase, redeem or
otherwise acquire any partnership interests or equity interests of Crosstex or
any of its Subsidiaries or any such securities or agreements listed in clause
(i) of this sentence or (iii) voting trusts or similar agreements to which
Crosstex or any of its Subsidiaries is a party with respect to the voting of the
equity interests of Crosstex or any of its Subsidiaries. None of the offering or
sale of the Senior Subordinated Series B Units or the registration of the Common
Units underlying the Senior Subordinated Series B Units pursuant to the
Registration Rights Agreement, all as contemplated by this Agreement, gives rise
to any rights for or relating to the registration of any Common Units or other
securities of the Partnership other than those rights

                                       9
<PAGE>

granted to the General Partner or any of its Affiliates (as such term is defined
in the Partnership Agreement) under Section 7.12 of the Partnership Agreement.

            (c) (i) All of the issued and outstanding equity interests of each
of Crosstex's Subsidiaries (except Crosstex DC Gathering Company, J.V.) are
owned, directly or indirectly, by Crosstex free and clear of any Liens (except
for such restrictions as may exist under applicable Law and except for such
Liens as may be imposed under the Crosstex Credit Facility or the Crosstex
Master Shelf Agreement), and all such ownership interests have been duly
authorized, validly issued and are fully paid (to the extent required in the
organizational documents of Crosstex's Subsidiaries, as applicable) and
non-assessable (except as such nonassessability may be affected by matters
described in Section 17-607 of the Delaware LP Act, Section 18-607 of the
Delaware Limited Liability Company Act (the "Delaware LLC Act"), Article 5.09 of
the Texas Limited Liability Company Act, Sections 3.03, 5.02 and 6.07 of the
Texas Revised Limited Partnership Act and Sections 12:1327 and 12:1328 of the
Louisiana Limited Liability Company Act) and free of preemptive rights, with no
personal liability attaching to the ownership thereof, and (ii) except as
disclosed in the Crosstex SEC Documents, neither Crosstex nor any of its
Subsidiaries owns any shares of capital stock or other securities of, or
interest in, any other Person, or is obligated to make any capital contribution
to or other investment in any other Person.

            (d) The Senior Subordinated Series B Units being purchased by each
of the Purchasers hereunder and the limited partner interests represented
thereby, will be duly authorized by Crosstex pursuant to the Partnership
Agreement prior to the Closing and, when issued and delivered to such Purchaser
against payment therefor in accordance with the terms of this Agreement, will be
validly issued, fully paid (to the extent required by the Partnership Agreement)
and nonassessable (except as such nonassessability may be affected by matters
described in Section 17-607 of the Delaware LP Act) and will be free of any and
all Liens and restrictions on transfer, other than restrictions on transfer
under the Partnership Agreement or this Agreement and under applicable state and
federal securities laws.

            (e) The Common Units are listed on the NASDAQ. At the Closing the
notification form and supporting documentation, if any, related to the Common
Units to be issued on conversion of the Purchased Units will have been filed
with the NASDAQ.

            (f) The Common Units issuable upon conversion of the Senior
Subordinated Series B Units and the limited partner interests represented
thereby will be duly authorized by Crosstex pursuant to the Partnership
Agreement prior to the Closing and, upon issuance in accordance with the terms
of Senior Subordinated Series B Units and the Partnership Agreement, will be
validly issued, fully paid (to the extent required by the Partnership Agreement)
and nonassessable (except as such nonassessability may be affected by matters
described in Section 17-607 of the Delaware LP Act) and will be free of any and
all Liens and restrictions on transfer, other than restrictions on transfer
under the Partnership Agreement or this Agreement and under applicable state and
federal securities laws.

      Section 3.03 Crosstex SEC Documents. Crosstex has timely filed with the
Commission all forms, registration statements, reports, schedules and statements
required to be filed by it under the Exchange Act or the Securities Act (all
such documents together with the Registration

                                       10
<PAGE>

Statement, collectively "Crosstex SEC Documents"). The Crosstex SEC Documents,
including, without limitation, any audited or unaudited financial statements and
any notes thereto or schedules included therein (the "Crosstex Financial
Statements"), at the time filed (in the case of registration statements, solely
on the dates of effectiveness) (except to the extent corrected by a subsequently
filed Crosstex SEC Document filed prior to the date hereof) (a) did not contain
any untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary in order to make the statements
therein (in light of the circumstances under which they were made in the case of
any prospectus) not misleading, (b) complied in all material respects with the
applicable requirements of the Exchange Act and the Securities Act, as
applicable, (c) complied as to form in all material respects with applicable
accounting requirements and with the published rules and regulations of the
Commission with respect thereto, (d) in the case of the Crosstex Financial
Statements, were prepared in accordance with GAAP applied on a consistent basis
during the periods involved (except as may be indicated in the notes thereto or,
in the case of unaudited statements, as permitted by Form 10-Q of the
Commission), and (e) in the case of the Crosstex Financial Statements, fairly
present (subject in the case of unaudited statements to normal, recurring and
year-end audit adjustments) in all material respects the consolidated financial
position of Crosstex and its Subsidiaries as of the dates thereof and the
consolidated results of its operations and cash flows for the periods then
ended. KPMG LLP is an independent public accounting firm with respect to
Crosstex and the General Partner and has not resigned or been dismissed as
independent public accountants of Crosstex or the General Partner as a result of
or in connection with any disagreement with Crosstex on a matter of accounting
principles or practices, financial statement disclosure or auditing scope or
procedure.

      Section 3.04 No Material Adverse Change. Except as set forth in or
contemplated by the Crosstex SEC Documents filed with the Commission on or prior
to the date hereof, since the date of Crosstex's most recent Form 10-K filing
with the Commission, Crosstex and its Subsidiaries have conducted their
respective businesses in the ordinary course, consistent with past practice, and
there has been no (a) change, event, occurrence, effect, fact, circumstance or
condition that has had or would be reasonably likely to have a Crosstex Material
Adverse Effect, (b) acquisition or disposition of any material asset by Crosstex
or any of its Subsidiaries or any contract or arrangement therefor, otherwise
than for fair value in the ordinary course of business or as disclosed in the
Crosstex SEC Documents, or (c) material change in Crosstex's accounting
principles, practices or methods.

      Section 3.05 Litigation. Except as set forth in the Crosstex SEC
Documents, there is no action, suit, or proceeding pending (including any
investigation, litigation or inquiry) or, to Crosstex's knowledge, contemplated
or threatened against or affecting any of the Crosstex Parties or any of their
respective officers, directors, properties or assets, which (a) questions the
validity of this Agreement or the Registration Rights Agreement or the right of
Crosstex to enter into this Agreement or the Registration Rights Agreement or to
consummate the transactions contemplated hereby and thereby or (b) (individually
or in the aggregate) would be reasonably likely to result in a Crosstex Material
Adverse Effect.

      Section 3.06 No Conflicts. The execution, delivery and performance by
Crosstex of the Basic Documents and the SoLa Asset Acquisition Agreement and
compliance by Crosstex with the terms and provisions hereof and thereof, and the
issuance and sale by Crosstex of the Purchased Units, do not and will not (a)
assuming the accuracy of the representations and

                                       11
<PAGE>

warranties of the Purchasers contained herein and their compliance with the
covenants contained herein, violate any provision of any Law or Permit having
applicability to Crosstex or any of its Subsidiaries or any of their respective
Properties, (b) conflict with or result in a violation or breach of any
provision of the certificate of limited partnership or other organizational
documents of Crosstex, or the Partnership Agreement, or any organizational
documents of any of Crosstex's Subsidiaries, (c) require any consent, approval
or notice under or result in a violation or breach of or constitute (with or
without due notice or lapse of time or both) a default (or give rise to any
right of termination, cancellation or acceleration) under any contract,
agreement, instrument, obligation, note, bond, mortgage, license, loan or credit
agreement to which Crosstex or any of its Subsidiaries is a party or by which
Crosstex or any of its Subsidiaries or any of their respective Properties may be
bound, or (d) result in or require the creation or imposition of any Lien upon
or with respect to any of the Properties now owned or hereafter acquired by
Crosstex or any of its Subsidiaries, except where any such conflict, violation,
default, breach, termination, cancellation, failure to receive consent or
approval, or acceleration with respect to the foregoing provisions of this
Section 3.06 would not be, individually or in the aggregate, reasonably likely
to result in a Crosstex Material Adverse Effect.

      Section 3.07 Authority, Enforceability. Crosstex has all necessary
partnership power and authority to execute, deliver and perform its obligations
under the Basic Documents and the SoLa Asset Acquisition Agreement and the
execution, delivery and performance by Crosstex of the Basic Documents and the
SoLa Asset Acquisition Agreement has been duly authorized by all necessary
action on the part of the General Partner; and the Basic Documents and the SoLa
Asset Acquisition Agreement constitute the legal, valid and binding obligations
of Crosstex, enforceable in accordance with their terms, except as such
enforceability may be limited by bankruptcy, insolvency, fraudulent transfer and
similar laws affecting creditors' rights generally or by general principles of
equity and except as the rights to indemnification may be limited by applicable
law. No approval from the holders of the Common and/or the Subordinated Units is
required in connection with Crosstex's issuance and sale of the Purchased Units
to the Purchasers.

      Section 3.08 Approvals. Except for the approvals required by the
Commission in connection with any registration statement filed under the
Registration Rights Agreement and for approvals which have already been
obtained, no authorization, consent, approval, waiver, license, qualification or
written exemption from, nor any filing, declaration, qualification or
registration with, any Governmental Authority or any other Person is required in
connection with the execution, delivery or performance by Crosstex of any of the
Basic Documents and the SoLa Asset Acquisition Agreement, except where the
failure to receive such authorization, consent, approval, waiver, license,
qualification or written exemption from, or to make such filing, declaration,
qualification or registration would not, individually or in the aggregate, be
reasonably likely to have a Crosstex Material Adverse Effect.

      Section 3.09 MLP Status. Crosstex has, for each taxable year beginning
after December 31, 2001, during which Crosstex was in existence, met the gross
income requirements of Section 7704(c)(2) of the Internal Revenue Code of 1986,
as amended.

      Section 3.10 Investment Company Status. Crosstex is not an "investment
company" within the meaning of the Investment Company Act of 1940, as amended.

                                       12
<PAGE>

      Section 3.11 Certain Fees. No fees or commissions are or will be payable
by Crosstex to brokers, finders, or investment bankers with respect to the sale
of any of the Purchased Units or the consummation of the transaction
contemplated by this Agreement, except to Banc of America Securities LLC.
Crosstex agrees that it will indemnify and hold harmless each Purchaser from and
against any and all claims, demands, or liabilities for broker's, finder's,
placement, or other similar fees or commissions incurred by Crosstex or alleged
to have been incurred by Crosstex in connection with the sale of the Purchased
Units or the consummation of the transactions contemplated by this Agreement.

      Section 3.12 No Side Agreements. There are no agreements by, among or
between Crosstex or any of its Affiliates, on the one hand, and the Purchasers
or any of their Affiliates, on the other hand, with respect to the transactions
contemplated hereby other than the Basic Documents nor promises or inducements
for future transactions between or among any of such parties.

      Section 3.13 Material Agreements. Crosstex has provided the Purchasers
with, or made available to the Purchasers through the Crosstex SEC Documents,
correct and complete copies of all material agreements (as defined in Section
601(b)(10) of Regulation S-K promulgated by the Commission) and of all exhibits
to the Crosstex SEC Documents, including amendments to or other modifications of
pre-existing material agreements, entered into by Crosstex.

      Section 3.14 PUHCA. Crosstex is not a "holding company," a "subsidiary
company" of a "holding company," an "affiliate" of a "holding company," or a
"public utility," as each such term is defined in the Public Utility Holding
Company Act of 1935, as amended.

                                   ARTICLE IV
                  REPRESENTATIONS AND WARRANTIES AND COVENANTS
                                OF THE PURCHASERS

      Each Purchaser, severally and not jointly, hereby represents and warrants
and covenants to Crosstex that:

      Section 4.01 Existence. Such Purchaser is duly organized and validly
existing and in good standing under the laws of its state of formation, with all
necessary power and authority to own properties and to conduct its business as
currently conducted.

      Section 4.02 Authorization, Enforceability. Such Purchaser has all
necessary legal power and authority to enter into, deliver and perform its
obligations under this Agreement and the Registration Rights Agreement. The
execution, delivery and performance of this Agreement and the Registration
Rights Agreement by such Purchaser and the consummation by it of the
transactions contemplated hereby and thereby have been duly and validly
authorized by all necessary legal action, and no further consent or
authorization of such Purchaser is required. This Agreement and the Registration
Rights Agreement have been duly executed and delivered by such Purchaser and
constitute legal, valid and binding obligations of such Purchaser; provided
that, the enforceability thereof may be limited by bankruptcy, insolvency,
fraudulent transfer, reorganization, moratorium and similar laws relating to or
affecting creditors' rights generally and by general principles of equity and
except as the rights to indemnification may be limited

                                       13
<PAGE>

applicable law (regardless of whether such enforceability is considered in a
proceeding in equity or at law).

      Section 4.03 No Breach. The execution, delivery and performance of this
Agreement and the Registration Rights Agreement by such Purchaser and the
consummation by such Purchaser of the transactions contemplated hereby and
thereby will not (a) conflict with or result in a breach or violation of any of
the terms or provisions of, or constitute a default under, any material
agreement to which such Purchaser is a party or by which the Purchaser is bound
or to which any of the property or assets of such Purchaser is subject, (b)
conflict with or result in any violation of the provisions of the organizational
documents of such Purchaser, or (c) violate any statute or order, rule or
regulation of any court or governmental agency or body having jurisdiction over
such Purchaser or the property or assets of such Purchaser, except in the case
of clauses (a) and (c), for such conflicts, breaches, violations or defaults as
would not prevent the consummation of the transactions contemplated by this
Agreement and the Registration Rights Agreement and could not, individually or
in the aggregate, reasonably be expected to have a material adverse effect on
the financial condition or prospects of such Purchaser.

      Section 4.04 Certain Fees. No fees or commissions are or will be payable
by such Purchaser to brokers, finders, or investment bankers with respect to the
purchase of any of the Purchased Units or the consummation of the transaction
contemplated by this Agreement, except, in the case of the Fiduciary/Claymore
MLP Opportunity Fund, a fee paid to A. G. Edwards & Sons, Inc. Such Purchaser
agrees that it will indemnify and hold harmless Crosstex from and against any
and all claims, demands, or liabilities for broker's, finder's, placement, or
other similar fees or commissions incurred by such Purchaser or alleged to have
been incurred by such Purchaser in connection with the purchase of the Purchased
Units or the consummation of the transactions contemplated by this Agreement.

      Section 4.05 No Side Agreements. There are no other agreements by, among
or between the Purchasers and any of their Affiliates, on the one hand, and
Crosstex or any of its Affiliates, on the other hand, with respect to the
transactions contemplated hereby other than the Basic Documents nor promises or
inducements for future transactions between or among any of such parties.

      Section 4.06 Unregistered Securities. Such Purchaser represents that:

            (a) Investment. The Purchased Units are being acquired for its own
account, not as a nominee or agent, and with no intention of distributing the
Purchased Units or any part thereof, and that Purchaser has no present intention
of selling or granting any participation in or otherwise distributing the same
in any transaction in violation of the securities laws of the United States or
any state, without prejudice, however, to such Purchaser's right at all times to
(subject to such Purchaser's agreement contained in Section 4.07 hereof) sell or
otherwise dispose of all or any part of the Purchased Units under a registration
statement under the Securities Act and applicable state securities laws or under
an exemption from such registration available thereunder (including, without
limitation, if available, Rule 144 promulgated thereunder). If such Purchaser
should in the future decide to dispose of any of the Purchased Units, such
Purchaser understands and agrees (a) that it may do so only in compliance with
the Securities Act and applicable state securities law, as then in effect, which
may include a sale contemplated by any

                                       14
<PAGE>

registration statement pursuant to which such securities are being offered, and
(b) that stop-transfer instructions to that effect will be in effect with
respect to such securities.

            (b) Nature of Purchasers. Such Purchaser represents and warrants to,
and covenants and agrees with, Crosstex that, (a) it is an "accredited investor"
within the meaning of Rule 501 of Regulation D promulgated by the Securities and
Exchange Commission pursuant to the Securities Act and (b) by reason of its
business and financial experience it has such knowledge, sophistication and
experience in making similar investments and in business and financial matters
generally so as to be capable of evaluating the merits and risks of the
prospective investment in the Purchased Units, is able to bear the economic risk
of such investment and, at the present time, would be able to afford a complete
loss of such investment.

            (c) Receipt of Information; Authorization. Such Purchaser
acknowledges that it has (a) had access to Crosstex's periodic filings with the
Commission, including Crosstex's Annual Report on Form 10-K, Quarterly Reports
on Form 10-Q, and Current Reports filed on Form 8-K, (b) had access to
information regarding the SoLa Asset Acquisition and its potential effect on
Crosstex's operations and financial results and (c) been provided a reasonable
opportunity to ask questions of and receive answers from Representatives of
Crosstex regarding such matters sufficient to enable such Purchaser to evaluate
the risks and merits of purchasing the Purchased Units and consummating the
transactions contemplated by the Basic Documents.

            (d) Legend. It is understood that the certificates evidencing the
Purchased Units will bear the following legend: "These securities have not been
registered under the Securities Act of 1933, as amended. They may not be sold,
offered for sale, pledged or hypothecated in the absence of a registration
statement in effect with respect to the securities under such Act or an opinion
of counsel satisfactory to the Company that such registration is not required or
unless sold pursuant to Rule 144 of such Act."

      Section 4.07 Lock-Up. Such Purchaser agrees that from and after Closing it
will not sell any of the Purchased Units or the Common Units into which such
Purchased Units convert prior to the Anniversary Date.

                                   ARTICLE V
                       INDEMNIFICATION, COSTS AND EXPENSES

      Section 5.01 Indemnification by Crosstex. Crosstex agrees to indemnify
each Purchaser and its Representatives (collectively, "Purchaser Related
Parties") from, and hold each of them harmless against, any and all losses,
actions, suits, proceedings (including any investigations, litigation or
inquiries), demands, and causes of action, and, in connection therewith, and
promptly upon demand, pay or reimburse each of them for all reasonable costs,
losses, liabilities, damages, or expenses of any kind or nature whatsoever,
including, without limitation, the reasonable fees and disbursements of counsel
and all other reasonable expenses incurred in connection with investigating,
defending or preparing to defend any such matter that may be incurred by them or
asserted against or involve any of them as a result of, arising out of, or in
any way related to the breach of any of the representations, warranties or
covenants of Crosstex contained herein, provided such claim for indemnification
relating to a breach of a representation or warranty is made prior to the
expiration of such representation or warranty.

                                       15
<PAGE>

      Section 5.02 Indemnification by the Purchasers. Each Purchaser agrees to
indemnify Crosstex, the General Partners and their respective Representatives
(collectively, "Crosstex Related Parties") from, and hold each of them harmless
against, any and all losses, actions, suits, proceedings (including any
investigations, litigation or inquiries), demands, and causes of action, and, in
connection therewith, and promptly upon demand, pay or reimburse each of them
for all reasonable costs, losses, liabilities, damages, or expenses of any kind
or nature whatsoever, including, without limitation, the reasonable fees and
disbursements of counsel and all other reasonable expenses incurred in
connection with investigating, defending or preparing to defend any such matter
that may be incurred by them or asserted against or involve any of them as a
result of, arising out of, or in any way related to the breach of any of the
representations, warranties or covenants of such Purchaser contained herein,
provided such claim for indemnification relating to a breach of the
representations and warranties is made prior to the expiration of such
representations and warranties.

      Section 5.03 Indemnification Procedure. Promptly after any Crosstex
Related Party or Purchaser Related Party (hereinafter, the "Indemnified Party")
has received notice of any indemnifiable claim hereunder, or the commencement of
any action, suit or proceeding by a third person, which the Indemnified Party
believes in good faith is an indemnifiable claim under this Agreement, the
Indemnified Party shall give the indemnitor hereunder (the "Indemnifying Party")
written notice of such claim or the commencement of such action, suit or
proceeding, but failure to so notify the Indemnifying Party will not relieve the
Indemnifying Party from any liability it may have to such Indemnified Party
hereunder except to the extent that the Indemnifying Party is materially
prejudiced by such failure. Such notice shall state the nature and the basis of
such claim to the extent then known. The Indemnifying Party shall have the right
to defend and settle, at its own expense and by its own counsel, any such matter
as long as the Indemnifying Party pursues the same diligently and in good faith.
If the Indemnifying Party undertakes to defend or settle, it shall promptly
notify the Indemnified Party of its intention to do so, and the Indemnified
Party shall cooperate with the Indemnifying Party and its counsel in all
commercially reasonable respects in the defense thereof and the settlement
thereof. Such cooperation shall include, but shall not be limited to, furnishing
the Indemnifying Party with any books, records and other information reasonably
requested by the Indemnifying Party and in the Indemnified Party's possession or
control. Such cooperation of the Indemnified Party shall be at the cost of the
Indemnifying Party. After the Indemnifying Party has notified the Indemnified
Party of its intention to undertake to defend or settle any such asserted
liability, and for so long as the Indemnifying Party diligently pursues such
defense, the Indemnifying Party shall not be liable for any additional legal
expenses incurred by the Indemnified Party in connection with any defense or
settlement of such asserted liability; provided, however, that the Indemnified
Party shall be entitled (i) at its expense, to participate in the defense of
such asserted liability and the negotiations of the settlement thereof and (ii)
if (A) the Indemnifying Party has failed to assume the defense and employ
counsel or (B) if the defendants in any such action include both the Indemnified
Party and the Indemnifying Party and counsel to the Indemnified Party shall have
concluded that there may be reasonable defenses available to the Indemnified
Party that are different from or in addition to those available to the
Indemnifying Party or if the interests of the Indemnified Party reasonably may
be deemed to conflict with the interests of the Indemnifying Party, then the
Indemnified Party shall have the right to select a separate counsel and to
assume such legal defense and otherwise to participate in the defense of such
action, with the expenses and fees of such separate counsel and other expenses
related to such participation to be

                                       16
<PAGE>

reimbursed by the Indemnifying Party as incurred. Notwithstanding any other
provision of this Agreement, the Indemnifying Party shall not settle any
indemnified claim without the consent of the Indemnified Party, unless the
settlement thereof imposes no liability or obligation on, and includes a
complete release from liability of, the Indemnified Party.

                                   ARTICLE VI
                                  MISCELLANEOUS

      Section 6.01 Interpretation and Survival of Provisions. Article, Section,
Schedule, and Exhibit references are to this Agreement, unless otherwise
specified. All references to instruments, documents, contracts, and agreements
are references to such instruments, documents, contracts, and agreements as the
same may be amended, supplemented, and otherwise modified from time to time,
unless otherwise specified. The word "including" shall mean "including but not
limited to." Whenever Crosstex has an obligation under the Basic Documents, the
expense of complying with that obligation shall be an expense of Crosstex unless
otherwise specified. Whenever any determination, consent, or approval is to be
made or given by the Purchasers, such action shall be in such Purchaser's sole
discretion unless otherwise specified in this Agreement. If any provision in the
Basic Documents is held to be illegal, invalid, not binding, or unenforceable,
such provision shall be fully severable and the Basic Documents shall be
construed and enforced as if such illegal, invalid, not binding, or
unenforceable provision had never comprised a part of the Basic Documents, and
the remaining provisions shall remain in full force and effect.

      Section 6.02 Survival of Provisions. The representations and warranties
set forth in Sections 3.02, 3.07, 3.11, 3.12, 4.04, 4.05 and 4.06 hereunder
shall survive the execution and delivery of this Agreement indefinitely, and the
other representations and warranties set forth herein shall survive for a period
of twelve (12) months following the Closing Date regardless of any investigation
made by or on behalf of Crosstex or the Purchasers. The covenants made in this
Agreement or any other Basic Document shall survive the Closing of the
transactions described herein and remain operative and in full force and effect
regardless of acceptance of any of the Purchased Units and payment therefor and
repayment, conversion, exercise or repurchase thereof. All indemnification
obligations of Crosstex and the Purchasers and the provisions of Article V shall
remain operative and in full force and effect unless such obligations are
expressly terminated in a writing referencing that individual Section,
regardless of any purported general termination of this Agreement.

      Section 6.03 No Waiver; Modifications in Writing.

            (a) Delay. No failure or delay on the part of any party in
exercising any right, power, or remedy hereunder shall operate as a waiver
thereof, nor shall any single or partial exercise of any such right, power, or
remedy preclude any other or further exercise thereof or the exercise of any
other right, power, or remedy. The remedies provided for herein are cumulative
and are not exclusive of any remedies that may be available to a party at law or
in equity or otherwise.

            (b) Specific Waiver. Except as otherwise provided herein, no
amendment, waiver, consent, modification, or termination of any provision of
this Agreement or any other

                                       17
<PAGE>

Basic Document shall be effective unless signed by each of the parties hereto or
thereto affected by such amendment, waiver, consent, modification, or
termination. Any amendment, supplement or modification of or to any provision of
this Agreement or any other Basic Document, any waiver of any provision of this
Agreement or any other Basic Document, and any consent to any departure by
Crosstex from the terms of any provision of this Agreement or any other Basic
Document shall be effective only in the specific instance and for the specific
purpose for which made or given. Except where notice is specifically required by
this Agreement, no notice to or demand on Crosstex in any case shall entitle
Crosstex to any other or further notice or demand in similar or other
circumstances.

      Section 6.04 Binding Effect; Assignment.

            (a) Binding Effect. This Agreement shall be binding upon Crosstex,
each Purchaser, and their respective successors and permitted assigns. Except as
expressly provided in this Agreement, this Agreement shall not be construed so
as to confer any right or benefit upon any Person other than the parties to this
Agreement and their respective successors and permitted assigns.

            (b) Assignment of Purchased Units. All or any portion of Purchased
Units purchased pursuant to this Agreement may be sold, assigned or pledged by
such Purchaser, subject to compliance with applicable securities laws, Section
4.07 herein and the Registration Rights Agreement.

            (c) Assignment of Rights. All or any portion of the rights and
obligations of each Purchaser under this Agreement may be transferred by such
Purchaser to any Affiliate of such Purchaser without the consent of Crosstex.
All or any portion of the rights and obligations of each Purchaser under this
Agreement may not be transferred by such Purchaser to a non-Affiliate without
the written consent of Crosstex.

      Section 6.05 Non-Disclosure. Notwithstanding anything herein to the
contrary, the Non-Disclosure Agreement shall remain in full force and effect
regardless of any termination of this Agreement.

      Section 6.06 Communications. All notices and demands provided for
hereunder shall be in writing and shall be given by registered or certified
mail, return receipt requested, telecopy, air courier guaranteeing overnight
delivery or personal delivery to the following addresses:

                                       18
<PAGE>

            (a)   If to Fiduciary/Claymore MLP Opportunity Fund:

                  c/o Fiduciary Asset Management
                  8112 Maryland Avenue, Suite 400
                  St. Louis MO 63105
                  Attention:  Jim Cunnane
                  Facsimile:  (314) 863-4360

            (b)   If to Kayne Anderson MLP Investment Company or Kayne Anderson
                  Energy Total Return Fund, Inc.:

                  1800 Avenue of the Stars, 2nd Floor
                  Los Angeles, CA 90067
                  Attention:  David Shladovsky, Esq.
                  Facsimile:  (310) 284-6490

                  and

                  1100 Louisiana, Suite 4550
                  Houston, Texas 77002
                  Attention:  Kevin McCarthy
                  Facsimile:  (713) 655-7359

                  with a copy to:

                  Vinson & Elkins L.L.P.
                  1001 Fannin, Suite 2300
                  Houston, TX 77002
                  Attention:  Dan Fleckman
                  Facsimile:  (713) 615-5859

            (c)   If to Tortoise Energy Capital Corp. or Tortoise Energy
                  Infrastructure Corporation:

                  10801 Mastin, Suite 222
                  Overland Park, KS 66210
                  Attention:  David Schulte
                  Facsimile:  (913) 345-2763

                  with a copy to:

                  Blackwell Sanders Peper Martin LLP
                  2300 Main Street, Suite 1000
                  Kansas City, MO 64108
                  Attention:  Steven F. Carman
                  Facsimile:  (816) 983-8080

                                       19
<PAGE>

            (d)   If to Crosstex:

                  Crosstex Energy, L.P.
                  2501 Cedar Springs
                  Dallas, Texas 75201
                  Attention:  Barry E. Davis
                  Facsimile:  (214) 953-9500

                  with a copy to:

                  Baker Botts L.L.P.
                  2001 Ross Avenue
                  Dallas, Texas 75201-2980
                  Attention: Doug Rayburn
                  Facsimile: (214) 661-4634

or to such other address as Crosstex or such Purchaser may designate in writing.
All notices and communications shall be deemed to have been duly given: at the
time delivered by hand, if personally delivered; upon actual receipt if sent by
certified mail, return receipt requested, or regular mail, if mailed; when
receipt acknowledged, if sent via facsimile; and upon actual receipt when
delivered to an air courier guaranteeing overnight delivery.

      Section 6.07 Removal of Legend. Each Purchaser may request Crosstex to
remove the legend described in Section 4.06(e) from the certificates evidencing
the Purchased Units by submitting to Crosstex such certificates, together with
an opinion of counsel to the effect that such legend is no longer required under
the Securities Act or applicable state laws, as the case may be.

      Section 6.08 Entire Agreement. This Agreement, the other Basic Documents
and the other agreements and documents referred to herein are intended by the
parties as a final expression of their agreement and intended to be a complete
and exclusive statement of the agreement and understanding of the parties hereto
in respect of the subject matter contained herein and therein. There are no
restrictions, promises, warranties or undertakings, other than those set forth
or referred to herein or the other Basic Documents with respect to the rights
granted by Crosstex or any of its Affiliates or the Purchasers or any of their
Affiliates set forth herein or therein. This Agreement, the other Basic
Documents and the other agreements and documents referred to herein or therein
supersede all prior agreements and understandings between the parties with
respect to such subject matter.

      Section 6.09 Governing Law. THIS AGREEMENT WILL BE CONSTRUED IN ACCORDANCE
WITH AND GOVERNED BY THE LAWS OF THE STATE OF TEXAS WITHOUT REGARD TO PRINCIPLES
OF CONFLICTS OF LAWS.

      Section 6.10 Execution in Counterparts. This Agreement may be executed in
any number of counterparts and by different parties hereto in separate
counterparts, each of which

                                       20
<PAGE>

counterparts, when so executed and delivered, shall be deemed to be an original
and all of which counterparts, taken together, shall constitute but one and the
same Agreement.

      Section 6.11 Termination.

            (a) In the event that any of the conditions to a party's obligation
to close specified in Section 2.04 is not satisfied at or prior to the Closing
Date, such party may terminate this Agreement.

            (b) In the event that the Closing Date does not take place on or
before November 1, 2005, either party may terminate this Agreement.

            (c) In the event of any termination of this Agreement pursuant to
this Section 6.11, this Agreement shall forthwith become null and void. In the
event of such termination, there shall be no liability on the part of any party
hereto; provided that nothing herein shall relieve any party from any liability
or obligation with respect to any willful breach of this Agreement.

                                       21
<PAGE>

      IN WITNESS WHEREOF, the parties hereto execute this Agreement, effective
as of the date first above written.

                                       CROSSTEX ENERGY, L.P.

                                         By:  CROSSTEX ENERGY GP, L.P.
                                              (its General Partner)

                                         By:  CROSSTEX ENERGY GP, LLC
                                              (its General Partner)

                                         By:  /s/ William W. Davis
                                              ----------------------------------
                                              William W. Davis,
                                              Executive Vice President and Chief
                                              Financial Officer

                     [Signature Page to Purchase Agreement]

<PAGE>

                                     FIDUCIARY/CLAYMORE MLP OPPORTUNITY
                                     FUND

                                     By: /s/ James J. Cunnane, Jr.
                                         ---------------------------------------
                                          James J. Cunnane, Jr.
                                          Managing Director and Senior Portfolio
                                            Manager

                     [Signature Page to Purchase Agreement]
<PAGE>

                                                   KAYNE ANDERSON MLP INVESTMENT
                                                    COMPANY

                                                   By: /s/ James C. Baker
                                                       -------------------------
                                                           James C. Baker
                                                           Vice President

                     [Signature Page to Purchase Agreement]

<PAGE>

                                                    KAYNE ANDERSON ENERGY TOTAL
                                                     RETURN FUND, INC.

                                                    By: /s/ James C. Baker
                                                        ------------------------
                                                            James C. Baker
                                                            Vice President

                     [Signature Page to Purchase Agreement]

<PAGE>

                                             TORTOISE ENERGY CAPITAL CORPORATION

                                             By: /s/ Zachary A. Hamel
                                                 -------------------------------
                                                     Zachary A. Hamel
                                                     Secretary

                     [Signature Page to Purchase Agreement]

<PAGE>

                                                  TORTOISE ENERGY INFRASTRUCTURE
                                                   CORPORATION

                                                  By: /s/ Zachary A. Hamel
                                                      --------------------------
                                                          Zachary A. Hamel
                                                          Secretary

                     [Signature Page to Purchase Agreement]

<PAGE>

                                   SCHEDULE A

<TABLE>
<CAPTION>
                                                                                           ALLOCATED
PURCHASER                                                          PURCHASED UNITS      PURCHASE PRICE
---------                                                          ---------------     ----------------
<S>                                                                <C>                 <C>
Fiduciary/Claymore MLP Opportunity Fund........................         407,167           15,000,032.28
Kayne Anderson MLP Investment Company..........................       1,294,789           47,700,026.76
Kayne Anderson Energy Total Return Fund, Inc...................          62,432            2,299,994.88
Tortoise Energy Capital Corp...................................         977,199           36,000,011.16
Tortoise Energy Infrastructure Corporation.....................         108,578            4,000,013.52
                                                                      ---------        ----------------
         Total.................................................       2,850,165        $ 105,000,078.60
                                                                      =========        ================
</TABLE>

                                   Schedule A

<PAGE>

                EXHIBIT A - FORM OF REGISTRATION RIGHTS AGREEMENT

                                  SEE ATTACHED

                                    Exhibit A

<PAGE>

                                                                       EXHIBIT A

                      FORM OF REGISTRATION RIGHTS AGREEMENT

                                  BY AND AMONG

                              CROSSTEX ENERGY, L.P.

                                       AND

                           THE PURCHASERS PARTY HERETO

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                         Page
                                                                                         ----
<S>                                                                                      <C>
                                    ARTICLE I
                                   DEFINITIONS

Section 1.1      Definitions..........................................................     1
Section 1.2      Registrable Securities...............................................     3

                                   ARTICLE II
                               REGISTRATION RIGHTS

Section 2.1      Shelf Registration...................................................     3
Section 2.2      Piggyback Registration...............................................     5
Section 2.3      Underwritten Offering................................................     6
Section 2.4      Sale Procedures......................................................     7
Section 2.5      Cooperation by Holders...............................................     9
Section 2.6      Restrictions on Public Sale by Holders of Registrable Securities.....     9
Section 2.7      Expenses.............................................................    10
Section 2.8      Indemnification......................................................    10
Section 2.9      Rule 144 Reporting...................................................    12
Section 2.10     Transfer or Assignment of Registration Rights........................    13
Section 2.11     Limitation on Subsequent Registration Rights.........................    13

                                   ARTICLE III
                                  MISCELLANEOUS

Section 3.1      Communications.......................................................    13
Section 3.2      Successor and Assigns................................................    15
Section 3.3      Assignment of Rights.................................................    15
Section 3.4      Recapitalization, Exchanges, etc. Affecting the Common Units.........    15
Section 3.5      Specific Performance.................................................    15
Section 3.6      Counterparts.........................................................    15
Section 3.7      Headings.............................................................    15
Section 3.8      Governing Law........................................................    15
Section 3.9      Severability of Provisions...........................................    15
Section 3.10     Entire Agreement.....................................................    16
Section 3.11     Amendment............................................................    16
Section 3.12     No Presumption.......................................................    16
</TABLE>

<PAGE>

                          REGISTRATION RIGHTS AGREEMENT

      THIS REGISTRATION RIGHTS AGREEMENT (this "Agreement") is made and entered
into as of [_______________], 2005 by and between CROSSTEX ENERGY, L.P., a
Delaware limited partnership ("Crosstex"), and each of the parties set forth on
Schedule A hereto (the "Purchasers").

      WHEREAS, this Agreement is made in connection with the Closing of the
issuance and sale of the Purchased Units pursuant to the Senior Subordinated
Series B Unit Purchase Agreement, dated as of October [__], 2005, by and between
Crosstex and the Purchasers (the "Purchase Agreement");

      WHEREAS, Crosstex has agreed to provide the registration and other rights
set forth in this Agreement for the benefit of the Purchasers pursuant to the
Purchase Agreement; and

      WHEREAS, it is a condition to the obligations of the Purchasers and
Crosstex under the Purchase Agreement that this Agreement be executed and
delivered.

      NOW THEREFORE, in consideration of the mutual covenants and agreements set
forth herein and for good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged by each party hereto, the parties
hereby agree as follows:

                                    ARTICLE I
                                   DEFINITIONS

      Section 1.1 Definitions. The terms set forth below are used herein as so
defined:

            "Affiliate" means, with respect to a specified Person, any other
Person, directly or indirectly controlling, controlled by or under direct or
indirect common control with such specified Person. For purposes of this
definition, "control" (including, with correlative meanings, "controlling,"
"controlled by," and "under common control with") means the power to direct or
cause the direction of the management and policies of such Person, directly or
indirectly, whether through the ownership of voting securities, by contract or
otherwise.

            "Anniversary Date" shall have the meaning set forth in the Purchase
Agreement.

            "Business Day" means any day other than a Saturday, Sunday, or a
legal holiday for commercial banks in Houston, Texas.

            "Closing" shall have the meaning set forth in the Purchase
Agreement.

            "Closing Date" shall have the meaning set forth in the Purchase
Agreement.

            "Commission" means the United States Securities and Exchange
Commission.

            "Common Units" shall have the meaning set forth in the Purchase
Agreement.

                                       1

<PAGE>

            "Crosstex" has the meaning specified therefor in the introductory
paragraph of this Agreement.

            "Effectiveness Period" has the meaning specified therefor in Section
2.1(a) of this Agreement.

            "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended, and the rules and regulations of the Commission promulgated thereunder.

            "Holder" means the record holder of any Registrable Securities.

            "Included Registrable Securities" has the meaning specified therefor
in Section 2.2(a) of this Agreement.

            "Losses" has the meaning specified therefor in Section 2.8(a) of
this Agreement.

            "Managing Underwriter" means, with respect to any Underwritten
Offering, the book running lead manager of such Underwritten Offering.

            "Non-Disclosure Agreements" means (a) the non-disclosure agreements
(i) between Crosstex and Kayne Anderson MLP Investment Company dated April 30,
2005, (ii) between Crosstex and Kayne Anderson Capital Advisors, L.P. dated
September 6, 2005, (iii) between Crosstex and Tortoise Energy Capital Corp and
(iv) between Crosstex and Tortoise Energy Infrastructure Corporation and (b) the
master confidentiality agreement between Banc of America Securities LLC and
Fiduciary/Claymore Opportunity Fund dated September 2, 2005.

            "Other Holder" has the meaning specified in Section 2.2(b).

            "Person" means any individual, corporation, company, voluntary
association, partnership, joint venture, trust, limited liability company,
unincorporated organization, government or any agency, instrumentality or
political subdivision thereof, or any other form of entity.

            "Piggyback Registration" has the meaning specified therefor in
Section 2.2(a) of this Agreement.

            "Purchase Agreement" has the meaning specified therefor in the
Recitals of this Agreement.

            "Purchased Units" shall have the meaning set forth in the Purchase
Agreement.

            "Purchasers" has the meaning specified therefor in the introductory
paragraph of this Agreement.

            "Registrable Securities" means the Common Units to be issued upon
conversion of the Purchased Units, all of which are subject to the rights
provided herein until such rights terminate pursuant to the provisions of this
Agreement.

                                       2

<PAGE>

            "Registration Expenses" has the meaning specified therefor in
Section 2.7(a) of this Agreement.

            "Securities Act" means the Securities Act of 1933, as amended, and
the rules and regulations of the Commission promulgated thereunder.

            "Selling Expenses" has the meaning specified therefor in Section
2.7(a) of this Agreement.

            "Selling Holder" means a Holder who is selling Registrable
Securities pursuant to a registration statement.

            "Senior Subordinated Units" means Senior Subordinated Units
purchased pursuant to the Senior Subordinated Unit Purchase Agreement, dated
June 24, 2005, by and among Crosstex and the purchasers party thereto and any
Common Units into which such Senior Subordinated Units convert.

            "Shelf Registration Statement" means a registration statement under
the Securities Act to permit the resale of the Registrable Securities from time
to time as permitted by Rule 415 of the Securities Act (or any similar provision
then in force under the Securities Act).

            "Underwritten Offering" means an offering (including an offering
pursuant to a Shelf Registration Statement) in which Common Units are sold to an
underwriter on a firm commitment basis for reoffering to the public or an
offering that is a "bought deal" with one or more investment banks.

      Section 1.2 Registrable Securities. Any Registrable Security will cease to
be a Registrable Security when (a) a registration statement covering such
Registrable Security has been declared effective by the Commission and such
Registrable Security has been sold or disposed of pursuant to such effective
registration statement; (b) such Registrable Security has been disposed of
pursuant to any Section of Rule 144 (or any similar provision then in force
under the Securities Act); (c) such Registrable Security is held by Crosstex or
one of its subsidiaries; (d) such Registrable Security has been sold in a
private transaction in which the transferor's rights under this Agreement are
not assigned to the transferee of such securities or (e) two years from the date
hereof.

                                   ARTICLE II
                               REGISTRATION RIGHTS

      Section 2.1 Shelf Registration.

            (a) Shelf Registration. As soon as practicable following the Closing
of the acquisition of the Purchased Units pursuant to the terms of the Purchase
Agreement, but in any event within 30 days of the Closing, Crosstex shall
prepare and file a Shelf Registration Statement covering the Registrable
Securities. Crosstex shall use its commercially reasonable efforts to cause the
Shelf Registration Statement to become effective no later than 90 days after the
date of the Closing. A Shelf Registration Statement filed pursuant to this
Section 2.1(a) shall be on such appropriate registration form of the Commission
as shall be selected by Crosstex;

                                       3

<PAGE>

provided, however, that if a prospectus supplement will be used in connection
with the marketing of an Underwritten Offering from the Shelf Registration
Statement and the Managing Underwriter at any time shall notify Crosstex in
writing that, in the sole judgment of such Managing Underwriter, inclusion of
detailed information to be used in such prospectus supplement is of material
importance to the success of the Underwritten Offering of such Registrable
Securities, Crosstex shall use its commercially reasonable efforts to include
such information in the prospectus. Crosstex will use its commercially
reasonable efforts to cause the Shelf Registration Statement filed pursuant to
this Section 2.1(a) to be continuously effective under the Securities Act until
the earlier of (i) all Registrable Securities covered by the Shelf Registration
Statement have been distributed in the manner set forth and as contemplated in
the Shelf Registration Statement, (ii) there are no longer any Registrable
Securities outstanding or (iii) two years from the Closing (the "Effectiveness
Period"). The Shelf Registration Statement when declared effective (including
the documents incorporated therein by reference) will comply as to form in all
material respects with all applicable requirements of the Securities Act and the
Exchange Act and will not contain an untrue statement of a material fact or omit
to state a material fact required to be stated therein or necessary to make the
statements therein not misleading. If the Shelf Registration Statement is not
declared effective within 120 days after Closing, then the Purchasers shall be
entitled to a payment (with respect to each of such Purchaser's Purchased
Units), as liquidated damages and not as a penalty, of 0.25% of the Purchase
Price per 30-day period for the first sixty (60) days following the 120th day
after Closing, with such payment amount increasing by an additional 0.25% of the
Purchase Price per 30-day period for each subsequent 60 days, up to a maximum of
1.00% of the Purchase Price per 30-day period (the "Liquidated Damages"), until
such time as the Shelf Registration Statement is declared effective or there are
no longer any Registrable Securities outstanding. The Liquidated Damages shall
be paid to each Purchaser in cash within ten (10) Business Days of the end of
such 30-day period. The Purchasers' rights (and any transferee's rights pursuant
to Section 2.10) under this Section 2.1 shall terminate when such Registrable
Securities become eligible for resale under Rule 144(k) (or any similar
provision then in force under the Securities Act).

            (b) Delay Rights. Notwithstanding anything to the contrary contained
herein, Crosstex may, upon written notice to any Selling Holder whose
Registrable Securities are included in the Shelf Registration Statement, suspend
such Selling Holder's use of any prospectus which is a part of the Shelf
Registration Statement (in which event the Selling Holder shall discontinue
sales of the Registrable Securities pursuant to the Shelf Registration
Statement) if (i) Crosstex is pursuing an acquisition, merger, reorganization,
disposition or other similar transaction and Crosstex determines in good faith
that Crosstex's ability to pursue or consummate such a transaction would be
materially and adversely affected by any required disclosure of such transaction
in the Shelf Registration Statement or (ii) Crosstex has experienced some other
material non-public event the disclosure of which at such time, in the good
faith judgment of Crosstex, would materially and adversely affect Crosstex;
however, in no event shall any delay pursuant hereto exceed sixty (60) days in
any one hundred-eighty (180) day period or ninety (90) days in any twelve-month
period. Upon disclosure of such information or the termination of the condition
described above, Crosstex shall provide prompt notice to the Selling Holders
whose Registrable Securities are included in the Shelf Registration Statement,
and shall promptly terminate any suspension of sales it has put into effect and
shall take such other actions to permit registered sales of Registrable
Securities as contemplated in this Agreement.

                                       4

<PAGE>

      Section 2.2 Piggyback Registration.

            (a) Participation. Commencing on the Anniversary Date, if Crosstex
at any time proposes to file a prospectus supplement to an effective Shelf
Registration Statement with respect to an Underwritten Offering of Common Units
for its own account or to register any Common Units for its own account for sale
to the public in an Underwritten Offering other than (x) a registration relating
solely to employee benefit plans or (y) a registration relating solely to a Rule
145 transaction, then, as soon as practicable following the engagement of
counsel to Crosstex to prepare the documents to be used in connection with an
Underwritten Offering, Crosstex shall give notice of such proposed Underwritten
Offering to the Holders, and such notice shall offer the Holders the opportunity
to include in such Underwritten Offering such number of Registrable Securities
(the "Included Registrable Securities") as each such Holder may request in
writing (a "Piggyback Registration"); provided, however, that Crosstex shall not
be required to offer such opportunity to Holders if (i) the Holders do not offer
a minimum of $5,000,000 of Registrable Securities and Senior Subordinated Units,
in the aggregate, (determined by multiplying the number of Registrable
Securities and Senior Subordinated Units owned by the average of the closing
price for Common Units for the ten (10) trading days preceding the date of such
notice) or (ii) Crosstex has been advised by the Managing Underwriter that the
inclusion of Registrable Securities for sale for the benefit of the Holders will
have an adverse effect on the price, timing or distribution of the Common Units
by Crosstex. The notice required to be provided in this Section 2.2(a) to
Holders shall be provided on a Business Day pursuant to Section 3.1 hereof and
receipt of such notice shall be confirmed by Holder. Holder shall then have two
(2) Business Days to request inclusion of Registrable Securities in the
Underwritten Offering. If no request for inclusion from a Holder is received
within the specified time, such Holder shall have no further right to
participate in such Piggyback Registration. If, at any time after giving written
notice of its intention to undertake an Underwritten Offering and prior to the
closing of such Underwritten Offering, Crosstex shall determine for any reason
not to undertake or to delay such Underwritten Offering, Crosstex may, at its
election, give written notice of such determination to the Selling Holders and,
(x) in the case of a determination not to undertake such Underwritten Offering,
shall be relieved of its obligation to sell any Included Registrable Securities
in connection with such terminated Underwritten Offering, and (y) in the case of
a determination to delay such Underwritten Offering, shall be permitted to delay
offering any Included Registrable Securities for the same period as the delay in
the Underwritten Offering. Any Selling Holder shall have the right to withdraw
such Selling Holder's request for inclusion of such Selling Holder's Registrable
Securities in such offering by giving written notice to Crosstex of such
withdrawal up to and including the time of pricing of such offering. No Holders
shall be entitled to participate in any such Underwritten Offering under this
Section 2.2(a) unless such Holder (together with any Affiliate that is a Selling
Holder) participating therein holds at least fifteen million ($15,000,000) of
Registrable Securities and Senior Subordinated Units, in the aggregate,
(determined by multiplying the number of Registrable Securities and Senior
Subordinated Units owned by the average of the closing price for Common Units
for the ten (10) trading days preceding the date of such notice).

            (b) Priority of Piggyback Registration. If the Managing Underwriter
or Underwriters of any proposed Underwritten Offering of Common Units included
in a Piggyback Registration advises Crosstex that the total amount of Common
Units which the Selling Holders

                                       5

<PAGE>

and any other Persons intend to include in such offering exceeds the number
which can be sold in such offering without being likely to have an adverse
effect on the price, timing or distribution of the Common Units offered or the
market for the Common Units, then the Common Units to be included in such
Underwritten Offering shall include the number of Registrable Securities that
such Managing Underwriter or Underwriters advises Crosstex can be sold without
having such adverse effect, with such number to be allocated pro rata among the
Selling Holders and any other Persons who have been or are granted registration
rights on or after the date of this Agreement ("Other Holders") who have
requested participation in the Piggyback Registration (based, for each such
Selling Holder or Other Holder, on the percentage derived by dividing (A) the
number of Registrable Securities proposed to be sold by such Selling Holder or
such Other Holder in such offering; by (B) the aggregate number of Common Units
proposed to be sold by all Selling Holders and all Other Holders in the
Piggyback Registration.

      Section 2.3 Underwritten Offering.

            (a) S-3 Registration. In the event that a Selling Holder (together
with any Affiliate that is a Selling Holder) elects to dispose of Registrable
Securities under the Shelf Registration Statement pursuant to an Underwritten
Offering of at least fifteen million ($15,000,000) of Registrable Securities and
Senior Subordinated Units, Crosstex shall, at the request of such Selling
Holder, enter into an underwriting agreement in customary form with the Managing
Underwriter or Underwriters, which shall include, among other provisions,
indemnities to the effect and to the extent provided in Section 2.8, and shall
take all such other reasonable actions as are requested by the Managing
Underwriter in order to expedite or facilitate the disposition of the
Registrable Securities; provided, however, that Crosstex management will not be
required to participate in a roadshow or similar marketing effort.

            (b) General Procedures. In connection with any Underwritten Offering
(i) under Section 2.2 of this Agreement, Crosstex shall be entitled to select
the Managing Underwriter or Underwriters, and (ii) under Section 2.3 of this
Agreement, the Selling Holders shall be entitled to select the Managing
Underwriter or Underwriters. In connection with an Underwritten Offering under
Section 2.2 or Section 2.3 hereof, each Selling Holder and Crosstex shall be
obligated to enter into an underwriting agreement which contains such
representations, covenants, indemnities and other rights and obligations as are
customary in underwriting agreements for firm commitment offerings of
securities. No Selling Holder may participate in such Underwritten Offering
unless such Selling Holder agrees to sell its Registrable Securities on the
basis provided in such underwriting agreement and completes and executes all
questionnaires, powers of attorney, indemnities and other documents reasonably
required under the terms of such underwriting agreement. Each Selling Holder
may, at its option, require that any or all of the representations and
warranties by, and the other agreements on the part of, Crosstex to and for the
benefit of such underwriters also be made to and for such Selling Holder's
benefit and that any or all of the conditions precedent to the obligations of
such underwriters under such underwriting agreement also be conditions precedent
to its obligations. No Selling Holder shall be required to make any
representations or warranties to or agreements with Crosstex or the underwriters
other than representations, warranties or agreements regarding such Selling
Holder and its ownership of the securities being registered on its behalf and
its intended method of distribution and any other representation required by
law. If any Selling Holder disapproves of the terms of an underwriting, such
Selling Holder may elect to withdraw

                                       6

<PAGE>

therefrom by notice to Crosstex and the Managing Underwriter; provided, however,
that such withdrawal must be made prior to the time in the penultimate sentence
of Section 2.2(a) hereof to be effective. No such withdrawal or abandonment
shall affect Crosstex's obligation to pay Registration Expenses.

      Section 2.4 Sale Procedures. In connection with its obligations contained
in Sections 2.1, 2.2 and 2.3, Crosstex will, as expeditiously as possible:

            (a) prepare and file with the Commission such amendments and
supplements to the Shelf Registration Statement and the prospectus used in
connection therewith as may be necessary to keep the Shelf Registration
Statement effective for the Effectiveness Period and as may be necessary to
comply with the provisions of the Securities Act with respect to the disposition
of all securities covered by the Shelf Registration Statement;

            (b) furnish to each Selling Holder (i) as far in advance as
reasonably practicable before filing the Shelf Registration Statement or any
other registration statement contemplated by this Agreement or any supplement or
amendment thereto, upon request, copies of reasonably complete drafts of all
such documents proposed to be filed (including exhibits and each document
incorporated by reference therein to the extent then required by the rules and
regulations of the Commission), and provide each such Selling Holder the
opportunity to object to any information pertaining to such Selling Holder and
its plan of distribution that is contained therein and make the corrections
reasonably requested by such Selling Holder with respect to such information
prior to filing the Shelf Registration Statement or such other registration
statement and the prospectus included therein or any supplement or amendment
thereto, and (ii) such number of copies of the Shelf Registration Statement or
such other registration statement and the prospectus included therein and any
supplements and amendments thereto as such Persons may reasonably request in
order to facilitate the public sale or other disposition of the Registrable
Securities covered by such Shelf Registration Statement or other registration
statement;

            (c) if applicable, use its commercially reasonable efforts to
register or qualify the Registrable Securities covered by the Shelf Registration
Statement or any other registration statement contemplated by this Agreement
under the securities or blue sky laws of such jurisdictions as the Selling
Holders or, in the case of an Underwritten Offering, the Managing Underwriter,
shall reasonably request, provided that Crosstex will not be required to qualify
generally to transact business in any jurisdiction where it is not then required
to so qualify or to take any action which would subject it to general service of
process in any such jurisdiction where it is not then so subject;

            (d) promptly notify each Selling Holder and each underwriter, at any
time when a prospectus relating thereto is required to be delivered under the
Securities Act, of (i) the filing of the Shelf Registration Statement or any
other registration statement contemplated by this Agreement or any prospectus
included therein or any amendment or supplement thereto, and, with respect to
such Shelf Registration Statement or any other registration statement or any
post-effective amendment thereto, when the same has become effective; and (ii)
any written comments from the Commission with respect to any filing referred to
in clause (i) and any written request by the Commission for amendments or
supplements to the Shelf Registration Statement or any other registration

                                       7

<PAGE>

statement or any prospectus or prospectus supplement thereto;

            (e) immediately notify each Selling Holder and each underwriter, at
any time when a prospectus relating thereto is required to be delivered under
the Securities Act, of (i) the happening of any event as a result of which the
prospectus contained in the Shelf Registration Statement or any other
registration statement contemplated by this Agreement or any supplemental
amendment thereto, includes an untrue statement of a material fact or omits to
state any material fact required to be stated therein or necessary to make the
statements therein not misleading in the light of the circumstances then
existing; (ii) the issuance or threat of issuance by the Commission of any stop
order suspending the effectiveness of the Shelf Registration Statement or any
other registration statement contemplated by this Agreement, or the initiation
of any proceedings for that purpose; or (iii) the receipt by Crosstex of any
notification with respect to the suspension of the qualification of any
Registrable Securities for sale under the applicable securities or blue sky laws
of any jurisdiction. Following the provision of such notice, Crosstex agrees to
as promptly as practicable amend or supplement the prospectus or prospectus
supplement or take other appropriate action so that the prospectus or prospectus
supplement does not include an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein not misleading in the light of the circumstances then
existing and to take such other action as is necessary to remove a stop order,
suspension, threat thereof or proceedings related thereto;

            (f) upon request and subject to appropriate confidentiality
obligations, furnish to each Selling Holder copies of any and all transmittal
letters or other correspondence with the Commission or any other governmental
agency or self-regulatory body or other body having jurisdiction (including any
domestic or foreign securities exchange) relating to such offering of
Registrable Securities;

            (g) in the case of an Underwritten Offering, furnish upon request,
(i) an opinion of counsel for Crosstex, dated the effective date of the
applicable registration statement or the date of any amendment or supplement
thereto, preliminary or prospectus supplement, and a letter of like kind dated
the date of the closing under the underwriting agreement, and (ii) a "cold
comfort" letter, dated the effective date of the applicable registration
statement or the date of any amendment or supplement thereto, preliminary or
prospectus supplement and a letter of like kind dated the date of the closing
under the underwriting agreement, in each case, signed by the independent public
accountants who have certified Crosstex's financial statements included or
incorporated by reference into the applicable registration statement, and each
of the opinion and the "cold comfort" letter shall be in customary form and
covering substantially the same matters with respect to such registration
statement (and the prospectus included therein any supplement thereto) and as
are customarily covered in opinions of issuer's counsel and in accountants'
letters delivered to the underwriters in Underwritten Offerings of securities,
such other matters as such underwriters may reasonably request;

            (h) otherwise use its commercially reasonable efforts to comply with
all applicable rules and regulations of the Commission, and make available to
its security holders, as soon as reasonably practicable, an earnings statement
covering the period of at least 12 months, but not more than 18 months,
beginning with the first full calendar month after the effective date

                                       8

<PAGE>

of such registration statement, which earnings statement shall satisfy the
provisions of Section 11(a) of the Securities Act and Rule 158 promulgated
thereunder;

            (i) make available to the appropriate representatives of the
Managing Underwriter and Selling Holders access to such information and Crosstex
personnel as is reasonable and customary to enable such parties to establish a
due diligence defense under the Securities Act; provided that Crosstex need not
disclose any information to any such representative unless and until such
representative has entered into a confidentiality agreement with Crosstex;

            (j) cause all such Registrable Securities registered pursuant to
this Agreement to be listed on each securities exchange or nationally recognized
quotation system on which similar securities issued by Crosstex are then listed;

            (k) use its commercially reasonable efforts to cause the Registrable
Securities to be registered with or approved by such other governmental agencies
or authorities as may be necessary by virtue of the business and operations of
Crosstex to enable the Selling Holders to consummate the disposition of such
Registrable Securities;

            (l) provide a transfer agent and registrar for all Registrable
Securities covered by such registration statement not later than the effective
date of such registration statement; and

            (m) enter into customary agreements and take such other actions as
are reasonably requested by the Selling Holders or the underwriters, if any, in
order to expedite or facilitate the disposition of such Registrable Securities.

      Each Selling Holder, upon receipt of notice from Crosstex of the happening
of any event of the kind described in subsection (e) of this Section 2.4, shall
forthwith discontinue disposition of the Registrable Securities until such
Selling Holder's receipt of the copies of the supplemented or amended prospectus
contemplated by subsection (e) of this Section 2.4 or until it is advised in
writing by Crosstex that the use of the prospectus may be resumed, and has
received copies of any additional or supplemental filings incorporated by
reference in the prospectus, and, if so directed by Crosstex, such Selling
Holder will, or will request the Managing Underwriter or underwriters, if any,
to deliver to Crosstex (at Crosstex's expense) all copies in their possession or
control, other than permanent file copies then in such Selling Holder's
possession, of the prospectus and any prospectus supplement covering such
Registrable Securities current at the time of receipt of such notice.

      Section 2.5 Cooperation by Holders. Crosstex shall have no obligation to
include in the Shelf Registration Statement units of a Holder or in a Piggyback
Registration units of a Selling Holder who has failed to timely furnish such
information which, in the opinion of counsel to Crosstex, is reasonably required
in order for the registration statement or prospectus supplement, as applicable,
to comply with the Securities Act.

      Section 2.6 Restrictions on Public Sale by Holders of Registrable
Securities. Each Holder of Registrable Securities who is included in the Shelf
Registration Statement agrees not to effect any public sale or distribution of
the Registrable Securities during the 30 calendar day period beginning on the
date of a prospectus supplement filed with the Commission with respect

                                       9

<PAGE>

to the pricing of an Underwritten Offering, provided that the duration of the
foregoing restrictions shall be no longer than the duration of the shortest
restriction generally imposed by the underwriters on the officers or directors
or any other unitholder of Crosstex on whom a restriction is imposed and
provided further that such Selling Holder (together with any Affiliate that is a
Selling Holder) owns at least fifteen million ($15,000,000) of Registrable
Securities and Senior Subordinated Units, in the aggregate (determined by
multiplying the number of Registrable Securities and Senior Subordinated Units
owned by the average of the closing price for Common Units for the ten (10)
trading days preceding the date of such filing).

      Section 2.7 Expenses.

            (a) Certain Definitions. "Registration Expenses" means all expenses
incident to Crosstex's performance under or compliance with this Agreement to
effect the registration of Registrable Securities in a Shelf Registration
pursuant to Section 2.1, a Piggyback Registration pursuant to Section 2.2, or an
Underwritten Offering pursuant to Section 2.3, and the disposition of such
securities, including, without limitation, all registration, filing, securities
exchange listing and NASDAQ National Market fees, all registration, filing,
qualification and other fees and expenses of complying with securities or blue
sky laws, fees of the National Association of Securities Dealers, Inc., transfer
taxes and fees of transfer agents and registrars, all word processing,
duplicating and printing expenses, the fees and disbursements of counsel and
independent public accountants for Crosstex, including the expenses of any
special audits or "cold comfort" letters required by or incident to such
performance and compliance. Except as otherwise provided in Section 2.8 hereof,
Crosstex shall not be responsible for legal fees incurred by Holders in
connection with the exercise of such Holders' rights hereunder. In addition,
Crosstex shall not be responsible for any "Selling Expenses," which means all
underwriting fees, discounts and selling commissions and transfer taxes
allocable to the sale of the Registrable Securities.

            (b) Expenses. Crosstex will pay all reasonable Registration Expenses
in connection with a Piggyback Registration or Underwritten Offering, whether or
not any sale is made pursuant to the Piggyback Registration or Underwritten
Offering. Each Selling Holder shall pay all Selling Expenses in connection with
any sale of its Registrable Securities hereunder.

      Section 2.8 Indemnification.

            (a) By Crosstex. In the event of a registration of any Registrable
Securities under the Securities Act pursuant to this Agreement, Crosstex will
indemnify and hold harmless each Selling Holder thereunder, its directors and
officers, and each underwriter, pursuant to the applicable underwriting
agreement with such underwriter, of Registrable Securities thereunder and each
Person, if any, who controls such Selling Holder or underwriter within the
meaning of the Securities Act and the Exchange Act, against any losses, claims,
damages, expenses or liabilities (including reasonable attorneys' fees and
expenses) (collectively, "Losses"), joint or several, to which such Selling
Holder or underwriter or controlling Person may become subject under the
Securities Act, the Exchange Act or otherwise, insofar as such Losses (or
actions or proceedings, whether commenced or threatened, in respect thereof)
arise out of or are based upon any untrue statement or alleged untrue statement
of any material fact contained in the Shelf Registration Statement or any other
registration statement contemplated by this Agreement, any

                                       10

<PAGE>

preliminary prospectus or final prospectus contained therein, or any amendment
or supplement thereof, or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein (in the case of a prospectus, in light
of the circumstances under which they were made) not misleading, and will
reimburse each such Selling Holder, its directors and officers, each such
underwriter and each such controlling Person for any legal or other expenses
reasonably incurred by them in connection with investigating or defending any
such Loss or actions or proceedings; provided, however, that Crosstex will not
be liable in any such case if and to the extent that any such Loss arises out of
or is based upon an untrue statement or alleged untrue statement or omission or
alleged omission so made in conformity with information furnished by such
Selling Holder, such underwriter or such controlling Person in writing
specifically for use in the Shelf Registration Statement or such other
registration statement, or prospectus supplement, as applicable. Such indemnity
shall remain in full force and effect regardless of any investigation made by or
on behalf of such Selling Holder or any such director, officer or controlling
Person, and shall survive the transfer of such securities by such Selling
Holder.

            (b) By Each Selling Holder. Each Selling Holder agrees severally and
not jointly to indemnify and hold harmless Crosstex, its directors and officers,
and each Person, if any, who controls Crosstex within the meaning of the
Securities Act or of the Exchange Act to the same extent as the foregoing
indemnity from Crosstex to the Selling Holders, but only with respect to
information regarding such Selling Holder furnished in writing by or on behalf
of such Selling Holder expressly for inclusion in the Shelf Registration
Statement or prospectus supplement relating to the Registrable Securities, or
any amendment or supplement thereto; provided, however, that the liability of
each Selling Holder shall not be greater in amount than the dollar amount of the
proceeds (net of any Selling Expenses) received by such Selling Holder from the
sale of the Registrable Securities giving rise to such indemnification.

            (c) Notice. Promptly after receipt by an indemnified party hereunder
of notice of the commencement of any action, such indemnified party shall, if a
claim in respect thereof is to be made against the indemnifying party hereunder,
notify the indemnifying party in writing thereof, but the omission so to notify
the indemnifying party shall not relieve it from any liability which it may have
to any indemnified party other than under this Section 2.8. In any action
brought against any indemnified party, it shall notify the indemnifying party of
the commencement thereof. The indemnifying party shall be entitled to
participate in and, to the extent it shall wish, to assume and undertake the
defense thereof with counsel reasonably satisfactory to such indemnified party
and, after notice from the indemnifying party to such indemnified party of its
election so to assume and undertake the defense thereof, the indemnifying party
shall not be liable to such indemnified party under this Section 2.8 for any
legal expenses subsequently incurred by such indemnified party in connection
with the defense thereof other than reasonable costs of investigation and of
liaison with counsel so selected; provided, however, that, (i) if the
indemnifying party has failed to assume the defense and employ counsel or (ii)
if the defendants in any such action include both the indemnified party and the
indemnifying party and counsel to the indemnified party shall have concluded
that there may be reasonable defenses available to the indemnified party that
are different from or additional to those available to the indemnifying party,
or if the interests of the indemnified party reasonably may be deemed to
conflict with the interests of the indemnifying party, then the indemnified
party shall have the right to select a separate counsel and to assume such legal

                                       11

<PAGE>

defense and otherwise to participate in the defense of such action, with the
reasonable expenses and fees of such separate counsel and other reasonable
expenses related to such participation to be reimbursed by the indemnifying
party as incurred. Notwithstanding any other provision of this Agreement, no
indemnified party shall settle any action brought against it with respect to
which it is entitled to indemnification hereunder without the consent of the
indemnifying party, unless the settlement thereof imposes no liability or
obligation on, and includes a complete and unconditional release from all
liability of, the indemnifying party.

            (d) Contribution. If the indemnification provided for in this
Section 2.8 is held by a court or government agency of competent jurisdiction to
be unavailable to Crosstex or any Selling Holder or is insufficient to hold them
harmless in respect of any Losses, then each such indemnifying party, in lieu of
indemnifying such indemnified party, shall contribute to the amount paid or
payable by such indemnified party as a result of such Losses as between Crosstex
on the one hand and such Selling Holder on the other, in such proportion as is
appropriate to reflect the relative fault of Crosstex on the one hand and of
such Selling Holder on the other in connection with the statements or omissions
which resulted in such Losses, as well as any other relevant equitable
considerations; provided, however, that in no event shall such Selling Holder be
required to contribute an aggregate amount in excess of the dollar amount of
proceeds (net of Selling Expenses) received by such Selling Holder from the sale
of Registrable Securities giving rise to such indemnification. The relative
fault of Crosstex on the one hand and each Selling Holder on the other shall be
determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact has been made by, or relates to, information supplied by such
party, and the parties' relative intent, knowledge, access to information and
opportunity to correct or prevent such statement or omission. The parties hereto
agree that it would not be just and equitable if contributions pursuant to this
paragraph were to be determined by pro rata allocation or by any other method of
allocation which does not take account of the equitable considerations referred
to in the first sentence of this paragraph. The amount paid by an indemnified
party as a result of the Losses referred to in the first sentence of this
paragraph shall be deemed to include any legal and other expenses reasonably
incurred by such indemnified party in connection with investigating or defending
any Loss which is the subject of this paragraph. No person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act)
shall be entitled to contribution from any Person who is not guilty of such
fraudulent misrepresentation.

            (e) Other Indemnification. The provisions of this Section 2.8 shall
be in addition to any other rights to indemnification or contribution which an
indemnified party may have pursuant to law, equity, contract or otherwise.

      Section 2.9 Rule 144 Reporting. With a view to making available the
benefits of certain rules and regulations of the Commission that may permit the
sale of the Registrable Securities to the public without registration, Crosstex
agrees to use its commercially reasonable efforts to:

            (a) Make and keep public information regarding Crosstex available,
as those terms are understood and defined in Rule 144 of the Securities Act, at
all times from and after the date hereof;

                                       12

<PAGE>

            (b) File with the Commission in a timely manner all reports and
other documents required of Crosstex under the Securities Act and the Exchange
Act at all times from and after the date hereof; and

            (c) So long as a Holder owns any Registrable Securities, furnish to
such Holder forthwith upon request a copy of the most recent annual or quarterly
report of Crosstex, and such other reports and documents so filed as such Holder
may reasonably request in availing itself of any rule or regulation of the
Commission allowing such Holder to sell any such securities without
registration.

      Section 2.10 Transfer or Assignment of Registration Rights. The rights to
cause Crosstex to register Registrable Securities granted to the Purchasers by
Crosstex under this Article II may be transferred or assigned by the Purchasers
to one or more transferee(s) or assignee(s) of such Registrable Securities, who
(a) are Affiliates of such Purchaser, or (b) hold at least fifteen million
($15,000,000) of Registrable Securities and Senior Subordinated Units. Crosstex
shall be given written notice prior to any said transfer or assignment, stating
the name and address of each such transferee and identifying the securities with
respect to which such registration rights are being transferred or assigned, and
each such transferee shall assume in writing responsibility for its obligations
of the Purchasers under this Agreement.

      Section 2.11 Limitation on Subsequent Registration Rights. From and after
the date hereof, Crosstex shall not, without the prior written consent of the
Holders of a majority of the outstanding Registrable Securities, enter into any
agreement with any current or future holder of any securities of Crosstex that
would allow such current or future holder to require Crosstex to include
securities in any registration statement filed by Crosstex on a basis that is
superior in any way to the piggyback rights granted to the Purchasers hereunder.

                                   ARTICLE III
                                  MISCELLANEOUS

      Section 3.1 Communications. All notices and other communications provided
for or permitted hereunder shall be made in writing by facsimile, courier
service or personal delivery:

            (a)   If to Fiduciary/Claymore MLP Opportunity Fund:

                  c/o Fiduciary Asset Management
                  8112 Maryland Avenue, Suite 400
                  St. Louis MO 63105
                  Attention: Jim Cunnane
                  Facsimile: (314) 863-4360

            (b)   If to Kayne Anderson MLP Investment Company or Kayne Anderson
                  Energy Total Return Fund, Inc.:

                  1800 Avenue of the Stars, 2nd Floor
                  Los Angeles, CA 90067
                  Attention: David Shladovsky, Esq.
                  Facsimile: (310) 284-6490

                                       13

<PAGE>

                  and

                  1100 Louisiana, Suite 4550
                  Houston, Texas 77002
                  Attention: Kevin McCarthy
                  Facsimile: (713) 655-7359

                  with a copy to:

                  Vinson & Elkins L.L.P.
                  1001 Fannin, Suite 2300
                  Houston, TX 77002
                  Attention: Dan Fleckman
                  Facsimile: (713) 615-5859

            (c)   If to Tortoise Energy Capital Corp. or Tortoise Energy
                  Infrastructure Corporation:

                  10801 Mastin, Suite 222
                  Overland Park, KS 66210
                  Attention: David Schulte
                  Facsimile: (913) 345-2763

                  with a copy to:

                  Blackwell Sanders Peper Martin LLP
                  2300 Main Street, Suite 1000
                  Kansas City, MO 64108
                  Attention: Steven F. Carman
                  Facsimile: (816) 983-8080

            (d)   If to Crosstex:

                  Crosstex Energy, L.P.
                  2501 Cedar Springs
                  Dallas, Texas 75201
                  Attention:  Barry E. Davis
                  Facsimile:  (214) 953-9500

                  with a copy to:

                  Baker Botts L.L.P.
                  2001 Ross Avenue
                  Dallas, Texas 75201-2980
                  Attention: Doug Rayburn
                  Facsimile: (214) 661-4634

                                       14

<PAGE>

or, if to a transferee of such Purchaser, to such Holder at the address provided
pursuant to Section 2.10 above. All such notices and communications shall be
deemed to have been received at the time delivered by hand, if personally
delivered; when receipt acknowledged, if sent via facsimile or sent via Internet
electronic mail; and when actually received, if sent by any other means.

      Section 3.2 Successor and Assigns. This Agreement shall inure to the
benefit of and be binding upon the successors and assigns of each of the
parties, including subsequent Holders of Registrable Securities to the extent
permitted herein.

      Section 3.3 Assignment of Rights. All or any portion of the rights and
obligations of the Purchasers under this Agreement may be transferred or
assigned by such Purchaser in accordance with Section 2.10 hereof.

      Section 3.4 Recapitalization, Exchanges, etc. Affecting the Common Units.
The provisions of this Agreement shall apply to the full extent set forth herein
with respect to any and all units of Crosstex or any successor or assign of
Crosstex (whether by merger, consolidation, sale of assets or otherwise) which
may be issued in respect of, in exchange for or in substitution of, the
Registrable Securities, and shall be appropriately adjusted for combinations,
recapitalizations and the like occurring after the date of this Agreement.

      Section 3.5 Specific Performance. Damages in the event of breach of this
Agreement by a party hereto may be difficult, if not impossible, to ascertain,
and it is therefore agreed that each such Person, in addition to and without
limiting any other remedy or right it may have, will have the right to an
injunction or other equitable relief in any court of competent jurisdiction,
enjoining any such breach, and enforcing specifically the terms and provisions
hereof, and each of the parties hereto hereby waives any and all defenses it may
have on the ground of lack of jurisdiction or competence of the court to grant
such an injunction or other equitable relief. The existence of this right will
not preclude any such Person from pursuing any other rights and remedies at law
or in equity which such Person may have.

      Section 3.6 Counterparts. This Agreement may be executed in any number of
counterparts and by different parties hereto in separate counterparts, each of
which counterparts, when so executed and delivered, shall be deemed to be an
original and all of which counterparts, taken together, shall constitute but one
and the same Agreement.

      Section 3.7 Headings. The headings in this Agreement are for convenience
of reference only and shall not limit or otherwise affect the meaning hereof.

      Section 3.8 Governing Law. The laws of the State of Texas shall govern
this Agreement without regard to principles of conflict of laws.

      Section 3.9 Severability of Provisions. Any provision of this Agreement
which is prohibited or unenforceable in any jurisdiction shall, as to such
jurisdiction, be ineffective to the extent of such prohibition or
unenforceability without invalidating the remaining provisions

                                       15

<PAGE>

hereof or affecting or impairing the validity or enforceability of such
provision in any other jurisdiction.

      Section 3.10 Entire Agreement. This Agreement, the Purchase Agreement and
the Non-Disclosure Agreement are intended by the parties as a final expression
of their agreement and intended to be a complete and exclusive statement of the
agreement and understanding of the parties hereto in respect of the subject
matter contained herein or therein. There are no restrictions, promises,
warranties or undertakings, other than those set forth or referred to herein or
therein with respect to the rights granted by Crosstex set forth herein or
therein. This Agreement, the Purchase Agreement and the Non-Disclosure Agreement
supersede all prior agreements and understandings between the parties with
respect to such subject matter.

      Section 3.11 Amendment. This Agreement may be amended only by means of a
written amendment signed by Crosstex and the Holders of a majority of the then
outstanding Registrable Securities; provided, however, that no such amendment
shall materially and adversely affect the rights of any Holder hereunder without
the consent of such Holder.

      Section 3.12 No Presumption. In the event any claim is made by a party
relating to any conflict, omission, or ambiguity in this Agreement, no
presumption or burden of proof or persuasion shall be implied by virtue of the
fact that this Agreement was prepared by or at the request of a particular party
or its counsel.

           [The remainder of this page is intentionally left blank.]

                                       16

<PAGE>

      IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first written above.

                            CROSSTEX, ENERGY, L.P.

                             By: Crosstex Energy GP, L.P. (its General Partner)

                             By: Crosstex Energy GP, LLC (its General Partner)

                             By: _______________________________________
                                       William W. Davis
                                       Executive Vice President and Chief
                                       Financial Officer

                [Signature Page to Registration Rights Agreement]

<PAGE>

                                   FIDUCIARY/CLAYMORE MLP
                                   OPPORTUNITY FUND

                                   By: _________________________________________
                                          James J. Cunnane, Jr.
                                          Managing Director and Senior Portfolio
                                             Manager

                [Signature Page to Registration Rights Agreement]

<PAGE>

                                   KAYNE ANDERSON MLP INVESTMENT
                                    COMPANY

                                   By: ________________________
                                          James C. Baker
                                          Vice President

                [Signature Page to Registration Rights Agreement]

<PAGE>

                                   KAYNE ANDERSON ENERGY TOTAL
                                    RETURN FUND, INC.

                                   By: ________________________
                                          James C. Baker
                                          Vice President

                [Signature Page to Registration Rights Agreement]

<PAGE>

                                   TORTOISE ENERGY CAPITAL CORPORATION

                                   By: ________________________
                                          David J. Schulte
                                          President

                [Signature Page to Registration Rights Agreement]

<PAGE>

                                   TORTOISE ENERGY INFRASTRUCTURE
                                    CORPORATION

                                   By: ________________________
                                          David J. Schulte
                                          President

                [Signature Page to Registration Rights Agreement]

<PAGE>

                                   SCHEDULE A

<TABLE>
<CAPTION>
                                                                             ALLOCATED
                    PURCHASER                          PURCHASED UNITS     PURCHASE PRICE
---------------------------------------------------    ---------------    ----------------
<S>                                                    <C>                <C>
Fiduciary/Claymore MLP Opportunity Fund............        407,167          15,000,032.28
Kayne Anderson MLP Investment Company..............      1,294,789          47,700,026.76
Kayne Anderson Energy Total Return Fund, Inc.......         62,432           2,299,994.88
Tortoise Energy Capital Corp.......................        977,199          36,000,011.16
Tortoise Energy Infrastructure Corporation.........        108,578           4,000,013.52
                                                         ---------        ---------------
     Total.........................................      2,850,165        $105,000,078.60
                                                         =========        ===============
</TABLE>

                                   Schedule A
<PAGE>

                 EXHIBIT B - FORM OF OPINION OF CROSSTEX COUNSEL

      Capitalized terms used but not defined herein have the meanings assigned
to such terms in the Senior Subordinated Series B Unit Purchase Agreement (the
"Purchase Agreement"). Crosstex shall furnish to the Purchasers at the Closing
an opinion of Baker Botts L.L.P., counsel for Crosstex, addressed to the
Purchasers and dated the Closing Date in form satisfactory to Vinson & Elkins
L.L.P., counsel for the Purchasers, stating that:

            (i) Each of Crosstex and its "significant subsidiaries" that are
organized under the laws of the States of Delaware or Texas (the "Crosstex
Subsidiaries," and, collectively with Crosstex, the "Crosstex Entities") has
been duly formed and is validly existing and in good standing under the laws of
the jurisdiction of its formation with all necessary, partnership or limited
liability company power and authority to own, lease, use or operate its
respective properties and to carry on its business as its business is now
conducted as described in Crosstex's Annual Report on Form 10-K for the period
ended December 31, 2004 (the "Annual Report") and Crosstex's Quarterly Reports
on Form 10-Q for the quarters ended March 31, 2005 and June 30, 2005 (each, a
"10-Q"). Each of the Crosstex Entities is duly qualified or registered for the
transaction of business and in good standing as a foreign limited partnership or
limited liability company, as applicable, in each of the jurisdictions set forth
in Exhibit A to such opinion.

            (ii) As of the date hereof, and prior to the sale and issuance of
the Purchased Units as contemplated by the Purchase Agreement, the issued and
outstanding limited partner interests of Crosstex consist of [_________] Common
Units, [__________] Subordinated Units, 1,495,410 Senior Subordinated Units and
the Incentive Distribution Rights, as defined in the Partnership Agreement. The
only issued and outstanding general partner interests of Crosstex are the
interests of the General Partners described in the Partnership Agreement. All
outstanding Common Units, Subordinated Units, Senior Subordinated Units and
Incentive Distribution Rights and the limited partner interests represented
thereby have been duly authorized and validly issued in accordance with the
Partnership Agreement and are fully paid (to the extent required under the
Partnership Agreement) and nonassessable (except as such nonassessability may be
affected by matters described in Sections 17-303 and 17-607 of the Delaware
Revised Uniform Limited Partnership Act ("Delaware LP Act")).

            (iii) To our knowledge, except as described in the Annual Report and
each 10-Q, and except for options granted pursuant to the Crosstex Energy GP,
LLC Long-Term Incentive Plan, there are no outstanding or authorized (i)
options, warrants, preemptive rights, subscriptions, calls, or other rights,
convertible or exchangeable securities, agreements, claims or commitments of any
character obligating any Crosstex Entity to issue, transfer or sell any
partnership interests or other equity interest in, any Crosstex Entity or
securities convertible into or exchangeable for such partnership interests, (ii)
obligations of any Crosstex Entity to repurchase, redeem or otherwise acquire
any partnership interests or equity interests of any Crosstex Entity or any such
securities or agreements listed in clause (i) of this sentence or (iii) voting
trusts or similar agreements to which any Crosstex Entity is a party with
respect to the voting of the equity interests of any Crosstex Entity. To our
knowledge, none of the offering or sale of the Purchased Units or the
registration of the Common Units underlying the Purchased Units pursuant to the
Registration Rights Agreement, all as contemplated by the Purchase

                               Exhibit B - Page 1
<PAGE>

Agreement, gives rise to any rights for or relating to the registration of any
Common Units or other securities of Crosstex other than those rights granted to
the General Partner or any of its Affiliates (as such term is defined in the
Partnership Agreement) under Section 7.12 of the Partnership Agreement.

            (iv) Crosstex owns of record, directly or indirectly, all of the
issued and outstanding equity interests of each of the Crosstex Subsidiaries,
free and clear of any Liens (A) in respect of which a financing statement under
the Uniform Commercial Code naming any of the Crosstex Entities as debtor is on
file in the office of the Secretary of State of Delaware or the office of the
Secretary of State of Texas, (B) otherwise known to us, without independent
investigation, other than those created by or arising under the Delaware LP Act,
the Texas Revised Limited Partnership Act (the "Texas LP Act") or the Delaware
Limited Liability Company Act (the "Delaware LLC Act"), or (C) except for such
Liens as may be imposed under the Senior Secured Credit Facility or the Crosstex
Master Shelf Agreement, and all such ownership interests have been duly
authorized, validly issued and are fully paid (to the extent required in the
organizational documents of the Crosstex Subsidiaries, as applicable) and
non-assessable (except as such nonassessability may be affected by matters
described in Sections 17-303 and 17-607 of the Delaware LP Act or Sections 3.03,
5.02 and 6.07 of the Texas LP Act, as applicable).

            (v) The Purchased Units to be issued and sold to the Purchasers by
Crosstex pursuant to the Purchase Agreement, and the limited partner interests
represented thereby, have been duly authorized under the Partnership Agreement
and when issued and delivered to the Purchasers against payment therefor in
accordance with the terms of the Purchase Agreement, will be validly issued,
fully paid (to the extent required by the Partnership Agreement) and
nonassessable (except as such nonassessability may be affected by matters
described in Sections 17-303 and 17-607 of the Delaware LP Act).

            (vi) None of the offering, issuance and sale by Crosstex of the
Purchased Units or the execution, delivery and performance of the Purchase
Agreement and Registration Rights Agreement (A) constitutes or will constitute a
violation of the Partnership Agreement or other organizational documents of any
of the Crosstex Entities, (B) constitutes or will constitute a breach or
violation of, or a default under (or an event which, with notice or lapse of
time or both, would constitute such an event), any agreement filed or
incorporated by reference as an exhibit to the Annual Report or (C) results or
will result in any violation of the Delaware LP Act, the Delaware LLC Act, or
U.S. federal law, which in the case of clauses (B) or (C) would be reasonably
likely to have a Crosstex Material Adverse Effect; provided, however, that no
opinion is expressed pursuant to this paragraph (vi) with respect to federal or
state securities or anti-fraud statutes, rules or regulations.

            (vii) Each of the Purchase Agreement, Registration Rights Agreement
and Partnership Agreement has been duly authorized and validly executed and
delivered on behalf of Crosstex or Crosstex Energy GP, L.P. party thereto, and
is enforceable against such entity except as the enforceability thereof may be
limited by (A) applicable bankruptcy, insolvency, fraudulent transfer,
reorganization, moratorium or similar laws from time to time in effect affecting
creditors' rights and remedies generally and by general principles of equity
(regardless of whether such principles are considered in a proceeding in equity
or at law) and (B) public policy,

                               Exhibit B - Page 2
<PAGE>

applicable law relating to fiduciary duties and indemnification and an implied
covenant of good faith and fair dealing.

            (viii) Except for the approvals required by the Commission in
connection with Crosstex's obligations under the Registration Rights Agreement,
no authorization, consent, approval, waiver, license, qualification or filing
with any U.S. federal or Delaware court, governmental agency or body having
jurisdiction over the Crosstex Entities or any of their respective properties is
required for the issuance and sale by Crosstex of the Purchased Units, the
execution, delivery and performance of each of the Purchase Agreement and
Registration Rights or the consummation of the transactions contemplated by the
Purchase Agreement and Registration Rights Agreement, except those that have
been obtained or as may be required under state securities or "Blue Sky" laws,
as to which we do not express any opinion.

            (ix) To our knowledge, there is no action, suit, proceeding or
investigation pending against the Crosstex Entities before any court or
governmental agency that questions the validity of the Purchase Agreement,
Partnership Agreement or the Registration Rights Agreement, or the right of
Crosstex to enter into any of the foregoing agreements.

            (x) Crosstex is not an "investment company" within the meaning of
the Investment Company Act of 1940, as amended.

            (xi) The Common Units issuable upon conversion of the Purchased
Units and the limited partner interests represented thereby have been duly
authorized by Crosstex pursuant to the Partnership Agreement and, upon issuance
in accordance with the terms of Senior Subordinated Series B Units and the
Partnership Agreement, will be validly issued, fully paid (to the extent
required by the Partnership Agreement) and nonassessable (except as such
nonassessability may be affected by matters described in Section 17-607 of the
Delaware LP Act).

                               Exhibit B - Page 3
<PAGE>

EXHIBIT C - FORM OF FOURTH AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP

                                  SEE ATTACHED

                                    Exhibit C
<PAGE>

                                                                       EXHIBIT C

================================================================================

                       FORM OF FOURTH AMENDED AND RESTATED

                        AGREEMENT OF LIMITED PARTNERSHIP

                                       OF

                              CROSSTEX ENERGY, L.P.

================================================================================

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<S>                                                                                                                     <C>
ARTICLE I DEFINITIONS............................................................................................        1

   SECTION 1.1       DEFINITIONS.................................................................................        1
   SECTION 1.2       CONSTRUCTION................................................................................       18

ARTICLE II ORGANIZATION..........................................................................................       18

   SECTION 2.1       FORMATION...................................................................................       18
   SECTION 2.2       NAME........................................................................................       19
   SECTION 2.3       REGISTERED OFFICE; REGISTERED AGENT; PRINCIPAL OFFICE; OTHER OFFICES........................       19
   SECTION 2.4       PURPOSE AND BUSINESS........................................................................       20
   SECTION 2.5       POWERS......................................................................................       20
   SECTION 2.6       POWER OF ATTORNEY...........................................................................       20
   SECTION 2.7       TERM........................................................................................       22
   SECTION 2.8       TITLE TO PARTNERSHIP ASSETS.................................................................       22

ARTICLE III RIGHTS OF LIMITED PARTNERS...........................................................................       22

   SECTION 3.1       LIMITATION OF LIABILITY.....................................................................       22
   SECTION 3.2       MANAGEMENT OF BUSINESS......................................................................       22
   SECTION 3.3       OUTSIDE ACTIVITIES OF THE LIMITED PARTNERS..................................................       23
   SECTION 3.4       RIGHTS OF LIMITED PARTNERS..................................................................       23

ARTICLE IV CERTIFICATES; RECORD HOLDERS; TRANSFER OF PARTNERSHIP INTERESTS; REDEMPTION OF PARTNERSHIP INTERESTS..       24

   SECTION 4.1       CERTIFICATES................................................................................       24
   SECTION 4.2       MUTILATED, DESTROYED, LOST OR STOLEN CERTIFICATES...........................................       24
   SECTION 4.3       RECORD HOLDERS..............................................................................       25
   SECTION 4.4       TRANSFER GENERALLY..........................................................................       26
   SECTION 4.5       REGISTRATION AND TRANSFER OF LIMITED PARTNER INTERESTS......................................       26
   SECTION 4.6       TRANSFER OF THE GENERAL PARTNER'S GENERAL PARTNER INTEREST..................................       27
   SECTION 4.7       TRANSFER OF INCENTIVE DISTRIBUTION RIGHTS...................................................       28
   SECTION 4.8       RESTRICTIONS ON TRANSFERS...................................................................       28
   SECTION 4.9       CITIZENSHIP CERTIFICATES; NON-CITIZEN ASSIGNEES.............................................       29
   SECTION 4.10      REDEMPTION OF PARTNERSHIP INTERESTS OF NON-CITIZEN ASSIGNEES................................       30

ARTICLE V CAPITAL CONTRIBUTIONS AND ISSUANCE OF PARTNERSHIP INTERESTS............................................       31

   SECTION 5.1       ORGANIZATIONAL CONTRIBUTIONS................................................................       31
   SECTION 5.2       CONTRIBUTIONS BY THE GENERAL PARTNER AND ITS AFFILIATES.....................................       31
   SECTION 5.3       CONTRIBUTIONS BY INITIAL LIMITED PARTNERS...................................................       32
   SECTION 5.4       INTEREST AND WITHDRAWAL.....................................................................       32
   SECTION 5.5       CAPITAL ACCOUNTS............................................................................       32
   SECTION 5.6       ISSUANCES OF ADDITIONAL PARTNERSHIP SECURITIES..............................................       37
   SECTION 5.7       LIMITATIONS ON ISSUANCE OF ADDITIONAL PARTNERSHIP SECURITIES................................       38
   SECTION 5.8       CONVERSION OF SENIOR SUBORDINATED UNITS.....................................................       41
   SECTION 5.9       CONVERSION OF SENIOR SUBORDINATED SERIES B UNITS............................................       41
   SECTION 5.10      CONVERSION OF SUBORDINATED UNITS............................................................       41
   SECTION 5.11      LIMITED PREEMPTIVE RIGHT....................................................................       42
   SECTION 5.12      SPLITS AND COMBINATIONS.....................................................................       43
   SECTION 5.13      FULLY PAID AND NON-ASSESSABLE NATURE OF LIMITED PARTNER INTERESTS...........................       44

ARTICLE VI ALLOCATIONS AND DISTRIBUTIONS.........................................................................       44

   SECTION 6.1       ALLOCATIONS FOR CAPITAL ACCOUNT PURPOSES....................................................       44
   SECTION 6.2       ALLOCATIONS FOR TAX PURPOSES................................................................       51
   SECTION 6.3       REQUIREMENT AND CHARACTERIZATION OF DISTRIBUTIONS; DISTRIBUTIONS TO RECORD HOLDERS..........       53
</TABLE>

<PAGE>

<TABLE>
<S>                                                                                                                     <C>
   SECTION 6.4       DISTRIBUTIONS OF AVAILABLE CASH FROM OPERATING SURPLUS......................................       54
   SECTION 6.5       DISTRIBUTIONS OF AVAILABLE CASH FROM CAPITAL SURPLUS........................................       55
   SECTION 6.6       ADJUSTMENT OF MINIMUM QUARTERLY DISTRIBUTION AND TARGET DISTRIBUTION LEVELS.................       56
   SECTION 6.7       SPECIAL PROVISIONS RELATING TO THE HOLDERS OF SENIOR SUBORDINATED UNITS.....................       56
   SECTION 6.8       SPECIAL PROVISIONS RELATING TO THE HOLDERS OF SENIOR SUBORDINATED SERIES B UNITS............       57
   SECTION 6.9       SPECIAL PROVISIONS RELATING TO THE HOLDERS OF SUBORDINATED UNITS............................       58
   SECTION 6.10      SPECIAL PROVISIONS RELATING TO THE HOLDERS OF INCENTIVE DISTRIBUTION RIGHTS.................       58
   SECTION 6.11      ENTITY-LEVEL TAXATION.......................................................................       59

ARTICLE VII MANAGEMENT AND OPERATION OF BUSINESS.................................................................       59

   SECTION 7.1       MANAGEMENT..................................................................................       59
   SECTION 7.2       CERTIFICATE OF LIMITED PARTNERSHIP..........................................................       61
   SECTION 7.3       RESTRICTIONS ON THE GENERAL PARTNER'S AUTHORITY.............................................       62
   SECTION 7.4       REIMBURSEMENT OF THE GENERAL PARTNER........................................................       63
   SECTION 7.5       OUTSIDE ACTIVITIES..........................................................................       63
   SECTION 7.6       LOANS FROM THE GENERAL PARTNER; LOANS OR CONTRIBUTIONS FROM THE PARTNERSHIP;
                     CONTRACTS WITH AFFILIATES; CERTAIN RESTRICTIONS ON THE GENERAL PARTNER......................       65
   SECTION 7.7       INDEMNIFICATION.............................................................................       66
   SECTION 7.8       LIABILITY OF INDEMNITEES....................................................................       68
   SECTION 7.9       RESOLUTION OF CONFLICTS OF INTEREST.........................................................       69
   SECTION 7.10      OTHER MATTERS CONCERNING THE GENERAL PARTNER................................................       70
   SECTION 7.11      PURCHASE OR SALE OF PARTNERSHIP SECURITIES..................................................       71
   SECTION 7.12      REGISTRATION RIGHTS OF THE GENERAL PARTNER AND ITS AFFILIATES...............................       71
   SECTION 7.13      RELIANCE BY THIRD PARTIES...................................................................       73

ARTICLE VIII BOOKS, RECORDS, ACCOUNTING AND REPORTS..............................................................       74

   SECTION 8.1       RECORDS AND ACCOUNTING......................................................................       74
   SECTION 8.2       FISCAL YEAR.................................................................................       74
   SECTION 8.3       REPORTS.....................................................................................       74

ARTICLE IX TAX MATTERS...........................................................................................       74

   SECTION 9.1       TAX RETURNS AND INFORMATION.................................................................       74
   SECTION 9.2       TAX ELECTIONS...............................................................................       75
   SECTION 9.3       TAX CONTROVERSIES...........................................................................       75
   SECTION 9.4       WITHHOLDING.................................................................................       75

ARTICLE X ADMISSION OF PARTNERS..................................................................................       76

   SECTION 10.1      ADMISSION OF INITIAL LIMITED PARTNERS.......................................................       76
   SECTION 10.2      ADMISSION OF SUBSTITUTED LIMITED PARTNER....................................................       76
   SECTION 10.3      ADMISSION OF SUCCESSOR GENERAL PARTNER......................................................       76
   SECTION 10.4      ADMISSION OF ADDITIONAL LIMITED PARTNERS....................................................       77
   SECTION 10.5      AMENDMENT OF AGREEMENT AND CERTIFICATE OF LIMITED PARTNERSHIP...............................       77

ARTICLE XI WITHDRAWAL OR REMOVAL OF PARTNERS.....................................................................       78

   SECTION 11.1      WITHDRAWAL OF THE GENERAL PARTNER...........................................................       78
   SECTION 11.2      REMOVAL OF THE GENERAL PARTNER..............................................................       79
   SECTION 11.3      INTEREST OF DEPARTING PARTNER AND SUCCESSOR GENERAL PARTNER.................................       80
   SECTION 11.4      TERMINATION OF SUBORDINATION PERIOD, CONVERSION OF SUBORDINATED UNITS AND
                     EXTINGUISHMENT OF CUMULATIVE COMMON UNIT ARREARAGES.........................................       81
   SECTION 11.5      WITHDRAWAL OF LIMITED PARTNERS..............................................................       81

ARTICLE XII DISSOLUTION AND LIQUIDATION..........................................................................       82

   SECTION 12.1      DISSOLUTION.................................................................................       82
   SECTION 12.2      CONTINUATION OF THE BUSINESS OF THE PARTNERSHIP AFTER DISSOLUTION...........................       82
   SECTION 12.3      LIQUIDATOR..................................................................................       83
   SECTION 12.4      LIQUIDATION.................................................................................       83
</TABLE>

                                       ii

<PAGE>

<TABLE>
<S>                                                                                                                     <C>
   SECTION 12.5      CANCELLATION OF CERTIFICATE OF LIMITED PARTNERSHIP..........................................       84
   SECTION 12.6      RETURN OF CONTRIBUTIONS.....................................................................       84
   SECTION 12.7      WAIVER OF PARTITION.........................................................................       85
   SECTION 12.8      CAPITAL ACCOUNT RESTORATION.................................................................       85

ARTICLE XIII AMENDMENT OF PARTNERSHIP AGREEMENT; MEETINGS; RECORD DATE...........................................       85

   SECTION 13.1      AMENDMENT TO BE ADOPTED SOLELY BY THE GENERAL PARTNER.......................................       85
   SECTION 13.2      AMENDMENT PROCEDURES........................................................................       86
   SECTION 13.3      AMENDMENT REQUIREMENTS......................................................................       87
   SECTION 13.4      SPECIAL MEETINGS............................................................................       87
   SECTION 13.5      NOTICE OF A MEETING.........................................................................       88
   SECTION 13.6      RECORD DATE.................................................................................       88
   SECTION 13.7      ADJOURNMENT.................................................................................       88
   SECTION 13.8      WAIVER OF NOTICE; APPROVAL OF MEETING; APPROVAL OF MINUTES..................................       88
   SECTION 13.9      QUORUM......................................................................................       89
   SECTION 13.10     CONDUCT OF A MEETING........................................................................       89
   SECTION 13.11     ACTION WITHOUT A MEETING....................................................................       90
   SECTION 13.12     VOTING AND OTHER RIGHTS.....................................................................       90

ARTICLE XIV MERGER...............................................................................................       91

   SECTION 14.1      AUTHORITY...................................................................................       91
   SECTION 14.2      PROCEDURE FOR MERGER OR CONSOLIDATION.......................................................       91
   SECTION 14.3      APPROVAL BY LIMITED PARTNERS OF MERGER OR CONSOLIDATION.....................................       92
   SECTION 14.4      CERTIFICATE OF MERGER.......................................................................       93
   SECTION 14.5      EFFECT OF MERGER............................................................................       93

ARTICLE XV RIGHT TO ACQUIRE LIMITED PARTNER INTERESTS............................................................       93

   SECTION 15.1      RIGHT TO ACQUIRE LIMITED PARTNER INTERESTS..................................................       93

ARTICLE XVI GENERAL PROVISIONS...................................................................................       95

   SECTION 16.1      ADDRESSES AND NOTICES.......................................................................       95
   SECTION 16.2      FURTHER ACTION..............................................................................       96
   SECTION 16.3      BINDING EFFECT..............................................................................       96
   SECTION 16.4      INTEGRATION.................................................................................       96
   SECTION 16.5      CREDITORS...................................................................................       96
   SECTION 16.6      WAIVER......................................................................................       96
   SECTION 16.7      COUNTERPARTS................................................................................       96
   SECTION 16.8      APPLICABLE LAW..............................................................................       96
   SECTION 16.9      INVALIDITY OF PROVISIONS....................................................................       97
   SECTION 16.10     CONSENT OF PARTNERS.........................................................................       97
</TABLE>

                                      iii

<PAGE>

                FOURTH AMENDED AND RESTATED AGREEMENT OF LIMITED
                      PARTNERSHIP OF CROSSTEX ENERGY, L.P.

         THIS FOURTH AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF
CROSSTEX ENERGY, L.P. dated as of __________, 2005, is entered into by and among
Crosstex Energy GP, L.P., a Delaware limited partnership, as the General
Partner, together with any other Persons who become Partners in the Partnership
or parties hereto as provided herein. In consideration of the covenants,
conditions and agreements contained herein, the parties hereto hereby agree as
follows:

                                    ARTICLE I

                                   DEFINITIONS

Section 1.1 Definitions.

      The following definitions shall be for all purposes, unless otherwise
clearly indicated to the contrary, applied to the terms used in this Agreement.

      "Acquisition" means any transaction in which any Group Member acquires
(through an asset acquisition, merger, stock acquisition or other form of
investment) control over all or a portion of the assets, properties or business
of another Person for the purpose of increasing the operating capacity or
revenues of the Partnership Group from the operating capacity or revenues of the
Partnership Group existing immediately prior to such transaction.

      "Additional Limited Partner" means a Person admitted to the Partnership as
a Limited Partner pursuant to Section 10.4 and who is shown as such on the books
and records of the Partnership.

      "Adjusted Capital Account" of a Partner means the Capital Account
maintained for such Partner adjusted as provided herein. The balance of an
Adjusted Capital Account at any time is the balance of the Capital Account at
such time (a) increased by any amounts that such Partner is obligated at such
time to restore under the standards set by Treasury Regulation Section
1.704-1(b)(2)(ii)(c) (or is deemed obligated to restore under Treasury
Regulation Sections 1.704-2(g) and 1.704-2(i)(5)) and (b) decreased by (i) the
amount of losses and deductions that are reasonably expected at such time to be
allocated to such Partner in subsequent taxable periods of the Partnership under
Sections 704(e)(2) and 706(d) of the Code and Treasury Regulation Section
1.751-1(b)(2)(ii), and (ii) the amount of all distributions that are reasonably
expected at such time to be made to such Partner in subsequent taxable periods
to the extent they exceed offsetting increases to such Partner's Capital Account
that are reasonably expected to occur during (or prior to) the taxable period in
which such distributions are reasonably expected to be made (other than
increases as a result of a minimum gain chargeback pursuant to Section 6.1(d)(i)
or 6.1(d)(ii)). The foregoing definition of Adjusted Capital Account is intended
to comply with the provisions of Treasury Regulation Section
1.704-1(b)(2)(ii)(d) and shall be interpreted consistently therewith. The
"Adjusted Capital Account" in respect of a General Partner Interest, a Common
Unit, a Senior Subordinated Unit, a Senior Subordinated Series B Unit, a
Subordinated Unit or an Incentive Distribution Right or any other Partnership
Interest

                                       1

<PAGE>

shall be the amount which the Adjusted Capital Account of a Partner would be if
such Partnership Interest were the only interest in the Partnership held by that
Partner from and after the date on which such Partnership Interest was first
issued.

      "Adjusted Operating Surplus" means, with respect to any period, Operating
Surplus generated during such period (a) less (i) any net increase in Working
Capital Borrowings with respect to such period and (ii) any net reduction in
cash reserves for Operating Expenditures with respect to such period not
relating to an Operating Expenditure made with respect to such period, and (b)
plus (i) any net decrease in Working Capital Borrowings with respect to such
period, and (ii) any net increase in cash reserves for Operating Expenditures
with respect to such period required by any debt instrument for the repayment of
principal, interest or premium. Adjusted Operating Surplus does not include that
portion of Operating Surplus included in clause (a)(i) of the definition of
Operating Surplus.

      "Affiliate" means, with respect to any Person, any other Person that
directly or indirectly through one or more intermediaries controls, is
controlled by or is under common control with, the Person in question. As used
herein, the term "control" means the possession, direct or indirect, of the
power to direct or cause the direction of the management and policies of a
Person, whether through ownership of voting securities, by contract or
otherwise.

      "Agreed Allocation" means any allocation, other than a Required
Allocation, of an item of income, gain, loss or deduction pursuant to the
provisions of Section 6.1.

      "Agreed Value" of any item of property means the fair market value of such
item of property as determined by the General Partner using such reasonable
method of valuation as it may adopt. The General Partner shall, in its
discretion, use such method as it deems reasonable and appropriate to allocate
the aggregate Agreed Value of one or more properties that are contributed to the
Partnership in a single or integrated transaction among each separate property
on a basis proportional to the fair market value of each such item of property.

      "Agreement" means this Fourth Amended and Restated Agreement of Limited
Partnership of Crosstex Energy, L.P., as it may be amended, supplemented or
restated from time to time.

      "Assignee" means a Non-citizen Assignee or a Person to whom one or more
Limited Partner Interests have been transferred in a manner permitted under this
Agreement and who has executed and delivered a Transfer Application as required
by this Agreement, but who has not been admitted as a Substituted Limited
Partner.

      "Associate" means, when used to indicate a relationship with any Person,
(a) any corporation or organization of which such Person is a director, officer
or partner or is, directly or indirectly, the owner of 20% or more of any class
of voting stock or other voting interest; (b) any trust or other estate in which
such Person has at least a 20% beneficial interest or as to which such Person
serves as trustee or in a similar fiduciary capacity; and (c) any relative or
spouse of such Person, or any relative of such spouse, who has the same
principal residence as such Person.

                                       2

<PAGE>

      "Available Cash" means, with respect to any Quarter ending prior to the
Liquidation Date:

            (a) the sum of (i) all cash and cash equivalents of the Partnership
Group on hand at the end of such Quarter, and (ii) all additional cash and cash
equivalents of the Partnership Group on hand on the date of determination of
Available Cash with respect to such Quarter resulting from Working Capital
Borrowings made subsequent to the end of such Quarter, less

            (b) the amount of any cash reserves that are necessary or
appropriate in the reasonable discretion of the General Partner to (i) provide
for the proper conduct of the business of the Partnership Group (including
reserves for future capital expenditures and for anticipated future credit needs
of the Partnership Group) subsequent to such Quarter, (ii) comply with
applicable law or any loan agreement, security agreement, mortgage, debt
instrument or other agreement or obligation to which any Group Member is a party
or by which it is bound or its assets are subject and (iii) provide funds for
distributions under Section 6.4 or 6.5 in respect of any one or more of the next
four Quarters; provided, however, that the General Partner may not establish
cash reserves pursuant to (iii) above if the effect of such reserves would be
that the Partnership is unable to distribute the Minimum Quarterly Distribution
on all Common Units, plus any Cumulative Common Unit Arrearage on all Common
Units, with respect to such Quarter; and, provided further, that disbursements
made by a Group Member or cash reserves established, increased or reduced after
the end of such Quarter but on or before the date of determination of Available
Cash with respect to such Quarter shall be deemed to have been made,
established, increased or reduced, for purposes of determining Available Cash,
within such Quarter if the General Partner so determines.

      Notwithstanding the foregoing, "Available Cash" with respect to the
Quarter in which the Liquidation Date occurs and any subsequent Quarter shall
equal zero.

      "Book-Down Event" means an event after which a negative adjustment is made
to the aggregate Carrying Values of the assets of the Partnership pursuant to
Section 5.5(d).

      "Book-Up Event" means an event after which a positive adjustment is made
to the aggregate Carrying Values of the assets of the Partnership pursuant to
Section 5.5(d).

      "Business Day" means Monday through Friday of each week, except that a
legal holiday recognized as such by the government of the United States of
America or the State of Texas shall not be regarded as a Business Day.

      "Capital Account" of a Partner is maintained as provided in Section 5.5.
The "Capital Account" in respect of a General Partner Interest, a Common Unit, a
Senior Subordinated Unit, a Senior Subordinated Series B Unit, a Subordinated
Unit, an Incentive Distribution Right or other Partnership Interest is the
Capital Account that would be maintained if such Partnership Interest were the
only interest in the Partnership held by a Partner from and after the date on
which such Partnership Interest was first issued.

                                       3

<PAGE>

      "Capital Contribution" means any cash, cash equivalents or the Net Agreed
Value of Contributed Property that a Partner contributes to the Partnership
pursuant to this Agreement or the Contribution Agreements.

      "Capital Improvement" means any (a) addition or improvement to the capital
assets owned by any Group Member or (b) acquisition of existing, or the
construction of new, capital assets (including, without limitation, natural gas
gathering or transmission pipelines and natural gas treating or processing
plants and natural gas liquids pipelines, fractionation plants and storage and
distribution facilities and related assets), in each case if such addition,
improvement, acquisition or construction is made to increase the operating
capacity or revenues of the Partnership Group from the operating capacity or
revenues of the Partnership Group existing immediately prior to such addition,
improvement, acquisition or construction.

      "Capital Surplus" has the meaning assigned to such term in Section 6.3(a).

      "Carrying Value" of an item of Partnership property immediately after the
Closing Date is the fair market value of such item of Partnership property as
determined by the General Partner using such reasonable method of valuation as
it may adopt. For purposes hereof, the Partnership shall be treated as owning
directly its share (as determined by the General Partner) of all property owned
by the Operating Partnership or any other Subsidiary that is classified as a
partnership or is disregarded for federal income tax purposes. The Carrying
Value of any item of Partnership property shall be adjusted from time to time as
provided in Section 5.5(b) and Section 5.5(d). The Carrying Value of an item of
property that is acquired by the Partnership after the Closing Date shall be the
amount that would be the adjusted basis for federal income tax purposes of such
property in the hands of the Partnership immediately after its acquisition if
the adjusted basis for federal income tax purposes of each asset of the
Partnership at that time were equal to its Carrying Value at that time.

      "Cause" means a court of competent jurisdiction has entered a final,
non-appealable judgment finding the General Partner liable for actual fraud,
gross negligence or willful or wanton misconduct in its capacity as a general
partner of the Partnership.

      "Certificate" means a certificate (i) substantially in the form of Exhibit
A to this Agreement, (ii) issued in global form in accordance with the rules and
regulations of the Depositary or (iii) in such other form as may be adopted by
the General Partner in its discretion, issued by the Partnership evidencing
ownership of one or more Common Units or a certificate, in such form as may be
adopted by the General Partner in its discretion, issued by the Partnership
evidencing ownership of one or more other Partnership Securities.

      "Certificate of Limited Partnership" means the Certificate of Limited
Partnership of the Partnership filed with the Secretary of State of the State of
Delaware as referenced in Section 2.1, as such Certificate of Limited
Partnership may be amended, supplemented or restated from time to time.

      "Citizenship Certification" means a properly completed certificate in such
form as may be specified by the General Partner by which an Assignee or a
Limited Partner certifies that he

                                       4

<PAGE>

(and if he is a nominee holding for the account of another Person, that to the
best of his knowledge such other Person) is an Eligible Citizen.

      "Claim" as used in Section 7.12 has the meaning assigned to such term in
Section 7.12(c).

      "Closing Contribution Agreement" means that certain Contribution,
Conveyance and Assumption Agreement, dated as of the Closing Date, among the
General Partner, the Partnership, the Operating Partnership, Crosstex Energy,
Inc. and certain other parties, together with the additional conveyance
documents and instruments contemplated or referenced thereunder.

      "Closing Date" means the first date on which Common Units are sold by the
Partnership to the Underwriters pursuant to the provisions of the Underwriting
Agreement.

      "Closing Price" has the meaning assigned to such term in Section 15.1(a).

      "Code" means the Internal Revenue Code of 1986, as amended and in effect
from time to time. Any reference herein to a specific section or sections of the
Code shall be deemed to include a reference to any corresponding provision of
any successor law.

      "Combined Interest" has the meaning assigned to such term in Section
11.3(a).

      "Commission" means the United States Securities and Exchange Commission.

      "Common Unit" means a Partnership Security representing a fractional part
of the Partnership Interests of all Limited Partners and Assignees, and having
the rights and obligations specified with respect to Common Units in this
Agreement. The term "Common Unit" does not refer to a Senior Subordinated Unit,
a Senior Subordinated Series B Unit or a Subordinated Unit prior to its
conversion into a Common Unit pursuant to the terms hereof.

      "Common Unit Arrearage" means, with respect to any Common Unit, whenever
issued, as to any Quarter within the Subordination Period, the excess, if any,
of (a) the Minimum Quarterly Distribution with respect to a Common Unit in
respect of such Quarter over (b) the sum of all Available Cash distributed with
respect to a Common Unit in respect of such Quarter pursuant to Section
6.4(a)(i).

      "Conflicts Committee" means a committee of the Board of Directors of the
General Partner composed entirely of two or more directors who are not (a)
security holders, officers or employees of the General Partner, (b) officers,
directors or employees of any Affiliate of the General Partner or (c) holders of
any ownership interest in the Partnership Group other than Common Units and who
also meet the independence standards required of directors who serve on an audit
committee of a board of directors established by the National Securities
Exchange on which the Common Units are listed for trading.

      "Contributed Property" means each property or other asset, in such form as
may be permitted by the Delaware Act, but excluding cash, contributed to the
Partnership.

                                       5

<PAGE>

      "Contribution Agreements" mean, collectively, the First Contribution
Agreement and the Closing Contribution Agreement.

      "Corrective Allocation" means any allocation of an item of income, gain,
loss, deduction or credit pursuant to Section 6.1(d)(xi).

      "Crosstex Energy, Inc." means Crosstex Energy, Inc., a Delaware
corporation formerly named of Crosstex Energy Holdings Inc.

      "Crosstex GP" means Crosstex Energy GP, LLC, a Delaware limited liability
company and the general partner of the General Partner.

      "Crosstex Texas Inc." means Crosstex Energy Inc., a Texas corporation and
former wholly-owned subsidiary of Crosstex Energy, Inc., a Delaware corporation,
which subsequent to the Closing Date, was merged with and into Crosstex Energy,
Inc.

      "Cumulative Common Unit Arrearage" means, with respect to any Common Unit,
whenever issued, and as of the end of any Quarter, the excess, if any, of (a)
the sum resulting from adding together the Common Unit Arrearage as to an
Initial Common Unit for each of the Quarters within the Subordination Period
ending on or before the last day of such Quarter over (b) the sum of any
distributions theretofore made pursuant to Section 6.4(a)(ii) and the second
sentence of Section 6.5 with respect to an Initial Common Unit (including any
distributions to be made in respect of the last of such Quarters).

      "Curative Allocation" means any allocation of an item of income, gain,
deduction, loss or credit pursuant to Section 6.1(d)(x).

      "Current Market Price" has the meaning assigned to such term in Section
15.1(a).

      "Delaware Act" means the Delaware Revised Uniform Limited Partnership Act,
6 Del C. Section 17-101, et seq., as amended, supplemented or restated from time
to time, and any successor to such statute.

      "Departing Partner" means a former General Partner from and after the
effective date of any withdrawal or removal of such former General Partner
pursuant to Section 11.1 or 11.2.

      "Depositary" means, with respect to any Units issued in global form, The
Depository Trust Company and its successors and permitted assigns.

      "Economic Risk of Loss" has the meaning set forth in Treasury Regulation
Section 1.752-2(a).

      "Eligible Citizen" means a Person qualified to own interests in real
property in jurisdictions in which any Group Member does business or proposes to
do business from time to time, and whose status as a Limited Partner or Assignee
does not or would not subject such Group Member to a significant risk of
cancellation or forfeiture of any of its properties or any interest therein.

                                       6

<PAGE>

      "Event of Withdrawal" has the meaning assigned to such term in Section
11.1(a).

      "Final Subordinated Units" has the meaning assigned to such term in
Section 6.1(d)(ix)(A).

      "First Contribution Agreement" means that certain Contribution, Conveyance
and Assumption Agreement, dated as of November 27, 2002, among the General
Partner, the Partnership, the Operating Partnership, Crosstex Energy, Inc. and
certain other parties, together with the additional conveyance documents and
instruments contemplated or referenced thereunder.

      "First Liquidation Target Amount" has the meaning assigned to such term in
Section 6.1(c)(i)(D).

      "First Target Distribution" means $0.3125 per Unit per Quarter (or, with
respect to the period commencing on the Closing Date and ending on March 31,
2003, it means the product of $0.3125 multiplied by a fraction of which the
numerator is the number of days in such period, and of which the denominator is
90), subject to adjustment in accordance with Sections 6.6 and 6.11.

      "Fully Diluted Basis" means, when calculating the number of Outstanding
Units for any period, a basis that includes, in addition to the Outstanding
Units, all Partnership Securities and options, rights, warrants and appreciation
rights relating to an equity interest in the Partnership (a) that are
convertible into or exercisable or exchangeable for Units that are senior to or
pari passu with the Subordinated Units, (b) whose conversion, exercise or
exchange price is less than the Current Market Price on the date of such
calculation, and (c) that may be converted into or exercised or exchanged for
such Units prior to or during the Quarter following the end of the last Quarter
contained in the period for which the calculation is being made without the
satisfaction of any contingency beyond the control of the holder other than the
payment of consideration and the compliance with administrative mechanics
applicable to such conversion, exercise or exchange; provided that for purposes
of determining the number of Outstanding Units on a Fully Diluted Basis when
calculating whether the Subordination Period has ended or Subordinated Units are
entitled to convert into Common Units pursuant to Section 5.10, such Partnership
Securities, options, rights, warrants and appreciation rights shall be deemed to
have been Outstanding Units only for the four Quarters that comprise the last
four Quarters of the measurement period; provided, further, that if
consideration will be paid to any Group Member in connection with such
conversion, exercise or exchange, the number of Units to be included in such
calculation shall be that number equal to the difference between (i) the number
of Units issuable upon such conversion, exercise or exchange and (ii) the number
of Units which such consideration would purchase at the Current Market Price.

      "General Partner" means Crosstex Energy GP, L.P. and its successors and
permitted assigns as general partner of the Partnership.

      "General Partner Interest" means the ownership interest of the General
Partner in the Partnership (in its capacity as a general partner without
reference to any Limited Partner Interest held by it), which may be evidenced by
Partnership Securities or a combination thereof or

                                       7

<PAGE>

interest therein, and includes any and all benefits to which the General Partner
is entitled as provided in this Agreement, together with all obligations of the
General Partner to comply with the terms and provisions of this Agreement.

      "Group" means a Person that with or through any of its Affiliates or
Associates has any agreement, arrangement or understanding for the purpose of
acquiring, holding, voting (except voting pursuant to a revocable proxy or
consent given to such Person in response to a proxy or consent solicitation made
to 10 or more Persons) or disposing of any Partnership Securities with any other
Person that beneficially owns, or whose Affiliates or Associates beneficially
own, directly or indirectly, Partnership Securities.

      "Group Member" means a member of the Partnership Group.

      "Holder" as used in Section 7.12, has the meaning assigned to such term in
Section 7.12(a).

      "Incentive Distribution Right" means a non-voting Limited Partner Interest
issued to the General Partner pursuant to Section 5.2, which Partnership
Interest will confer upon the holder thereof only the rights and obligations
specifically provided in this Agreement with respect to Incentive Distribution
Rights (and no other rights otherwise available to or other obligations of a
holder of a Partnership Interest). Notwithstanding anything in this Agreement to
the contrary, the holder of an Incentive Distribution Right shall not be
entitled to vote such Incentive Distribution Right on any Partnership matter
except as may otherwise be required by law.

      "Incentive Distributions" means any amount of cash distributed to the
holders of the Incentive Distribution Rights pursuant to Section 6.4 or any
other provision of this Agreement.

      "Indemnified Persons" has the meaning assigned to such term in Section
7.12(c).

      "Indemnitee" means (a) the General Partner, (b) any Departing Partner, (c)
any Person who is or was an Affiliate of the General Partner or any Departing
Partner, (d) any Person who is or was a member, partner, officer, director,
employee, agent, fiduciary or trustee of any Group Member, the General Partner
or any Departing Partner or any Affiliate of any Group Member, the General
Partner or any Departing Partner, and (e) any Person who is or was serving at
the request of the General Partner or any Departing Partner or any Affiliate of
the General Partner or any Departing Partner as an officer, director, employee,
member, partner, agent, fiduciary or trustee of another Person; provided, that a
Person shall not be an Indemnitee by reason of providing, on a fee-for-services
basis, trustee, fiduciary or custodial services.

      "Initial Common Units" means the Common Units sold in the Initial
Offering.

      "Initial Limited Partners" means Crosstex Energy, Inc. and the
Underwriters, in each case upon being admitted to the Partnership in accordance
with Section 10.1.

      "Initial Offering" means the initial offering and sale of Common Units to
the public, as described in the Registration Statement.

                                       8

<PAGE>

      "Initial Unit Price" means (a) with respect to the Common Units and the
Subordinated Units, the initial public offering price per Common Unit at which
the Underwriters offered the Common Units to the public for sale as set forth on
the cover page of the prospectus included as part of the Registration Statement
and first issued at or after the time the Registration Statement first became
effective multiplied (in order to give effect to the Unit Split) by 50 percent,
(b) with respect to the Senior Subordinated Units, $37.4545 per unit, (c) with
respect to the Senior Subordinated Series B Units, $____ per unit, or (d) with
respect to any other class or series of Units, the price per Unit at which such
class or series of Units is initially sold by the Partnership, as determined by
the General Partner, in each case adjusted as the General Partner determines to
be appropriate to give effect to any distribution, subdivision or combination of
Units.

      "Interim Capital Transactions" means the following transactions if they
occur prior to the Liquidation Date: (a) borrowings, refinancings or refundings
of indebtedness and sales of debt securities (other than Working Capital
Borrowings and other than for items purchased on open account in the ordinary
course of business) by any Group Member; (b) sales of equity interests by any
Group Member (including the Common Units sold to the Underwriters pursuant to
the exercise of the Over-Allotment Option); and (c) sales or other voluntary or
involuntary dispositions of any assets of any Group Member other than (i) sales
or other dispositions of inventory, accounts receivable and other assets in the
ordinary course of business, and (ii) sales or other dispositions of assets as
part of normal retirements or replacements.

      "Issue Price" means the price at which a Unit is purchased from the
Partnership, after taking into account any sales commission or underwriting
discount charged to the Partnership. In the case of the Senior Subordinated
Units, the Issue Price shall be deemed to be $33.4356 per unit and in the case
of the Senior Subordinated Series B Units, the Issue Price shall be deemed to be
$______ per unit.

      "Limited Partner" means, unless the context otherwise requires, (a) the
Organizational Limited Partner prior to its withdrawal from the Partnership,
each Initial Limited Partner, each Substituted Limited Partner, each Additional
Limited Partner and any Departing Partner upon the change of its status from
General Partner to Limited Partner pursuant to Section 11.3 or (b) solely for
purposes of Articles V, VI, VII and IX, each Assignee; provided, however, that
when the term "Limited Partner" is used herein in the context of any vote or
other approval, including without limitation Articles XIII and XIV, such term
shall not, solely for such purpose, include any holder of an Incentive
Distribution Right except as may otherwise be required by law.

      "Limited Partner Interest" means the ownership interest of a Limited
Partner or Assignee in the Partnership, which may be evidenced by Common Units,
Senior Subordinated Units, Senior Subordinated Series B Units, Subordinated
Units, Incentive Distribution Rights or other Partnership Securities or a
combination thereof or interest therein, and includes any and all benefits to
which such Limited Partner or Assignee is entitled as provided in this
Agreement, together with all obligations of such Limited Partner or Assignee to
comply with the terms and provisions of this Agreement; provided, however, that
when the term "Limited Partner Interest" is used herein in the context of any
vote or other approval, including without limitation Articles XIII and XIV, such
term shall not, solely for such purpose, include any holder of an Incentive
Distribution Right except as may otherwise be required by law.

                                       9

<PAGE>

      "Liquidation Date" means (a) in the case of an event giving rise to the
dissolution of the Partnership of the type described in clauses (a) and (b) of
the first sentence of Section 12.2, the date on which the applicable time period
during which the holders of Outstanding Units have the right to elect to
reconstitute the Partnership and continue its business has expired without such
an election being made, and (b) in the case of any other event giving rise to
the dissolution of the Partnership, the date on which such event occurs.

      "Liquidator" means one or more Persons selected by the General Partner to
perform the functions described in Section 12.3 as liquidating trustee of the
Partnership within the meaning of the Delaware Act.

      "Merger Agreement" has the meaning assigned to such term in Section 14.1.

      "Minimum Quarterly Distribution" means $0.25 per Unit per Quarter (or with
respect to the period commencing on the Closing Date and ending on March 31,
2003, it means the product of $0.25 multiplied by a fraction of which the
numerator is the number of days in such period and of which the denominator is
90), subject to adjustment in accordance with Sections 6.6 and 6.11.

      "National Securities Exchange" means an exchange registered with the
Commission under Section 6(a) of the Securities Exchange Act of 1934, as
amended, supplemented or restated from time to time, and any successor to such
statute, or the Nasdaq Stock Market or any successor thereto.

      "Net Agreed Value" means (a) in the case of any Contributed Property, the
Agreed Value of such property reduced by any liabilities either assumed by the
Partnership upon such contribution or to which such property is subject when
contributed and (b) in the case of any property distributed by the Partnership,
the Partnership's Carrying Value in such property assuming that the adjustment
permitted by Section 5.5(d)(ii) is made immediately before the time such
property is distributed, reduced by any indebtedness either assumed by the
distributee or to which such property is subject at the time of distribution, in
either case, as determined under Section 752 of the Code.

      "Net Income" for any taxable period of the Partnership means the sum, if
positive, of all items of income, gain, loss and deduction that are recognized
by the Partnership during such taxable period and on or before the Liquidation
Date. The items included in the calculation of Net Income shall be determined in
accordance with Section 5.5(b) but shall not include any items allocated under
Section 6.1(d).

      "Net Loss" for any taxable period of the Partnership means the sum, if
negative, of all items of income, gain, loss or deduction that are recognized by
the Partnership during such taxable period of the Partnership and on or before
the Liquidation Date. The items included in the calculation of Net Loss shall be
determined in accordance with Section 5.5(b) but shall not include any items
allocated under Section 6.1(d).

      "Net Termination Gain" for any taxable period of the Partnership means the
sum, if positive, of all items of income, gain, loss or deduction recognized by
the Partnership during such taxable period of the Partnership and after the
Liquidation Date. The items included in the

                                       10

<PAGE>

determination of Net Termination Gain shall be determined in accordance with
Section 5.5(b) but shall not include any items that are allocated under Section
6.1(d).

      "Net Termination Loss" for any taxable period of the Partnership means the
sum, if negative, of all items of income, gain, loss or deduction recognized by
the Partnership during such taxable period of the Partnership and after the
Liquidation Date. The items included in the determination of Net Termination
Loss shall be determined in accordance with Section 5.5(b) but shall not include
any items that are allocated under Section 6.1(d).

      "Non-citizen Assignee" means a Person whom the General Partner has
determined in its discretion does not constitute an Eligible Citizen and as to
whose Partnership Interest the General Partner has become the Substituted
Limited Partner pursuant to Section 4.9.

      "Nonrecourse Deductions" means any and all items of loss, deduction or
expenditure (including, without limitation, any expenditure described in Section
705(a)(2)(B) of the Code) that, in accordance with the principles of Treasury
Regulation Section 1.704-2(b), are attributable to a Nonrecourse Liability.

      "Nonrecourse Liability" has the meaning set forth in Treasury Regulation
Section 1.752-1(a)(2).

      "Notice of Election to Purchase" has the meaning assigned to such term in
Section 15.1(b).

      "Omnibus Agreement" means that Omnibus Agreement, dated as of the Closing
Date, among Crosstex Energy, Inc., the General Partner, Crosstex GP, the
Partnership and the Operating Partnership.

      "Operating Expenditures" means all Partnership Group expenditures,
including, but not limited to, taxes, reimbursements of the General Partner,
repayment of Working Capital Borrowings, debt service payments and capital
expenditures, subject to the following:

            (a) Payments (including prepayments) of principal of and premium on
indebtedness other than Working Capital Borrowings shall not constitute
Operating Expenditures; and

            (b) Operating Expenditures shall not include (i) capital
expenditures made for Acquisitions or for Capital Improvements, (ii) payment of
transaction expenses relating to Interim Capital Transactions or (iii)
distributions to Partners. Where capital expenditures are made in part for
Acquisitions or for Capital Improvements and in part for other purposes, the
General Partner's good faith allocation between the amounts paid for each shall
be conclusive.

      "Operating Partnership" means Crosstex Energy Services, L.P., a Delaware
limited partnership, and any successors thereto.

      "Operating Partnership Agreement" means the Amended and Restated Agreement
of Limited Partnership of the Operating Partnership, as it may be amended,
supplemented or restated from time to time.

                                       11

<PAGE>

      "Operating Surplus" means, with respect to any period ending prior to the
Liquidation Date, on a cumulative basis and without duplication,

            (a) the sum of (i) $8.9 million plus all cash and cash equivalents
of the Partnership Group on hand as of the close of business on the Closing
Date, (ii) all cash receipts of the Partnership Group for the period beginning
on the Closing Date and ending with the last day of such period, other than cash
receipts from Interim Capital Transactions (except to the extent specified in
Section 6.5) and (iii) all cash receipts of the Partnership Group after the end
of such period but on or before the date of determination of Operating Surplus
with respect to such period resulting from Working Capital Borrowings, less

            (b) the sum of (i) Operating Expenditures for the period beginning
on the Closing Date and ending on the last day of such period and (ii) the
amount of cash reserves that is necessary or advisable in the reasonable
discretion of the General Partner to provide funds for future Operating
Expenditures; provided, however, that disbursements made (including
contributions to a Group Member or disbursements on behalf of a Group Member) or
cash reserves established, increased or reduced after the end of such period but
on or before the date of determination of Available Cash with respect to such
period shall be deemed to have been made, established, increased or reduced, for
purposes of determining Operating Surplus, within such period if the General
Partner so determines.

      Notwithstanding the foregoing, "Operating Surplus" with respect to the
Quarter in which the Liquidation Date occurs and any subsequent Quarter shall
equal zero.

      "Opinion of Counsel" means a written opinion of counsel (who may be
regular counsel to the Partnership or the General Partner or any of its
Affiliates) acceptable to the General Partner in its reasonable discretion.

      "Option Closing Date" means the date or dates on which any Common Units
are sold by the Partnership to the Underwriters upon exercise of the
Over-Allotment Option.

      "Organizational Limited Partner" means Crosstex Energy, Inc. in its
capacity as the organizational limited partner of the Partnership pursuant to
this Agreement.

      "Outstanding" means, with respect to Partnership Securities, all
Partnership Securities that are issued by the Partnership and reflected as
outstanding on the Partnership's books and records as of the date of
determination; provided, however, that if at any time any Person or Group (other
than the General Partner or its Affiliates) beneficially owns 20% or more of any
Outstanding Partnership Securities of any class then Outstanding, all
Partnership Securities owned by such Person or Group shall not be voted on any
matter and shall not be considered to be Outstanding when sending notices of a
meeting of Limited Partners to vote on any matter (unless otherwise required by
law), calculating required votes, determining the presence of a quorum or for
other similar purposes under this Agreement, except that Common Units so owned
shall be considered to be Outstanding for purposes of Section 11.1(b)(iv) (such
Common Units shall not, however, be treated as a separate class of Partnership
Securities for purposes of this Agreement); provided, further, that the
foregoing limitation shall not apply (i) to any Person or Group who acquired 20%
or more of any Outstanding Partnership Securities of any class then Outstanding
directly from the General Partner or its Affiliates, (ii) to any Person or Group
who acquired 20% or more of any Outstanding Partnership Securities of any class
then

                                       12

<PAGE>

Outstanding directly or indirectly from a Person or Group described in clause
(i) provided that the General Partner shall have notified such Person or Group
in writing that such limitation shall not apply, or (iii) to any Person or Group
who acquired 20% or more of any Partnership Securities issued by the Partnership
with the prior approval of the board of directors of the General Partner.

      "Over-Allotment Option" means the over-allotment option granted to the
Underwriters by the Partnership pursuant to the Underwriting Agreement.

      "Parity Units" means Common Units and all other Units of any other class
or series that have the right (i) to receive distributions of Available Cash
from Operating Surplus pursuant to each of subclauses (a)(i) and (a)(ii) of
Section 6.4 in the same order of priority with respect to the participation of
Common Units in such distributions or (ii) to participate in allocations of Net
Termination Gain pursuant to Section 6.1(c)(i)(B) in the same order of priority
with the Common Units, in each case regardless of whether the amounts or value
so distributed or allocated on each Parity Unit equals the amount or value so
distributed or allocated on each Common Unit. Units whose participation in such
(i) distributions of Available Cash from Operating Surplus and (ii) allocations
of Net Termination Gain are subordinate in order of priority to such
distributions and allocations on Common Units shall not constitute Parity Units
even if such Units are convertible under certain circumstances into Common Units
or Parity Units.

      "Partner Nonrecourse Debt" has the meaning set forth in Treasury
Regulation Section 1.704-2(b)(4).

      "Partner Nonrecourse Debt Minimum Gain" has the meaning set forth in
Treasury Regulation Section 1.704-2(i)(2).

      "Partner Nonrecourse Deductions" means any and all items of loss or
deduction determined in accordance with Section 5.5(b) that, in accordance with
the principles of Treasury Regulation Section 1.704-2(i), are attributable to a
Partner Nonrecourse Debt.

      "Partners" means the General Partner and the Limited Partners.

      "Partnership" means Crosstex Energy, L.P., a Delaware limited partnership,
and any successors thereto.

      "Partnership Group" means the Partnership, the Operating Partnership and
any Subsidiary of any such entity, treated as a single consolidated entity.

      "Partnership Interest" means an interest in the Partnership, which shall
include the General Partner Interest and Limited Partner Interests.

      "Partnership Minimum Gain" means that amount determined in accordance with
the principles of Treasury Regulation Section 1.704-2(d).

      "Partnership Security" means any class or series of equity interest in the
Partnership (but excluding any options, rights, warrants and appreciation rights
relating to an equity interest in the

                                       13

<PAGE>

Partnership), including without limitation, Common Units, Senior Subordinated
Units, Senior Subordinated Series B Units, Subordinated Units and Incentive
Distribution Rights.

      "Percentage Interest" means as of any date of determination (a) as to the
General Partner (in its capacity as General Partner without reference to any
Limited Partner Interests held by it), 2%, (b) as to any Unitholder or Assignee
holding Units, the product obtained by multiplying (i) 98% less the percentage
applicable to paragraph (c) by (ii) the quotient obtained by dividing (A) the
number of Units held by such Unitholder or Assignee by (B) the total number of
all Outstanding Units, and (c) as to the holders of additional Partnership
Securities issued by the Partnership in accordance with Section 5.6, the number
of Units to which such Partnership Securities are equivalent for the purpose of
determining Percentage Interest (and only for such purpose) as determined by the
General Partner as a part of such issuance. The Percentage Interest with respect
to an Incentive Distribution Right shall at all times be zero.

      "Person" means an individual or a corporation, limited liability company,
partnership, joint venture, trust, unincorporated organization, association,
government agency or political subdivision thereof or other entity.

      "Per Unit Capital Amount" means, as of any date of determination, the
Capital Account, stated on a per Unit basis, underlying any Unit held by a
Person other than the General Partner or any Affiliate of the General Partner
who holds Units.

      "Pro Rata" means (a) when modifying Units or any class thereof,
apportioned equally among all designated Units in accordance with their relative
Percentage Interests, (b) when modifying Partners and Assignees, apportioned
among all Partners and Assignees in accordance with their relative Percentage
Interests and (c) when modifying holders of Incentive Distribution Rights,
apportioned equally among all holders of Incentive Distribution Rights in
accordance with the relative number of Incentive Distribution Rights held by
each such holder.

      "Purchase Date" means the date determined by the General Partner as the
date for purchase of all Outstanding Units of a certain class (other than Units
owned by the General Partner and its Affiliates) pursuant to Article XV.

      "Quarter" means, unless the context requires otherwise, a fiscal quarter,
or, with respect to the first fiscal quarter after the Closing Date, the portion
of such fiscal quarter after the Closing Date, of the Partnership.

      "Recapture Income" means any gain recognized by the Partnership for
federal income tax purposes (computed without regard to any adjustment required
by Section 734 or Section 743 of the Code) upon the disposition of any property
of the Partnership, which gain is characterized as ordinary income for federal
income tax purposes because it represents the recapture of deductions previously
taken with respect to such property.

      "Record Date" means the date established by the General Partner for
determining (a) the identity of the Record Holders entitled to notice of, or to
vote at, any meeting of Limited Partners or entitled to vote by ballot or give
approval of Partnership action in writing without a meeting or entitled to
exercise rights in respect of any lawful action of Limited Partners or (b) the
identity of Record Holders entitled to receive any report or distribution or to
participate in any offer.

                                       14

<PAGE>

      "Record Holder" means the Person in whose name a Common Unit is registered
on the books of the Transfer Agent as of the opening of business on a particular
Business Day, or with respect to other Partnership Securities, the Person in
whose name any such other Partnership Security is registered on the books which
the General Partner has caused to be kept as of the opening of business on such
Business Day.

      "Redeemable Interests" means any Partnership Interests for which a
redemption notice has been given, and has not been withdrawn, pursuant to
Section 4.10.

      "Registration Statement" means the Registration Statement on Form S-1
(Registration No. 333-97779) as it has been or as it may be amended or
supplemented from time to time, filed by the Partnership with the Commission
under the Securities Act to register the offering and sale of the Common Units
in the Initial Offering.

      "Required Allocations" means (a) any limitation imposed on the allocation
of Net Losses or Net Termination Losses under Section 6.1(b) or 6.1(c) that is
identified therein as a Required Allocation and (b) any allocation of an item of
income, gain, loss or deduction pursuant to Section 6.1(d) that is identified
therein as a Required Allocation.

      "Restricted Business" has the meaning assigned to such term in the Omnibus
Agreement.

      "Second Target Distribution" means $0.375 per Unit per Quarter (or, with
respect to the period commencing on the Closing Date and ending on March 31,
2003, it means the product of $0.375 multiplied by a fraction of which the
numerator is equal to the number of days in such period and of which the
denominator is 90), subject to adjustment in accordance with Sections 6.6 and
6.11.

      "Securities Act" means the Securities Act of 1933, as amended,
supplemented or restated from time to time and any successor to such statute.

      "Senior Subordinated Series B Unit" means a Unit representing a fractional
part of the Partnership Interests of all Limited Partners and Assignees and
having the rights and obligations specified with respect to Senior Subordinated
Series B Units in this Agreement. The term "Senior Subordinated Series B Unit"
as used herein does not include a Common Unit, a Parity Unit, a Subordinated
Unit or a Senior Subordinated Unit. A Senior Subordinated Series B Unit shall
not constitute a Common Unit or Parity Unit until it converts into a Common
Unit.

      "Senior Subordinated Unit" means a Unit representing a fractional part of
the Partnership Interests of all Limited Partners and Assignees and having the
rights and obligations specified with respect to Senior Subordinated Units in
this Agreement. The term "Senior Subordinated Unit" as used herein does not
include a Common Unit, a Parity Unit, a Subordinated Unit or a Senior
Subordinated Series B Unit. A Senior Subordinated Unit shall not constitute a
Common Unit or Parity Unit until it converts into a Common Unit.

      "Special Approval" means approval by a majority of the members of the
Conflicts Committee.

                                       15

<PAGE>

      "Subordinated Unit" means a Unit representing a fractional part of the
Partnership Interests of all Limited Partners and Assignees and having the
rights and obligations specified with respect to Subordinated Units in this
Agreement. The term "Subordinated Unit" as used herein does not include a Common
Unit, a Parity Unit, a Senior Subordinated Unit or a Senior Subordinated Series
B Unit. A Subordinated Unit that is convertible into a Common Unit or a Parity
Unit shall not constitute a Common Unit or Parity Unit until such conversion
occurs.

      "Subordination Period" means the period commencing on the Closing Date and
ending on the first to occur of the following dates:

            (a) the first day of any Quarter beginning after December 31, 2007
in respect of which (i) (A) distributions of Available Cash from Operating
Surplus on each of the Outstanding Common Units and Subordinated Units and any
other Outstanding Units that are senior or equal in right of distribution to the
Subordinated Units (other than the Senior Subordinated Units and the Senior
Subordinated Series B Units) with respect to each of the three consecutive,
non-overlapping four-Quarter periods immediately preceding such date equaled or
exceeded the sum of the Minimum Quarterly Distribution (or portion thereof for
the first fiscal quarter after the Closing Date) on all Outstanding Common Units
and Subordinated Units and any other Outstanding Units that are senior or equal
in right of distribution to the Subordinated Units (other than the Senior
Subordinated Units and the Senior Subordinated Series B Units) during such
periods and (B) the Adjusted Operating Surplus generated during each of the
three consecutive, non-overlapping four-Quarter periods immediately preceding
such date equaled or exceeded the sum of the Minimum Quarterly Distribution on
all of the Common Units and Subordinated Units and any other Units that are
senior or equal in right of distribution to the Subordinated Units that were
Outstanding during such periods on a Fully Diluted Basis, plus the related
distribution on the General Partner Interest, during such periods and (ii) there
are no Cumulative Common Unit Arrearages; and

            (b) the date on which the General Partner is removed as general
partner of the Partnership upon the requisite vote by holders of Outstanding
Units under circumstances where Cause does not exist and Units held by the
General Partner and its Affiliates are not voted in favor of such removal.

      "Subsidiary" means, with respect to any Person, (a) a corporation of which
more than 50% of the voting power of shares entitled (without regard to the
occurrence of any contingency) to vote in the election of directors or other
governing body of such corporation is owned, directly or indirectly, at the date
of determination, by such Person, by one or more Subsidiaries of such Person or
a combination thereof, (b) a partnership (whether general or limited) in which
such Person or a Subsidiary of such Person is, at the date of determination, a
general or limited partner of such partnership, but only if more than 50% of the
partnership interests of such partnership (considering all of the partnership
interests of the partnership as a single class) is owned, directly or
indirectly, at the date of determination, by such Person, by one or more
Subsidiaries of such Person, or a combination thereof, or (c) any other Person
(other than a corporation or a partnership) in which such Person, one or more
Subsidiaries of such Person, or a combination thereof, directly or indirectly,
at the date of determination, has (i) at least a majority ownership interest or
(ii) the power to elect or direct the election of a majority of the directors or
other governing body of such Person.

                                       16

<PAGE>

      "Substituted Limited Partner" means a Person who is admitted as a Limited
Partner to the Partnership pursuant to Section 10.2 in place of and with all the
rights of a Limited Partner and who is shown as a Limited Partner on the books
and records of the Partnership.

      "Surviving Business Entity" has the meaning assigned to such term in
Section 14.2(b).

      "Taxable Period of the Partnership" or "taxable period of the Partnership"
has the meaning assigned thereto in Section 5.5(b)(viii).

      "Trading Day" has the meaning assigned to such term in Section 15.1(a).

      "Transfer" has the meaning assigned to such term in Section 4.4(a).

      "Transfer Agent" means such bank, trust company or other Person (including
the General Partner or one of its Affiliates) as shall be appointed from time to
time by the General Partner to act as registrar and transfer agent for the
Common Units; provided that if no Transfer Agent is specifically designated for
any other Partnership Securities, the General Partner shall act in such
capacity.

      "Transfer Application" means an application and agreement for transfer of
Units in the form set forth on the back of a Certificate or in a form
substantially to the same effect in a separate instrument.

      "Underwriter" means each Person named as an underwriter in Schedule I to
the Underwriting Agreement who purchases Common Units pursuant thereto.

      "Underwriting Agreement" means the Underwriting Agreement dated December
11, 2002 among the Underwriters, the Partnership, and certain other parties,
providing for the purchase of Common Units by such Underwriters.

      "Unit" means a Partnership Security that is designated as a "Unit" and
shall include Common Units, Senior Subordinated Units, Senior Subordinated
Series B Units and Subordinated Units but shall not include (i) a General
Partner Interest or (ii) Incentive Distribution Rights.

      "Unit Split" has the meaning assigned to such term in Section 2.1.

      "Unitholders" means the holders of Units.

      "Unit Majority" means, during the Subordination Period, at least a
majority of the Outstanding Common Units (excluding Common Units owned by the
General Partner and its Affiliates) voting as a class and at least a majority of
the Outstanding Senior Subordinated Units, Senior Subordinated Series B Units
and Subordinated Units voting as a single class, and thereafter, at least a
majority of the Outstanding Common Units.

      "Unpaid MQD" has the meaning assigned to such term in Section
6.1(c)(i)(B).

                                       17

<PAGE>

      "Unrealized Gain" of any item of Partnership property at any time means
the excess, if any, of (a) the fair market value of such property at such time
(prior to any adjustment to be made pursuant to Section 5.5(d) as of the time)
over (b) the Carrying Value of such property as of such time prior to any
adjustment to be made pursuant to Section 5.5(d) as of such time.

      "Unrealized Loss" of any item of Partnership property at any time means
the excess, if any, of (a) the Carrying Value of such property as of such time
(prior to any adjustment to be made pursuant to Section 5.5(d) as of such time)
over (b) the fair market value of such property as of such time.

      "Unrecovered Capital" means at any time, with respect to a Unit, the
Initial Unit Price less the sum of all distributions constituting Capital
Surplus theretofore made in respect of an Initial Common Unit and any
distributions of cash (or the Net Agreed Value of any distributions in kind) in
connection with the dissolution and liquidation of the Partnership theretofore
made in respect of an Initial Common Unit, adjusted as the General Partner
determines to be appropriate to give effect to any distribution, subdivision or
combination of such Units.

      "U.S. GAAP" means United States Generally Accepted Accounting Principles
consistently applied.

      "Withdrawal Opinion of Counsel" has the meaning assigned to such term in
Section 11.1(b).

      "Working Capital Borrowings" means borrowings used solely for working
capital purposes or to pay distributions to Partners made pursuant to a credit
facility or other arrangement to the extent such borrowings are required to be
reduced to a relatively small amount each year (or for the year in which the
Initial Offering is consummated, the 12-month period beginning on the Closing
Date) for an economically meaningful period of time.

Section 1.2 Construction.

      Unless the context requires otherwise: (a) any pronoun used in this
Agreement shall include the corresponding masculine, feminine or neuter forms,
and the singular form of nouns, pronouns and verbs shall include the plural and
vice versa; (b) references to Articles and Sections refer to Articles and
Sections of this Agreement; (c) the term "include" or "includes" means includes,
without limitation, and "including" means including, without limitation; and (d)
references to directors, officers and employees of the General Partner shall
mean the directors, officers and employees, respectively, of Crosstex GP acting
on behalf of the General Partner.

                                   ARTICLE II

                                  ORGANIZATION

Section 2.1 Formation.

      The General Partner and the Organizational Limited Partner have previously
formed the Partnership as a limited partnership pursuant to the provisions of
the Delaware Act. The General Partner and the Limited Partners have previously
entered into that certain Amended and Restated

                                       18

<PAGE>

Agreement of Limited Partnership of the Partnership, dated as of December 17,
2002. On March 29, 2004, the General Partner and the Limited Partners entered
into that certain Second Amended and Restated Agreement of Limited Partnership
of the Partnership (i) to reflect the various numerical changes resulting from
the two-for-one split in Common Units and Subordinated Units (the "Unit Split")
declared by Crosstex GP on February 26, 2004, having a record date of March 16,
2004 and a distribution date of March 29, 2004 (ii) and make other miscellaneous
revisions. The Unit Split was effected in accordance with Section 5.12 of this
Agreement, and all such numerical changes are reflected as if the Unit Split had
occurred at the beginning of the Partnership's existence. On June 24, 2005, the
General Partner and the Limited Partners entered into that certain Third Amended
and Restated Agreement of Limited Partnership of the Partnership (i) to
establish the rights and obligations of the Senior Subordinated Units in
connection with the issuance of such Partnership Securities pursuant to Section
5.7(e) of this Agreement and (ii) to make other miscellaneous revisions. The
purpose of this Fourth Amended and Restated Agreement of Limited Partnership is
(i) to establish the rights and obligations of the Senior Subordinated Series B
Units in connection with the issuance of such Partnership Securities pursuant to
Section 5.7(e) of this Agreement and (ii) to make other miscellaneous revisions.
This amendment and restatement shall become effective on the date of this
Agreement. Except as expressly provided to the contrary in this Agreement, the
rights, duties (including fiduciary duties), liabilities and obligations of the
Partners and the administration, dissolution and termination of the Partnership
shall be governed by the Delaware Act. All Partnership Interests shall
constitute personal property of the owner thereof for all purposes and a Partner
has no interest in specific Partnership property.

Section 2.2 Name.

      The name of the Partnership shall be "Crosstex Energy, L.P." The
Partnership's business may be conducted under any other name or names deemed
necessary or appropriate by the General Partner in its sole discretion,
including the name of the General Partner. The words "Limited Partnership,"
"L.P.," "Ltd." or similar words or letters shall be included in the
Partnership's name where necessary for the purpose of complying with the laws of
any jurisdiction that so requires. The General Partner in its discretion may
change the name of the Partnership at any time and from time to time and shall
notify the Limited Partners of such change in the next regular communication to
the Limited Partners.

Section 2.3 Registered Office; Registered Agent; Principal Office; Other Offices

      Unless and until changed by the General Partner, the registered office of
the Partnership in the State of Delaware shall be located at 1209 Orange Street,
Wilmington, Delaware 19801, and the registered agent for service of process on
the Partnership in the State of Delaware at such registered office shall be The
Corporation Trust Company. The principal office of the Partnership shall be
located at 2501 Cedar Springs, Dallas, Texas 75201 or such other place as the
General Partner may from time to time designate by notice to the Limited
Partners. The Partnership may maintain offices at such other place or places
within or outside the State of Delaware as the General Partner deems necessary
or appropriate. The address of the General Partner shall be 2501 Cedar Springs,
Suite 100, Dallas, Texas 75201 or such other place as the General Partner may
from time to time designate by notice to the Limited Partners.

                                       19

<PAGE>

Section 2.4 Purpose and Business.

      The purpose and nature of the business to be conducted by the Partnership
shall be to (a) serve as a partner of the Operating Partnership and, in
connection therewith, to exercise all the rights and powers conferred upon the
Partnership as a partner of the Operating Partnership pursuant to the Operating
Partnership Agreement or otherwise, (b) engage directly in, or enter into or
form any corporation, partnership, joint venture, limited liability company or
other arrangement to engage indirectly in, any business activity that the
Operating Partnership is permitted to engage in by the Operating Partnership
Agreement or that its subsidiaries are permitted to engage in by their limited
liability company or partnership agreements and, in connection therewith, to
exercise all of the rights and powers conferred upon the Partnership pursuant to
the agreements relating to such business activity, (c) engage directly in, or
enter into or form any corporation, partnership, joint venture, limited
liability company or other arrangement to engage indirectly in, any business
activity that is approved by the General Partner and which lawfully may be
conducted by a limited partnership organized pursuant to the Delaware Act and,
in connection therewith, to exercise all of the rights and powers conferred upon
the Partnership pursuant to the agreements relating to such business activity,
and (d) do anything necessary or appropriate to the foregoing, including the
making of capital contributions or loans to a Group Member; provided, however,
that the General Partner shall not cause the Partnership to engage, directly or
indirectly, in any business activity that the General Partner reasonably
determines would cause the Partnership to be treated as an association taxable
as a corporation or otherwise taxable as an entity for federal income tax
purposes. The General Partner has no obligation or duty to the Partnership, the
Limited Partners or the Assignees to propose or approve, and in its discretion
may decline to propose or approve, the conduct by the Partnership of any
business.

Section 2.5 Powers.

      The Partnership shall be empowered to do any and all acts and things
necessary, appropriate, proper, advisable, incidental to or convenient for the
furtherance and accomplishment of the purposes and business described in Section
2.4 and for the protection and benefit of the Partnership.

Section 2.6 Power of Attorney.

      (a) Each Limited Partner and each Assignee hereby constitutes and appoints
the General Partner and, if a Liquidator shall have been selected pursuant to
Section 12.3, the Liquidator (and any successor to the Liquidator by merger,
transfer, assignment, election or otherwise) and each of their authorized
officers and attorneys-in-fact, as the case may be, with full power of
substitution, as his true and lawful agent and attorney-in-fact, with full power
and authority in his name, place and stead, to:

            (i) execute, swear to, acknowledge, deliver, file and record in the
      appropriate public offices (A) all certificates, documents and other
      instruments (including this Agreement and the Certificate of Limited
      Partnership and all amendments or restatements hereof or thereof) that the
      General Partner or the Liquidator deems necessary or appropriate to form,
      qualify or continue the existence or qualification of the Partnership

                                       20

<PAGE>

      as a limited partnership (or a partnership in which the limited partners
      have limited liability) in the State of Delaware and in all other
      jurisdictions in which the Partnership may conduct business or own
      property; (B) all certificates, documents and other instruments that the
      General Partner or the Liquidator deems necessary or appropriate to
      reflect, in accordance with its terms, any amendment, change, modification
      or restatement of this Agreement; (C) all certificates, documents and
      other instruments (including conveyances and a certificate of
      cancellation) that the General Partner or the Liquidator deems necessary
      or appropriate to reflect the dissolution and liquidation of the
      Partnership pursuant to the terms of this Agreement; (D) all certificates,
      documents and other instruments relating to the admission, withdrawal,
      removal or substitution of any Partner pursuant to, or other events
      described in, Article IV, X, XI or XII; (E) all certificates, documents
      and other instruments relating to the determination of the rights,
      preferences and privileges of any class or series of Partnership
      Securities issued pursuant to Section 5.6; and (F) all certificates,
      documents and other instruments (including agreements and a certificate of
      merger) relating to a merger or consolidation of the Partnership pursuant
      to Article XIV; and

            (ii) execute, swear to, acknowledge, deliver, file and record all
      ballots, consents, approvals, waivers, certificates, documents and other
      instruments necessary or appropriate, in the discretion of the General
      Partner or the Liquidator, to make, evidence, give, confirm or ratify any
      vote, consent, approval, agreement or other action that is made or given
      by the Partners hereunder or is consistent with the terms of this
      Agreement or is necessary or appropriate, in the discretion of the General
      Partner or the Liquidator, to effectuate the terms or intent of this
      Agreement; provided, that when required by Section 13.3 or any other
      provision of this Agreement that establishes a percentage of the Limited
      Partners or of the Limited Partners of any class or series required to
      take any action, the General Partner and the Liquidator may exercise the
      power of attorney made in this Section 2.6(a)(ii) only after the necessary
      vote, consent or approval of the Limited Partners or of the Limited
      Partners of such class or series, as applicable.

Nothing contained in this Section 2.6(a) shall be construed as authorizing the
General Partner to amend this Agreement except in accordance with Article XIII
or as may be otherwise expressly provided for in this Agreement.

      (b) The foregoing power of attorney is hereby declared to be irrevocable
and a power coupled with an interest, and it shall survive and, to the maximum
extent permitted by law, not be affected by the subsequent death, incompetency,
disability, incapacity, dissolution, bankruptcy or termination of any Limited
Partner or Assignee and the transfer of all or any portion of such Limited
Partner's or Assignee's Partnership Interest and shall extend to such Limited
Partner's or Assignee's heirs, successors, assigns and personal representatives.
Each such Limited Partner or Assignee hereby agrees to be bound by any
representation made by the General Partner or the Liquidator acting in good
faith pursuant to such power of attorney; and each such Limited Partner or
Assignee, to the maximum extent permitted by law, hereby waives any and all
defenses that may be available to contest, negate or disaffirm the action of the
General Partner or the Liquidator taken in good faith under such power of
attorney. Each Limited Partner or Assignee shall execute and deliver to the
General Partner or the Liquidator, within 15 days after receipt of the request
therefor, such further designation, powers of attorney and other

                                       21

<PAGE>

instruments as the General Partner or the Liquidator deems necessary to
effectuate this Agreement and the purposes of the Partnership.

Section 2.7 Term.

      The term of the Partnership commenced upon the filing of the Certificate
of Limited Partnership in accordance with the Delaware Act and shall continue in
existence until the dissolution of the Partnership in accordance with the
provisions of Article XII. The existence of the Partnership as a separate legal
entity shall continue until the cancellation of the Certificate of Limited
Partnership as provided in the Delaware Act.

Section 2.8 Title to Partnership Assets.

      Title to Partnership assets, whether real, personal or mixed and whether
tangible or intangible, shall be deemed to be owned by the Partnership as an
entity, and no Partner or Assignee, individually or collectively, shall have any
ownership interest in such Partnership assets or any portion thereof. Title to
any or all of the Partnership assets may be held in the name of the Partnership,
the General Partner, one or more of its Affiliates or one or more nominees, as
the General Partner may determine. The General Partner hereby declares and
warrants that any Partnership assets for which record title is held in the name
of the General Partner or one or more of its Affiliates or one or more nominees
shall be held by the General Partner or such Affiliate or nominee for the use
and benefit of the Partnership in accordance with the provisions of this
Agreement; provided, however, that the General Partner shall use reasonable
efforts to cause record title to such assets (other than those assets in respect
of which the General Partner determines that the expense and difficulty of
conveyancing makes transfer of record title to the Partnership impracticable) to
be vested in the Partnership as soon as reasonably practicable; provided,
further, that, prior to the withdrawal or removal of the General Partner or as
soon thereafter as practicable, the General Partner shall use reasonable efforts
to effect the transfer of record title to the Partnership and, prior to any such
transfer, will provide for the use of such assets in a manner satisfactory to
the General Partner. All Partnership assets shall be recorded as the property of
the Partnership in its books and records, irrespective of the name in which
record title to such Partnership assets is held.

                                   ARTICLE III

                           RIGHTS OF LIMITED PARTNERS

Section 3.1 Limitation of Liability.

      The Limited Partners and the Assignees shall have no liability under this
Agreement except as expressly provided in this Agreement or the Delaware Act.

Section 3.2 Management of Business.

      No Limited Partner or Assignee, in its capacity as such, shall participate
in the operation, management or control (within the meaning of the Delaware Act)
of the Partnership's business, transact any business in the Partnership's name
or have the power to sign documents for or otherwise bind the Partnership. Any
action taken by any Affiliate of the General Partner or any officer, director,
employee, manager, member, general partner, agent or trustee of the General
Partner or any of its Affiliates, or any

                                       22

<PAGE>

officer, director, employee, manager, member, general partner, agent or trustee
of a Group Member, in its capacity as such, shall not be deemed to be
participation in the control of the business of the Partnership by a limited
partner of the Partnership (within the meaning of Section 17-303(a) of the
Delaware Act) and shall not affect, impair or eliminate the limitations on the
liability of the Limited Partners or Assignees under this Agreement.

Section 3.3 Outside Activities of the Limited Partners.

      Subject to the provisions of Section 7.5 and the Omnibus Agreement, which
shall continue to be applicable to the Persons referred to therein, regardless
of whether such Persons shall also be Limited Partners or Assignees, any Limited
Partner or Assignee shall be entitled to and may have business interests and
engage in business activities in addition to those relating to the Partnership,
including business interests and activities in direct competition with the
Partnership Group. Neither the Partnership nor any of the other Partners or
Assignees shall have any rights by virtue of this Agreement in any business
ventures of any Limited Partner or Assignee.

Section 3.4       Rights of Limited Partners.

      (a) In addition to other rights provided by this Agreement or by
applicable law, and except as limited by Section 3.4(b), each Limited Partner
shall have the right, for a purpose reasonably related to such Limited Partner's
interest as a limited partner in the Partnership, upon reasonable written demand
and at such Limited Partner's own expense:

            (i) to obtain true and full information regarding the status of the
      business and financial condition of the Partnership;

            (ii) promptly after becoming available, to obtain a copy of the
      Partnership's federal, state and local income tax returns for each year;

            (iii) to have furnished to him a current list of the name and last
      known business, residence or mailing address of each Partner;

            (iv) to have furnished to him a copy of this Agreement and the
      Certificate of Limited Partnership and all amendments thereto, together
      with a copy of the executed copies of all powers of attorney pursuant to
      which this Agreement, the Certificate of Limited Partnership and all
      amendments thereto have been executed;

            (v) to obtain true and full information regarding the amount of cash
      and a description and statement of the Net Agreed Value of any other
      Capital Contribution by each Partner and which each Partner has agreed to
      contribute in the future, and the date on which each became a Partner; and

            (vi) to obtain such other information regarding the affairs of the
      Partnership as is just and reasonable.

                                       23

<PAGE>

      (b) The General Partner may keep confidential from the Limited Partners
and Assignees, for such period of time as the General Partner deems reasonable,
(i) any information that the General Partner reasonably believes to be in the
nature of trade secrets or (ii) other information the disclosure of which the
General Partner in good faith believes (A) is not in the best interests of the
Partnership Group, (B) could damage the Partnership Group or (C) that any Group
Member is required by law or by agreement with any third party to keep
confidential (other than agreements with Affiliates of the Partnership the
primary purpose of which is to circumvent the obligations set forth in this
Section 3.4).

                                   ARTICLE IV

        CERTIFICATES; RECORD HOLDERS; TRANSFER OF PARTNERSHIP INTERESTS;
                       REDEMPTION OF PARTNERSHIP INTERESTS

Section 4.1 Certificates.

      Upon the Partnership's issuance of Common Units, Senior Subordinated
Units, Senior Subordinated Series B Units or Subordinated Units to any Person,
the Partnership may issue one or more Certificates in the name of such Person
evidencing the number of such Units being so issued. In addition, (a) upon the
General Partner's request, the Partnership shall issue to it one or more
Certificates in the name of the General Partner evidencing its interests in the
Partnership and (b) upon the request of any Person owning Incentive Distribution
Rights or any other Partnership Securities, the Partnership shall issue to such
Person one or more certificates evidencing such Incentive Distribution Rights or
other Partnership Securities. Certificates shall be executed on behalf of the
Partnership by the Chairman of the Board, President or any Executive Vice
President or Vice President and the Secretary or any Assistant Secretary of the
General Partner. No Common Unit Certificate shall be valid for any purpose until
it has been countersigned by the Transfer Agent; provided, however, that if the
General Partner elects to issue Common Units in global form, the Common Unit
Certificates shall be valid upon receipt of a certificate from the Transfer
Agent certifying that the Common Units have been duly registered in accordance
with the directions of the Partnership and the Underwriters. Subject to the
requirements of Sections 6.7(c), 6.8(c) and 6.9(b), the Partners holding
Certificates evidencing Senior Subordinated Units, Senior Subordinated Series B
Units or Subordinated Units may exchange such Certificates for Certificates
evidencing Common Units on or after the date on which such Senior Subordinated
Units, Senior Subordinated Series B Units or Subordinated Units are converted
into Common Units pursuant to the terms of Sections 5.8, 5.9 and 5.10,
respectively.

Section 4.2 Mutilated, Destroyed, Lost or Stolen Certificates.

(a) If any mutilated Certificate is surrendered to the Transfer Agent, the
appropriate officers of the General Partner on behalf of the Partnership shall
execute, and the Transfer Agent shall countersign and deliver in exchange
therefor, a new Certificate evidencing the same number and type of Partnership
Securities as the Certificate so surrendered.

                                       24

<PAGE>

      (b) The appropriate officers of the General Partner on behalf of the
Partnership shall execute and deliver, and the Transfer Agent shall countersign,
a new Certificate in place of any Certificate previously issued if the Record
Holder of the Certificate:

            (i) makes proof by affidavit, in form and substance satisfactory to
      the General Partner, that a previously issued Certificate has been lost,
      destroyed or stolen;

            (ii) requests the issuance of a new Certificate before the General
      Partner has notice that the Certificate has been acquired by a purchaser
      for value in good faith and without notice of an adverse claim;

            (iii) if requested by the General Partner, delivers to the General
      Partner a bond, in form and substance satisfactory to the General Partner,
      with surety or sureties and with fixed or open penalty as the General
      Partner may reasonably direct, in its sole discretion, to indemnify the
      Partnership, the Partners, the General Partner and the Transfer Agent
      against any claim that may be made on account of the alleged loss,
      destruction or theft of the Certificate; and

            (iv) satisfies any other reasonable requirements imposed by the
      General Partner.

      If a Limited Partner or Assignee fails to notify the General Partner
within a reasonable time after he has notice of the loss, destruction or theft
of a Certificate, and a transfer of the Limited Partner Interests represented by
the Certificate is registered before the Partnership, the General Partner or the
Transfer Agent receives such notification, the Limited Partner or Assignee shall
be precluded from making any claim against the Partnership, the General Partner
or the Transfer Agent for such transfer or for a new Certificate.

      (c) As a condition to the issuance of any new Certificate under this
Section 4.2, the General Partner may require the payment of a sum sufficient to
cover any tax or other governmental charge that may be imposed in relation
thereto and any other expenses (including the fees and expenses of the Transfer
Agent) reasonably connected therewith.

Section 4.3 Record Holders.

      The Partnership shall be entitled to recognize the Record Holder as the
Partner or Assignee with respect to any Partnership Interest and, accordingly,
shall not be bound to recognize any equitable or other claim to or interest in
such Partnership Interest on the part of any other Person, regardless of whether
the Partnership shall have actual or other notice thereof, except as otherwise
provided by law or any applicable rule, regulation, guideline or requirement of
any National Securities Exchange on which such Partnership Interests are listed
for trading. Without limiting the foregoing, when a Person (such as a broker,
dealer, bank, trust company or clearing corporation or an agent of any of the
foregoing) is acting as nominee, agent or in some other representative capacity
for another Person in acquiring and/or holding Partnership Interests, as between
the Partnership on the one hand, and such other Persons on the other, such
representative Person (a) shall be the Partner or Assignee (as the case may be)
of record and beneficially, (b) must execute and deliver a Transfer Application
and (c) shall be bound by this

                                       25

<PAGE>

Agreement and shall have the rights and obligations of a Partner or Assignee (as
the case may be) hereunder and as, and to the extent, provided for herein.

Section 4.4 Transfer Generally.

      (a) The term "transfer," when used in this Agreement with respect to a
Partnership Interest, shall be deemed to refer to a transaction by which the
General Partner assigns its General Partner Interest to another Person who
becomes the general partner of the Partnership, by which the holder of a Limited
Partner Interest assigns such Limited Partner Interest to another Person who is
or becomes a Limited Partner or an Assignee, and includes a sale, assignment,
gift, pledge, encumbrance, hypothecation, mortgage, exchange or any other
disposition by law or otherwise.

      (b) No Partnership Interest shall be transferred, in whole or in part,
except in accordance with the terms and conditions set forth in this Article IV.
Any transfer or purported transfer of a Partnership Interest not made in
accordance with this Article IV shall be null and void.

      (c) Nothing contained in this Agreement shall be construed to prevent a
disposition by any partner or other owner of the General Partner of any or all
of the partnership interests or other ownership interests of the General
Partner.

Section 4.5 Registration and Transfer of Limited Partner Interests.

      (a) The General Partner shall keep or cause to be kept on behalf of the
Partnership a register in which, subject to such reasonable regulations as it
may prescribe and subject to the provisions of Section 4.5(b), the Partnership
will provide for the registration and transfer of Limited Partner Interests. The
Transfer Agent is hereby appointed registrar and transfer agent for the purpose
of registering Common Units and transfers of such Common Units as herein
provided. The Partnership shall not recognize transfers of Certificates
evidencing Limited Partner Interests unless such transfers are effected in the
manner described in this Section 4.5. Upon surrender of a Certificate for
registration of transfer of any Limited Partner Interests evidenced by a
Certificate, and subject to the provisions of Section 4.5(b), the appropriate
officers of the General Partner on behalf of the Partnership shall execute and
deliver, and in the case of Common Units, the Transfer Agent shall countersign
and deliver, in the name of the holder or the designated transferee or
transferees, as required pursuant to the holder's instructions, one or more new
Certificates evidencing the same aggregate number and type of Limited Partner
Interests as was evidenced by the Certificate so surrendered.

      (b) Except as otherwise provided in Section 4.9, the General Partner shall
not recognize any transfer of Limited Partner Interests until the Certificates
evidencing such Limited Partner Interests are surrendered for registration of
transfer and such Certificates are accompanied by a Transfer Application duly
executed by the transferee (or the transferee's attorney-in-fact duly authorized
in writing). No charge shall be imposed by the General Partner for such
transfer; provided, that as a condition to the issuance of any new Certificate
under this Section 4.5, the General Partner may require the payment of a sum
sufficient to cover any tax or other governmental charge that may be imposed
with respect thereto.

                                       26

<PAGE>

      (c) Limited Partner Interests may be transferred only in the manner
described in this Section 4.5. The transfer of any Limited Partner Interests and
the admission of any new Limited Partner shall not constitute an amendment to
this Agreement.

      (d) Until admitted as a Substituted Limited Partner pursuant to Section
10.2, the Record Holder of a Limited Partner Interest shall be an Assignee in
respect of such Limited Partner Interest. Limited Partners may include
custodians, nominees or any other individual or entity in its own or any
representative capacity.

      (e) A transferee of a Limited Partner Interest who has completed and
delivered a Transfer Application shall be deemed to have (i) requested admission
as a Substituted Limited Partner, (ii) agreed to comply with and be bound by and
to have executed this Agreement, (iii) represented and warranted that such
transferee has the right, power and authority and, if an individual, the
capacity to enter into this Agreement, (iv) granted the powers of attorney set
forth in this Agreement and (v) given the consents and approvals and made the
waivers contained in this Agreement.

      (f) The General Partner and its Affiliates shall have the right at any
time to transfer their Subordinated Units and Common Units (whether issued upon
conversion of the Subordinated Units or otherwise) to one or more Persons.

Section 4.6 Transfer of the General Partner's General Partner Interest.

      (a) Subject to Section 4.6(c) below, prior to December 31, 2012, the
General Partner shall not transfer all or any part of its General Partner
Interest to a Person unless such transfer (i) has been approved by the prior
written consent or vote of the holders of at least a majority of the Outstanding
Common Units (excluding Common Units held by the General Partner and its
Affiliates) or (ii) is of all, but not less than all, of its General Partner
Interest to (A) an Affiliate of the General Partner (other than an individual)
or (B) another Person (other than an individual) in connection with the merger
or consolidation of the General Partner with or into another Person (other than
an individual) or the transfer by the General Partner of all or substantially
all of its assets to another Person (other than an individual).

      (b) Subject to Section 4.6(c) below, on or after December 31, 2012, the
General Partner may transfer all or any of its General Partner Interest without
Unitholder approval.

      (c) Notwithstanding anything herein to the contrary, no transfer by the
General Partner of all or any part of its General Partner Interest to another
Person shall be permitted unless (i) the transferee agrees to assume the rights
and duties of the General Partner under this Agreement and to be bound by the
provisions of this Agreement, (ii) the Partnership receives an Opinion of
Counsel that such transfer would not result in the loss of limited liability of
any Limited Partner or of any limited partner of the Operating Partnership or
cause the Partnership or the Operating Partnership to be treated as an
association taxable as a corporation or otherwise to be taxed as an entity for
federal income tax purposes (to the extent not already so treated or taxed) and
(iii) such transferee also agrees to purchase all (or the appropriate portion
thereof, if applicable) of the partnership or membership interest of the General
Partner as the general partner or managing member, if any, of each other Group
Member. In the case of a transfer

                                       27

<PAGE>

pursuant to and in compliance with this Section 4.6, the transferee or successor
(as the case may be) shall, subject to compliance with the terms of Section
10.3, be admitted to the Partnership as the General Partner immediately prior to
the transfer of the Partnership Interest, and the business of the Partnership
shall continue without dissolution.

Section 4.7 Transfer of Incentive Distribution Rights.

      Prior to December 31, 2012, a holder of Incentive Distribution Rights may
transfer any or all of the Incentive Distribution Rights held by such holder
without any consent of the Unitholders (a) to an Affiliate of such holder (other
than an individual) or (b) to another Person (other than an individual) in
connection with (i) the merger or consolidation of such holder of Incentive
Distribution Rights with or into such other Person, (ii) the transfer by such
holder of all or substantially all of its assets to such other Person or (iii)
the sale of all or substantially all of the equity interests of such holder to
such other Person. Any other transfer of the Incentive Distribution Rights prior
to December 31, 2012, shall require the prior approval of holders of at least a
majority of the Outstanding Common Units (excluding Common Units held by the
General Partner and its Affiliates). On or after December 31, 2012, the General
Partner or any other holder of Incentive Distribution Rights may transfer any or
all of its Incentive Distribution Rights without Unitholder approval.
Notwithstanding anything herein to the contrary, no transfer of Incentive
Distribution Rights to another Person shall be permitted unless the transferee
agrees to be bound by the provisions of this Agreement.

Section 4.8 Restrictions on Transfers.

      (a) Except as provided in Section 4.8(d) below, but notwithstanding the
other provisions of this Article IV, no transfer of any Partnership Interests
shall be made if such transfer would (i) violate the then applicable federal or
state securities laws or rules and regulations of the Commission, any state
securities commission or any other governmental authority with jurisdiction over
such transfer, (ii) terminate the existence or qualification of the Partnership
or the Operating Partnership under the laws of the jurisdiction of its
formation, or (iii) cause the Partnership or the Operating Partnership to be
treated as an association taxable as a corporation or otherwise to be taxed as
an entity for federal income tax purposes (to the extent not already so treated
or taxed).

      (b) The General Partner may impose restrictions on the transfer of
Partnership Interests if a subsequent Opinion of Counsel determines that such
restrictions are necessary to avoid a significant risk of any Group Member
becoming taxable as a corporation or otherwise to be taxed as an entity for
federal income tax purposes. The restrictions may be imposed by making such
amendments to this Agreement as the General Partner may determine to be
necessary or appropriate to impose such restrictions; provided, however, that
any amendment that the General Partner believes, in the exercise of its
reasonable discretion, could result in the delisting or suspension of trading of
any class of Limited Partner Interests on the principal National Securities
Exchange on which such class of Limited Partner Interests is then traded must be
approved, prior to such amendment being effected, by the holders of at least a
majority of the Outstanding Limited Partner Interests of such class.

                                       28

<PAGE>

      (c) The transfer of a Senior Subordinated Unit, a Senior Subordinated
Series B Unit or a Subordinated Unit that has converted into a Common Unit shall
be subject to the restrictions imposed by Sections 6.7(c), 6.8(c) and 6.9(b).

      (d) Nothing contained in this Article IV, or elsewhere in this Agreement,
shall preclude the settlement of any transactions involving Partnership
Interests entered into through the facilities of any National Securities
Exchange on which such Partnership Interests are listed for trading.

Section 4.9 Citizenship Certificates; Non-citizen Assignees.

      (a) If any Group Member is or becomes subject to any federal, state or
local law or regulation that, in the reasonable determination of the General
Partner, creates a substantial risk of cancellation or forfeiture of any
property in which the Group Member has an interest based on the nationality,
citizenship or other related status of a Limited Partner or Assignee, the
General Partner may request any Limited Partner or Assignee to furnish to the
General Partner, within 30 days after receipt of such request, an executed
Citizenship Certification or such other information concerning his nationality,
citizenship or other related status (or, if the Limited Partner or Assignee is a
nominee holding for the account of another Person, the nationality, citizenship
or other related status of such Person) as the General Partner may request. If a
Limited Partner or Assignee fails to furnish to the General Partner within the
aforementioned 30-day period such Citizenship Certification or other requested
information or if upon receipt of such Citizenship Certification or other
requested information the General Partner determines, with the advice of
counsel, that a Limited Partner or Assignee is not an Eligible Citizen, the
Partnership Interests owned by such Limited Partner or Assignee shall be subject
to redemption in accordance with the provisions of Section 4.10. In addition,
the General Partner may require that the status of any such Partner or Assignee
be changed to that of a Non-citizen Assignee and, thereupon, the General Partner
shall be substituted for such Non-citizen Assignee as the Limited Partner in
respect of his Limited Partner Interests.

      (b) The General Partner shall, in exercising voting rights in respect of
Limited Partner Interests held by it on behalf of Non-citizen Assignees,
distribute the votes in the same ratios as the votes of Partners (including
without limitation the General Partner) in respect of Limited Partner Interests
other than those of Non-citizen Assignees are cast, either for, against or
abstaining as to the matter.

      (c) Upon dissolution of the Partnership, a Non-citizen Assignee shall have
no right to receive a distribution in kind pursuant to Section 12.4 but shall be
entitled to the cash equivalent thereof, and the Partnership shall provide cash
in exchange for an assignment of the Non-citizen Assignee's share of the
distribution in kind. Such payment and assignment shall be treated for
Partnership purposes as a purchase by the Partnership from the Non-citizen
Assignee of his Limited Partner Interest (representing his right to receive his
share of such distribution in kind).

      (d) At any time after he can and does certify that he has become an
Eligible Citizen, a Non-citizen Assignee may, upon application to the General
Partner, request admission as a Substituted Limited Partner with respect to any
Limited Partner Interests of such Non-citizen Assignee not redeemed pursuant to
Section 4.10, and upon his admission pursuant to Section

                                       29

<PAGE>

10.2, the General Partner shall cease to be deemed to be the Limited Partner in
respect of the Non-citizen Assignee's Limited Partner Interests.

Section 4.10 Redemption of Partnership Interests of Non-citizen Assignees.

      (a) If at any time a Limited Partner or Assignee fails to furnish a
Citizenship Certification or other information requested within the 30-day
period specified in Section 4.9(a), or if upon receipt of such Citizenship
Certification or other information the General Partner determines, with the
advice of counsel, that a Limited Partner or Assignee is not an Eligible
Citizen, the Partnership may, unless the Limited Partner or Assignee establishes
to the satisfaction of the General Partner that such Limited Partner or Assignee
is an Eligible Citizen or has transferred his Partnership Interests to a Person
who is an Eligible Citizen and who furnishes a Citizenship Certification to the
General Partner prior to the date fixed for redemption as provided below, redeem
the Partnership Interest of such Limited Partner or Assignee as follows:

            (i) The General Partner shall, not later than the 30th day before
      the date fixed for redemption, give notice of redemption to the Limited
      Partner or Assignee, at his last address designated on the records of the
      Partnership or the Transfer Agent, by registered or certified mail,
      postage prepaid. The notice shall be deemed to have been given when so
      mailed. The notice shall specify the Redeemable Interests, the date fixed
      for redemption, the place of payment, that payment of the redemption price
      will be made upon surrender of the Certificate evidencing the Redeemable
      Interests and that on and after the date fixed for redemption no further
      allocations or distributions to which the Limited Partner or Assignee
      would otherwise be entitled in respect of the Redeemable Interests will
      accrue or be made.

            (ii) The aggregate redemption price for Redeemable Interests shall
      be an amount equal to the Current Market Price (the date of determination
      of which shall be the date fixed for redemption) of Limited Partner
      Interests of the class to be so redeemed multiplied by the number of
      Limited Partner Interests of each such class included among the Redeemable
      Interests. The redemption price shall be paid, in the discretion of the
      General Partner, in cash or by delivery of a promissory note of the
      Partnership in the principal amount of the redemption price, bearing
      interest at the rate of 10% annually and payable in three equal annual
      installments of principal together with accrued interest, commencing one
      year after the redemption date.

            (iii) Upon surrender by or on behalf of the Limited Partner or
      Assignee, at the place specified in the notice of redemption, of the
      Certificate evidencing the Redeemable Interests, duly endorsed in blank or
      accompanied by an assignment duly executed in blank, the Limited Partner
      or Assignee or his duly authorized representative shall be entitled to
      receive the payment therefor.

            (iv) After the redemption date, Redeemable Interests shall no longer
      constitute issued and Outstanding Limited Partner Interests.

                                       30

<PAGE>

      (b) The provisions of this Section 4.10 shall also be applicable to
Limited Partner Interests held by a Limited Partner or Assignee as nominee of a
Person determined to be other than an Eligible Citizen.

      (c) Nothing in this Section 4.10 shall prevent the recipient of a notice
of redemption from transferring his Limited Partner Interest before the
redemption date if such transfer is otherwise permitted under this Agreement.
Upon receipt of notice of such a transfer, the General Partner shall withdraw
the notice of redemption, provided the transferee of such Limited Partner
Interest certifies to the satisfaction of the General Partner in a Citizenship
Certification delivered in connection with the Transfer Application that he is
an Eligible Citizen. If the transferee fails to make such certification, such
redemption shall be effected from the transferee on the original redemption
date.

                                    ARTICLE V

           CAPITAL CONTRIBUTIONS AND ISSUANCE OF PARTNERSHIP INTERESTS

Section 5.1 Organizational Contributions.

      In connection with the formation of the Partnership under the Delaware
Act, the General Partner made an initial Capital Contribution to the Partnership
in the amount of $20.00, for a 2% General Partner interest in the Partnership
and has been admitted as the General Partner of the Partnership, and the
Organizational Limited Partner made an initial Capital Contribution to the
Partnership in the amount of $980.00 for a 98% Limited Partner interest in the
Partnership and has been admitted as a Limited Partner of the Partnership. As of
the Closing Date, the interest of the Organizational Limited Partner shall be
redeemed as provided in the Closing Contribution Agreement; the initial Capital
Contributions of the Organizational Limited Partner shall thereupon be refunded;
and the Organizational Limited Partner shall cease to be a Limited Partner of
the Partnership. Ninety-eight percent of any interest or other profit that may
have resulted from the investment or other use of such initial Capital
Contributions shall be allocated and distributed to the Organizational Limited
Partner, and the balance thereof shall be allocated and distributed to the
General Partner. On December 6, 2002 and pursuant to the First Contribution
Agreement, among other things, (i) Crosstex Energy, Inc. and Crosstex Texas Inc.
transferred their interests in the predecessor to the Operating Partnership to
the Partnership in exchange for a limited partner interest in the Partnership
and (ii) Crosstex Texas Inc. transferred its limited partner interest in the
Partnership to the General Partner.

Section 5.2 Contributions by the General Partner and its Affiliates.

      (a) On the Closing Date and pursuant to the Closing Contribution
Agreement, (i) the General Partner's initial general partner interest and its
limited partner interest was converted into (A) the General Partner Interest,
subject to all of the rights, privileges and duties of the General Partner under
this Agreement, and (B) the Incentive Distribution Rights, and (ii) Crosstex
Energy, Inc.'s limited partner interest was converted (taking into account the
effect of the Unit Split) into (A) 666,000 Common Units, (B) 9,334,000
Subordinated Units and (C) the right to receive $2.5 million from the
Partnership on the Closing Date.

                                       31

<PAGE>

      (b) Upon the issuance of any additional Limited Partner Interests by the
Partnership (other than the issuance of the Common Units issued in the Initial
Offering and other than the issuance of the Common Units issued pursuant to the
Over-Allotment Option), the General Partner shall be required to make additional
Capital Contributions equal to 2/98ths of any amount contributed to the
Partnership by the Limited Partners in exchange for the additional Limited
Partner Interests issued to such Limited Partners. Except as set forth in the
immediately preceding sentence and Article XII, the General Partner shall not be
obligated to make any additional Capital Contributions to the Partnership.

Section 5.3 Contributions by Initial Limited Partners.

      (a) On the Closing Date and pursuant to the Underwriting Agreement, each
Underwriter contributed to the Partnership cash in an amount equal to the Issue
Price per Initial Common Unit, multiplied by the number of Common Units
specified in the Underwriting Agreement to be purchased by such Underwriter at
the Closing Date in exchange for such number of Common Units.

      (b) Upon the exercise of the Over-Allotment Option, each Underwriter
contributed to the Partnership cash in an amount equal to the Issue Price per
Initial Common Unit, multiplied by the number of Common Units specified in the
Underwriting Agreement to be purchased by such Underwriter at the Option Closing
Date in exchange for such number of Common Units.

      (c) No Limited Partner Interests were issued or issuable as of or at the
Closing Date other than (i) the Common Units issuable pursuant to subparagraph
(a) hereof in aggregate number equal to 4,000,000, (ii) the "Additional Units"
as such term is used in the Underwriting Agreement in an aggregate number up to
600,000 issuable upon exercise of the Over-Allotment Option pursuant to
subparagraph (b) hereof, (iii) the 666,000 Common Units issuable to Crosstex
Energy, Inc. pursuant to Section 5.2 hereof, (iv) the 9,334,000 Subordinated
Units issuable to Crosstex Energy, Inc. pursuant to Section 5.2 hereof, and (v)
the Incentive Distribution Rights.

Section 5.4 Interest and Withdrawal.

      No interest shall be paid by the Partnership on Capital Contributions. No
Partner or Assignee shall be entitled to the withdrawal or return of its Capital
Contribution, except to the extent, if any, that distributions made pursuant to
this Agreement or upon termination of the Partnership may be considered as such
by law and then only to the extent provided for in this Agreement. Except to the
extent expressly provided in this Agreement, no Partner or Assignee shall have
priority over any other Partner or Assignee either as to the return of Capital
Contributions or as to profits, losses or distributions. Any such return shall
be a compromise to which all Partners and Assignees agree within the meaning of
Section 17-502(b) of the Delaware Act.

Section 5.5 Capital Accounts.

      The provisions of this Section 5.5 are subject to Section 5.5(e) which
addresses the effect of the Unit Split.

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<PAGE>

      (a) The balance of the Capital Account of an Underwriter (and derivatively
of the holder of one or more Common Units who purchases directly or indirectly
from an Underwriter) in respect of each Common Unit acquired thereby pursuant to
the Underwriting Agreement at the Closing or by reason of the exercise of the
Over-Allotment Option shall be the Issue Price for an Initial Common Unit, and
the balance of the Capital Account of each such Underwriter shall be the product
of such initial balance for a Common Unit multiplied by the number of Common
Units held thereby. The initial balance of the Capital Account of the General
Partner and of its Affiliates shall be the amount of cash and the Net Agreed
Value of the property of the Partnership (that is, the property for which the
Partnership computes a Carrying Value) that would be distributed to the General
Partner and any such affiliate pursuant to this Agreement prior to the
contributions that are to be made pursuant to Section 5.3 hereof if such cash
and Net Agreed Value were distributed only to the General Partner Interest and
the Units held by the General Partner and its Affiliates in proportion to the
relative right of such interests to distributions that are made 2% to the
General Partner Interest and 98% to the holders of Units, Pro Rata. The balance
of the Capital Accounts of the Common Units held by such a Person shall be
determined as though the aggregate amount that was deemed distributed with
respect to the Units held thereby was distributed first to such Common Units,
Pro Rata until the Initial Issue Price was distributed to each Common Unit held
thereby. The balance of the Capital Accounts of the Subordinated Units held by
such a Person shall be the portion of such cash and Net Agreed Value that could
have been, but was not, applied pursuant to the preceding sentence in
determining the Capital Account balance of the Common Units. Any Common Unit the
Capital Account balance of which is less than the Initial Issue Price shall be
treated as a converted Subordinated Unit for purposes of Section 5.5(c)(ii) and
Section 6.9(b) and as a Final Subordinated Unit for purposes of Section
6.1(d)(ix). The initial Capital Account balance in respect of each Senior
Subordinated Unit shall be the Issue Price for such Senior Subordinated Unit,
and the initial Capital Account balance of each holder of Senior Subordinated
Units in respect of all Senior Subordinated Units held shall be the product of
such initial balance for a Senior Subordinated Unit multiplied by the number of
Senior Subordinated Units held thereby. The initial Capital Account balance in
respect of each Senior Subordinated Series B Unit shall be the Issue Price for
such Senior Subordinated Series B Unit, and the initial Capital Account balance
of each holder of Senior Subordinated Series B Units in respect of all Senior
Subordinated Series B Units held shall be the product of such initial balance
for a Senior Subordinated Series B Unit multiplied by the number of Senior
Subordinated Series B Units held thereby. The initial Capital Account balance of
any other Partner shall be zero. Thereafter, the Capital Account of each Partner
shall be increased by (i) the amount of cash and the Net Agreed Value of
property contributed to the Partnership by such Partner pursuant to this
Agreement and (ii) all items of Partnership income and gain allocated to such
Partner pursuant to Section 6.1, and it shall be decreased by (x) the amount of
cash or Net Agreed Value of all distributions of cash or property made to such
Partner pursuant to this Agreement and (y) all items of Partnership deduction
and loss allocated to such Partner pursuant to Section 6.1. The General Partner
may in connection with the issuance of Partnership Interests after the Initial
Offering and the exercise (or not) of the Over-Allotment Option adjust the
balance of the Capital Account of any Partner so as to preserve the agreed
economic relationship between the Partnership Interests that are so issued and
the Partnership Interests that were outstanding prior to such issuance; provided
that the economic relationships between the Partnership Interests that were
outstanding prior to such

                                       33

<PAGE>

issuance are not changed thereby. Any such adjustment shall be recorded in the
records of the Partnership.

      (b) The items of income, gain, loss or deduction that are recognized by
the Partnership for federal income tax purposes during a taxable period of the
Partnership shall be adjusted as is set out in this Section 5.5(b) and shall
then be allocated among the Partners as is provided in Section 6.1.

            (i) The Partnership shall be treated as owning directly its share
      (as determined by the General Partner) of all property owned by the
      Operating Partnership or any other Subsidiary that is, in each case,
      classified as a partnership or is disregarded for federal income tax
      purposes.

            (ii) All fees and other expenses incurred by the Partnership to
      promote the sale of (or to sell) a Partnership Interest that cannot either
      be deducted or amortized under Section 709 of the Code shall be treated as
      an item of deduction at the time such fees and other expenses are
      incurred. Any such fees and expenses that were incurred in connection with
      the Initial Offering shall be deemed to have been incurred in the first
      taxable period of the Partnership that ends after the Initial Offering.
      Any underwriting discount or commission that is allowed to an Underwriter
      by reason of the Underwriting Agreement or the Over-Allotment Option, any
      difference between the Initial Unit Price and the Issue Price of the
      Senior Subordinated Units and any difference between the Initial Unit
      Price and the Issue Price of the Senior Subordinated Series B Units, shall
      not be treated as an item of deduction of the Partnership that is
      allocable pursuant to Section 6.1.

            (iii) The computation of items of income, gain, loss and deduction
      shall be made without regard to any election under Section 754 of the
      Code; provided that if an adjustment to the adjusted tax basis of any
      Partnership asset is required pursuant to Section 734(b) or 743(b) of the
      Code, pursuant to Treasury Regulation Section 1.704-1(b)(2)(iv)(m), to be
      taken into account in determining Capital Accounts, the amount of such
      adjustment shall be treated as an item of income or deduction, as the case
      may be, at the time of the adjustment, and the Carrying Value of each
      Partnership asset in respect of which there was such an adjustment shall
      also be adjusted at that time.

            (iv) Any income, gain, deduction or loss attributable to the taxable
      disposition of any Partnership property shall be determined as if the
      adjusted basis of such property were equal to the Partnership's Carrying
      Value for such property as of the date of disposition.

            (v) Any deductions for depreciation, cost recovery or amortization
      that are attributable to any Partnership property shall be determined as
      if the adjusted basis of such property were equal to the Carrying Value
      thereof and by using a rate of depreciation, cost recovery or amortization
      derived from the same method and useful life (or, if applicable, the
      remaining useful life) as is applied for federal income tax purposes and
      appropriately taking into account the length of any short taxable period
      of the Partnership; provided, however, that, if the Partnership property
      has a zero adjusted basis for federal income tax purposes, depreciation,
      cost recovery or amortization deductions

                                       34

<PAGE>

      shall be determined using any reasonable method that the General Partner
      may adopt. Any deduction for depreciation, cost recovery or amortization
      in respect of Partnership property that is determined pursuant to this
      Section 5.5(b) shall reduce the Carrying Value of that Partnership
      property as of the end of the taxable period of the Partnership in which
      such deduction was recognized. Notwithstanding the foregoing portion of
      this Section 5.5(b)(v), such deductions for depreciation, cost recovery,
      or amortization shall be determined with respect to any portion of such
      Carrying Value with respect to which Treasury Regulation Section
      1.704-3(d) remedial allocations are to be made (including reverse section
      704(c) allocations that are to be made as Treasury Regulation Section
      1.704-3(d) remedial allocations) pursuant to provisions hereof in
      accordance with a method that is permitted by such Treasury Regulation
      Section 1.704-3(d) and that is selected by the General Partner.

            (vi) If the Partnership's adjusted basis in property is reduced for
      federal income tax purposes pursuant to Section 48(q)(1) or 48(q)(3) of
      the Code, the amount of such reduction shall be an additional depreciation
      or cost recovery deduction in the year such property is placed in service
      at the time of such reduction and shall be treated as a reduction in the
      Carrying Value of such property. Any restoration of such basis pursuant to
      Section 48(q)(2) of the Code shall be an item of income at the time of
      such restoration and shall be treated as an increase in the Carrying Value
      of such property at the time of such restoration.

            (vii) Any items of gain and loss that are determined pursuant to
      Section 5.5(d) hereof shall be treated as items of income and deduction,
      respectively, that are recognized in the taxable period of the Partnership
      that ends with the event that causes the determination of such gain or
      loss. An item of income of the Partnership that is described in Section
      705(a)(1)(B) of the Code (with respect to items of income that are exempt
      from tax) shall be treated as an item of income for the purpose of this
      Section 5.5(b), and an item of expense of the Partnership that is
      described in Section 705(a)(2)(B) of the Code (with respect to
      expenditures that are deductible and not chargeable to capital accounts),
      shall be treated as an item of deduction for the purpose of this Section
      5.5(b).

            (viii) A taxable period of the Partnership includes a taxable year
      of the Partnership. The portion of a taxable period of the Partnership
      that ends with the Closing Date or with an event in respect of which there
      is an adjustment to Carrying Values pursuant to Section 5.5(d) hereof
      shall be treated as the end of a taxable period of the Partnership. The
      portion of such taxable year of the Partnership that begins immediately
      thereafter shall be treated as a taxable period for purposes of the
      preceding sentence with the result that each taxable year of the
      Partnership may contain one or more taxable periods of the Partnership.
      The items of income, gain, loss and deduction of the Partnership that are
      recognized for federal, state or local income tax purposes prior to the
      Closing Date shall not be allocated pursuant to this Agreement.

      (c) (i) A transferee of a Partnership Interest shall succeed to a pro rata
portion of the Capital Account of the transferor relating to the Partnership
Interest so transferred.

                                       35

<PAGE>

            (ii) Immediately prior to the transfer of a Senior Subordinated
      Unit, a Senior Subordinated Series B Unit or a Subordinated Unit, or of a
      Senior Subordinated Unit, a Senior Subordinated Series B Unit or a
      Subordinated Unit that has converted into a Common Unit pursuant to
      Sections 5.8, 5.9 or 5.10(other than a transfer to an Affiliate unless the
      General Partner elects to have this Section 5.5(c)(ii) apply with respect
      to such transfer), the Capital Account maintained for such Person with
      respect to its Senior Subordinated Units, Senior Subordinated Series B
      Units, Subordinated Units, converted Senior Subordinated Units, converted
      Senior Subordinated Series B Units or converted Subordinated Units, as the
      case may be, will (A) first, be allocated to such Units that are to be
      transferred so that the balance of the Capital Account thereof shall be
      equal to the then balance of the Capital Account of an Initial Common
      Unit, and (B) second, shall be allocated to any Senior Subordinated Units,
      Senior Subordinated Series B Units, Subordinated Units, converted Senior
      Subordinated Units, converted Senior Subordinated Series B Units or
      converted Subordinated Units that are retained. The amount so allocated to
      each class of Units shall thereafter be the balance of the Capital Account
      thereof.

      (d) (i) On an issuance of additional Partnership Interests for cash
(excluding however any issuance of Units pursuant to the Over-Allotment Option)
or other property or the conversion of a General Partner's Combined Interest to
Common Units pursuant to Section 11.3(b), the General Partner may cause any
Unrealized Gain or Unrealized Loss attributable to Partnership property to be
recognized as if there had been a sale of all such property immediately prior to
such issuance in which event the Carrying Value of each Partnership property
shall be adjusted as of the beginning of the next taxable period to be equal to
such fair market value; provided that the General Partner shall cause Unrealized
Gain or Unrealized Loss to be recognized and Carrying Values to be adjusted if
doing so would cause Corrective Allocations to be made pursuant to Section
6.1(d)(xi). In determining such Unrealized Gain or Unrealized Loss, the
aggregate cash amount and fair market value of all Partnership assets
immediately prior to the issuance of additional Partnership Interests shall be
determined by the General Partner using such reasonable method of valuation as
it may adopt; provided, however, that the General Partner, in arriving at such
valuation, must take fully into account the fair market value of the Partnership
Interests of all Partners at such time. The General Partner shall allocate such
aggregate value among the assets of the Partnership (in such manner as it
determines in its discretion to be reasonable). Any adjustments that are made
under this paragraph in connection with the issuance of the Senior Subordinated
Units shall be based on the Initial Unit Price of the Senior Subordinated Units.
Any adjustments that are made under this paragraph in connection with the
issuance of the Senior Subordinated Series B Units shall be based on the Initial
Unit Price of the Senior Subordinated Series B Units.

            (ii) Immediately prior to any distribution to a Partner (other than
      a distribution of cash that is not in redemption or retirement of a
      Partnership Interest), the General Partner may cause any Unrealized Gain
      or Unrealized Loss attributable to each Partnership property to be
      recognized as if there had been a sale of such property immediately prior
      to such distribution in which event the Carrying Value of each Partnership
      property shall be as of the beginning of the next taxable period equal to
      the fair market value thereof; provided that the General Partner shall
      cause Unrealized Gain or Unrealized Loss to be recognized and Carrying
      Values to be adjusted if doing so

                                       36

<PAGE>

      would permit Corrective Allocations to be made pursuant to Section
      6.1(d)(xi). In determining such Unrealized Gain or Unrealized Loss the
      aggregate cash amount and fair market value of all Partnership assets
      immediately prior to a distribution shall (A) in the case of a
      distribution that is not made pursuant to Section 12.4 be determined and
      allocated in the same manner as that provided in Section 5.5(d)(i) or (B)
      in the case of a liquidating distribution pursuant to Section 12.4, be
      determined and allocated by the Liquidator using such reasonable method of
      valuation as it may adopt.

            (iii) After any adjustment of Carrying Values pursuant to Section
      5.5(d)(i) or 5.5(d)(ii), the General Partner shall determine the way, if
      any, in which such changes in Carrying Value shall affect the allocations
      for federal, state and local income tax purposes pursuant to Section 6.2
      of the items of income, gain, loss, deduction and credit that are
      recognized by the Partnership for such purposes. Any such determination
      shall be entered in the records of the Partnership.

      (e) The balance of the Capital Account of a Partner (which is the sum of
the balances of the Capital Account of all the Units or other Partnership
Interests that are owned by the Partner) shall be unchanged by reason of the
Unit Split; but the balance of a Capital Account of a Common Unit or of a
Subordinated Unit at the end of the first taxable period that ends after the
Unit Split shall be 50 percent of the amount that would have been the balance
thereof at that time if the Unit Split had not occurred. In particular, the
balance of a Capital Account of a Common Unit and of a Subordinated Unit shall
be determined pursuant to this Section 5.5 and other provisions of this
Agreement as if the Unit Split had been effective immediately before the initial
application of this Section 5.5 and by giving effect at that time to the
reduction in Initial Unit Price that occurs with the amendments to this
Agreement that implement the Unit Split. The foregoing shall be applied so that
the effect of the Unit Split is to double the number of Common Units and the
number of Subordinated Units that are held by a person who is a holder of Common
Units or who is a holder of Subordinated Units prior to the record date for the
Unit Split without any change being effected in the relative rights of any such
Partner or Assignee, such as the right thereof to distributions. The General
Partner may make such other changes to the determination of Capital Account
balances as are necessary in its judgment to achieve the effect of the Unit
Split that is described in the preceding sentence.

Section 5.6 Issuances of Additional Partnership Securities.

      (a) Subject to Section 5.7, the Partnership may issue additional
Partnership Securities and options, rights, warrants and appreciation rights
relating to the Partnership Securities for any Partnership purpose at any time
and from time to time to such Persons for such consideration and on such terms
and conditions as shall be established by the General Partner in its sole
discretion, all without the approval of any Limited Partners.

      (b) Each additional Partnership Security authorized to be issued by the
Partnership pursuant to Section 5.6(a) may be issued in one or more classes, or
one or more series of any such classes, with such designations, preferences,
rights, powers and duties (which may be senior to existing classes and series of
Partnership Securities), as shall be fixed by the General Partner in the
exercise of its sole discretion, including (i) the right to share Partnership
profits and losses or items thereof; (ii) the right to share in Partnership
distributions (the specification of which

                                       37

<PAGE>

may include an amendment of Section 6.1); (iii) the rights upon dissolution and
liquidation of the Partnership; (iv) whether, and the terms and conditions upon
which, the Partnership may redeem the Partnership Security; (v) whether such
Partnership Security is issued with the privilege of conversion or exchange and,
if so, the terms and conditions of such conversion or exchange; (vi) the terms
and conditions upon which each Partnership Security will be issued, evidenced by
certificates and assigned or transferred; (vii) the number of Units to which
such Partnership Securities are equivalent for the purpose of determining
Percentage Interest (and only for such purpose); and (viii) the right, if any,
of each such Partnership Security to vote on Partnership matters, including
matters relating to the relative rights, preferences and privileges of such
Partnership Security.

      (c) The General Partner is hereby authorized and directed to take all
actions that it deems necessary or appropriate in connection with (i) each
issuance of Partnership Securities and options, rights, warrants and
appreciation rights relating to Partnership Securities pursuant to this Section
5.6, (ii) the conversion of the General Partner Interest or any Incentive
Distribution Rights into Units pursuant to the terms of this Agreement, (iii)
the admission of Additional Limited Partners and (iv) all additional issuances
of Partnership Securities. The General Partner is further authorized and
directed to specify the relative rights, powers and duties of the holders of the
Units or other Partnership Securities being so issued. The General Partner shall
do all things necessary to comply with the Delaware Act and is authorized and
directed to do all things it deems to be necessary or advisable in connection
with any future issuance of Partnership Securities or in connection with the
conversion of the General Partner Interest or any Incentive Distribution Rights
into Units pursuant to the terms of this Agreement, including compliance with
any statute, rule, regulation or guideline of any federal, state or other
governmental agency or any National Securities Exchange on which the Units or
other Partnership Securities are listed for trading.

Section 5.7 Limitations on Issuance of Additional Partnership Securities.

      The issuance of Partnership Securities pursuant to Section 5.6 shall be
subject to the following restrictions and limitations:

      (a) During the Subordination Period, the Partnership shall not issue (and
shall not issue any options, rights, warrants or appreciation rights relating
to) an aggregate of more than 2,333,000 (plus an amount, if any, equal to one
half of the number of Units issued pursuant to the Over-Allotment Option, if and
to the extent exercised) additional Parity Units without the prior approval of
the holders of a Unit Majority; provided that any Common Units that were issued
prior to the Unit Split shall be counted as two Common Units for purposes of
this Section 5.7. In applying this limitation, there shall be excluded Common
Units and other Parity Units issued (A) in connection with the exercise of the
Over-Allotment Option, (B) in accordance with Sections 5.7(b), 5.7(c) and
5.7(d), (C) upon conversion of Subordinated Units pursuant to Section 5.10, (D)
upon conversion of the General Partner Interest or any Incentive Distribution
Rights pursuant to Section 11.3(b), (D) pursuant to the employee benefit plans
of the General Partner, the Partnership or any other Group Member, (E) upon a
conversion or exchange of Parity Units issued after the date hereof into Common
Units or other Parity Units; provided that the total amount of Available Cash
required to pay the aggregate Minimum Quarterly Distribution on all

                                       38

<PAGE>

Common Units and all Parity Units does not increase as a result of this
conversion or exchange, and (F) in the event of a combination or subdivision of
Common Units.

      (b) The Partnership may also issue an unlimited number of Parity Units,
prior to the end of the Subordination Period and without the prior approval of
the Unitholders, if such issuance occurs (i) in connection with an Acquisition
or a Capital Improvement or (ii) within 365 days of, and the net proceeds from
such issuance are used to repay debt incurred in connection with, an Acquisition
or a Capital Improvement, in each case where such Acquisition or Capital
Improvement involves assets that, if acquired by the Partnership as of the date
that is one year prior to the first day of the Quarter in which such Acquisition
is to be consummated or such Capital Improvement is to be completed, would have
resulted, on a pro forma basis, in an increase in:

                  (A) the amount of Adjusted Operating Surplus generated by the
            Partnership on a per-Unit basis (for all Outstanding Units) with
            respect to the most recently completed four-Quarter period (on a pro
            forma basis as described below) as compared to

                  (B) the actual amount of Adjusted Operating Surplus generated
            by the Partnership on a per-Unit basis (for all Outstanding Units)
            (excluding Adjusted Operating Surplus attributable to the
            Acquisition or Capital Improvement) with respect to such most
            recently completed four-Quarter period.

The General Partner's good faith determination that such an increase would have
resulted shall be conclusive. If the issuance of Parity Units with respect to an
Acquisition or Capital Improvement occurs within the first four full Quarters
after the Closing Date, then Adjusted Operating Surplus as used in clauses (A)
(subject to the succeeding sentence) and (B) above shall be calculated (i) for
each Quarter, if any, that commenced after the Closing Date for which actual
results of operations are available, based on the actual Adjusted Operating
Surplus of the Partnership generated with respect to such Quarter, and (ii) for
each other Quarter, on a pro forma basis consistent with the procedures, as
applicable, set forth in Appendix D to the Registration Statement. Furthermore,
the amount in clause (A) shall be determined on a pro forma basis assuming that
(1) all of the Parity Units to be issued in connection with or within 365 days
of such Acquisition or Capital Improvement had been issued and outstanding, (2)
all indebtedness for borrowed money to be incurred or assumed in connection with
such Acquisition or Capital Improvement (other than any such indebtedness that
is to be repaid with the proceeds of such issuance of Parity Units) had been
incurred or assumed, in each case as of the commencement of such four-Quarter
period, (3) the personnel expenses that would have been incurred by the
Partnership in the operation of the acquired assets are the personnel expenses
for employees to be retained by the Partnership in the operation of the acquired
assets, and (4) the non-personnel costs and expenses are computed on the same
basis as those incurred by the Partnership in the operation of the Partnership's
business at similarly situated Partnership facilities. For the purposes of this
Section 5.7(b), the term "debt" shall be deemed to include indebtedness used to
extend, refinance, renew, replace or defease debt originally incurred in
connection with an Acquisition or Capital Improvement; provided, that, the
amount of such extended, refinanced, renewed, replaced or defeased indebtedness
does not exceed the principal

                                       39

<PAGE>

sum of, plus accrued interest on, the indebtedness so extended, replaced
renewed, replaced or defeased.

      (c) The Partnership may also issue an unlimited number of Parity Units,
prior to the end of the Subordination Period and without the approval of the
Unitholders, if the proceeds from such issuance are used exclusively to repay
indebtedness of a Group Member where the aggregate amount of distributions that
would have been paid with respect to such newly issued Units, plus the related
distributions on the General Partner Interest in the Partnership in respect of
the four-Quarter period ending prior to the first day of the Quarter in which
the issuance is to be consummated (assuming such additional Units had been
Outstanding throughout such period and that distributions equal to the
distributions that were actually paid on the Outstanding Units during the period
were paid on such additional Units) would not have exceeded the interest costs
actually incurred during such period on the indebtedness that is to be repaid
(or, if such indebtedness was not outstanding throughout the entire period,
would have been incurred had such indebtedness been outstanding for the entire
period). In the event that the Partnership is required to pay a prepayment
penalty in connection with the repayment of such indebtedness, for purposes of
the foregoing test the number of Parity Units issued to repay such indebtedness
shall be deemed increased by the number of Parity Units that would need to be
issued to pay such penalty.

      (d) During the Subordination Period, without the prior approval of the
holders of a Unit Majority, the Partnership shall not issue any additional
Partnership Securities (or options, rights, warrants or appreciation rights
related thereto) (i) that are entitled in any Quarter to receive in respect of
the Subordination Period any distribution of Available Cash from Operating
Surplus before the Common Units and any Parity Units have received (or amounts
have been set aside for payment of) the Minimum Quarterly Distribution and any
Cumulative Common Unit Arrearage for such Quarter or (ii) that are entitled to
allocations in respect of the Subordination Period of Net Termination Gain
before the Common Units and any Parity Units have been allocated Net Termination
Gain pursuant to Section 6.1(c)(i)(B).

      (e) During the Subordination Period, without the prior approval of the
Unitholders, the Partnership may issue additional Partnership Securities (or
options, rights, warrants or appreciation rights related thereto) (i) that are
not entitled in any Quarter during the Subordination Period to receive any
distributions of Available Cash from Operating Surplus until after the Common
Units and any Parity Units have received (or amounts have been set aside for
payment of) the Minimum Quarterly Distribution and any Cumulative Common Unit
Arrearage for such Quarter and (ii) that are not entitled to allocations in
respect of the Subordination Period of Net Termination Gain before the Common
Units and Parity Units have been allocated Net Termination Gain pursuant to
Section 6.1(c)(i)(B), even if (A) the amount of Available Cash from Operating
Surplus to which each such Partnership Security is entitled to receive after the
Minimum Quarterly Distribution and any Cumulative Common Unit Arrearage have
been paid or set aside for payment on the Common Units exceeds the Minimum
Quarterly Distribution or (B) the amount of Net Termination Gain to be allocated
to such Partnership Security after Net Termination Gain has been allocated to
any Common Units and Parity Units pursuant to Section 6.1(c)(i)(B) exceeds the
amount of such Net Termination Gain to be allocated to each Common Unit or
Parity Unit.

                                       40

<PAGE>

      (f) No fractional Units shall be issued by the Partnership.

Section 5.8 Conversion of Senior Subordinated Units.

      All of the outstanding Senior Subordinated Units will convert into Common
Units on a one-for-one basis on the earlier of (a) February 24, 2006 or (b) the
Liquidation Date. A Senior Subordinated Unit that has converted into a Common
Unit shall be subject to the provisions of Section 6.7(c).

Section 5.9 Conversion of Senior Subordinated Series B Units.

      All of the outstanding Senior Subordinated Series B Units will convert
into Common Units on a one-for-one basis on the earlier of (a) November 14, 2005
or (b) the Liquidation Date. A Senior Subordinated Series B Unit that has
converted into a Common Unit shall be subject to the provisions of Section
6.8(c).

Section 5.10 Conversion of Subordinated Units.

      (a) A total of 2,333,000 of the Outstanding Subordinated Units will
convert into Common Units on a one-for-one basis immediately after the
distribution of Available Cash to Partners pursuant to Section 6.3(a) in respect
of any Quarter ending on or after December 31, 2005, in respect of which:

            (i) distributions under Section 6.4 in respect of all Outstanding
      Common Units and Subordinated Units and any other Outstanding Units that
      are senior or equal in right of distribution to the Subordinated Units
      with respect to each of the three consecutive, non-overlapping
      four-Quarter periods immediately preceding such date equaled or exceeded
      the sum of the Minimum Quarterly Distribution on all of the Outstanding
      Common Units and Subordinated Units and any other Outstanding Units that
      are senior or equal in right of distribution to the Subordinated Units
      during such periods;

            (ii) the Adjusted Operating Surplus generated during each of the
      three consecutive, non-overlapping four-Quarter periods immediately
      preceding such date equaled or exceeded the sum of the Minimum Quarterly
      Distribution on all of the Common Units, Subordinated Units and any other
      Units that are senior or equal in right of distribution to the
      Subordinated Units that were Outstanding during such periods on a Fully
      Diluted Basis, plus the related distribution on the General Partner
      Interest in the Partnership, during such periods; and

            (iii) the Cumulative Common Unit Arrearage on all of the Common
      Units is zero.

      (b) An additional 2,333,000 of the Outstanding Subordinated Units will
convert into Common Units on a one-for-one basis immediately after the
distribution of Available Cash to Partners pursuant to Section 6.3(a) in respect
of any Quarter ending on or after December 31, 2006, in respect of which:

                                       41

<PAGE>

            (i) distributions under Section 6.4 in respect of all Outstanding
      Common Units and Subordinated Units and any other Outstanding Units that
      are senior or equal in right of distribution to the Subordinated Units
      with respect to each of the three consecutive, non-overlapping
      four-Quarter periods immediately preceding such date equaled or exceeded
      the sum of the Minimum Quarterly Distribution on all of the Outstanding
      Common Units and Subordinated Units and any other Outstanding Units that
      are senior or equal in right of distribution to the Subordinated Units
      during such periods;

            (ii) the Adjusted Operating Surplus generated during each of the
      three consecutive, non-overlapping four-Quarter periods immediately
      preceding such date equaled or exceeded the sum of the Minimum Quarterly
      Distribution on all of the Common Units, Subordinated Units and any other
      Units that are senior or equal in right of distribution to the
      Subordinated Units that were Outstanding during such periods on a Fully
      Diluted Basis, plus the related distribution on the General Partner
      Interest during such periods; and

            (iii) the Cumulative Common Unit Arrearage on all of the Common
      Units is zero;

provided, however, that the conversion of Subordinated Units pursuant to this
Section 5.10(b) may not occur until at least one year following the conversion
of Subordinated Units pursuant to Section 5.10(a).

      (c) In the event that less than all of the Outstanding Subordinated Units
shall convert into Common Units pursuant to Sections 5.10(a) or (b) at a time
when there shall be more than one holder of Subordinated Units, then, unless all
of the holders of Subordinated Units shall agree to a different allocation, the
Subordinated Units that are to be converted into Common Units shall be allocated
among the holders of Subordinated Units pro rata based on the number of
Subordinated Units held by each such holder.

      (d) Any Subordinated Units that are not converted into Common Units
pursuant to Section 5.10(a) or (b) shall convert into Common Units on a
one-for-one basis immediately after the distribution of Available Cash to
Partners pursuant to Section 6.3(a) in respect of the final Quarter of the
Subordination Period.

      (e) Notwithstanding any other provision of this Agreement, all the then
Outstanding Subordinated Units will automatically convert into Common Units on a
one-for-one basis as set forth in, and pursuant to the terms of, Section 11.4.

      (f) A Subordinated Unit that has converted into a Common Unit shall be
subject to the provisions of Section 6.9(b).

Section 5.11 Limited Preemptive Right.

      Except as provided in this Section 5.11 and in Section 5.2, no Person
shall have any preemptive, preferential or other similar right with respect to
the issuance of any Partnership Security, whether unissued, held in the treasury
or hereafter created. The General Partner shall have the right, which it may
from time to time assign in whole or in part to any of its Affiliates,

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<PAGE>

to purchase Partnership Securities from the Partnership whenever, and on the
same terms that, the Partnership issues Partnership Securities to Persons other
than the General Partner and its Affiliates, to the extent necessary to maintain
the Percentage Interests of the General Partner and its Affiliates equal to that
which existed immediately prior to the issuance of such Partnership Securities.

Section 5.12 Splits and Combinations.

      (a) Subject to Sections 5.12(d), 6.6 and 6.11 (dealing with adjustments of
distribution levels), the Partnership may make a Pro Rata distribution of
Partnership Securities to all Record Holders or may effect a subdivision or
combination of Partnership Securities so long as, after any such event, each
Partner shall have the same Percentage Interest in the Partnership as before
such event, and any amounts calculated on a per Unit basis (including any Common
Unit Arrearage or Cumulative Common Unit Arrearage) or stated as a number of
Units (including the number of Subordinated Units that may convert prior to the
end of the Subordination Period, the number of Senior Subordinated Units that
may convert pursuant to Section 5.8, the number of Senior Subordinated Series B
Units that may convert pursuant to Section 5.9 and the number of additional
Parity Units that may be issued pursuant to Section 5.7 without a Unitholder
vote) are proportionately adjusted retroactive to the beginning of the
Partnership.

      (b) Whenever such a distribution, subdivision or combination of
Partnership Securities is declared, the General Partner shall select a Record
Date as of which the distribution, subdivision or combination shall be effective
and shall send notice thereof at least 20 days prior to such Record Date to each
Record Holder as of a date not less than 10 days prior to the date of such
notice. The General Partner also may cause a firm of independent public
accountants selected by it to calculate the number of Partnership Securities to
be held by each Record Holder after giving effect to such distribution,
subdivision or combination. The General Partner shall be entitled to rely on any
certificate provided by such firm as conclusive evidence of the accuracy of such
calculation.

      (c) Promptly following any such distribution, subdivision or combination,
the Partnership may issue Certificates to the Record Holders of Partnership
Securities as of the applicable Record Date representing the new number of
Partnership Securities held by such Record Holders, or the General Partner may
adopt such other procedures as it may deem appropriate to reflect such changes.
If any such combination results in a smaller total number of Partnership
Securities Outstanding, the Partnership shall require, as a condition to the
delivery to a Record Holder of such new Certificate, the surrender of any
Certificate held by such Record Holder immediately prior to such Record Date.

      (d) The Partnership shall not issue fractional Units upon any
distribution, subdivision or combination of Units. If a distribution,
subdivision or combination of Units would result in the issuance of fractional
Units but for the provisions of Section 5.7(f) and this Section 5.12(d), each
fractional Unit shall be rounded to the nearest whole Unit (and a 0.5 Unit shall
be rounded to the next higher Unit).

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Section 5.13 Fully Paid and Non-Assessable Nature of Limited Partner Interests.

      All Limited Partner Interests issued pursuant to, and in accordance with
the requirements of, this Article V shall be fully paid and non-assessable
Limited Partner Interests in the Partnership, except as such non-assessability
may be affected by Section 17-607 of the Delaware Act.

                                   ARTICLE VI

                          ALLOCATIONS AND DISTRIBUTIONS

Section 6.1 Allocations for Capital Account Purposes.

      For purposes of maintaining the balances of Capital Accounts, the
Partnership's items of income, gain, loss and deduction for a taxable period of
the Partnership (such items are computed in accordance with Section 5.5(b))
shall be allocated among the Partners first to the extent provided in Section
6.1(d) and then the balance of such items shall be aggregated into Net Income,
Net Loss, Net Termination Gain and Net Termination Loss, as the case may be,
which shall then be allocated as follows:

      (a) Net Income. Net Income for a taxable period of the Partnership shall
be allocated as follows:

            (i) First, 100% to the General Partner, until the aggregate Net
      Income allocated pursuant to this sentence for the current taxable period
      of the Partnership and all previous taxable periods of the Partnership is
      equal to the aggregate Net Loss allocated to the General Partner pursuant
      to Section 6.1(b)(ii) for all previous taxable periods of the Partnership.

            (ii) Second, 2% to the General Partner, and 98% to the Unitholders,
      Pro Rata.

The items of income, gain, loss and deduction that are included in Net Income
for a taxable period of the Partnership shall be allocated in the ratio in which
Net Income for such taxable period is allocated.

      (b) Net Loss. Net Loss for a taxable period of the Partnership shall be
allocated as follows:

            (i) First, 2% to the General Partner, and 98% to the Unitholders,
      Pro Rata; provided, that Net Loss shall not be allocated pursuant to this
      sentence to the extent that such allocation would cause any Unitholder to
      have a deficit balance in its Adjusted Capital Account at the end of such
      taxable period of the Partnership (or increase any existing deficit
      balance in its Adjusted Capital Account). The limitation on the allocation
      of Net Loss that is contained in the preceding sentence is a Required
      Allocation for purposes of the allocation of Curative Allocations in
      Section 6.1(d).

            (ii) Second, the balance, if any, 100% to the General Partner.

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<PAGE>

The items of income, gain, loss and deduction that are included in Net Loss for
a taxable period of the Partnership shall be allocated in the ratio in which Net
Loss for such taxable period is allocated.

      (c) Net Termination Gains and Losses. Allocations under this Section
6.1(c) shall be made after Capital Account balances have been adjusted by all
other allocations provided under this Section 6.1 for the current and prior
taxable periods of the Partnership and for distributions that have been made
pursuant to Sections 6.4 and 6.5 but not for distributions made pursuant to
Section 12.4.

            (i) Any Net Termination Gain for a taxable period of the Partnership
      shall be allocated among the Partners in the following manner and the
      Capital Accounts of the Partners shall be increased by the amount so
      allocated in each subclause, before an allocation is made pursuant to the
      next subclause:

                  (A) First, to each Partner having a deficit balance in its
            Capital Account, in proportion to such deficit balances until each
            Partner has been allocated Net Termination Gain equal to any such
            deficit balance.

                  (B) Second, 98% to all Unitholders holding Common Units, Pro
            Rata, and 2% to the General Partner, until the Capital Account in
            respect of each Common Unit then Outstanding is equal to the sum of
            (1) its Unrecovered Capital at the time plus (2) the Minimum
            Quarterly Distribution for the Quarter during which the Liquidation
            Date occurs, reduced by any distribution pursuant to Section
            6.4(a)(i) or (b)(i) with respect to such Common Unit for such
            Quarter (the amount determined pursuant to this clause (2) is
            hereinafter defined as the "Unpaid MQD") plus (3) any then existing
            Cumulative Common Unit Arrearage.

                  (C) Third, if such Net Termination Gain is recognized prior to
            the expiration of the Subordination Period, 98% to all Unitholders
            holding Subordinated Units, Pro Rata, and 2% to the General Partner,
            until the Capital Account in respect of each Subordinated Unit then
            Outstanding equals the sum of (1) its Unrecovered Capital at the
            time plus (2) the Minimum Quarterly Distribution for the Quarter
            during which the Liquidation Date occurs, reduced by any
            distribution pursuant to Section 6.4(a)(iii) with respect to such
            Subordinated Unit for such Quarter.

                  (D) Fourth, 85% to all Unitholders, Pro Rata, 13% to the
            holders of the Incentive Distribution Rights, Pro Rata, and 2% to
            the General Partner, until the Capital Account in respect of each
            Common Unit then Outstanding is equal to the sum of (1) its
            Unrecovered Capital, plus (2) the Unpaid MQD, plus (3) any then
            existing Cumulative Common Unit Arrearage, plus (4) the excess of
            (aa) the First Target Distribution less the Minimum Quarterly
            Distribution for each Quarter of the Partnership's existence over
            (bb) the cumulative per Unit amount of any distributions of
            Available Cash that is deemed to be Operating Surplus made pursuant
            to Sections 6.4(a)(iv) and 6.4(b)(ii) (the sum of (1) plus (2) plus
            (3) plus (4) is hereinafter defined as the "First Liquidation Target
            Amount").

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<PAGE>

                  (E) Fifth, 75% to all Unitholders, Pro Rata, 23% to the
            holders of the Incentive Distribution Rights, Pro Rata, and 2% to
            the General Partner, until the Capital Account in respect of each
            Common Unit then Outstanding is equal to the sum of (1) the First
            Liquidation Target Amount, plus (2) the excess of (aa) the Second
            Target Distribution less the First Target Distribution for each
            Quarter of the Partnership's existence over (bb) the cumulative per
            Unit amount of any distributions of Available Cash that is deemed to
            be Operating Surplus made pursuant to Sections 6.4(a)(v) and
            6.4(b)(iii).

                  (F) Finally, any remaining amount 50% to all Unitholders, Pro
            Rata, 48% to the holders of the Incentive Distribution Rights, Pro
            Rata, and 2% to the General Partner.

            (ii) Any Net Termination Loss for a taxable period of the
      Partnership shall be allocated first as provided in Section 6.1(d)(xi)
      (with respect to Corrective Allocations) and shall be allocated second
      among the Partners in the following manner:

                  (A) First, if such Net Termination Loss is recognized (or is
            deemed to be recognized) prior to the conversion of the last
            Outstanding Subordinated Unit, 98% to the Unitholders holding
            Subordinated Units, Pro Rata, and 2% to the General Partner, until
            the Capital Account in respect of each Subordinated Unit then
            Outstanding has been reduced to zero. The limitation on the
            allocation of Net Termination Loss that is contained in the
            preceding sentence is a Required Allocation for purposes of the
            allocation of Curative Allocations in Section 6.1(d).

                  (B) Second, 98% to all Unitholders holding Common Units, Pro
            Rata, and 2% to the General Partner, until the Capital Account in
            respect of each Common Unit then Outstanding has been reduced to
            zero. The limitation on the allocation of Net Termination Loss that
            is contained in the preceding sentence is a Required Allocation for
            purposes of the allocation of Curative Allocations in Section
            6.1(d).

                  (C) Third, the balance, if any, 100% to the General Partner.

The items of income, gain, loss and deduction that are included in Net
Termination Gain or Net Termination Loss for a taxable period of the Partnership
shall be allocated in the ratio in which Net Termination Gain or Net Termination
Loss for such taxable period is allocated.

      (d) Special Allocations. Prior to making any allocation pursuant to
another portion of this Section 6.1 for a taxable period of the Partnership, the
following allocations shall be made in the order stated:

            (i) Partnership Minimum Gain Chargeback. If there is a net decrease
      in Partnership Minimum Gain during the taxable period of the Partnership,
      each Partner shall be allocated items of Partnership income and gain for
      such taxable period (and, if necessary, subsequent taxable periods of the
      Partnership) in the manner and amounts provided in Treasury Regulation
      Sections 1.704-2(f) or any successor provision. This

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<PAGE>

      Section 6.1(d)(i) is intended to comply with the Partnership Minimum Gain
      chargeback requirement in Treasury Regulation Section 1.704-2(f) and shall
      be interpreted consistently therewith. The allocations in this portion of
      Section 6.1(d) are a Required Allocation for purposes of the allocation of
      Curative Allocations in Section 6.1(d).

            (ii) Partner Nonrecourse Debt Minimum Gain Chargeback. If there is a
      net decrease in Partner Nonrecourse Debt Minimum Gain during any taxable
      period of the Partnership, any Partner with a share of Partner Nonrecourse
      Debt Minimum Gain at the beginning of such taxable period shall be
      allocated items of Partnership income and gain for such taxable period
      (and, if necessary, subsequent taxable periods of the Partnership) in the
      manner and amounts provided in Treasury Regulation Section 1.704-2(i)(4)
      or any successor provision. This Section 6.1(d)(ii) is intended to comply
      with the Partner Nonrecourse Debt Minimum Gain chargeback of items of
      income and gain requirement in Treasury Regulation Section 1.704-2(i)(4)
      and shall be interpreted consistently therewith. The allocations in this
      portion of Section 6.1(d) are a Required Allocation for purposes of the
      allocation of Curative Allocations in Section 6.1(d).

            (iii) Priority Allocations.

                  (A) First, if the amount of cash or the Net Agreed Value of
            any property distributed (except cash or property distributed
            pursuant to Section 12.4) to any Unitholder with respect to its
            Units during any taxable period of the Partnership is greater on a
            per Unit basis than the amount of cash or the Net Agreed Value of
            property distributed to the other Unitholders with respect to their
            Units on a per Unit basis in such taxable period, then (1) there
            shall be allocated items of gross income and gain to each Unitholder
            receiving such greater distribution until the amount so allocated
            for the current taxable period and all previous taxable periods
            pursuant to this clause (1) is equal to (x) the amount by which the
            distribution on a per Unit basis to such Unitholder exceeds the
            distribution on a per Unit basis to the Unitholders receiving the
            smallest distribution multiplied by (y) the number of Units in
            respect of which such greater distribution was made and (2) the
            General Partner shall be allocated income and gain in an aggregate
            amount equal to 2/98ths of the sum of the amounts allocated in
            clause (1) above. For purposes of applying the provisions of this
            Section 6.1(d)(iii)(A), each Unitholder acquiring Senior
            Subordinated Units at original issuance shall be deemed to have
            received a cash distribution in respect of such Senior Subordinated
            Units in an amount equal to the product of (i) the total number of
            Senior Subordinated Units so acquired by such Unitholder, multiplied
            by (ii) the difference between the Initial Unit Price and the Issue
            Price of the Senior Subordinated Units and each Unitholder acquiring
            Senior Subordinated Series B Units at original issuance shall be
            deemed to have received a cash distribution in respect of such
            Senior Subordinated Series B Units in an amount equal to the product
            of (i) the total number of Senior Subordinated Series B Units so
            acquired by such Unitholder, multiplied by (ii) the difference
            between the Initial Unit Price and the Issue Price of the Senior
            Subordinated Series B Units.

                                       47

<PAGE>

                  (B) Second, income and gain for the taxable period shall be
            allocated (1) to the General Partner until the aggregate amount so
            allocated pursuant to this sentence for the current taxable period
            and all previous taxable periods is equal to the amount that has
            been distributed to the General Partner Interest that is in excess
            of 2/98ths of the amount that has been distributed to the holders of
            Units and (2) 100% to the holders of Incentive Distribution Rights,
            Pro Rata, until the aggregate amount so allocated pursuant to this
            sentence for the current taxable period and all previous taxable
            periods is equal to the cumulative amount of all Incentive
            Distributions, in each case, from the Closing Date to a date 45 days
            after the end of the current taxable period. Any partial
            distribution pursuant to this Section 6.1(d)(iii)(B) shall be
            divided between the General Partner and the holders of Incentive
            Distribution Rights in proportion to their rights to the total
            distribution that could then be made.

            (iv) Qualified Income Offset. In the event any Partner unexpectedly
      receives any adjustment, allocation or distribution described in Treasury
      Regulation Sections 1.704-1(b)(2)(ii)(d)(4), (5), or (6), items of income
      and gain shall be allocated to such Partner in an amount and manner
      sufficient to eliminate, to the extent required by the Treasury
      Regulations promulgated under Section 704(b) of the Code, the deficit
      balance, if any, in its Adjusted Capital Account created by such
      adjustment, allocation or distribution as quickly as possible. The
      allocations in this portion of Section 6.1(d) are a Required Allocation
      for purposes of the allocation of Curative Allocations in Section 6.1(d).

            (v) Gross Income Allocations. In the event any Partner has a deficit
      balance in its Capital Account at the end of any taxable period of the
      Partnership in excess of the sum of (A) the amount such Partner is
      required to restore pursuant to the provisions of this Agreement and (B)
      the amount such Partner is deemed obligated to restore pursuant to
      Treasury Regulation Sections 1.704-2(g) and 1.704-2(i)(5), such Partner
      shall be allocated items of income and gain in the amount of such excess;
      provided, that an allocation pursuant to this Section 6.1(d)(v) shall be
      made only if and to the extent that such Partner would have a deficit
      balance in its Capital Account as adjusted after all other allocations
      provided for in this Section 6.1 have been tentatively made as if this
      Section 6.1(d)(v) were not in this Agreement. The allocations in this
      portion of Section 6.1(d) are a Required Allocation for purposes of the
      allocation of Curative Allocations in Section 6.1(d).

            (vi) Nonrecourse Deductions. Nonrecourse Deductions for the taxable
      period shall be allocated to the Partners in accordance with their
      respective Percentage Interests. If the General Partner determines in good
      faith that the Partnership's Nonrecourse Deductions must be allocated in a
      different ratio to satisfy the safe harbor requirements of the Treasury
      Regulations promulgated under Section 704(b) of the Code, the General
      Partner may, upon notice to the other Partners, revise the prescribed
      ratio in order to satisfy such safe harbor requirements. The allocations
      in this portion of Section 6.1(d) are a Required Allocation for purposes
      of the allocation of Curative Allocations in Section 6.1(d).

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<PAGE>

            (vii) Partner Nonrecourse Deductions. Partner Nonrecourse Deductions
      for the taxable period shall be allocated 100% to the Partner that bears
      the Economic Risk of Loss with respect to the Partner Nonrecourse Debt to
      which such Partner Nonrecourse Deductions are attributable in accordance
      with Treasury Regulation Section 1.704-2(i). If more than one Partner
      bears the Economic Risk of Loss with respect to a Partner Nonrecourse
      Debt, such Partner Nonrecourse Deductions attributable thereto shall be
      allocated among such Partners in accordance with the manner in which they
      share such Economic Risk of Loss. The allocations in this portion of
      Section 6.1(d) are a Required Allocation for purposes of the allocation of
      Curative Allocations in Section 6.1(d).

            (viii) Nonrecourse Liabilities. The portion of the Nonrecourse
      Liabilities of the Partnership that are allocable pursuant to Treasury
      Regulation Section 1.752-3(a)(3) shall be allocated among the Partners in
      accordance with their Percentage Interests. The allocations of Nonrecourse
      Liabilities that may be made as provided in Treasury Regulation Section
      1.752-3(a)(2) are to be made as determined by the General Partner in its
      sole discretion.

            (ix) Economic Uniformity.

                  (A) At the election of the General Partner with respect to any
            taxable period of the Partnership ending upon, or after, the
            termination of the Subordination Period, all or a portion of the
            remaining items of income and gain for such taxable period shall be
            allocated 100% to Partners holding Subordinated Units that are
            Outstanding as of the termination of the Subordination Period
            ("Final Subordinated Units") in the proportion of the number of
            Final Subordinated Units held by such Partners, until each such
            Partner has been allocated the amount which increases the Capital
            Account of each Final Subordinated Unit to the Per Unit Capital
            Amount for a Common Unit.

                  (B) With respect to any taxable period of the Partnership
            ending upon, or after, the conversion of all Senior Subordinated
            Units pursuant to Section 5.8, all or a portion of the remaining
            items of income and gain for such taxable period shall be allocated
            100% to Partners holding Senior Subordinated Units that are
            Outstanding as of the time of such conversion in the proportion of
            the number of Senior Subordinated Units held by such Partners, until
            each such Partner has been allocated the amount which increases the
            Capital Account of each such Senior Subordinated Unit to the Per
            Unit Capital Amount for a Common Unit.

                  (C) With respect to any taxable period of the Partnership
            ending upon, or after, the conversion of all Senior Subordinated
            Series B Units pursuant to Section 5.9, all or a portion of the
            remaining items of income and gain for such taxable period shall be
            allocated 100% to Partners holding Senior Subordinated Series B
            Units that are Outstanding as of the time of such conversion in the
            proportion of the number of Senior Subordinated Series B Units held
            by such Partners, until each such Partner has been allocated the
            amount which increases the Capital Account of each such Senior
            Subordinated Series B Unit to the Per Unit Capital Amount for a
            Common Unit.

                                       49

<PAGE>

            (x) Curative Allocation.

                  (A) Allocations are to be made pursuant to this Section
            6.1(d)(x)(A) so that the net amount of items of income, gain, loss
            and deduction allocated to each Partner pursuant to Section 6.1
            (including allocations made pursuant to this Section 6.1(d)(x)) is
            equal to the net amount of such items that would have been allocated
            to each such Partner under this Section 6.1 if the Required
            Allocations had not been included in this Section 6.1; provided that
            Required Allocations relating to (1) Nonrecourse Deductions shall
            not be taken into account for purposes of this sentence except to
            the extent that there has been a decrease in Partnership Minimum
            Gain and (2) Partner Nonrecourse Deductions shall not be taken into
            account for purposes of this sentence except to the extent that
            there has been a decrease in Partner Nonrecourse Debt Minimum Gain
            and shall then in either case be taken into account only to the
            extent the General Partner reasonably determines that such
            allocations are not likely to be offset by subsequent Required
            Allocations.

                  (B) The General Partner shall have reasonable discretion, with
            respect to each taxable period of the Partnership, to (1) apply the
            provisions of Section 6.1(d)(x)(A) in whatever order is most likely
            to minimize the economic distortions that might otherwise result
            from the Required Allocations and (2) divide all allocations
            pursuant to Section 6.1(d)(x)(A) among the Partners in a manner that
            is likely to minimize such economic distortions.

                  (C) For purposes of identifying the Agreed Allocations, the
            provisions of this Section 6.1(d)(x) are a Required Allocation.

            (xi) Corrective Allocations.

                  (A) Upon the occurrence of a Book-Down Event (the "Current
            Book-Down Event") after one or more Book-Up Events has occurred, the
            General Partner shall determine for each Partner the difference (
            the "Net Effect for the Partner") between

                        (1) the amount that would be the balance of the Capital
                  Account of such Partner pursuant to this Agreement after the
                  Current Book-Down Event taking into account the provisions of
                  this Agreement other than this Section 6.1(d)(xi)(A) as to the
                  effect of the Current Book - Down Event and

                        (2) the amount that would be the balance of the Capital
                  Account of the Partner if the increases and decreases in
                  Carrying Values that occurred in earlier Book-Up Events and
                  Book-Down Events had been reduced or eliminated (doing so in
                  inverse order) so that the Current Book-Down Event would not
                  have generated a change in the aggregate Carrying Value of the
                  Partnership's assets.

                                       50

<PAGE>

            Thereafter, the items of income, gain, loss and deduction that the
            Partnership recognizes (whether in the Current Book-Down Event or
            otherwise) shall be allocated first among the Partners so that to
            the greatest extent possible the Net Effect for each Partner is
            eliminated, and the balance of such items shall then be allocated as
            otherwise provided in this Section 6.1.

                  (B) Any Net Termination Loss that is recognized and so
            characterized without regard to this Section 6.1(d)(xi)(B), shall be
            allocated among the Partners so as to reverse first the allocations
            of any Net Termination Gain that was recognized in a prior taxable
            period to the extent thereof and to reverse second the effect of any
            Book-Up Event that has not theretofore been eliminated pursuant to
            Section 6.1(d)(xi)(A). Any balance of the Net Termination Loss shall
            then be allocated as provided in Section 6.1(c)(ii).

                  (C) The purpose of this Section 6.1(d)(xi) is to prevent a
            Partner from being adversely affected by the occurrence of a Book-Up
            Event and its later reversal by a Book-Down Event or by a Net
            Termination Gain and its later reversal by a Net Termination Loss.
            Any application of this Section 6.1(d)(xi) that is made in good
            faith by the General Partner shall be conclusive.

            (xii) Allocation to Reverse Deemed Capital Contributions. Any items
      of loss or deduction resulting from or relating to the grant of options to
      acquire stock, or the issuance of stock, by Crosstex Energy, Inc., or from
      the transfer of any other property by the General Partner, Crosstex GP, or
      Crosstex Energy, Inc., to any employee or other service provider of the
      Partnership, the Operating Partnership, or any of their respective
      Subsidiaries shall be specially allocated to the General Partner if and to
      the extent such grant of options, issuance of stock, or transfer of
      property was treated under applicable tax law as a deemed capital
      contribution by the General Partner which resulted in an increase to the
      General Partner's Capital Account.

The items of income, gain, loss and deduction that are included in an aggregate
that is allocated pursuant to a provision of this Section 6.1(d) for a taxable
period of the Partnership shall be allocated in the ratio that such aggregate
was allocated.

Section 6.2 Allocations for Tax Purposes.

      (a) Except as otherwise provided in this Section 6.2, each item of income,
gain, loss and deduction that is recognized by the Partnership for federal
income tax purposes shall be allocated among the Partners with reference to the
allocations of the corresponding items pursuant to Section 6.1.

      (b) The Partnership shall make the allocations that are required by
Section 704(c) of the Code with respect to the difference between the fair
market value and adjusted basis for federal income tax purposes of any asset
that the Partnership holds on the Closing Date using remedial allocations within
the meaning of Treasury Regulation Section 1.704-3(d) and in respect of the
difference between fair market value and adjusted tax basis of such assets the
Partnership shall use the recovery periods and depreciation methods that are
used in the

                                       51

<PAGE>

calculations that are identified in the records of the Partnership as the basis
of the estimates that are reported in the "Material Tax Consequences-Tax
Consequences of Unit Ownership - Ratio of taxable income to distributions"
section of the prospectus that is part of the Registration Statement except as
may be provided in the Contribution Agreements. The Partnership shall, at any
other time that it acquires property with respect to which it must make
allocations for federal income tax purposes pursuant to Section 704(c) of the
Code, make such allocations using remedial allocations within the meaning of
Treasury Regulation Section 1.704-3(d) or any other method selected by the
General Partner in its sole discretion. The Partnership shall make any "reverse
section 704(c) allocations", within the meaning of Treasury Regulation Section
1.704-3(a)(6), that may be made upon an adjustment in Carrying Values pursuant
to Section 5.5(d) or at any other time that the General Partner determines in
its sole discretion that the Partnership should make "reverse section 704(c)
allocations" as "remedial allocations" as set out in Treasury Regulation Section
1.704-3(d) or under any other method that the General Partner determines in its
sole discretion that the Partnership should use. The General Partner may cause
the Partnership to make agreements as to the manner in which Section 704(c)
allocations shall be made upon the acquisition by the Partnership of property in
exchange for a Partnership Interest or reverse Section 704(c) allocations shall
be made with respect to the assets of the Partnership upon the issuance by the
Partnership of a Partnership Interest.

      (c) For the proper administration of the Partnership and to facilitate the
calculation of the items of income, gain, loss and deduction that are allocated
to the Partners for federal, state or local income tax purposes and to take into
account the effect of the Section 754 election that the Partnership is to make,
the General Partner shall have sole discretion (i) to adopt such conventions as
it deems appropriate in determining the amount of depreciation, amortization and
cost recovery deductions; (ii) to make special allocations for federal income
tax purposes of income (including, without limitation, gross income) or
deductions; and (iii) to amend the provisions of this Agreement as appropriate
(x) to reflect the proposal or promulgation of Treasury Regulations under
Section 704(b) or Section 704(c) of the Code or (y) otherwise to preserve or
achieve uniformity of the Limited Partner Interests (or any class or classes
thereof) or to facilitate the calculation of such adjustments that are required
by the Section 754 election from the information that is known by the
Partnership, such as the date of the purchase of a Limited Partner Interest and
the amount that is paid therefor.

      (d) The General Partner in its discretion may determine to depreciate or
amortize the portion of an adjustment under Section 743(b) of the Code that is
attributable to unrealized appreciation in any Partnership property (to the
extent of the unamortized difference between Carrying Value and adjusted basis
for federal income tax purposes or if more than one adjustment to Carrying Value
has been made to the extent of any unamortized increment between Carrying Value
and the immediately prior Carrying Value) using a predetermined rate derived
from the depreciation or amortization method and useful life applied to the
Partnership's common basis of such property. If the General Partner determines
that such reporting position cannot reasonably be taken, the General Partner may
adopt depreciation and amortization conventions under which all purchasers
acquiring Limited Partner Interests in the same month would receive depreciation
and amortization deductions, based upon the same applicable rate as if they had
purchased a direct interest in the Partnership's property. If the General
Partner chooses not to utilize such aggregate method, the General Partner may
use any other depreciation and amortization conventions that it determines are
appropriate.

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<PAGE>

      (e) Any gain allocated to a Partner upon the sale or other taxable
disposition of any Partnership asset shall, to the extent possible be
characterized as Recapture Income to the same extent as such Partner (or its
predecessor in interest) has been allocated any deductions directly or
indirectly giving rise to the treatment of such gains as Recapture Income.

      (f) All items of income, gain, loss, deduction and credit recognized by
the Partnership for federal income tax purposes and allocated to the Partners in
accordance with the provisions hereof shall be determined without regard to any
election under Section 754 of the Code which may be made by the Partnership;
provided, however, that such allocations, once made, shall be adjusted as
necessary or appropriate to take into account those adjustments permitted or
required by Sections 734 and 743 of the Code.

      (g) Each item of Partnership income, gain, loss and deduction that is
allocated to a Partner Interest that is transferred during a calendar year shall
for federal income tax purposes, be determined on an annual basis and prorated
on a monthly basis and shall be allocated to the Partners as of the opening of
the New York Stock Exchange on the first Business Day of each month; provided,
however, that (i) such items for the period beginning on the Closing Date and
ending on the last day of the month in which the expiration of the
Over-Allotment Option occurs shall be allocated to the Partners as of the
opening of the New York Stock Exchange on the first Business Day of the next
succeeding month; and provided, further, that gain or loss on a sale or other
disposition of any assets of the Partnership or any other extraordinary item of
income or loss realized and recognized other than in the ordinary course of
business, as determined by the General Partner in its sole discretion, shall be
allocated to the Partners as of the opening of the New York Stock Exchange on
the first Business Day of the month in which such gain or loss is recognized for
federal income tax purposes. The General Partner may revise, alter or otherwise
modify such methods of allocation as it determines necessary or appropriate in
its sole discretion, to the extent permitted or required by Section 706 of the
Code and the regulations or rulings promulgated thereunder.

Section 6.3 Requirement and Characterization of Distributions; Distributions to
            Record Holders.

      (a) Within 45 days following the end of each Quarter commencing with the
Quarter ending on March 31, 2003, an amount equal to 100% of Available Cash with
respect to such Quarter shall, subject to Section 17-607 of the Delaware Act, be
distributed in accordance with this Article VI by the Partnership to the
Partners as of the Record Date selected by the General Partner in its reasonable
discretion. All amounts of Available Cash distributed by the Partnership on any
date from any source shall be deemed to be Operating Surplus until the sum of
all amounts of Available Cash theretofore distributed by the Partnership to the
Partners pursuant to Section 6.4 equals the Operating Surplus from the Closing
Date through the close of the immediately preceding Quarter. Any remaining
amounts of Available Cash distributed by the Partnership on such date shall,
except as otherwise provided in Section 6.5, be deemed to be "Capital Surplus."
All distributions required to be made under this Agreement shall be made subject
to Section 17-607 of the Delaware Act.

      (b) Notwithstanding Section 6.3(a), in the event of the dissolution and
liquidation of the Partnership, all receipts received during or after the
Quarter in which the Liquidation Date

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<PAGE>

occurs, other than from borrowings described in (a)(ii) of the definition of
Available Cash, shall be applied and distributed solely in accordance with, and
subject to the terms and conditions of, Section 12.4.

      (c) The General Partner shall have the discretion to treat taxes paid by
the Partnership on behalf of, or amounts withheld with respect to, all or less
than all of the Partners, as a distribution of Available Cash to such Partners.

      (d) Each distribution in respect of a Partnership Interest shall be paid
by the Partnership, directly or through the Transfer Agent or through any other
Person or agent, only to the Record Holder of such Partnership Interest as of
the Record Date set for such distribution. Such payment shall constitute full
payment and satisfaction of the Partnership's liability in respect of such
payment, regardless of any claim of any Person who may have an interest in such
payment by reason of an assignment or otherwise.

Section 6.4 Distributions of Available Cash from Operating Surplus.

      (a) During Subordination Period. Available Cash with respect to any
Quarter within the Subordination Period that is deemed to be Operating Surplus
pursuant to the provisions of Section 6.3 or 6.5 shall, subject to Section
17-607 of the Delaware Act, be distributed as follows, except as otherwise
required by Section 5.6(b) in respect of additional Partnership Securities
issued pursuant thereto:

            (i) First, 98% to the Unitholders holding Common Units, Pro Rata,
      and 2% to the General Partner, until there has been distributed in respect
      of each Common Unit then Outstanding an amount equal to the Minimum
      Quarterly Distribution for such Quarter;

            (ii) Second, 98% to the Unitholders holding Common Units, Pro Rata,
      and 2% to the General Partner, until there has been distributed in respect
      of each Common Unit then Outstanding an amount equal to the Cumulative
      Common Unit Arrearage existing with respect to such Quarter;

            (iii) Third, 98% to the Unitholders holding Subordinated Units, Pro
      Rata, and 2% to the General Partner, until there has been distributed in
      respect of each Subordinated Unit then Outstanding an amount equal to the
      Minimum Quarterly Distribution for such Quarter;

            (iv) Fourth, 85% to the Unitholders holding Common Units and
      Subordinated Units, Pro Rata, 13% to the holders of the Incentive
      Distribution Rights, Pro Rata, and 2% to the General Partner, until there
      has been distributed in respect of each Unit then Outstanding an amount
      equal to the excess of the First Target Distribution over the Minimum
      Quarterly Distribution for such Quarter;

            (v) Fifth, 75% to the Unitholders holding Common Units and
      Subordinated Units, Pro Rata, 23% to the holders of the Incentive
      Distribution Rights, Pro Rata, and 2% to the General Partner, until there
      has been distributed in respect of each Unit then Outstanding an amount
      equal to the excess of the Second Target Distribution over the First
      Target Distribution for such Quarter; and

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<PAGE>

            (vi) Thereafter, 50% to the Unitholders holding Common Units and
      Subordinated Units, Pro Rata, 48% to the holders of the Incentive
      Distribution Rights, Pro Rata, and 2% to the General Partner;

provided, however, if the Minimum Quarterly Distribution, the First Target
Distribution and the Second Target Distribution have been reduced to zero
pursuant to the second sentence of Section 6.6(a), the distribution of Available
Cash that is deemed to be Operating Surplus with respect to any Quarter will be
made solely in accordance with Section 6.4(a)(vi).

      (b) After Subordination Period. Available Cash with respect to any Quarter
after the Subordination Period that is deemed to be Operating Surplus pursuant
to the provisions of Section 6.3 or 6.5 shall, subject to Section 17-607 of the
Delaware Act, be distributed as follows, except as otherwise required by Section
5.6(b) in respect of additional Partnership Securities issued pursuant thereto:

            (i) First, 98% to all Unitholders, Pro Rata, and 2% to the General
      Partner, until there has been distributed in respect of each Unit then
      Outstanding an amount equal to the Minimum Quarterly Distribution for such
      Quarter;

            (ii) Second, 85% to all Unitholders, Pro Rata, 13% to the holders of
      the Incentive Distribution Rights, Pro Rata, and 2% to the General
      Partner, until there has been distributed in respect of each Unit then
      Outstanding an amount equal to the excess of the First Target Distribution
      over the Minimum Quarterly Distribution for such Quarter;

            (iii) Third, 75% to all Unitholders, Pro Rata, 23% to the holders of
      the Incentive Distribution Rights, Pro Rata, and 2% to the General
      Partner, until there has been distributed in respect of each Unit then
      Outstanding an amount equal to the excess of the Second Target
      Distribution over the First Target Distribution for such Quarter; and

            (iv) Thereafter, 50% to all Unitholders, Pro Rata, 48% to the
      holders of the Incentive Distribution Rights, Pro Rata, and 2% to the
      General Partner;

provided, however, if the Minimum Quarterly Distribution, the First Target
Distribution and the Second Target Distribution have been reduced to zero
pursuant to the second sentence of Section 6.6(a), the distribution of Available
Cash that is deemed to be Operating Surplus with respect to any Quarter will be
made solely in accordance with Section 6.4(b)(iv).

Section 6.5 Distributions of Available Cash from Capital Surplus.

      Available Cash that is deemed to be Capital Surplus pursuant to the
provisions of Section 6.3(a) shall, subject to Section 17-607 of the Delaware
Act, be distributed, unless the provisions of Section 6.3 require otherwise, 98%
to all Unitholders, Pro Rata, and 2% to the General Partner, until a
hypothetical holder of an Initial Common Unit acquired on the Closing Date has
received with respect to such Common Unit, during the period since the Closing
Date through such date, distributions of Available Cash that are deemed to be
Capital Surplus in an aggregate amount equal to the Initial Unit Price.
Available Cash that is deemed to be Capital Surplus shall then be distributed
98% to all Unitholders holding Common Units, Pro Rata, and 2% to the

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<PAGE>

General Partner, until there has been distributed in respect of each Common Unit
then Outstanding an amount equal to the Cumulative Common Unit Arrearage.
Thereafter, all Available Cash shall be distributed as if it were Operating
Surplus and shall be distributed in accordance with Section 6.4. For purposes of
applying this Section 6.5, each Senior Subordinated Unit and each Senior
Subordinated Series B Unit then Outstanding shall be treated as if it had
converted into a Common Unit.

Section 6.6 Adjustment of Minimum Quarterly Distribution and Target Distribution
            Levels.

      (a) The Minimum Quarterly Distribution, First Target Distribution, Second
Target Distribution, Common Unit Arrearages and Cumulative Common Unit
Arrearages shall be proportionately adjusted in the event of any distribution,
combination or subdivision (whether effected by a distribution payable in Units
or otherwise) of Units or other Partnership Securities in accordance with
Section 5.12. In the event of a distribution of Available Cash that is deemed to
be from Capital Surplus, the then applicable Minimum Quarterly Distribution,
First Target Distribution and Second Target Distribution, shall be adjusted
proportionately downward to equal the product obtained by multiplying the
otherwise applicable Minimum Quarterly Distribution, First Target Distribution
and Second Target Distribution, as the case may be, by a fraction of which the
numerator is the Unrecovered Capital of the Common Units immediately after
giving effect to such distribution and of which the denominator is the
Unrecovered Capital of the Common Units immediately prior to giving effect to
such distribution.

      (b) The Minimum Quarterly Distribution, First Target Distribution and
Second Target Distribution shall also be subject to adjustment pursuant to
Section 6.11.

Section 6.7 Special Provisions Relating to the Holders of Senior Subordinated
            Units.

      (a) Except as provided in Section 6.5, until the conversion of the Senior
Subordinated Units into Common Units pursuant to Section 5.8, the Unitholders
holding Senior Subordinated Units shall have no right to the distribution of
Available Cash pursuant to this Article VI.

      (b) Except with respect to the right to receive distributions of Available
Cash, the right to vote on or approve matters requiring the vote or approval of
a percentage of the holders of Outstanding Common Units and the right to
participate in allocations of income, gain, loss and deduction and distributions
made with respect to Common Units, the holder of a Senior Subordinated Unit
shall have all of the rights and obligations of a Unitholder holding Common
Units hereunder; provided, however, that immediately upon the conversion of
Senior Subordinated Units into Common Units pursuant to Section 5.8, the
Unitholder holding a Senior Subordinated Unit shall possess all of the rights
and obligations of a Unitholder holding Common Units hereunder, including the
right to receive distributions of Available Cash, the right to vote as a Common
Unitholder and the right to participate in allocations of income, gain, loss and
deduction and distributions made with respect to Common Units; provided,
however, that such converted Senior Subordinated Units shall remain subject to
the provisions of Sections 5.5(c)(ii), 6.1(d)(ix) and 6.7(c).

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<PAGE>

      (c) A Unitholder holding a Senior Subordinated Unit which has converted
into a Common Unit pursuant to Section 5.8 shall not be issued a Common Unit
Certificate pursuant to Section 4.1, and shall not be permitted to transfer its
converted Senior Subordinated Units to a Person which is not an Affiliate of the
holder until such time as the General Partner determines, based on advice of
counsel, that a converted Senior Subordinated Unit should have, as a substantive
matter, like intrinsic economic and federal income tax characteristics, in all
material respects, to the intrinsic economic and federal income tax
characteristics of an Initial Common Unit; provided, however, that the
comparison of such federal income tax characteristics shall be made by comparing
the federal income tax characteristics of an Initial Common Unit and the
converted Senior Subordinated Unit in the hands of a purchaser for cash of such
converted Senior Subordinated Unit for its fair market value. In connection with
the condition imposed by this Section 6.7(c), the General Partner may take
whatever reasonable steps are required to provide economic uniformity to the
converted Senior Subordinated Units in preparation for a transfer of such
converted Subordinated Units, including the application of Sections 5.5(c)(ii)
and 6.1(d)(ix).

Section 6.8 Special Provisions Relating to the Holders of Senior Subordinated
            Series B Units.

      (a) Except as provided in Section 6.5, until the conversion of the Senior
Subordinated Series B Units into Common Units pursuant to Section 5.9, the
Unitholders holding Senior Subordinated Series B Units shall have no right to
the distribution of Available Cash pursuant to this Article VI.

      (b) Except with respect to the right to receive distributions of Available
Cash, the right to vote on or approve matters requiring the vote or approval of
a percentage of the holders of Outstanding Common Units and the right to
participate in allocations of income, gain, loss and deduction and distributions
made with respect to Common Units, the holder of a Senior Subordinated Series B
Unit shall have all of the rights and obligations of a Unitholder holding Common
Units hereunder; provided, however, that immediately upon the conversion of
Senior Subordinated Series B Units into Common Units pursuant to Section 5.9,
the Unitholder holding a Senior Subordinated Series B Unit shall possess all of
the rights and obligations of a Unitholder holding Common Units hereunder,
including the right to receive distributions of Available Cash, the right to
vote as a Common Unitholder and the right to participate in allocations of
income, gain, loss and deduction and distributions made with respect to Common
Units; provided, however, that such converted Senior Subordinated Series B Units
shall remain subject to the provisions of Sections 5.5(c)(ii), 6.1(d)(ix) and
6.8(c).

      (c) A Unitholder holding a Senior Subordinated Series B Unit which has
converted into a Common Unit pursuant to Section 5.9 shall not be issued a
Common Unit Certificate pursuant to Section 4.1, and shall not be permitted to
transfer its converted Senior Subordinated Series B Units to a Person which is
not an Affiliate of the holder until such time as the General Partner
determines, based on advice of counsel, that a converted Senior Subordinated
Series B Unit should have, as a substantive matter, like intrinsic economic and
federal income tax characteristics, in all material respects, to the intrinsic
economic and federal income tax characteristics of an Initial Common Unit;
provided, however, that the comparison of such federal income tax
characteristics shall be made by comparing the federal income tax

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<PAGE>

characteristics of an Initial Common Unit and the converted Senior Subordinated
Series B Unit in the hands of a purchaser for cash of such converted Senior
Subordinated Series B Unit for its fair market value. In connection with the
condition imposed by this Section 6.8(c), the General Partner may take whatever
reasonable steps are required to provide economic uniformity to the converted
Senior Subordinated Series B Units in preparation for a transfer of such
converted Subordinated Series B Units, including the application of Sections
5.5(c)(ii) and 6.1(d)(ix).

Section 6.9  Special Provisions Relating to the Holders of Subordinated Units.

      (a) Except with respect to the right to vote on or approve matters
requiring the vote or approval of a percentage of the holders of Outstanding
Common Units and the right to participate in allocations of income, gain, loss
and deduction and distributions made with respect to Common Units, the holder of
a Subordinated Unit shall have all of the rights and obligations of a Unitholder
holding Common Units hereunder; provided, however, that immediately upon the
conversion of Subordinated Units into Common Units pursuant to Section 5.10, the
Unitholder holding a Subordinated Unit shall possess all of the rights and
obligations of a Unitholder holding Common Units hereunder, including the right
to vote as a Common Unitholder and the right to participate in allocations of
income, gain, loss and deduction and distributions made with respect to Common
Units; provided, however, that such converted Subordinated Units shall remain
subject to the provisions of Sections 5.5(c)(ii), 6.1(d)(ix) and 6.9(b).

      (b) The Unitholder holding a Subordinated Unit which has converted into a
Common Unit pursuant to Section 5.10 shall not be issued a Common Unit
Certificate pursuant to Section 4.1, and shall not be permitted to transfer its
converted Subordinated Units to a Person which is not an Affiliate of the holder
until such time as the General Partner determines, based on advice of counsel,
that a converted Subordinated Unit should have, as a substantive matter, like
intrinsic economic and federal income tax characteristics, in all material
respects, to the intrinsic economic and federal income tax characteristics of an
Initial Common Unit; provided, however, that the comparison of such federal
income tax characteristics shall be made by comparing the federal income tax
characteristics of an Initial Common Unit and the converted Subordinated Unit in
the hands of a purchaser for cash of such converted Subordinated Unit for its
fair market value. In connection with the condition imposed by this Section
6.9(b), the General Partner may take whatever reasonable steps are required to
provide economic uniformity to the converted Subordinated Units in preparation
for a transfer of such converted Subordinated Units, including the application
of Sections 5.5(c)(ii) and 6.1(d)(ix); provided, however, that no such steps may
be taken that would have a material adverse effect on the Unitholders holding
Common Units represented by Common Unit Certificates.

Section 6.10 Special Provisions Relating to the Holders of Incentive
             Distribution Rights.

      Notwithstanding anything to the contrary set forth in this Agreement, the
holders of the Incentive Distribution Rights (a) shall (i) possess the rights
and obligations provided in this Agreement with respect to a Limited Partner
pursuant to Articles III and VII and (ii) have a Capital Account as a Partner
pursuant to Section 5.5 and all other provisions related thereto and (b) shall
not (i) be entitled to vote on any matters requiring the approval or vote of the
holders of

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<PAGE>

Outstanding Units, (ii) be entitled to any distributions other than as provided
in Sections 6.4(a)(iv), (v) and (vi), 6.4(b)(ii), (iii) and (iv), and 12.4 or
(iii) be allocated items of income, gain, loss or deduction other than as
specified in this Article VI.

Section 6.11 Entity-Level Taxation.

      If legislation is enacted or the interpretation of existing language is
modified by the relevant governmental authority which causes a Group Member to
be treated as an association taxable as a corporation or otherwise subjects a
Group Member to entity-level taxation for federal, state or local income tax
purposes, the then applicable Minimum Quarterly Distribution, First Target
Distribution and Second Target Distribution shall be adjusted to equal the
product obtained by multiplying (a) the amount thereof by (b) one minus the sum
of (i) the highest marginal federal corporate (or other entity, as applicable)
income tax rate of the Group Member for the taxable year of the Group Member in
which such Quarter occurs (expressed as a percentage) plus (ii) the effective
overall state and local income tax rate (expressed as a percentage) applicable
to the Group Member for the calendar year next preceding the calendar year in
which such Quarter occurs (after taking into account the benefit of any
deduction allowable for federal income tax purposes with respect to the payment
of state and local income taxes), but only to the extent of the increase in such
rates resulting from such legislation or interpretation. Such effective overall
state and local income tax rate shall be determined for the taxable year next
preceding the first taxable year during which the Group Member is taxable for
federal income tax purposes as an association taxable as a corporation or is
otherwise subject to entity-level taxation by determining such rate as if the
Group Member had been subject to such state and local taxes during such
preceding taxable year.

                                   ARTICLE VII

                      MANAGEMENT AND OPERATION OF BUSINESS

Section 7.1 Management.

      (a) The General Partner shall conduct, direct and manage all activities of
the Partnership. Except as otherwise expressly provided in this Agreement, all
management powers over the business and affairs of the Partnership shall be
exclusively vested in the General Partner, and no Limited Partner or Assignee
shall have any management power over the business and affairs of the
Partnership. In addition to the powers now or hereafter granted a general
partner of a limited partnership under applicable law or which are granted to
the General Partner under any other provision of this Agreement, the General
Partner, subject to Section 7.3, shall have full power and authority to do all
things and on such terms as it, in its sole discretion, may deem necessary or
appropriate to conduct the business of the Partnership, to exercise all powers
set forth in Section 2.5 and to effectuate the purposes set forth in Section
2.4, including the following:

            (i) the making of any expenditures, the lending or borrowing of
      money, the assumption or guarantee of, or other contracting for,
      indebtedness and other liabilities, the issuance of evidences of
      indebtedness, including indebtedness that is convertible into Partnership
      Securities, and the incurring of any other obligations;

                                       59
<PAGE>

            (ii) the making of tax, regulatory and other filings, or rendering
      of periodic or other reports to governmental or other agencies having
      jurisdiction over the business or assets of the Partnership;

            (iii) the acquisition, disposition, mortgage, pledge, encumbrance,
      hypothecation or exchange of any or all of the assets of the Partnership
      or the merger or other combination of the Partnership with or into another
      Person (the matters described in this clause (iii) being subject, however,
      to any prior approval that may be required by Section 7.3);

            (iv) the use of the assets of the Partnership (including cash on
      hand) for any purpose consistent with the terms of this Agreement,
      including the financing of the conduct of the operations of the
      Partnership Group; subject to Section 7.6(a), the lending of funds to
      other Persons (including other Group Members); the repayment or guarantee
      of obligations of the Partnership Group; and the making of capital
      contributions to any member of the Partnership Group;

            (v) the negotiation, execution and performance of any contracts,
      conveyances or other instruments (including instruments that limit the
      liability of the Partnership under contractual arrangements to all or
      particular assets of the Partnership, with the other party to the contract
      to have no recourse against the General Partner or its assets other than
      its interest in the Partnership, even if same results in the terms of the
      transaction being less favorable to the Partnership than would otherwise
      be the case);

            (vi) the distribution of Partnership cash;

            (vii) the selection and dismissal of employees (including employees
      having titles such as "president," "vice president," "secretary" and
      "treasurer") and agents, outside attorneys, accountants, consultants and
      contractors and the determination of their compensation and other terms of
      employment or hiring;

            (viii) the maintenance of such insurance for the benefit of the
      Partnership Group and the Partners as it deems necessary or appropriate;

            (ix) the formation of, or acquisition of an interest in, and the
      contribution of property and the making of loans to, any further limited
      or general partnerships, joint ventures, corporations, limited liability
      companies or other relationships (including the acquisition of interests
      in, and the contributions of property to, any Group Member from time to
      time) subject to the restrictions set forth in Section 2.4;

            (x) the control of any matters affecting the rights and obligations
      of the Partnership, including the bringing and defending of actions at law
      or in equity and otherwise engaging in the conduct of litigation and the
      incurring of legal expense and the settlement of claims and litigation;

            (xi) the indemnification of any Person against liabilities and
      contingencies to the extent permitted by law;

                                       60
<PAGE>

            (xii) the entering into of listing agreements with any National
      Securities Exchange and the delisting of some or all of the Limited
      Partner Interests from, or requesting that trading be suspended on, any
      such exchange (subject to any prior approval that may be required under
      Section 4.8);

            (xiii) unless restricted or prohibited by Section 5.7, the purchase,
      sale or other acquisition or disposition of Partnership Securities, or the
      issuance of additional options, rights, warrants and appreciation rights
      relating to Partnership Securities; and

            (xiv) the undertaking of any action in connection with the
      Partnership's participation in any Group Member as a member or partner.

      (b) Notwithstanding any other provision of this Agreement, the Operating
Partnership Agreement, the Delaware Act or any applicable law, rule or
regulation, each of the Partners and the Assignees and each other Person who may
acquire an interest in Partnership Securities hereby (i) approves, ratifies and
confirms the execution, delivery and performance by the parties thereto of the
Underwriting Agreement, the Omnibus Agreement, the Contribution Agreements, the
Operating Partnership Agreement, any other limited liability company or
partnership agreement of any other Group Member and the other agreements
described in or filed as exhibits to the Registration Statement that are related
to the transactions contemplated by the Registration Statement; (ii) agrees that
the General Partner (on its own or through any officer of the Partnership) is
authorized to execute, deliver and perform the agreements referred to in clause
(i) of this sentence and the other agreements, acts, transactions and matters
described in or contemplated by the Registration Statement on behalf of the
Partnership without any further act, approval or vote of the Partners or the
Assignees or the other Persons who may acquire an interest in Partnership
Securities; and (iii) agrees that the execution, delivery or performance by the
General Partner, any Group Member or any Affiliate of any of them, of this
Agreement or any agreement authorized or permitted under this Agreement
(including the exercise by the General Partner or any Affiliate of the General
Partner of the rights accorded pursuant to Article XV), shall not constitute a
breach by the General Partner of any duty that the General Partner may owe the
Partnership or the Limited Partners or any other Persons under this Agreement
(or any other agreements) or of any duty stated or implied by law or equity.

Section 7.2 Certificate of Limited Partnership.

      The General Partner has caused the Certificate of Limited Partnership to
be filed with the Secretary of State of the State of Delaware as required by the
Delaware Act. The General Partner shall use all reasonable efforts to cause to
be filed such other certificates or documents as may be determined by the
General Partner in its sole discretion to be reasonable and necessary or
appropriate for the formation, continuation, qualification and operation of a
limited partnership (or a partnership in which the limited partners have limited
liability) in the State of Delaware or any other state in which the Partnership
may elect to do business or own property. To the extent that such action is
determined by the General Partner in its sole discretion to be reasonable and
necessary or appropriate, the General Partner shall file amendments to and
restatements of the Certificate of Limited Partnership and do all things to
maintain the Partnership as a limited partnership (or a partnership or other
entity in which the limited partners have limited liability) under the laws of
the State of Delaware or of any other state in which the Partnership may elect

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<PAGE>

to do business or own property. Subject to the terms of Section 3.4(a), the
General Partner shall not be required, before or after filing, to deliver or
mail a copy of the Certificate of Limited Partnership, any qualification
document or any amendment thereto to any Limited Partner.

Section 7.3 Restrictions on the General Partner's Authority.

      (a) The General Partner may not, without written approval of the specific
act by holders of all of the Outstanding Limited Partner Interests or by other
written instrument executed and delivered by holders of all of the Outstanding
Limited Partner Interests subsequent to the date of this Agreement, take any
action in contravention of this Agreement, including, except as otherwise
provided in this Agreement, (i) committing any act that would make it impossible
to carry on the ordinary business of the Partnership; (ii) possessing
Partnership property, or assigning any rights in specific Partnership property,
for other than a Partnership purpose; (iii) admitting a Person as a Partner;
(iv) amending this Agreement in any manner; or (v) transferring its interest as
a general partner of the Partnership.

      (b) Except as provided in Articles XII and XIV, the General Partner may
not sell, exchange or otherwise dispose of all or substantially all of the
Partnership's assets in a single transaction or a series of related transactions
(including by way of merger, consolidation or other combination) or approve on
behalf of the Partnership the sale, exchange or other disposition of all or
substantially all of the assets of the Operating Partnership and its
Subsidiaries taken as a whole without the approval of holders of a Unit
Majority; provided, however, that this provision shall not preclude or limit the
General Partner's ability to mortgage, pledge, hypothecate or grant a security
interest in all or substantially all of the assets of the Partnership or the
Operating Partnership or their Subsidiaries and shall not apply to any forced
sale of any or all of the assets of the Partnership or the Operating Partnership
or their Subsidiaries pursuant to the foreclosure of, or other realization upon,
any such encumbrance. Without the approval of holders of a Unit Majority, the
General Partner shall not, on behalf of the Partnership, (i)(A) consent to any
amendment to the Operating Partnership Agreement, (B) except as expressly
permitted by Section 7.9(d), take any action permitted to be taken by a partner
of the Operating Partnership, or (C) cause the reduction of the interest of the
Partnership in preferred units of the Operating Partnership, or in other equity,
debt or other securities of the Operating Partnership, that are or may hereafter
be held by Crosstex Louisiana Energy, L.P., a Delaware limited partnership, or
its Subsidiaries or fail to prevent such a reduction (including any reduction
which would occur by reason of a sale or other disposition of any such security
of the Operating Partnership or by reason of an issuance or a sale or other
disposition of any security of Crosstex Louisiana Energy, L.P. or any Subsidiary
thereof), provided, however, that this clause (C) shall not preclude or limit
the General Partner's ability to mortgage, pledge, hypothecate or grant a
security interest in all or substantially all of the assets of the Partnership
or the Operating Partnership or their Subsidiaries and shall not apply to any
forced sale of any or all of the assets of the Partnership or the Operating
Partnership or their Subsidiaries pursuant to the foreclosure of, or other
realization upon, any such encumbrance, in the case of clauses (A) through (C),
that would adversely affect the Limited Partners (including any particular class
of Partnership Interests as compared to any other class of Partnership
Interests) in any material respect or (ii) except as permitted under Sections
4.6, 11.1 and 11.2, elect or cause the Partnership to elect a successor general
partner of the Partnership.

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Section 7.4 Reimbursement of the General Partner.

      (a) Except as provided in this Section 7.4 and elsewhere in this
Agreement, the General Partner shall not be compensated for its services as a
general partner or managing member of any Group Member.

      (b) The General Partner shall be reimbursed on a monthly basis, or such
other reasonable basis as the General Partner may determine in its sole
discretion, for (i) all direct and indirect expenses it incurs or payments it
makes on behalf of the Partnership (including salary, bonus, incentive
compensation and other amounts paid to any Person including Affiliates of the
General Partner to perform services for the Partnership or for the General
Partner in the discharge of its duties to the Partnership), and (ii) all other
necessary or appropriate expenses allocable to the Partnership or otherwise
reasonably incurred by the General Partner in connection with operating the
Partnership's business (including expenses allocated to the General Partner by
its Affiliates). The General Partner shall determine the expenses that are
allocable to the Partnership in any reasonable manner determined by the General
Partner in its sole discretion. Reimbursements pursuant to this Section 7.4
shall be in addition to any reimbursement to the General Partner as a result of
indemnification pursuant to Section 7.7.

      (c) Subject to Section 5.7, the General Partner, in its sole discretion
and without the approval of the Limited Partners (who shall have no right to
vote in respect thereof), may propose and adopt on behalf of the Partnership
employee benefit plans, employee programs and employee practices (including
plans, programs and practices involving the issuance of Partnership Securities
or options to purchase or rights, warrants or appreciation rights relating to
Partnership Securities), or cause the Partnership to issue Partnership
Securities in connection with, or pursuant to, any employee benefit plan,
employee program or employee practice maintained or sponsored by the General
Partner or any of its Affiliates, in each case for the benefit of employees of
the General Partner, any Group Member or any Affiliate, or any of them, in
respect of services performed, directly or indirectly, for the benefit of the
Partnership Group. The Partnership agrees to issue and sell to the General
Partner or any of its Affiliates any Partnership Securities that the General
Partner or such Affiliates are obligated to provide to any employees pursuant to
any such employee benefit plans, employee programs or employee practices.
Expenses incurred by the General Partner in connection with any such plans,
programs and practices (including the net cost to the General Partner or such
Affiliates of Partnership Securities purchased by the General Partner or such
Affiliates from the Partnership to fulfill options or awards under such plans,
programs and practices) shall be reimbursed in accordance with Section 7.4(b).
Any and all obligations of the General Partner under any employee benefit plans,
employee programs or employee practices adopted by the General Partner as
permitted by this Section 7.4(c) shall constitute obligations of the General
Partner hereunder and shall be assumed by any successor General Partner approved
pursuant to Section 11.1 or 11.2 or the transferee of or successor to all of the
General Partner's General Partner Interest pursuant to Section 4.6.

Section 7.5 Outside Activities.

      (a) After the Closing Date, the General Partner, for so long as it is the
General Partner of the Partnership (i) agrees that its sole business will be to
act as a general partner or

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managing member, as the case may be, of the Partnership and any other
partnership or limited liability company of which the Partnership or the
Operating Partnership is, directly or indirectly, a partner or member and to
undertake activities that are ancillary or related thereto (including being a
limited partner in the Partnership), (ii) shall not engage in any business or
activity or incur any debts or liabilities except in connection with or
incidental to (A) its performance as general partner or managing member of one
or more Group Members or as described in or contemplated by the Registration
Statement or (B) the acquiring, owning or disposing of debt or equity securities
in any Group Member and (iii) except to the extent permitted in the Omnibus
Agreement, shall not, and shall cause its Affiliates not to, engage in any
Restricted Business.

      (b) Crosstex Energy, Inc. and certain of its Affiliates have entered into
the Omnibus Agreement, which agreement sets forth certain restrictions on the
ability of Crosstex Energy, Inc. and its Affiliates to engage in Restricted
Businesses.

      (c) Except as specifically restricted by Section 7.5(a) and the Omnibus
Agreement, each Indemnitee (other than the General Partner) shall have the right
to engage in businesses of every type and description and other activities for
profit and to engage in and possess an interest in other business ventures of
any and every type or description, whether in businesses engaged in or
anticipated to be engaged in by any Group Member, independently or with others,
including business interests and activities in direct competition with the
business and activities of any Group Member, and none of the same shall
constitute a breach of this Agreement or any duty express or implied by law to
any Group Member or any Partner or Assignee. Neither any Group Member, any
Limited Partner nor any other Person shall have any rights by virtue of this
Agreement, the Operating Partnership Agreement, the limited liability company or
partnership agreements of any other Group Member or the partnership relationship
established hereby in any business ventures of any Indemnitee.

      (d) Subject to the terms of Section 7.5(a), Section 7.5(b), Section 7.5(c)
and the Omnibus Agreement, but otherwise notwithstanding anything to the
contrary in this Agreement, (i) the engaging in competitive activities by any
Indemnitees (other than the General Partner) in accordance with the provisions
of this Section 7.5 is hereby approved by the Partnership and all Partners, (ii)
it shall be deemed not to be a breach of the General Partner's fiduciary duty or
any other obligation of any type whatsoever of the General Partner for the
Indemnitees (other than the General Partner) to engage in such business
interests and activities in preference to or to the exclusion of the Partnership
and (iii) except as set forth in the Omnibus Agreement, the General Partner and
the Indemnitees shall have no obligation to present business opportunities to
the Partnership.

      (e) The General Partner and any of its Affiliates may acquire Units or
other Partnership Securities in addition to those acquired on the Closing Date
and, except as otherwise provided in this Agreement, shall be entitled to
exercise all rights of the General Partner or Limited Partner, as applicable,
relating to such Units or Partnership Securities.

      (f) The term "Affiliates" when used in Section 7.5(a) and Section 7.5(e)
with respect to the General Partner shall not include any Group Member or any
Subsidiary of the Group Member.

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<PAGE>

      (g) Anything in this Agreement to the contrary notwithstanding, to the
extent that provisions of Sections 7.7, 7.8, 7.9, 7.10 or other Sections of this
Agreement purport or are interpreted to have the effect of restricting the
fiduciary duties that might otherwise, as a result of Delaware or other
applicable law, be owed by the General Partner to the Partnership and its
Limited Partners, or to constitute a waiver or consent by the Limited Partners
to any such restriction, such provisions shall be inapplicable and have no
effect in determining whether the General Partner has complied with its
fiduciary duties in connection with determinations made by it under this Section
7.5.

Section   7.6 Loans from the General Partner; Loans or Contributions from the
          Partnership; Contracts with Affiliates; Certain Restrictions on the
          General Partner.

      (a) The General Partner or any of its Affiliates may lend to any Group
Member, and any Group Member may borrow from the General Partner or any of its
Affiliates, funds needed or desired by the Group Member for such periods of time
and in such amounts as the General Partner may determine; provided, however,
that in any such case the lending party may not charge the borrowing party
interest at a rate greater than the rate that would be charged the borrowing
party or impose terms less favorable to the borrowing party than would be
charged or imposed on the borrowing party by unrelated lenders on comparable
loans made on an arm's-length basis (without reference to the lending party's
financial abilities or guarantees). The borrowing party shall reimburse the
lending party for any costs (other than any additional interest costs) incurred
by the lending party in connection with the borrowing of such funds. For
purposes of this Section 7.6(a) and Section 7.6(b), the term "Group Member"
shall include any Affiliate of a Group Member that is controlled by the Group
Member. No Group Member may lend funds to the General Partner or any of its
Affiliates (other than another Group Member).

      (b) The Partnership may lend or contribute to any Group Member, and any
Group Member may borrow from the Partnership, funds on terms and conditions
established in the sole discretion of the General Partner; provided, however,
that the Partnership may not charge the Group Member interest at a rate less
than the rate that would be charged to the Group Member (without reference to
the General Partner's financial abilities or guarantees) by unrelated lenders on
comparable loans. The foregoing authority shall be exercised by the General
Partner in its sole discretion and shall not create any right or benefit in
favor of any Group Member or any other Person.

      (c) The General Partner may itself, or may enter into an agreement with
any of its Affiliates to, render services to a Group Member or to the General
Partner in the discharge of its duties as General Partner of the Partnership.
Any services rendered to a Group Member by the General Partner or any of its
Affiliates shall be on terms that are fair and reasonable to the Partnership;
provided, however, that the requirements of this Section 7.6(c) shall be deemed
satisfied as to (i) any transaction approved by Special Approval, (ii) any
transaction, the terms of which are no less favorable to the Partnership Group
than those generally being provided to or available from unrelated third parties
or (iii) any transaction that, taking into account the totality of the
relationships between the parties involved (including other transactions that
may be particularly favorable or advantageous to the Partnership Group), is
equitable to the Partnership

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<PAGE>

Group. The provisions of Section 7.4 shall apply to the rendering of services
described in this Section 7.6(c).

      (d) The Partnership Group may transfer assets to joint ventures, other
partnerships, corporations, limited liability companies or other business
entities in which it is or thereby becomes a participant upon such terms and
subject to such conditions as are consistent with this Agreement and applicable
law.

      (e) Neither the General Partner nor any of its Affiliates shall sell,
transfer or convey any property to, or purchase any property from, the
Partnership, directly or indirectly, except pursuant to transactions that are
fair and reasonable to the Partnership; provided, however, that the requirements
of this Section 7.6(e) shall be deemed to be satisfied as to (i) the
transactions effected pursuant to Sections 5.2 and 5.3, the Contribution
Agreements and any other transactions described in or contemplated by the
Registration Statement, (ii) any transaction approved by Special Approval, (iii)
any transaction, the terms of which are no less favorable to the Partnership
than those generally being provided to or available from unrelated third
parties, or (iv) any transaction that, taking into account the totality of the
relationships between the parties involved (including other transactions that
may be particularly favorable or advantageous to the Partnership), is equitable
to the Partnership. With respect to any contribution of assets to the
Partnership in exchange for Partnership Securities, the Conflicts Committee, in
determining whether the appropriate number of Partnership Securities are being
issued, may take into account, among other things, the fair market value of the
assets, the liquidated and contingent liabilities assumed, the tax basis in the
assets, the extent to which tax-only allocations to the transferor will protect
the existing partners of the Partnership against a low tax basis, and such other
factors as the Conflicts Committee deems relevant under the circumstances.

      (f) The General Partner and its Affiliates will have no obligation to
permit any Group Member to use any facilities or assets of the General Partner
and its Affiliates, except as may be provided in contracts entered into from
time to time specifically dealing with such use, nor shall there be any
obligation on the part of the General Partner or its Affiliates to enter into
such contracts.

      (g) Without limitation of Sections 7.6(a) through 7.6(f), and
notwithstanding anything to the contrary in this Agreement, the existence of the
conflicts of interest described in the Registration Statement are hereby
approved by all Partners.

Section 7.7 Indemnification.

      (a) To the fullest extent permitted by law but subject to the limitations
expressly provided in this Agreement, all Indemnitees shall be indemnified and
held harmless by the Partnership from and against any and all losses, claims,
damages, liabilities, joint or several, expenses (including legal fees and
expenses), judgments, fines, penalties, interest, settlements or other amounts
arising from any and all claims, demands, actions, suits or proceedings, whether
civil, criminal, administrative or investigative, in which any Indemnitee may be
involved, or is threatened to be involved, as a party or otherwise, by reason of
its status as an Indemnitee; provided, that in each case the Indemnitee acted in
good faith and in a manner that such Indemnitee reasonably believed to be in, or
(in the case of a Person other than the General

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<PAGE>

Partner) not opposed to, the best interests of the Partnership and, with respect
to any criminal proceeding, had no reasonable cause to believe its conduct was
unlawful; provided, further, no indemnification pursuant to this Section 7.7
shall be available to the General Partner or its Affiliates (other than a Group
Member) with respect to its or their obligations incurred pursuant to the
Underwriting Agreement or the Contribution Agreements (other than obligations
incurred by the General Partner on behalf of the Partnership). The termination
of any action, suit or proceeding by judgment, order, settlement, conviction or
upon a plea of nolo contendere, or its equivalent, shall not create a
presumption that the Indemnitee acted in a manner contrary to that specified
above. Any indemnification pursuant to this Section 7.7 shall be made only out
of the assets of the Partnership, it being agreed that the General Partner shall
not be personally liable for such indemnification and shall have no obligation
to contribute or loan any monies or property to the Partnership to enable it to
effectuate such indemnification.

      (b) To the fullest extent permitted by law, expenses (including legal fees
and expenses) incurred by an Indemnitee who is indemnified pursuant to Section
7.7(a) in defending any claim, demand, action, suit or proceeding shall, from
time to time, be advanced by the Partnership prior to the final disposition of
such claim, demand, action, suit or proceeding upon receipt by the Partnership
of any undertaking by or on behalf of the Indemnitee to repay such amount if it
shall be determined that the Indemnitee is not entitled to be indemnified as
authorized in this Section 7.7.

      (c) The indemnification provided by this Section 7.7 shall be in addition
to any other rights to which an Indemnitee may be entitled under any agreement,
pursuant to any vote of the holders of Outstanding Limited Partner Interests, as
a matter of law or otherwise, both as to actions in the Indemnitee's capacity as
an Indemnitee and as to actions in any other capacity (including any capacity
under the Underwriting Agreement), and shall continue as to an Indemnitee who
has ceased to serve in such capacity and shall inure to the benefit of the
heirs, successors, assigns and administrators of the Indemnitee.

      (d) The Partnership may purchase and maintain (or reimburse the General
Partner or its Affiliates for the cost of) insurance, on behalf of the General
Partner, its Affiliates and such other Persons as the General Partner shall
determine, against any liability that may be asserted against or expense that
may be incurred by such Person in connection with the Partnership's activities
or such Person's activities on behalf of the Partnership, regardless of whether
the Partnership would have the power to indemnify such Person against such
liability under the provisions of this Agreement.

      (e) For purposes of this Section 7.7, the Partnership shall be deemed to
have requested an Indemnitee to serve as fiduciary of an employee benefit plan
whenever the performance by it of its duties to the Partnership also imposes
duties on, or otherwise involves services by, it to the plan or participants or
beneficiaries of the plan; excise taxes assessed on an Indemnitee with respect
to an employee benefit plan pursuant to applicable law shall constitute "fines"
within the meaning of Section 7.7(a); and action taken or omitted by it with
respect to any employee benefit plan in the performance of its duties for a
purpose reasonably believed by it to be in the interest of the participants and
beneficiaries of the plan shall be deemed to be for a purpose which is in, or
not opposed to, the best interests of the Partnership.

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<PAGE>

      (f) In no event may an Indemnitee subject the Limited Partners to personal
liability by reason of the indemnification provisions set forth in this
Agreement.

      (g) An Indemnitee shall not be denied indemnification in whole or in part
under this Section 7.7 because the Indemnitee had an interest in the transaction
with respect to which the indemnification applies if the transaction was
otherwise permitted by the terms of this Agreement.

      (h) The provisions of this Section 7.7 are for the benefit of the
Indemnitees, their heirs, successors, assigns and administrators and shall not
be deemed to create any rights for the benefit of any other Persons.

      (i) No amendment, modification or repeal of this Section 7.7 or any
provision hereof shall in any manner terminate, reduce or impair the right of
any past, present or future Indemnitee to be indemnified by the Partnership, nor
the obligations of the Partnership to indemnify any such Indemnitee under and in
accordance with the provisions of this Section 7.7 as in effect immediately
prior to such amendment, modification or repeal with respect to claims arising
from or relating to matters occurring, in whole or in part, prior to such
amendment, modification or repeal, regardless of when such claims may arise or
be asserted.

Section 7.8 Liability of Indemnitees.

      (a) Notwithstanding anything to the contrary set forth in this Agreement,
no Indemnitee shall be liable for monetary damages to the Partnership, the
Limited Partners, the Assignees or any other Persons who have acquired interests
in the Partnership Securities, for losses sustained or liabilities incurred as a
result of any act or omission if such Indemnitee acted in good faith.

      (b) Subject to its obligations and duties as General Partner set forth in
Section 7.1(a), the General Partner may exercise any of the powers granted to it
by this Agreement and perform any of the duties imposed upon it hereunder either
directly or by or through its agents, and the General Partner shall not be
responsible for any misconduct or negligence on the part of any such agent
appointed by the General Partner in good faith.

      (c) To the extent that, at law or in equity, an Indemnitee has duties
(including fiduciary duties) and liabilities relating thereto to the Partnership
or to the Partners, the General Partner and any other Indemnitee acting in
connection with the Partnership's business or affairs shall not be liable to the
Partnership or to any Partner for its good faith reliance on the provisions of
this Agreement. The provisions of this Agreement, to the extent that they
restrict or otherwise modify the duties and liabilities of an Indemnitee
otherwise existing at law or in equity, are agreed by the Partners to replace
such other duties and liabilities of such Indemnitee.

      (d) Any amendment, modification or repeal of this Section 7.8 or any
provision hereof shall be prospective only and shall not in any way affect the
limitations on the liability to the Partnership, the Limited Partners, the
General Partner, and the Partnership's and General Partner's directors, officers
and employees under this Section 7.8 as in effect immediately prior to such
amendment, modification or repeal with respect to claims arising from or
relating to

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matters occurring, in whole or in part, prior to such amendment, modification or
repeal, regardless of when such claims may arise or be asserted.

Section 7.9 Resolution of Conflicts of Interest.

      (a) Unless otherwise expressly provided in this Agreement, the Operating
Partnership Agreement or the limited liability company or partnership agreement
of any other Group Member, whenever a potential conflict of interest exists or
arises between the General Partner or any of its Affiliates, on the one hand,
and the Partnership, the Operating Partnership, any other Group Member, any
Partner or any Assignee, on the other, any resolution or course of action by the
General Partner or its Affiliates in respect of such conflict of interest shall
be permitted and deemed approved by all Partners, and shall not constitute a
breach of this Agreement, of the Operating Partnership Agreement, of any
agreement contemplated herein or therein, or of any duty stated or implied by
law or equity, if the resolution or course of action is, or by operation of this
Agreement is deemed to be, fair and reasonable to the Partnership. The General
Partner shall be authorized but not required in connection with its resolution
of such conflict of interest to seek Special Approval of such resolution. Any
conflict of interest and any resolution of such conflict of interest shall be
conclusively deemed fair and reasonable to the Partnership if such conflict of
interest or resolution is (i) approved by Special Approval (as long as the
material facts known to the General Partner or any of its Affiliates regarding
any proposed transaction were disclosed to the Conflicts Committee at the time
it gave its approval), (ii) on terms no less favorable to the Partnership than
those generally being provided to or available from unrelated third parties or
(iii) fair to the Partnership, taking into account the totality of the
relationships between the parties involved (including other transactions that
may be particularly favorable or advantageous to the Partnership). The General
Partner may also adopt a resolution or course of action that has not received
Special Approval. The General Partner (including the Conflicts Committee in
connection with Special Approval) shall be authorized in connection with its
determination of what is "fair and reasonable" to the Partnership and in
connection with its resolution of any conflict of interest to consider (A) the
relative interests of any party to such conflict, agreement, transaction or
situation and the benefits and burdens relating to such interest; (B) any
customary or accepted industry practices and any customary or historical
dealings with a particular Person; (C) any applicable generally accepted
accounting practices or principles; and (D) such additional factors as the
General Partner (including the Conflicts Committee) determines in its sole
discretion to be relevant, reasonable or appropriate under the circumstances.
Nothing contained in this Agreement, however, is intended to nor shall it be
construed to require the General Partner (including the Conflicts Committee) to
consider the interests of any Person other than the Partnership. In the absence
of bad faith by the General Partner, the resolution, action or terms so made,
taken or provided by the General Partner with respect to such matter shall not
constitute a breach of this Agreement or any other agreement contemplated herein
or a breach of any standard of care or duty imposed herein or therein or, to the
extent permitted by law, under the Delaware Act or any other law, rule or
regulation.

      (b) Whenever this Agreement or any other agreement contemplated hereby
provides that the General Partner or any of its Affiliates is permitted or
required to make a decision (i) in its "sole discretion" or "discretion," that
it deems "necessary or appropriate" or "necessary or advisable" or under a grant
of similar authority or latitude, except as otherwise provided herein, the
General Partner or such Affiliate shall be entitled to consider only such
interests and factors

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<PAGE>

as it desires and shall have no duty or obligation to give any consideration to
any interest of, or factors affecting, the Partnership, any other Group Member,
any Limited Partner or any Assignee, (ii) it may make such decision in its sole
discretion (regardless of whether there is a reference to "sole discretion" or
"discretion") unless another express standard is provided for, or (iii) in "good
faith" or under another express standard, the General Partner or such Affiliate
shall act under such express standard and shall not be subject to any other or
different standards imposed by this Agreement, the Operating Partnership
Agreement, the limited liability company or partnership agreement of any other
Group Member, any other agreement contemplated hereby or under the Delaware Act
or any other law, rule or regulation. In addition, any actions taken by the
General Partner or such Affiliate consistent with the standards of "reasonable
discretion" set forth in the definitions of Available Cash or Operating Surplus
shall not constitute a breach of any duty of the General Partner to the
Partnership or the Limited Partners. The General Partner shall have no duty,
express or implied, to sell or otherwise dispose of any asset of the Partnership
Group other than in the ordinary course of business. No borrowing by any Group
Member or the approval thereof by the General Partner shall be deemed to
constitute a breach of any duty of the General Partner to the Partnership or the
Limited Partners by reason of the fact that the purpose or effect of such
borrowing is directly or indirectly to (A) enable distributions to the General
Partner or its Affiliates (including in their capacities as Limited Partners) to
exceed 2% of the total amount distributed to all partners or (B) hasten the
expiration of the Subordination Period or the conversion of any Subordinated
Units into Common Units.

      (c) Whenever a particular transaction, arrangement or resolution of a
conflict of interest is required under this Agreement to be "fair and
reasonable" to any Person, the fair and reasonable nature of such transaction,
arrangement or resolution shall be considered in the context of all similar or
related transactions.

      (d) The Unitholders hereby authorize the General Partner, on behalf of the
Partnership as a partner or member of a Group Member, to approve of actions by
the general partner or managing member of such Group Member similar to those
actions permitted to be taken by the General Partner pursuant to this Section
7.9.

Section 7.10 Other Matters Concerning the General Partner.

      (a) The General Partner may rely and shall be protected in acting or
refraining from acting upon any resolution, certificate, statement, instrument,
opinion, report, notice, request, consent, order, bond, debenture or other paper
or document believed by it to be genuine and to have been signed or presented by
the proper party or parties.

      (b) The General Partner may consult with legal counsel, accountants,
appraisers, management consultants, investment bankers and other consultants and
advisers selected by it, and any act taken or omitted to be taken in reliance
upon the opinion (including an Opinion of Counsel) of such Persons as to matters
that the General Partner reasonably believes to be within such Person's
professional or expert competence shall be conclusively presumed to have been
done or omitted in good faith and in accordance with such opinion.

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      (c) The General Partner shall have the right, in respect of any of its
powers or obligations hereunder, to act through any of its duly authorized
officers, a duly appointed attorney or attorneys-in-fact or the duly authorized
officers of the Partnership.

      (d) Any standard of care and duty imposed by this Agreement or under the
Delaware Act or any applicable law, rule or regulation shall be modified, waived
or limited, to the extent permitted by law, as required to permit the General
Partner to act under this Agreement or any other agreement contemplated by this
Agreement and to make any decision pursuant to the authority prescribed in this
Agreement, so long as such action is reasonably believed by the General Partner
to be in, or not inconsistent with, the best interests of the Partnership.

Section 7.11 Purchase or Sale of Partnership Securities.

      The General Partner may cause the Partnership to purchase or otherwise
acquire Partnership Securities; provided that, except as permitted pursuant to
Section 4.10, the General Partner may not cause any Group Member to purchase
Subordinated Units during the Subordination Period. As long as Partnership
Securities are held by any Group Member, such Partnership Securities shall not
be considered Outstanding for any purpose, except as otherwise provided herein.
The General Partner or any Affiliate of the General Partner may also purchase or
otherwise acquire and sell or otherwise dispose of Partnership Securities for
its own account, subject to the provisions of Articles IV and X.

Section 7.12 Registration Rights of the General Partner and its Affiliates.

      (a) If (i) the General Partner or any Affiliate of the General Partner
(including for purposes of this Section 7.12, any Person that is an Affiliate of
the General Partner at the date hereof notwithstanding that it may later cease
to be an Affiliate of the General Partner) holds Partnership Securities that it
desires to sell and (ii) Rule 144 of the Securities Act (or any successor rule
or regulation to Rule 144) or another exemption from registration is not
available to enable such holder of Partnership Securities (the "Holder") to
dispose of the number of Partnership Securities it desires to sell at the time
it desires to do so without registration under the Securities Act, then upon the
request of the General Partner or any of its Affiliates, the Partnership shall
file with the Commission as promptly as practicable after receiving such
request, and use all reasonable efforts to cause to become effective and remain
effective for a period of not less than six months following its effective date
or such shorter period as shall terminate when all Partnership Securities
covered by such registration statement have been sold, a registration statement
under the Securities Act registering the offering and sale of the number of
Partnership Securities specified by the Holder; provided, however, that the
Partnership shall not be required to effect more than three registrations
pursuant to this Section 7.12(a); and provided further, however, that if the
Conflicts Committee determines in its good faith judgment that a postponement of
the requested registration for up to six months would be in the best interests
of the Partnership and its Partners due to a pending transaction, investigation
or other event, the filing of such registration statement or the effectiveness
thereof may be deferred for up to six months, but not thereafter. In connection
with any registration pursuant to the immediately preceding sentence, the
Partnership shall promptly prepare and file (x) such documents as may be
necessary to register or qualify the securities subject to such registration
under the securities laws of such states as the Holder shall reasonably request;
provided, however, that no such

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qualification shall be required in any jurisdiction where, as a result thereof,
the Partnership would become subject to general service of process or to
taxation or qualification to do business as a foreign corporation or partnership
doing business in such jurisdiction solely as a result of such registration, and
(y) such documents as may be necessary to apply for listing or to list the
Partnership Securities subject to such registration on such National Securities
Exchange as the Holder shall reasonably request, and do any and all other acts
and things that may reasonably be necessary or advisable to enable the Holder to
consummate a public sale of such Partnership Securities in such states. Except
as set forth in Section 7.12(c), all costs and expenses of any such registration
and offering (other than the underwriting discounts and commissions) shall be
paid by the Partnership, without reimbursement by the Holder.

      (b) If the Partnership shall at any time propose to file a registration
statement under the Securities Act for an offering of equity securities of the
Partnership for cash (other than an offering relating solely to an employee
benefit plan), the Partnership shall use all reasonable efforts to include such
number or amount of securities held by the Holder in such registration statement
as the Holder shall request. If the proposed offering pursuant to this Section
7.12(b) shall be an underwritten offering, then, in the event that the managing
underwriter or managing underwriters of such offering advise the Partnership and
the Holder in writing that in their opinion the inclusion of all or some of the
Holder's Partnership Securities would adversely and materially affect the
success of the offering, the Partnership shall include in such offering only
that number or amount, if any, of securities held by the Holder that, in the
opinion of the managing underwriter or managing underwriters, will not so
adversely and materially affect the offering. Except as set forth in Section
7.12(c), all costs and expenses of any such registration and offering (other
than the underwriting discounts and commissions) shall be paid by the
Partnership, without reimbursement by the Holder.

      (c) If underwriters are engaged in connection with any registration
referred to in this Section 7.12, the Partnership shall provide indemnification,
representations, covenants, opinions and other assurance to the underwriters in
form and substance reasonably satisfactory to such underwriters. Further, in
addition to and not in limitation of the Partnership's obligation under Section
7.7, the Partnership shall, to the fullest extent permitted by law, indemnify
and hold harmless the Holder, its officers, directors and each Person who
controls the Holder (within the meaning of the Securities Act) and any agent
thereof (collectively, "Indemnified Persons") against any losses, claims,
demands, actions, causes of action, assessments, damages, liabilities (joint or
several), costs and expenses (including interest, penalties and reasonable
attorneys' fees and disbursements), resulting to, imposed upon, or incurred by
the Indemnified Persons, directly or indirectly, under the Securities Act or
otherwise (hereinafter referred to in this Section 7.12(c) as a "claim" and in
the plural as "claims") based upon, arising out of or resulting from any untrue
statement or alleged untrue statement of any material fact contained in any
registration statement under which any Partnership Securities were registered
under the Securities Act or any state securities or Blue Sky laws, in any
preliminary prospectus (if used prior to the effective date of such registration
statement), or in any summary or final prospectus or in any amendment or
supplement thereto (if used during the period the Partnership is required to
keep the registration statement current), or arising out of, based upon or
resulting from the omission or alleged omission to state therein a material fact
required to be stated therein or necessary to make the statements made therein
not misleading; provided, however, that the Partnership shall not be liable to
any Indemnified Person to the extent that any such claim arises out of, is based
upon or

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results from an untrue statement or alleged untrue statement or omission
or alleged omission made in such registration statement, such preliminary,
summary or final prospectus or such amendment or supplement, in reliance upon
and in conformity with written information furnished to the Partnership by or on
behalf of such Indemnified Person specifically for use in the preparation
thereof.

      (d) The provisions of Section 7.12(a) and 7.12(b) shall continue to be
applicable with respect to the General Partner (and any of the General Partner's
Affiliates) after it ceases to be a Partner of the Partnership, during a period
of two years subsequent to the effective date of such cessation and for so long
thereafter as is required for the Holder to sell all of the Partnership
Securities with respect to which it has requested during such two-year period
inclusion in a registration statement otherwise filed or that a registration
statement be filed; provided, however, that the Partnership shall not be
required to file successive registration statements covering the same
Partnership Securities for which registration was demanded during such two-year
period. The provisions of Section 7.12(c) shall continue in effect thereafter.

      (e) Any request to register Partnership Securities pursuant to this
Section 7.12 shall (i) specify the Partnership Securities intended to be offered
and sold by the Person making the request, (ii) express such Person's present
intent to offer such Partnership Securities for distribution, (iii) describe the
nature or method of the proposed offer and sale of Partnership Securities, and
(iv) contain the undertaking of such Person to provide all such information and
materials and take all action as may be required in order to permit the
Partnership to comply with all applicable requirements in connection with the
registration of such Partnership Securities.

Section 7.13 Reliance by Third Parties.

      Notwithstanding anything to the contrary in this Agreement, any Person
dealing with the Partnership shall be entitled to assume that the General
Partner and any officer of the General Partner authorized by the General Partner
to act on behalf of and in the name of the Partnership has full power and
authority to encumber, sell or otherwise use in any manner any and all assets of
the Partnership and to enter into any authorized contracts on behalf of the
Partnership, and such Person shall be entitled to deal with the General Partner
or any such officer as if it were the Partnership's sole party in interest, both
legally and beneficially. Each Limited Partner hereby waives any and all
defenses or other remedies that may be available against such Person to contest,
negate or disaffirm any action of the General Partner or any such officer in
connection with any such dealing. In no event shall any Person dealing with the
General Partner or any such officer or its representatives be obligated to
ascertain that the terms of this Agreement have been complied with or to inquire
into the necessity or expedience of any act or action of the General Partner or
any such officer or its representatives. Each and every certificate, document or
other instrument executed on behalf of the Partnership by the General Partner or
its representatives shall be conclusive evidence in favor of any and every
Person relying thereon or claiming thereunder that (a) at the time of the
execution and delivery of such certificate, document or instrument, this
Agreement was in full force and effect, (b) the Person executing and delivering
such certificate, document or instrument was duly authorized and empowered to do
so for and on behalf of the Partnership and (c) such certificate, document or
instrument was duly executed and delivered in accordance with the terms and
provisions of this Agreement and is binding upon the Partnership.

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                                  ARTICLE VIII

                     BOOKS, RECORDS, ACCOUNTING AND REPORTS

Section 8.1 Records and Accounting.

      The General Partner shall keep or cause to be kept at the principal office
of the Partnership appropriate books and records with respect to the
Partnership's business, including all books and records necessary to provide to
the Limited Partners any information required to be provided pursuant to Section
3.4(a). Any books and records maintained by or on behalf of the Partnership in
the regular course of its business, including the record of the Record Holders
and Assignees of Units or other Partnership Securities, books of account and
records of Partnership proceedings, may be kept on, or be in the form of,
computer disks, hard drives, punch cards, magnetic tape, photographs,
micrographics or any other information storage device; provided, that the books
and records so maintained are convertible into clearly legible written form
within a reasonable period of time. The books of the Partnership shall be
maintained, for financial reporting purposes, on an accrual basis in accordance
with U.S. GAAP.

Section 8.2 Fiscal Year.

      The fiscal year of the Partnership shall be a fiscal year ending December
31.

Section 8.3 Reports.

      (a) As soon as practicable, but in no event later than 120 days after the
close of each fiscal year of the Partnership, the General Partner shall cause to
be mailed or made available to each Record Holder of a Unit as of a date
selected by the General Partner in its discretion, an annual report containing
financial statements of the Partnership for such fiscal year of the Partnership,
presented in accordance with U.S. GAAP, including a balance sheet and statements
of operations, Partnership equity and cash flows, such statements to be audited
by a firm of independent public accountants selected by the General Partner.

      (b) As soon as practicable, but in no event later than 90 days after the
close of each Quarter except the last Quarter of each fiscal year, the General
Partner shall cause to be mailed or made available to each Record Holder of a
Unit, as of a date selected by the General Partner in its discretion, a report
containing unaudited financial statements of the Partnership and such other
information as may be required by applicable law, regulation or rule of any
National Securities Exchange on which the Units are listed for trading, or as
the General Partner determines to be necessary or appropriate.

                                   ARTICLE IX

                                   TAX MATTERS

Section 9.1 Tax Returns and Information.

      The Partnership shall timely file all returns of the Partnership that are
required for federal, state and local income tax purposes on a taxable year
ending on December 31 or such

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other period as may be required by law, as determined by the General Partner in
good faith. The tax information reasonably required by Record Holders for
federal and state income tax reporting purposes with respect to a taxable year
shall be furnished to them within 90 days of the close of the calendar year in
which the Partnership's taxable year ends. The classification, realization and
recognition of income, gain, losses and deductions and other items shall be on
the accrual method of accounting for federal income tax purposes.

Section 9.2 Tax Elections.

      (a) The Partnership shall make the election under Section 754 of the Code
in accordance with applicable regulations thereunder, subject to the reservation
of the right to seek to revoke any such election upon the General Partner's
determination that such revocation is in the best interests of the Limited
Partners. Notwithstanding any other provision herein contained, for the purposes
of computing the adjustments under Section 743(b) of the Code, the General
Partner shall be authorized (but not required) to adopt a convention whereby the
price paid by a transferee of a Limited Partner Interest will be deemed to be
the lowest quoted closing price of the Limited Partner Interests on any National
Securities Exchange on which such Limited Partner Interests are traded during
the calendar month in which such transfer is deemed to occur pursuant to Section
6.2(g) without regard to the actual price paid by such transferee.

      (b) The Partnership shall elect to deduct expenses incurred in organizing
the Partnership ratably over a sixty-month period as provided in Section 709 of
the Code.

      (c) Except as otherwise provided herein, the General Partner shall
determine whether the Partnership should make any other elections permitted by
the Code.

Section 9.3 Tax Controversies.

      Subject to the provisions hereof, the General Partner is designated as the
Tax Matters Partner (as defined in the Code) and is authorized and required to
represent the Partnership (at the Partnership's expense) in connection with all
examinations of the Partnership's affairs by tax authorities, including
resulting administrative and judicial proceedings, and to expend Partnership
funds for professional services and costs associated therewith. Each Partner
agrees to cooperate with the General Partner and to do or refrain from doing any
or all things reasonably required by the General Partner to conduct such
proceedings.

Section 9.4 Withholding.

      The General Partner is authorized to take any action that it determines in
its discretion to be necessary or appropriate to cause the Partnership and other
Group Members to comply with any withholding requirements established under the
Code or any other federal, state or local law including, without limitation,
pursuant to Sections 1441, 1442, 1445 and 1446 of the Code. To the extent that
the Partnership is required or elects to withhold and pay over to any taxing
authority any amount resulting from the allocation or distribution of income to
any Partner or Assignee (including, without limitation, by reason of Section
1446 of the Code), the amount withheld may at the discretion of the General
Partner be treated by the Partnership as a distribution of cash pursuant to the
then applicable provision of this Agreement in the amount of such withholding
from such Partner.

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                                   ARTICLE X

                              ADMISSION OF PARTNERS

Section 10.1 Admission of Initial Limited Partners.

      Upon the issuance by the Partnership of Common Units, Subordinated Units
and Incentive Distribution Rights to the General Partner, Crosstex Energy, Inc.
and the Underwriters as described in Sections 5.2 and 5.3 in connection with the
Initial Offering, the General Partner shall admit such parties to the
Partnership as Initial Limited Partners in respect of the Common Units,
Subordinated Units or Incentive Distribution Rights issued to them.

Section 10.2 Admission of Substituted Limited Partner.

      By transfer of a Limited Partner Interest in accordance with Article IV,
the transferor shall be deemed to have given the transferee the right to seek
admission as a Substituted Limited Partner subject to the conditions of, and in
the manner permitted under, this Agreement. A transferor of a Certificate
representing a Limited Partner Interest shall, however, only have the authority
to convey to a purchaser or other transferee who does not execute and deliver a
Transfer Application (a) the right to negotiate such Certificate to a purchaser
or other transferee and (b) the right to transfer the right to request admission
as a Substituted Limited Partner to such purchaser or other transferee in
respect of the transferred Limited Partner Interests. Each transferee of a
Limited Partner Interest (including any nominee holder or an agent acquiring
such Limited Partner Interest for the account of another Person) who executes
and delivers a Transfer Application shall, by virtue of such execution and
delivery, be an Assignee and be deemed to have applied to become a Substituted
Limited Partner with respect to the Limited Partner Interests so transferred to
such Person. Such Assignee shall become a Substituted Limited Partner (x) at
such time as the General Partner consents thereto, which consent may be given or
withheld in the General Partner's discretion, and (y) when any such admission is
shown on the books and records of the Partnership. If such consent is withheld,
such transferee shall be an Assignee. An Assignee shall have an interest in the
Partnership equivalent to that of a Limited Partner with respect to allocations
and distributions, including liquidating distributions, of the Partnership. With
respect to voting rights attributable to Limited Partner Interests that are held
by Assignees, the General Partner shall be deemed to be the Limited Partner with
respect thereto and shall, in exercising the voting rights in respect of such
Limited Partner Interests on any matter, vote such Limited Partner Interests at
the written direction of the Assignee who is the Record Holder of such Limited
Partner Interests. If no such written direction is received, such Limited
Partner Interests will not be voted. An Assignee shall have no other rights of a
Limited Partner.

Section 10.3 Admission of Successor General Partner.

      A successor General Partner approved pursuant to Section 11.1 or 11.2 or
the transferee of or successor to all of the General Partner Interest pursuant
to Section 4.6 who is proposed to be admitted as a successor General Partner
shall be admitted to the Partnership as the General Partner, effective
immediately prior to the withdrawal or removal of the predecessor or
transferring General Partner, pursuant to Section 11.1 or 11.2 or the transfer
of the General

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Partner Interest pursuant to Section 4.6; provided, however, that no such
successor shall be admitted to the Partnership until compliance with the terms
of Section 4.6 has occurred and such successor has executed and delivered such
other documents or instruments as may be required to effect such admission. Any
such successor shall, subject to the terms hereof, carry on the business of the
members of the Partnership Group without dissolution.

Section 10.4 Admission of Additional Limited Partners.

      (a) A Person (other than the General Partner, an Initial Limited Partner
or a Substituted Limited Partner) who makes a Capital Contribution to the
Partnership in accordance with this Agreement shall be admitted to the
Partnership as an Additional Limited Partner only upon furnishing to the General
Partner

            (i) evidence of acceptance in form satisfactory to the General
      Partner of all of the terms and conditions of this Agreement, including
      the power of attorney granted in Section 2.6, and

            (ii) such other documents or instruments as may be required in the
      discretion of the General Partner to effect such Person's admission as an
      Additional Limited Partner.

      (b) Notwithstanding anything to the contrary in this Section 10.4, no
Person shall be admitted as an Additional Limited Partner without the consent of
the General Partner, which consent may be given or withheld in the General
Partner's discretion. The admission of any Person as an Additional Limited
Partner shall become effective on the date upon which the name of such Person is
recorded as such in the books and records of the Partnership, following the
consent of the General Partner to such admission.

      (c) Effective as of the date of original issuance of the Senior
Subordinated Units, Kayne Anderson MLP Investment Company, Tortoise Energy
Capital Corporation and Tortoise Energy Infrastructure Corporation were each
admitted to the Partnership as an Additional Limited Partner and the General
Partner consented to such admission.

      (d) Effective as of the date of original issuance of the Senior
Subordinated Series B Units, Kayne Anderson MLP Investment Company, Kayne
Anderson Energy Total Return Fund, Inc., Tortoise Energy Capital Corporation,
Tortoise Energy Infrastructure Corporation and Fiduciary/Claymore MLP
Opportunity Fund are each hereby admitted to the Partnership as an Additional
Limited Partner and the General Partner hereby consents to such admission.

Section 10.5 Amendment of Agreement and Certificate of Limited Partnership.

      To effect the admission to the Partnership of any Partner, the General
Partner shall take all steps necessary and appropriate under the Delaware Act to
amend the records of the Partnership to reflect such admission and, if
necessary, to prepare as soon as practicable an amendment to this Agreement and,
if required by law, the General Partner shall prepare and file an amendment to
the Certificate of Limited Partnership, and the General Partner may for this
purpose, among others, exercise the power of attorney granted pursuant to
Section 2.6.

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                                   ARTICLE XI

                        WITHDRAWAL OR REMOVAL OF PARTNERS

Section 11.1 Withdrawal of the General Partner.

      (a) The General Partner shall be deemed to have withdrawn from the
Partnership upon the occurrence of any one of the following events (each such
event herein referred to as an "Event of Withdrawal");

            (i) The General Partner voluntarily withdraws from the Partnership
      by giving written notice to the other Partners;

            (ii) The General Partner transfers all of its rights as General
      Partner pursuant to Section 4.6;

            (iii) The General Partner is removed pursuant to Section 11.2;

            (iv) The General Partner (A) makes a general assignment for the
      benefit of creditors; (B) files a voluntary bankruptcy petition for relief
      under Chapter 7 of the United States Bankruptcy Code; (C) files a petition
      or answer seeking for itself a liquidation, dissolution or similar relief
      (but not a reorganization) under any law; (D) files an answer or other
      pleading admitting or failing to contest the material allegations of a
      petition filed against the General Partner in a proceeding of the type
      described in clauses (A)-(C) of this Section 11.1(a)(iv); or (E) seeks,
      consents to or acquiesces in the appointment of a trustee (but not a
      debtor-in-possession), receiver or liquidator of the General Partner or of
      all or any substantial part of its properties;

            (v) A final and non-appealable order of relief under Chapter 7 of
      the United States Bankruptcy Code is entered by a court with appropriate
      jurisdiction pursuant to a voluntary or involuntary petition by or against
      the General Partner; or

            (vi) (A) in the event the General Partner is a corporation, a
      certificate of dissolution or its equivalent is filed for the General
      Partner, or 90 days expire after the date of notice to the General Partner
      of revocation of its charter without a reinstatement of its charter, under
      the laws of its state of incorporation; (B) in the event the General
      Partner is a partnership or a limited liability company, the dissolution
      and commencement of winding up of the General Partner; (C) in the event
      the General Partner is acting in such capacity by virtue of being a
      trustee of a trust, the termination of the trust; (D) in the event the
      General Partner is a natural person, his death or adjudication of
      incompetency; and (E) otherwise in the event of the termination of the
      General Partner.

If an Event of Withdrawal specified in Section 11.1(a)(iv), (v) or (vi)(A), (B),
(C) or (E) occurs, the withdrawing General Partner shall give notice to the
Limited Partners within 30 days after such occurrence. The Partners hereby agree
that only the Events of Withdrawal described in this Section 11.1 shall result
in the withdrawal of the General Partner from the Partnership.

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      (b) Withdrawal of the General Partner from the Partnership upon the
occurrence of an Event of Withdrawal shall not constitute a breach of this
Agreement under the following circumstances: (i) at any time during the period
beginning on the Closing Date and ending at 12:00 midnight, Eastern Standard
Time, on December 31, 2012, the General Partner voluntarily withdraws by giving
at least 90 days' advance notice of its intention to withdraw to the Limited
Partners; provided that prior to the effective date of such withdrawal, the
withdrawal is approved by Unitholders holding at least a majority of the
Outstanding Common Units (excluding Common Units held by the General Partner and
its Affiliates) and the General Partner delivers to the Partnership an Opinion
of Counsel ("Withdrawal Opinion of Counsel") that such withdrawal (following the
selection of the successor General Partner) would not result in the loss of the
limited liability of any Limited Partner or any Group Member or cause any Group
Member to be treated as an association taxable as a corporation or otherwise to
be taxed as an entity for federal income tax purposes (to the extent not
previously treated as such); (ii) at any time after 12:00 midnight, Eastern
Standard Time, on December 31, 2012, the General Partner voluntarily withdraws
by giving at least 90 days' advance notice to the Unitholders, such withdrawal
to take effect on the date specified in such notice; (iii) at any time that the
General Partner ceases to be the General Partner pursuant to Section 11.1(a)(ii)
or is removed pursuant to Section 11.2; or (iv) notwithstanding clause (i) of
this sentence, at any time that the General Partner voluntarily withdraws by
giving at least 90 days' advance notice of its intention to withdraw to the
Limited Partners, such withdrawal to take effect on the date specified in the
notice, if at the time such notice is given one Person and its Affiliates (other
than the General Partner and its Affiliates) own beneficially or of record or
control at least 50% of the Outstanding Units. The withdrawal of the General
Partner from the Partnership upon the occurrence of an Event of Withdrawal shall
also constitute the withdrawal of the General Partner as general partner or
managing member, to the extent applicable, of the other Group Members. If the
General Partner gives a notice of withdrawal pursuant to Section 11.1(a)(i), the
holders of a Unit Majority, may, prior to the effective date of such withdrawal,
elect a successor General Partner. The Person so elected as successor General
Partner shall automatically become the successor general partner or managing
member, to the extent applicable, of the other Group Members of which the
General Partner is a general partner or a managing member. If, prior to the
effective date of the General Partner's withdrawal, a successor is not selected
by the Unitholders as provided herein or the Partnership does not receive a
Withdrawal Opinion of Counsel, the Partnership shall be dissolved in accordance
with Section 12.1. Any successor General Partner elected in accordance with the
terms of this Section 11.1 shall be subject to the provisions of Section 10.3.

Section 11.2 Removal of the General Partner.

      The General Partner may be removed if such removal is approved by the
Unitholders holding at least 66-2/3% of the Outstanding Units (including Units
held by the General Partner and its Affiliates). Any such action by such holders
for removal of the General Partner must also provide for the election of a
successor General Partner by the Unitholders holding a majority of the
outstanding Common Units voting as a class and a majority of the outstanding
Senior Subordinated Units, Senior Subordinated Series B Units and the
Subordinated Units voting as a single class (including Units held by the General
Partner and its Affiliates). Such removal shall be effective immediately
following the admission of a successor General Partner pursuant to Section 10.3.
The removal of the General Partner shall also automatically constitute the
removal of the General Partner as general partner or managing member, to the
extent applicable, of the

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other Group Members of which the General Partner is a general partner or a
managing member. If a Person is elected as a successor General Partner in
accordance with the terms of this Section 11.2, such Person shall, upon
admission pursuant to Section 10.3, automatically become a successor general
partner or managing member, to the extent applicable, of the other Group Members
of which the General Partner is a general partner or a managing member. The
right of the holders of Outstanding Units to remove the General Partner shall
not exist or be exercised unless the Partnership has received an opinion opining
as to the matters covered by a Withdrawal Opinion of Counsel. Any successor
General Partner elected in accordance with the terms of this Section 11.2 shall
be subject to the provisions of Section 10.3.

Section 11.3 Interest of Departing Partner and Successor General Partner.

      (a) In the event of (i) withdrawal of the General Partner under
circumstances where such withdrawal does not violate this Agreement or (ii)
removal of the General Partner by the holders of Outstanding Units under
circumstances where Cause does not exist, if the successor General Partner is
elected in accordance with the terms of Section 11.1 or 11.2, the Departing
Partner shall have the option, exercisable prior to the effective date of the
departure of such Departing Partner, to require its successor to purchase its
General Partner Interest and its general partner interest (or equivalent
interest), if any, in the other Group Members and all of its Incentive
Distribution Rights (collectively, the "Combined Interest") in exchange for an
amount in cash equal to the fair market value of such Combined Interest, such
amount to be determined and payable as of the effective date of its departure.
If the General Partner is removed by the Unitholders under circumstances where
Cause exists or if the General Partner withdraws under circumstances where such
withdrawal violates this Agreement, and if a successor General Partner is
elected in accordance with the terms of Section 11.1 or 11.2, such successor
shall have the option, exercisable prior to the effective date of the departure
of such Departing Partner, to purchase the Combined Interest for such fair
market value of such Combined Interest of the Departing Partner. In either
event, the Departing Partner shall be entitled to receive all reimbursements due
such Departing Partner pursuant to Section 7.4, including any employee-related
liabilities (including severance liabilities), incurred in connection with the
termination of any employees employed by the Departing Partner for the benefit
of the Partnership or the other Group Members.

      For purposes of this Section 11.3(a), the fair market value of the
Departing Partner's Combined Interest shall be determined by agreement between
the Departing Partner and its successor or, failing agreement within 30 days
after the effective date of such Departing Partner's departure, by an
independent investment banking firm or other independent expert selected by the
Departing Partner and its successor, which, in turn, may rely on other experts,
and the determination of which shall be conclusive as to such matter. If such
parties cannot agree upon one independent investment banking firm or other
independent expert within 45 days after the effective date of such departure,
then the Departing Partner shall designate an independent investment banking
firm or other independent expert, the Departing Partner's successor shall
designate an independent investment banking firm or other independent expert,
and such firms or experts shall mutually select a third independent investment
banking firm or independent expert, which third independent investment banking
firm or other independent expert shall determine the fair market value of the
Combined Interest of the Departing Partner. In making its determination, such
third independent investment banking firm or other independent expert may
consider the

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then current trading price of Units on any National Securities Exchange on which
Units are then listed, the value of the Partnership's assets, the rights and
obligations of the Departing Partner and other factors it may deem relevant.

      (b) If the Combined Interest is not purchased in the manner set forth in
Section 11.3(a), the Departing Partner (or its transferee) shall become a
Limited Partner and its Combined Interest shall be converted into Common Units
pursuant to a valuation made by an investment banking firm or other independent
expert selected pursuant to Section 11.3(a), without reduction in such
Partnership Interest (but subject to proportionate dilution by reason of the
admission of its successor). Any successor General Partner shall indemnify the
Departing Partner (or its transferee) as to all debts and liabilities of the
Partnership arising on or after the date on which the Departing Partner (or its
transferee) becomes a Limited Partner. For purposes of this Agreement,
conversion of the Combined Interest of the Departing Partner to Common Units
will be characterized as if the Departing Partner (or its transferee)
contributed its Combined Interest to the Partnership in exchange for the newly
issued Common Units.

      (c) If a successor General Partner is elected in accordance with the terms
of Section 11.1 or 11.2 and the option described in Section 11.3(a) is not
exercised by the party entitled to do so, the successor General Partner shall,
at the effective date of its admission to the Partnership, contribute to the
Partnership cash in the amount equal to 2/98ths of the Net Agreed Value of the
Partnership's assets on such date. In such event, such successor General Partner
shall, subject to the following sentence, be entitled to 2% of all Partnership
allocations and distributions to which the Departing Partner was entitled. In
addition, the successor General Partner shall cause this Agreement to be amended
to reflect that, from and after the date of such successor General Partner's
admission, the successor General Partner's interest in all Partnership
distributions and allocations shall be 2%.

Section 11.4 Termination of Subordination Period, Conversion of Subordinated
             Units and Extinguishment of Cumulative Common Unit Arrearages.

      Notwithstanding any provision of this Agreement, if the General Partner is
removed as general partner of the Partnership under circumstances where Cause
does not exist and Units held by the General Partner and its Affiliates are not
voted in favor of such removal, (i) the Subordination Period will end and all
Outstanding Subordinated Units will immediately and automatically convert into
Common Units on a one-for-one basis and (ii) all Cumulative Common Unit
Arrearages on the Common Units will be extinguished.

Section 11.5 Withdrawal of Limited Partners.

      No Limited Partner shall have any right to withdraw from the Partnership;
provided, however, that when a transferee of a Limited Partner's Limited Partner
Interest becomes a Record Holder of the Limited Partner Interest so transferred,
such transferring Limited Partner shall cease to be a Limited Partner with
respect to the Limited Partner Interest so transferred.

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                                  ARTICLE XII

                           DISSOLUTION AND LIQUIDATION

Section 12.1 Dissolution.

      The Partnership shall not be dissolved by the admission of Substituted
Limited Partners or Additional Limited Partners or by the admission of a
successor General Partner in accordance with the terms of this Agreement. Upon
the removal or withdrawal of the General Partner, if a successor General Partner
is elected pursuant to Section 11.1 or 11.2, the Partnership shall not be
dissolved and such successor General Partner shall continue the business of the
Partnership. The Partnership shall dissolve, and (subject to Section 12.2) its
affairs shall be wound up, upon:

      (a) an Event of Withdrawal of the General Partner as provided in Section
11.1(a) (other than Section 11.1(a)(ii)), unless a successor is elected and an
Opinion of Counsel is received as provided in Section 11.1(b) or 11.2 and such
successor is admitted to the Partnership pursuant to Section 10.3;

      (b) an election to dissolve the Partnership by the General Partner that is
approved by the holders of a Unit Majority;

      (c) the entry of a decree of judicial dissolution of the Partnership
pursuant to the provisions of the Delaware Act; or

      (d) the sale of all or substantially all of the assets and properties of
the Partnership Group.

Section 12.2 Continuation of the Business of the Partnership After Dissolution.

      Upon (a) dissolution of the Partnership following an Event of Withdrawal
caused by the withdrawal or removal of the General Partner as provided in
Section 11.1(a)(i) or (iii) and the failure of the Partners to select a
successor to such Departing Partner pursuant to Section 11.1 or 11.2, then
within 90 days thereafter, or (b) dissolution of the Partnership upon an event
constituting an Event of Withdrawal as defined in Section 11.1(a)(iv), (v) or
(vi), then, to the maximum extent permitted by law, within 180 days thereafter,
the holders of a Unit Majority may elect to reconstitute the Partnership and
continue its business on the same terms and conditions set forth in this
Agreement by forming a new limited partnership on terms identical to those set
forth in this Agreement and having as the successor General partner a Person
approved by the holders of a Unit Majority. Unless such an election is made
within the applicable time period as set forth above, the Partnership shall
conduct only activities necessary to wind up its affairs. If such an election is
so made, then:

            (i) the reconstituted Partnership shall continue unless earlier
      dissolved in accordance with this Article XII;

            (ii) if the successor General Partner is not the former General
      Partner, then the interest of the former General Partner shall be treated
      in the manner provided in Section 11.3; and

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            (iii) all necessary steps shall be taken to cancel this Agreement
      and the Certificate of Limited Partnership and to enter into and, as
      necessary, to file a new partnership agreement and certificate of limited
      partnership, and the successor General Partner may for this purpose
      exercise the powers of attorney granted the General Partner pursuant to
      Section 2.6; provided, that the right of the holders of a Unit Majority to
      approve a successor General Partner and to reconstitute and to continue
      the business of the Partnership shall not exist and may not be exercised
      unless the Partnership has received an Opinion of Counsel that (x) the
      exercise of the right would not result in the loss of limited liability of
      any Limited Partner and (y) neither the Partnership, the reconstituted
      limited partnership nor the Operating Partnership or any other Group
      Member would be treated as an association taxable as a corporation or
      otherwise be taxable as an entity for federal income tax purposes upon the
      exercise of such right to continue.

Section 12.3 Liquidator.

      Upon dissolution of the Partnership, unless the Partnership is continued
under an election to reconstitute and continue the Partnership pursuant to
Section 12.2, the General Partner shall select one or more Persons to act as
Liquidator. The Liquidator (if other than the General Partner) shall be entitled
to receive such compensation for its services as may be approved by holders of
at least a majority of the Outstanding Common Units, Senior Subordinated Units,
Senior Subordinated Series B Units and Subordinated Units voting as a single
class. The Liquidator (if other than the General Partner) shall agree not to
resign at any time without 15 days' prior notice and may be removed at any time,
with or without cause, by notice of removal approved by holders of at least a
majority of the Outstanding Common Units, Senior Subordinated Units, Senior
Subordinated Series B Units and Subordinated Units voting as a single class.
Upon dissolution, removal or resignation of the Liquidator, a successor and
substitute Liquidator (who shall have and succeed to all rights, powers and
duties of the original Liquidator) shall within 30 days thereafter be approved
by holders of at least a majority of the Outstanding Common Units, Senior
Subordinated Units, Senior Subordinated Series B Units and Subordinated Units
voting as a single class. The right to approve a successor or substitute
Liquidator in the manner provided herein shall be deemed to refer also to any
such successor or substitute Liquidator approved in the manner herein provided.
Except as expressly provided in this Article XII, the Liquidator approved in the
manner provided herein shall have and may exercise, without further
authorization or consent of any of the parties hereto, all of the powers
conferred upon the General Partner under the terms of this Agreement (but
subject to all of the applicable limitations, contractual and otherwise, upon
the exercise of such powers, other than the limitation on sale set forth in
Section 7.3(b)) to the extent necessary or desirable in the good faith judgment
of the Liquidator to carry out the duties and functions of the Liquidator
hereunder for and during such period of time as shall be reasonably required in
the good faith judgment of the Liquidator to complete the winding up and
liquidation of the Partnership as provided for herein.

Section 12.4 Liquidation.

      The Liquidator shall proceed to dispose of the assets of the Partnership,
discharge its liabilities, and otherwise wind up its affairs in such manner and
over such period as the

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Liquidator determines to be in the best interest of the Partners, subject to
Section 17-804 of the Delaware Act and the following:

      (a) The assets may be disposed of by public or private sale or by
distribution in kind to one or more Partners on such terms as the Liquidator and
such Partner or Partners may agree. If any property is distributed in kind, the
Partner receiving the property shall be deemed for purposes of Section 12.4(c)
to have received cash equal to its fair market value; and contemporaneously
therewith, appropriate cash distributions must be made to the other Partners.
The Liquidator may, in its absolute discretion, defer liquidation or
distribution of the Partnership's assets for a reasonable time if it determines
that an immediate sale or distribution of all or some of the Partnership's
assets would be impractical or would cause undue loss to the Partners. The
Liquidator may, in its absolute discretion, distribute the Partnership's assets,
in whole or in part, in kind if it determines that a sale would be impractical
or would cause undue loss to the Partners.

      (b) Liabilities of the Partnership include amounts owed to the Liquidator
as compensation for serving in such capacity (subject to the terms of Section
12.3) and amounts to Partners otherwise than in respect of their distribution
rights under Article VI. With respect to any liability that is contingent,
conditional or unmatured or is otherwise not yet due and payable, the Liquidator
shall either settle such claim for such amount as it thinks appropriate or
establish a reserve of cash or other assets to provide for its payment. When
paid, any unused portion of the reserve shall be distributed as additional
liquidation proceeds.

      (c) All property and all cash in excess of that required to discharge
liabilities as provided in Section 12.4(b) shall be distributed to the Partners
in accordance with, and to the extent of, the positive balances in their
respective Capital Accounts, as determined after taking into account all Capital
Account adjustments (other than those made by reason of distributions pursuant
to this Section 12.4(c)) for the taxable year of the Partnership during which
the liquidation of the Partnership occurs (with such date of occurrence being
determined pursuant to Treasury Regulation Section 1.704-1(b)(2)(ii)(g)), and
such distribution shall be made by the end of such taxable year (or, if later,
within 90 days after said date of such occurrence).

Section 12.5 Cancellation of Certificate of Limited Partnership.

      Upon the completion of the distribution of Partnership cash and property
as provided in Section 12.4 in connection with the liquidation of the
Partnership, the Partnership shall be terminated and the Certificate of Limited
Partnership and all qualifications of the Partnership as a foreign limited
partnership in jurisdictions other than the State of Delaware shall be canceled
and such other actions as may be necessary to terminate the Partnership shall be
taken.

Section 12.6 Return of Contributions.

      The General Partner shall not be personally liable for, and shall have no
obligation to contribute or loan any monies or property to the Partnership to
enable it to effectuate, the return of the Capital Contributions of the Limited
Partners or Unitholders, or any portion thereof, it being expressly understood
that any such return shall be made solely from Partnership assets.

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Section 12.7 Waiver of Partition.

      To the maximum extent permitted by law, each Partner hereby waives any
right to partition of the Partnership property.

Section 12.8 Capital Account Restoration.

      No Limited Partner shall have any obligation to restore any negative
balance in its Capital Account upon liquidation of the Partnership. The General
Partner shall be obligated to restore any negative balance in its Capital
Account upon liquidation of its interest in the Partnership by the end of the
taxable year of the Partnership during which such liquidation occurs, or, if
later, within 90 days after the date of such liquidation.

                                  ARTICLE XIII

            AMENDMENT OF PARTNERSHIP AGREEMENT; MEETINGS; RECORD DATE

Section 13.1 Amendment to be Adopted Solely by the General Partner.

      Each Partner agrees that the General Partner, without the approval of any
Partner or Assignee, may amend any provision of this Agreement and execute,
swear to, acknowledge, deliver, file and record whatever documents may be
required in connection therewith, to reflect:

      (a) a change in the name of the Partnership, the location of the principal
place of business of the Partnership, the registered agent of the Partnership or
the registered office of the Partnership;

      (b) admission, substitution, withdrawal or removal of Partners in
accordance with this Agreement;

      (c) a change that, in the sole discretion of the General Partner, is
necessary or advisable to qualify or continue the qualification of the
Partnership as a limited partnership or a partnership in which the Limited
Partners have limited liability under the laws of any state or to ensure that
the Group Members will not be treated as associations taxable as corporations or
otherwise taxed as entities for federal income tax purposes;

      (d) a change that, in the discretion of the General Partner, (i) does not
adversely affect the Limited Partners (including any particular class of
Partnership Interests as compared to other classes of Partnership Interests) in
any material respect, (ii) is necessary or advisable to (A) satisfy any
requirements, conditions or guidelines contained in any opinion, directive,
order, ruling or regulation of any federal or state agency or judicial authority
or contained in any federal or state statute (including the Delaware Act) or (B)
facilitate the trading of the Units (including the division of any class or
classes of Outstanding Units into different classes to facilitate uniformity of
tax consequences within such classes of Units) or comply with any rule,
regulation, guideline or requirement of any National Securities Exchange on
which the Units are or will be listed for trading, compliance with any of which
the General Partner determines in its discretion to be in the best interests of
the Partnership and the Limited Partners, (iii) is necessary or advisable in
connection with action taken by the General Partner pursuant to Section 5.12 or
(iv)

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is required to effect the intent expressed in the Registration Statement or the
intent of the provisions of this Agreement or is otherwise contemplated by this
Agreement;

      (e) a change in the fiscal year or taxable year of the Partnership and any
changes that, in the discretion of the General Partner, are necessary or
advisable as a result of a change in the fiscal year or taxable year of the
Partnership including, if the General Partner shall so determine, a change in
the definition of "Quarter" and the dates on which distributions are to be made
by the Partnership;

      (f) an amendment that is necessary, in the Opinion of Counsel, to prevent
the Partnership, or the General Partner or its directors, officers, trustees or
agents from in any manner being subjected to the provisions of the Investment
Company Act of 1940, as amended, the Investment Advisers Act of 1940, as
amended, or "plan asset" regulations adopted under the Employee Retirement
Income Security Act of 1974, as amended, regardless of whether such are
substantially similar to plan asset regulations currently applied or proposed by
the United States Department of Labor;

      (g) subject to the terms of Section 5.7, an amendment that, in the
discretion of the General Partner, is necessary or advisable in connection with
the authorization of issuance of any class or series of Partnership Securities
pursuant to Section 5.6;

      (h) any amendment expressly permitted in this Agreement to be made by the
General Partner acting alone;

      (i) an amendment effected, necessitated or contemplated by a Merger
Agreement approved in accordance with Section 14.3;

      (j) an amendment that, in the discretion of the General Partner, is
necessary or advisable to reflect, account for and deal with appropriately the
formation by the Partnership of, or investment by the Partnership in, any
corporation, partnership, joint venture, limited liability company or other
entity, in connection with the conduct by the Partnership of activities
permitted by the terms of Section 2.4;

      (k) a merger or conveyance pursuant to Section 14.3(d); or

      (l) any other amendments substantially similar to the foregoing.

Section 13.2 Amendment Procedures.

      Except as provided in Sections 13.1 and 13.3, all amendments to this
Agreement shall be made in accordance with the following requirements.
Amendments to this Agreement may be proposed only by or with the consent of the
General Partner which consent may be given or withheld in its sole discretion. A
proposed amendment shall be effective upon its approval by the holders of a Unit
Majority, unless a greater or different percentage is required under this
Agreement or by Delaware law. Each proposed amendment that requires the approval
of the holders of a specified percentage of Outstanding Units shall be set forth
in a writing that contains the text of the proposed amendment. If such an
amendment is proposed, the General Partner shall seek the written approval of
the requisite percentage of Outstanding Units or call a meeting of

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the Unitholders to consider and vote on such proposed amendment. The General
Partner shall notify all Record Holders upon final adoption of any such proposed
amendments.

Section 13.3 Amendment Requirements.

      (a) Notwithstanding the provisions of Sections 13.1 and 13.2, no provision
of this Agreement that establishes a percentage of Outstanding Units (including
Units deemed owned by the General Partner) required to take any action shall be
amended, altered, changed, repealed or rescinded in any respect that would have
the effect of reducing such voting percentage unless such amendment is approved
by the written consent or the affirmative vote of holders of Outstanding Units
whose aggregate Outstanding Units constitute not less than the voting
requirement sought to be reduced.

      (b) Notwithstanding the provisions of Sections 13.1 and 13.2, no amendment
to this Agreement may (i) enlarge the obligations of any Limited Partner without
its consent, unless such shall be deemed to have occurred as a result of an
amendment approved pursuant to Section 13.3(c), (ii) enlarge the obligations of,
restrict in any way any action by or rights of, or reduce in any way the amounts
distributable, reimbursable or otherwise payable to, the General Partner or any
of its Affiliates without its consent, which consent may be given or withheld in
its sole discretion, (iii) change Section 12.1(b), or (iv) change the term of
the Partnership or, except as set forth in Section 12.1(b), give any Person the
right to dissolve the Partnership.

      (c) Except as provided in Section 14.3, and without limitation of the
General Partner's authority to adopt amendments to this Agreement without the
approval of any Partners or Assignees as contemplated in Section 13.1, any
amendment that would have a material adverse effect on the rights or preferences
of any class of Partnership Interests in relation to other classes of
Partnership Interests must be approved by the holders of not less than a
majority of the Outstanding Partnership Interests of the class affected.

      (d) Notwithstanding any other provision of this Agreement, except for
amendments pursuant to Section 13.1 and except as otherwise provided by Section
14.3(b), no amendments shall become effective without the approval of the
holders of at least 90% of the Outstanding Units voting as a single class unless
the Partnership obtains an Opinion of Counsel to the effect that such amendment
will not affect the limited liability of any Limited Partner under applicable
law.

      (e) Except as provided in Section 13.1, this Section 13.3 shall only be
amended with the approval of the holders of at least 90% of the Outstanding
Units.

Section 13.4 Special Meetings.

      All acts of Limited Partners to be taken pursuant to this Agreement shall
be taken in the manner provided in this Article XIII. Special meetings of the
Limited Partners may be called by the General Partner or by Limited Partners
owning 20% or more of the Outstanding Units of the class or classes for which a
meeting is proposed. Limited Partners shall call a special meeting by delivering
to the General Partner one or more requests in writing stating that the signing
Limited Partners wish to call a special meeting and indicating the general or
specific purposes for which the special meeting is to be called. Within 60 days
after receipt of such a call from Limited

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Partners or within such greater time as may be reasonably necessary for the
Partnership to comply with any statutes, rules, regulations, listing agreements
or similar requirements governing the holding of a meeting or the solicitation
of proxies for use at such a meeting, the General Partner shall send a notice of
the meeting to the Limited Partners either directly or indirectly through the
Transfer Agent. A meeting shall be held at a time and place determined by the
General Partner on a date not less than 10 days nor more than 60 days after the
mailing of notice of the meeting. Limited Partners shall not vote on matters
that would cause the Limited Partners to be deemed to be taking part in the
management and control of the business and affairs of the Partnership so as to
jeopardize the Limited Partners' limited liability under the Delaware Act or the
law of any other state in which the Partnership is qualified to do business.

Section 13.5 Notice of a Meeting.

      Notice of a meeting called pursuant to Section 13.4 shall be given to the
Record Holders of the class or classes of Units for which a meeting is proposed
in writing by mail or other means of written communication in accordance with
Section 16.1. The notice shall be deemed to have been given at the time when
deposited in the mail or sent by other means of written communication.

Section 13.6 Record Date.

      For purposes of determining the Limited Partners entitled to notice of or
to vote at a meeting of the Limited Partners or to give approvals without a
meeting as provided in Section 13.11 the General Partner may set a Record Date,
which shall not be less than 10 nor more than 60 days before (a) the date of the
meeting (unless such requirement conflicts with any rule, regulation, guideline
or requirement of any National Securities Exchange on which the Units are listed
for trading, in which case the rule, regulation, guideline or requirement of
such exchange shall govern) or (b) in the event that approvals are sought
without a meeting, the date by which Limited Partners are requested in writing
by the General Partner to give such approvals.

Section 13.7 Adjournment.

      When a meeting is adjourned to another time or place, notice need not be
given of the adjourned meeting and a new Record Date need not be fixed, if the
time and place thereof are announced at the meeting at which the adjournment is
taken, unless such adjournment shall be for more than 45 days. At the adjourned
meeting, the Partnership may transact any business which might have been
transacted at the original meeting. If the adjournment is for more than 45 days
or if a new Record Date is fixed for the adjourned meeting, a notice of the
adjourned meeting shall be given in accordance with this Article XIII.

Section 13.8 Waiver of Notice; Approval of Meeting; Approval of Minutes.

      The transactions of any meeting of Limited Partners, however called and
noticed, and whenever held, shall be as valid as if it had occurred at a meeting
duly held after regular call and notice, if a quorum is present either in person
or by proxy, and if, either before or after the meeting, Limited Partners
representing such quorum who were present in person or by proxy and entitled to
vote, sign a written waiver of notice or an approval of the holding of the
meeting or an approval of the minutes thereof. All waivers and approvals shall
be filed with the Partnership

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records or made a part of the minutes of the meeting. Attendance of a Limited
Partner at a meeting shall constitute a waiver of notice of the meeting, except
when the Limited Partner does not approve, at the beginning of the meeting, of
the transaction of any business because the meeting is not lawfully called or
convened; and except that attendance at a meeting is not a waiver of any right
to disapprove the consideration of matters required to be included in the notice
of the meeting, but not so included, if the disapproval is expressly made at the
meeting.

Section 13.9 Quorum.

      The holders of a majority of the Outstanding Units of the class or classes
for which a meeting has been called (including Outstanding Units deemed owned by
the General Partner) represented in person or by proxy shall constitute a quorum
at a meeting of Limited Partners of such class or classes unless any such action
by the Limited Partners requires approval by holders of a greater percentage of
such Units, in which case the quorum shall be such greater percentage. At any
meeting of the Limited Partners duly called and held in accordance with this
Agreement at which a quorum is present, the act of Limited Partners holding
Outstanding Units that in the aggregate represent a majority of the Outstanding
Units entitled to vote and be present in person or by proxy at such meeting
shall be deemed to constitute the act of all Limited Partners, unless a greater
or different percentage is required with respect to such action under the
provisions of this Agreement, in which case the act of the Limited Partners
holding Outstanding Units that in the aggregate represent at least such greater
or different percentage shall be required. The Limited Partners present at a
duly called or held meeting at which a quorum is present may continue to
transact business until adjournment, notwithstanding the withdrawal of enough
Limited Partners to leave less than a quorum, if any action taken (other than
adjournment) is approved by the required percentage of Outstanding Units
specified in this Agreement (including Outstanding Units deemed owned by the
General Partner). In the absence of a quorum any meeting of Limited Partners may
be adjourned from time to time by the affirmative vote of holders of at least a
majority of the Outstanding Units entitled to vote at such meeting (including
Outstanding Units deemed owned by the General Partner) represented either in
person or by proxy, but no other business may be transacted, except as provided
in Section 13.7.

Section 13.10 Conduct of a Meeting.

      The General Partner shall have full power and authority concerning the
manner of conducting any meeting of the Limited Partners or solicitation of
approvals in writing, including the determination of Persons entitled to vote,
the existence of a quorum, the satisfaction of the requirements of Section 13.4,
the conduct of voting, the validity and effect of any proxies and the
determination of any controversies, votes or challenges arising in connection
with or during the meeting or voting. The General Partner shall designate a
Person to serve as chairman of any meeting and shall further designate a Person
to take the minutes of any meeting. All minutes shall be kept with the records
of the Partnership maintained by the General Partner. The General Partner may
make such other regulations consistent with applicable law and this Agreement as
it may deem advisable concerning the conduct of any meeting of the Limited
Partners or solicitation of approvals in writing, including regulations in
regard to the appointment of proxies, the appointment and duties of inspectors
of votes and approvals, the submission and examination of proxies and other
evidence of the right to vote, and the revocation of approvals in writing.

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Section 13.11 Action Without a Meeting.

      If authorized by the General Partner, any action that may be taken at a
meeting of the Limited Partners may be taken without a meeting if an approval in
writing setting forth the action so taken is signed by Limited Partners owning
not less than the minimum percentage of the Outstanding Units (including Units
deemed owned by the General Partner) that would be necessary to authorize or
take such action at a meeting at which all the Limited Partners were present and
voted (unless such provision conflicts with any rule, regulation, guideline or
requirement of any National Securities Exchange on which the Units are listed
for trading, in which case the rule, regulation, guideline or requirement of
such exchange shall govern). Prompt notice of the taking of action without a
meeting shall be given to the Limited Partners who have not approved in writing.
The General Partner may specify that any written ballot submitted to Limited
Partners for the purpose of taking any action without a meeting shall be
returned to the Partnership within the time period, which shall be not less than
20 days, specified by the General Partner. If a ballot returned to the
Partnership does not vote all of the Units held by the Limited Partners, the
Partnership shall be deemed to have failed to receive a ballot for the Units
that were not voted. If approval of the taking of any action by the Limited
Partners is solicited by any Person other than by or on behalf of the General
Partner, the written approvals shall have no force and effect unless and until
(a) they are deposited with the Partnership in care of the General Partner, (b)
approvals sufficient to take the action proposed are dated as of a date not more
than 90 days prior to the date sufficient approvals are deposited with the
Partnership and (c) an Opinion of Counsel is delivered to the General Partner to
the effect that the exercise of such right and the action proposed to be taken
with respect to any particular matter (i) will not cause the Limited Partners to
be deemed to be taking part in the management and control of the business and
affairs of the Partnership so as to jeopardize the Limited Partners' limited
liability, and (ii) is otherwise permissible under the state statutes then
governing the rights, duties and liabilities of the Partnership and the
Partners.

Section 13.12 Voting and Other Rights.

      (a) Only those Record Holders of the Units on the Record Date set pursuant
to Section 13.6 (and also subject to the limitations contained in the definition
of "Outstanding") shall be entitled to notice of, and to vote at, a meeting of
Limited Partners or to act with respect to matters as to which the holders of
the Outstanding Units have the right to vote or to act. All references in this
Agreement to votes of, or other acts that may be taken by, the Outstanding Units
shall be deemed to be references to the votes or acts of the Record Holders of
such Outstanding Units.

      (b) With respect to Units that are held for a Person's account by another
Person (such as a broker, dealer, bank, trust company or clearing corporation,
or an agent of any of the foregoing), in whose name such Units are registered,
such other Person shall, in exercising the voting rights in respect of such
Units on any matter, and unless the arrangement between such Persons provides
otherwise, vote such Units in favor of, and at the direction of, the Person who
is the beneficial owner, and the Partnership shall be entitled to assume it is
so acting without further inquiry. The provisions of this Section 13.12(b) (as
well as all other provisions of this Agreement) are subject to the provisions of
Section 4.3.

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                                  ARTICLE XIV

                                     MERGER

Section 14.1 Authority.

      The Partnership may merge or consolidate with one or more corporations,
limited liability companies, business trusts or associations, real estate
investment trusts, common law trusts or unincorporated businesses, including a
general partnership or limited partnership, formed under the laws of the State
of Delaware or any other state of the United States of America, pursuant to a
written agreement of merger or consolidation ("Merger Agreement") in accordance
with this Article XIV.

Section 14.2 Procedure for Merger or Consolidation.

      Merger or consolidation of the Partnership pursuant to this Article XIV
requires the prior approval of the General Partner. If the General Partner shall
determine, in the exercise of its discretion, to consent to the merger or
consolidation, the General Partner shall approve the Merger Agreement, which
shall set forth:

      (a) the names and jurisdictions of formation or organization of each of
the business entities proposing to merge or consolidate;

      (b) the name and jurisdiction of formation or organization of the business
entity that is to survive the proposed merger or consolidation (the "Surviving
Business Entity");

      (c) the terms and conditions of the proposed merger or consolidation;

      (d) the manner and basis of exchanging or converting the equity securities
of each constituent business entity for, or into, cash, property or general or
limited partner interests, rights, securities or obligations of the Surviving
Business Entity; and (i) if any general or limited partner interests, securities
or rights of any constituent business entity are not to be exchanged or
converted solely for, or into, cash, property or general or limited partner
interests, rights, securities or obligations of the Surviving Business Entity,
the cash, property or general or limited partner interests, rights, securities
or obligations of any limited partnership, corporation, trust or other entity
(other than the Surviving Business Entity) which the holders of such general or
limited partner interests, securities or rights are to receive in exchange for,
or upon conversion of their general or limited partner interests, securities or
rights, and (ii) in the case of securities represented by certificates, upon the
surrender of such certificates, which cash, property or general or limited
partner interests, rights, securities or obligations of the Surviving Business
Entity or any general or limited partnership, corporation, trust or other entity
(other than the Surviving Business Entity), or evidences thereof, are to be
delivered;

      (e) a statement of any changes in the constituent documents or the
adoption of new constituent documents (the articles or certificate of
incorporation, articles of trust, declaration of trust, certificate or agreement
of limited partnership or other similar charter or governing document) of the
Surviving Business Entity to be effected by such merger or consolidation;

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      (f) the effective time of the merger, which may be the date of the filing
of the certificate of merger pursuant to Section 14.4 or a later date specified
in or determinable in accordance with the Merger Agreement (provided, that if
the effective time of the merger is to be later than the date of the filing of
the certificate of merger, the effective time shall be fixed no later than the
time of the filing of the certificate of merger and stated therein); and

      (g) such other provisions with respect to the proposed merger or
consolidation as are deemed necessary or appropriate by the General Partner.

Section 14.3 Approval by Limited Partners of Merger or Consolidation.

      (a) Except as provided in Section 14.3(d), the General Partner, upon its
approval of the Merger Agreement, shall direct that the Merger Agreement be
submitted to a vote of Limited Partners, whether at a special meeting or by
written consent, in either case in accordance with the requirements of Article
XIII. A copy or a summary of the Merger Agreement shall be included in or
enclosed with the notice of a special meeting or the written consent.

      (b) Except as provided in Section 14.3(d), the Merger Agreement shall be
approved upon receiving the affirmative vote or consent of the holders of a Unit
Majority unless the Merger Agreement contains any provision that, if contained
in an amendment to this Agreement, the provisions of this Agreement or the
Delaware Act would require for its approval the vote or consent of a greater
percentage of the Outstanding Units or of any class of Limited Partners, in
which case such greater percentage vote or consent shall be required for
approval of the Merger Agreement.

      (c) Except as provided in Section 14.3(d), after such approval by vote or
consent of the Limited Partners, and at any time prior to the filing of the
certificate of merger pursuant to Section 14.4, the merger or consolidation may
be abandoned pursuant to provisions therefor, if any, set forth in the Merger
Agreement.

      (d) Notwithstanding anything else contained in this Article XIV or in this
Agreement, the General Partner is permitted, in its discretion, without Limited
Partner approval, to merge the Partnership or any Group Member into, or convey
all of the Partnership's assets to, another limited liability entity which shall
be newly formed and shall have no assets, liabilities or operations at the time
of such Merger other than those it receives from the Partnership or other Group
Member if (i) the General Partner has received an Opinion of Counsel that the
merger or conveyance, as the case may be, would not result in the loss of the
limited liability of any Limited Partner or any Group Member or cause the
Partnership or any Group Member to be treated as an association taxable as a
corporation or otherwise to be taxed as an entity for federal income tax
purposes (to the extent not previously treated as such), (ii) the sole purpose
of such merger or conveyance is to effect a mere change in the legal form of the
Partnership into another limited liability entity and (iii) the governing
instruments of the new entity provide the Limited Partners and the General
Partner with the same rights and obligations as are herein contained.

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<PAGE>

Section 14.4 Certificate of Merger.

      Upon the required approval by the General Partner and the Unitholders of a
Merger Agreement, a certificate of merger shall be executed and filed with the
Secretary of State of the State of Delaware in conformity with the requirements
of the Delaware Act.

Section 14.5 Effect of Merger.

      (a) At the effective time of the certificate of merger:

            (i) all of the rights, privileges and powers of each of the business
      entities that has merged or consolidated, and all property, real, personal
      and mixed, and all debts due to any of those business entities and all
      other things and causes of action belonging to each of those business
      entities, shall be vested in the Surviving Business Entity and after the
      merger or consolidation shall be the property of the Surviving Business
      Entity to the extent they were of each constituent business entity;

            (ii) the title to any real property vested by deed or otherwise in
      any of those constituent business entities shall not revert and is not in
      any way impaired because of the merger or consolidation;

            (iii) all rights of creditors and all liens on or security interests
      in property of any of those constituent business entities shall be
      preserved unimpaired; and

            (iv) all debts, liabilities and duties of those constituent business
      entities shall attach to the Surviving Business Entity and may be enforced
      against it to the same extent as if the debts, liabilities and duties had
      been incurred or contracted by it.

      (b) A merger or consolidation effected pursuant to this Article shall not
be deemed to result in a transfer or assignment of assets or liabilities from
one entity to another.

                                   ARTICLE XV

                   RIGHT TO ACQUIRE LIMITED PARTNER INTERESTS

Section 15.1 Right to Acquire Limited Partner Interests.

      (a) Notwithstanding any other provision of this Agreement, if at any time
more than 80% of the total Limited Partner Interests of any class then
Outstanding is held by the General Partner and its Affiliates, the General
Partner shall then have the right, which right it may assign and transfer in
whole or in part to the Partnership or any Affiliate of the General Partner,
exercisable in its sole discretion, to purchase all, but not less than all, of
such Limited Partner Interests of such class then Outstanding held by Persons
other than the General Partner and its Affiliates, at the greater of (x) the
Current Market Price as of the date three days prior to the date that the notice
described in Section 15.1(b) is mailed and (y) the highest price paid by the
General Partner or any of its Affiliates for any such Limited Partner Interest
of such class purchased during the 90-day period preceding the date that the
notice described in Section 15.1(b) is mailed. As used in this Agreement, (i)
"Current Market Price" as of any date of any

                                       93
<PAGE>

class of Limited Partner Interests means the average of the daily Closing Prices
(as hereinafter defined) per Limited Partner Interest of such class for the 20
consecutive Trading Days (as hereinafter defined) immediately prior to such
date; (ii) "Closing Price" for any day means the last sale price on such day,
regular way, or in case no such sale takes place on such day, the average of the
closing bid and asked prices on such day, regular way, in either case as
reported in the principal consolidated transaction reporting system with respect
to securities listed or admitted for trading on the principal National
Securities Exchange (other than the Nasdaq Stock Market) on which such Limited
Partner Interests of such class are listed or admitted to trading or, if such
Limited Partner Interests of such class are not listed or admitted to trading on
any National Securities Exchange (other than the Nasdaq Stock Market), the last
quoted price on such day or, if not so quoted, the average of the high bid and
low asked prices on such day in the over-the-counter market, as reported by the
Nasdaq Stock Market or such other system then in use, or, if on any such day
such Limited Partner Interests of such class are not quoted by any such
organization, the average of the closing bid and asked prices on such day as
furnished by a professional market maker making a market in such Limited Partner
Interests of such class selected by the General Partner, or if on any such day
no market maker is making a market in such Limited Partner Interests of such
class, the fair value of such Limited Partner Interests on such day as
determined reasonably and in good faith by the General Partner; and (iii)
"Trading Day" means a day on which the principal National Securities Exchange on
which such Limited Partner Interests of any class are listed or admitted to
trading is open for the transaction of business or, if Limited Partner Interests
of a class are not listed or admitted to trading on any National Securities
Exchange, a day on which banking institutions in New York City generally are
open.

      (b) If the General Partner, any Affiliate of the General Partner or the
Partnership elects to exercise the right to purchase Limited Partner Interests
granted pursuant to Section 15.1(a), the General Partner shall deliver to the
Transfer Agent notice of such election to purchase (the "Notice of Election to
Purchase") and shall cause the Transfer Agent to mail a copy of such Notice of
Election to Purchase to the Record Holders of Limited Partner Interests of such
class (as of a Record Date selected by the General Partner) at least 10, but not
more than 60, days prior to the Purchase Date. Such Notice of Election to
Purchase shall also be published for a period of at least three consecutive days
in at least two daily newspapers of general circulation printed in the English
language and published in the Borough of Manhattan, New York. The Notice of
Election to Purchase shall specify the Purchase Date and the price (determined
in accordance with Section 15.1(a)) at which Limited Partner Interests will be
purchased and state that the General Partner, its Affiliate or the Partnership,
as the case may be, elects to purchase such Limited Partner Interests, upon
surrender of Certificates representing such Limited Partner Interests in
exchange for payment, at such office or offices of the Transfer Agent as the
Transfer Agent may specify, or as may be required by any National Securities
Exchange on which such Limited Partner Interests are listed or admitted to
trading. Any such Notice of Election to Purchase mailed to a Record Holder of
Limited Partner Interests at his address as reflected in the records of the
Transfer Agent shall be conclusively presumed to have been given regardless of
whether the owner receives such notice. On or prior to the Purchase Date, the
General Partner, its Affiliate or the Partnership, as the case may be, shall
deposit with the Transfer Agent cash in an amount sufficient to pay the
aggregate purchase price of all of such Limited Partner Interests to be
purchased in accordance with this Section 15.1. If the Notice of Election to
Purchase shall have been duly given as aforesaid at least 10 days prior to the
Purchase Date, and if on or prior to

                                       94
<PAGE>

the Purchase Date the deposit described in the preceding sentence has been made
for the benefit of the holders of Limited Partner Interests subject to purchase
as provided herein, then from and after the Purchase Date, notwithstanding that
any Certificate shall not have been surrendered for purchase, all rights of the
holders of such Limited Partner Interests (including any rights pursuant to
Articles IV, V, VI, and XII) shall thereupon cease, except the right to receive
the purchase price (determined in accordance with Section 15.1(a)) for Limited
Partner Interests therefor, without interest, upon surrender to the Transfer
Agent of the Certificates representing such Limited Partner Interests, and such
Limited Partner Interests shall thereupon be deemed to be transferred to the
General Partner, its Affiliate or the Partnership, as the case may be, on the
record books of the Transfer Agent and the Partnership, and the General Partner
or any Affiliate of the General Partner, or the Partnership, as the case may be,
shall be deemed to be the owner of all such Limited Partner Interests from and
after the Purchase Date and shall have all rights as the owner of such Limited
Partner Interests (including all rights as owner of such Limited Partner
Interests pursuant to Articles IV, V, VI and XII).

      (c) At any time from and after the Purchase Date, a holder of an
Outstanding Limited Partner Interest subject to purchase as provided in this
Section 15.1 may surrender his Certificate evidencing such Limited Partner
Interest to the Transfer Agent in exchange for payment of the amount described
in Section 15.1(a), therefor, without interest thereon.

                                  ARTICLE XVI

                               GENERAL PROVISIONS

Section 16.1 Addresses and Notices.

      Any notice, demand, request, report or proxy materials required or
permitted to be given or made to a Partner or Assignee under this Agreement
shall be in writing and shall be deemed given or made when delivered in person
or when sent by first class United States mail or by other means of written
communication to the Partner or Assignee at the address described below. Any
notice, payment or report to be given or made to a Partner or Assignee hereunder
shall be deemed conclusively to have been given or made, and the obligation to
give such notice or report or to make such payment shall be deemed conclusively
to have been fully satisfied, upon sending of such notice, payment or report to
the Record Holder of such Partnership Securities at his address as shown on the
records of the Transfer Agent or as otherwise shown on the records of the
Partnership, regardless of any claim of any Person who may have an interest in
such Partnership Securities by reason of any assignment or otherwise. An
affidavit or certificate of making of any notice, payment or report in
accordance with the provisions of this Section 16.1 executed by the General
Partner, the Transfer Agent or the mailing organization shall be prima facie
evidence of the giving or making of such notice, payment or report. If any
notice, payment or report addressed to a Record Holder at the address of such
Record Holder appearing on the books and records of the Transfer Agent or the
Partnership is returned by the United States Postal Service marked to indicate
that the United States Postal Service is unable to deliver it, such notice,
payment or report and any subsequent notices, payments and reports shall be
deemed to have been duly given or made without further mailing (until such time
as such Record Holder or another Person notifies the Transfer Agent or the
Partnership of a change in his address) if they are available for the Partner or
Assignee at the principal office of the Partnership

                                       95
<PAGE>

for a period of one year from the date of the giving or making of such notice,
payment or report to the other Partners and Assignees. Any notice to the
Partnership shall be deemed given if received by the General Partner at the
principal office of the Partnership designated pursuant to Section 2.3. The
General Partner may rely and shall be protected in relying on any notice or
other document from a Partner, Assignee or other Person if believed by it to be
genuine.

Section 16.2 Further Action.

      The parties shall execute and deliver all documents, provide all
information and take or refrain from taking action as may be necessary or
appropriate to achieve the purposes of this Agreement.

Section 16.3 Binding Effect.

      This Agreement shall be binding upon and inure to the benefit of the
parties hereto and their heirs, executors, administrators, successors, legal
representatives and permitted assigns.

Section 16.4 Integration.

      This Agreement constitutes the entire agreement among the parties hereto
pertaining to the subject matter hereof and supersedes all prior agreements and
understandings pertaining thereto.

Section 16.5 Creditors.

      None of the provisions of this Agreement shall be for the benefit of, or
shall be enforceable by, any creditor of the Partnership.

Section 16.6 Waiver.

      No failure by any party to insist upon the strict performance of any
covenant, duty, agreement or condition of this Agreement or to exercise any
right or remedy consequent upon a breach thereof shall constitute waiver of any
such breach of any other covenant, duty, agreement or condition.

Section 16.7 Counterparts.

      This Agreement may be executed in counterparts, all of which together
shall constitute an agreement binding on all the parties hereto, notwithstanding
that all such parties are not signatories to the original or the same
counterpart. Each party shall become bound by this Agreement immediately upon
affixing its signature hereto or, in the case of a Person acquiring a Unit, upon
accepting the certificate evidencing such Unit or executing and delivering a
Transfer Application as herein described, independently of the signature of any
other party.

Section 16.8 Applicable Law.

      This Agreement shall be construed in accordance with and governed by the
laws of the State of Delaware, without regard to the principles of conflicts of
law.

                                       96
<PAGE>

Section 16.9 Invalidity of Provisions.

      If any provision of this Agreement is or becomes invalid, illegal or
unenforceable in any respect, the validity, legality and enforceability of the
remaining provisions contained herein shall not be affected thereby.

Section 16.10 Consent of Partners.

      Each Partner hereby expressly consents and agrees that, whenever in this
Agreement it is specified that an action may be taken upon the affirmative vote
or consent of less than all of the Partners, such action may be so taken upon
the concurrence of less than all of the Partners and each Partner shall be bound
by the results of such action.

               [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK.]

                                       97
<PAGE>

      IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date first written above.

                                GENERAL PARTNER:

                                CROSSTEX ENERGY GP, L.P.

                                By: Crosstex Energy GP, LLC,
                                    its general partner

                                By:______________________________________
                                    Name:  William W. Davis
                                    Title: Executive Vice President and
                                           Chief Financial Officer

                                       98
<PAGE>

                                LIMITED PARTNERS:

                                All Limited Partners now and hereafter
                                admitted as Limited Partners of the
                                Partnership, pursuant to powers of
                                attorney now and hereafter executed in
                                favor of, and granted and delivered to
                                the General Partner.

                                By:  Crosstex Energy GP, L.P.

                                     General Partner, as attorney-in-fact for
                                     the Limited Partners pursuant to the
                                     Powers of Attorney granted pursuant to
                                     Section 2.6.

                                     By:  Crosstex Energy GP, LLC, its
                                     General Partner

                                By:_________________________________________
                                   Name:    William W. Davis
                                   Title:   Executive Vice President and
                                            Chief Financial Officer

                                       99
<PAGE>

                                    EXHIBIT A
                       TO THE FOURTH AMENDED AND RESTATED
                       AGREEMENT OF LIMITED PARTNERSHIP OF
                              CROSSTEX ENERGY, L.P.
                       CERTIFICATE EVIDENCING COMMON UNITS
                    REPRESENTING LIMITED PARTNER INTERESTS IN
                              CROSSTEX ENERGY, L.P.

No. __________                                           __________ Common Units

      In accordance with Section 4.1 of the Fourth Amended and Restated
Agreement of Limited Partnership of Crosstex Energy, L.P., as amended,
supplemented or restated from time to time (the "Partnership Agreement"),
Crosstex Energy, L.P., a Delaware limited partnership (the "Partnership"),
hereby certifies that ___________________ (the "Holder") is the registered owner
of Common Units representing limited partner interests in the Partnership (the
"Common Units") transferable on the books of the Partnership, in person or by
duly authorized attorney, upon surrender of this Certificate properly endorsed
and accompanied by a properly executed application for transfer of the Common
Units represented by this Certificate. The rights, preferences and limitations
of the Common Units are set forth in, and this Certificate and the Common Units
represented hereby are issued and shall in all respects be subject to the terms
and provisions of, the Partnership Agreement. Copies of the Partnership
Agreement are on file at, and will be furnished without charge on delivery of
written request to the Partnership at, the principal office of the Partnership
located at 2501 Cedar Springs, Suite 100, Dallas, Texas 75201. Capitalized terms
used herein but not defined shall have the meanings given them in the
Partnership Agreement.

      The Holder, by accepting this Certificate, is deemed to have (i) requested
admission as, and agreed to become, a Limited Partner and to have agreed to
comply with and be bound by and to have executed the Partnership Agreement, (ii)
represented and warranted that the Holder has all right, power and authority
and, if an individual, the capacity necessary to enter into the Partnership
Agreement, (iii) granted the powers of attorney provided for in the Partnership
Agreement and (iv) made the waivers and given the consents and approvals
contained in the Partnership Agreement.

      This Certificate shall not be valid for any purpose unless it has been
countersigned and registered by the Transfer Agent and Registrar.

<PAGE>

Dated:_______________                    Crosstex Energy, L.P.

Countersigned and Registered by:         By:  Crosstex Energy GP, L.P.,
                                              its General Partner
                                              By:  Crosstex Energy GP, LLC, its
                                                   general partner

________________________________         By:____________________________________
as Transfer Agent and Registrar          Name:__________________________________

By:_____________________________         By:____________________________________
    Authorized Signature                        Secretary

<PAGE>

                            [REVERSE OF CERTIFICATE]

                                  ABBREVIATIONS

      The following abbreviations, when used in the inscription on the face of
this Certificate, shall be construed as follows according to applicable laws or
regulations:

TEN COM - as tenants in common               UNIF GIFT/TRANSFERS MIN ACT
TEN ENT - as tenants by the entireties       __________ Custodian _________
                                             (Cust)                  (Minor)

JT TEN -  as joint tenants with right of     under Uniform Gifts/Transfers to CD
          survivorship and not as            Minors Act (State)
          tenants in common

      Additional abbreviations, though not in the above list, may also be used.

                           ASSIGNMENT OF COMMON UNITS
                                       IN
                              CROSSTEX ENERGY, L.P.

      FOR VALUE RECEIVED, ____ hereby assigns, conveys, sells and transfers unto
_______________________________        _______________________________________
(Please print or typewrite name       (Please insert Social Security or other
and address of Assignee)              identifying number of Assignee)

__________ Common Units representing limited partner interests evidenced by this
Certificate, subject to the Partnership Agreement, and does hereby irrevocably
constitute and appoint __________ as its attorney-in-fact with full power of
substitution to transfer the same on the books of Crosstex Energy, L.P.

Date:_________                    NOTE:  The signature to any endorsement hereon
                                         must correspond with the name as
                                         written upon the face of this
                                         Certificate in every particular,
                                         without alteration, enlargement or
                                         change.

THE SIGNATURE(S) MUST BE
GUARANTEED BY AN ELIGIBLE                ______________________________
GUARANTOR INSTITUTION (BANKS,            (Signature)
STOCKBROKERS, SAVINGS AND LOAN
ASSOCIATIONS AND CREDIT UNIONS           ______________________________
WITH MEMBERSHIP IN AN APPROVED           (Signature)
SIGNATURE GUARANTEE MEDALLION
PROGRAM), PURSUANT TO S.E.C.
RULE 17d-15
________________________________

<PAGE>

      No transfer of the Common Units evidenced hereby will be registered on the
books of the Partnership, unless the Certificate evidencing the Common Units to
be transferred is surrendered for registration or transfer and an Application
for Transfer of Common Units has been executed by a transferee either (a) on the
form set forth below or (b) on a separate application that the Partnership will
furnish on request without charge. A transferor of the Common Units shall have
no duty to the transferee with respect to execution of the transfer application
in order for such transferee to obtain registration of the transfer of the
Common Units.

<PAGE>

                    APPLICATION FOR TRANSFER OF COMMON UNITS

      The undersigned ("Assignee") hereby applies for transfer to the name of
the Assignee of the Common Units evidenced hereby.

      The Assignee (a) requests admission as a Substituted Limited Partner and
agrees to comply with and be bound by, and hereby executes, the Amended and
Restated Agreement of Limited Partnership of Crosstex Energy, L.P. (the
"Partnership"), as amended, supplemented or restated to the date hereof (the
"Partnership Agreement"), (b) represents and warrants that the Assignee has all
right, power and authority and, if an individual, the capacity necessary to
enter into the Partnership Agreement, (c) appoints the General Partner of the
Partnership and, if a Liquidator shall be appointed, the Liquidator of the
Partnership as the Assignee's attorney-in-fact to execute, swear to, acknowledge
and file any document, including, without limitation, the Partnership Agreement
and any amendment thereto and the Certificate of Limited Partnership of the
Partnership and any amendment thereto, necessary or appropriate for the
Assignee's admission as a Substituted Limited Partner and as a party to the
Partnership Agreement, (d) gives the powers of attorney provided for in the
Partnership Agreement, and (e) makes the waivers and gives the consents and
approvals contained in the Partnership Agreement. Capitalized terms not defined
herein have the meanings assigned to such terms in the Partnership Agreement.

Date:____________

____________________________________________   _________________________________
Social Security or other identifying number          Signature of Assignee

____________________________________________   _________________________________
Purchase Price including commissions, if any      Name and Address of Assignee

Type of Entity (check one):

         [ ]   Individual            [ ]   Partnership        [ ]   Corporation

         [ ]   Trust                 [ ]   Other (specify)

Nationality (check one):

         [ ]   U.S. Citizen, Resident or Domestic Entity

         [ ]   Foreign Corporation   [ ]   Non-resident Alien

      If the U.S. Citizen, Resident or Domestic Entity box is checked, the
following certification must be completed.

      Under Section 1445(e) of the Internal Revenue Code of 1986, as amended
(the "Code"), the Partnership must withhold tax with respect to certain
transfers of property if a holder of an interest in the Partnership is a foreign
person. To inform the Partnership that no withholding is required with respect
to the undersigned interestholder's interest in it, the undersigned hereby
certifies the following (or, if applicable, certifies the following on behalf of
the interestholder).

<PAGE>

Complete Either A or B:

A.    Individual Interestholder

      1.    I am not a non-resident alien for purposes of U.S. income taxation.

      2.    My U.S. taxpayer identification number (Social Security Number) is
            __________.

      3.    My home address is .________________________________________________

B.    Partnership, Corporation or Other Interestholder

      1.    ________________ is not a foreign corporation, foreign partnership,
            foreign trust (Name of Interestholder) or foreign estate (as those
            terms are defined in the Code and Treasury Regulations).

      2.    The interestholder's U.S. employer identification number is
            ___________.

      3.    The interestholder's office address and place of incorporation (if
            applicable) is ___________.

      The interestholder agrees to notify the Partnership within sixty (60) days
of the date the interestholder becomes a foreign person.

      The interestholder understands that this certificate may be disclosed to
the Internal Revenue Service by the Partnership and that any false statement
contained herein could be punishable by fine, imprisonment or both.

      Under penalties of perjury, I declare that I have examined this
certification and to the best of my knowledge and belief it is true, correct and
complete and, if applicable, I further declare that I have authority to sign
this document on behalf of:

                        ________________________________
                             Name of Interestholder
                        ________________________________
                               Signature and Date
                        ________________________________
                              Title (if applicable)

      Note: If the Assignee is a broker, dealer, bank, trust company, clearing
corporation, other nominee holder or an agent of any of the foregoing, and is
holding for the account of any other person, this application should be
completed by an officer thereof or, in the case of a broker or dealer, by a
registered representative who is a member of a registered national securities
exchange or a member of the National Association of Securities Dealers, Inc.,
or, in the case of any other nominee holder, a person performing a similar
function. If the Assignee is a broker, dealer, bank, trust company, clearing
corporation, other nominee owner or an agent of any of the foregoing, the above
certification as to any person for whom the Assignee will hold the Common Units
shall be made to the best of the Assignee's knowledge.

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