Document:

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                                                                    EXHIBIT 10.1

                                                                  EXECUTION COPY

                            ASSET PURCHASE AGREEMENT

                                  BY AND AMONG

                         CHEMICON SPECIALTY MEDIA, INC.
                             A DELAWARE CORPORATION

                          CHEMICON INTERNATIONAL, INC.
                            A CALIFORNIA CORPORATION

                            SEROLOGICALS CORPORATION
                             A DELAWARE CORPORATION

                             SENTIGEN HOLDING CORP.
                             A DELAWARE CORPORATION

                                       AND

                       CELL & MOLECULAR TECHNOLOGIES, INC.
                             A DELAWARE CORPORATION

                             DATED FEBRUARY 22, 2005

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                                TABLE OF CONTENTS

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<S>                                                                                           <C>
ARTICLE I         CONSTRUCTION; DEFINITIONS..................................................   2

   Section 1.1    Definitions................................................................   2
   Section 1.2    Accounting Terms...........................................................   9

ARTICLE II        PURCHASE AND SALE..........................................................  10

   Section 2.1    Agreement to Purchase and Sell.............................................  10
   Section 2.2    Excluded Assets............................................................  11
   Section 2.3    Assumption of Assumed Liabilities..........................................  12
   Section 2.4    Excluded Liabilities.......................................................  12
   Section 2.5    Seller Deliveries..........................................................  14
   Section 2.6    Purchaser Deliveries.......................................................  14

ARTICLE III       PURCHASE PRICE; ADJUSTMENTS; ALLOCATIONS...................................  15

   Section 3.1    Purchase Price; Discharge of Mortgage......................................  15
   Section 3.2    Payment of Purchase Price..................................................  15
   Section 3.3    Adjustment of Purchase Price...............................................  16
   Section 3.4    Allocation of Certain Items................................................  17

ARTICLE IV         REPRESENTATIONS AND WARRANTIES OF SELLER AND PARENT.......................  18

   Section 4.1    Organization...............................................................  18
   Section 4.2    Authorization..............................................................  18
   Section 4.3    Absence of Restrictions and Conflicts......................................  19
   Section 4.4    Real Property..............................................................  19
   Section 4.5    Title to Assets; Related Matters...........................................  20
   Section 4.6    Inventory..................................................................  20
   Section 4.7    Financial Statements.......................................................  20
   Section 4.8    Legal Proceedings..........................................................  21
   Section 4.9    Contracts..................................................................  21
   Section 4.10   Officers, Employees and Independent Contractors............................  22
   Section 4.11   Labor Relations............................................................  23
   Section 4.12   Environmental, Health and Safety Matters...................................  24
   Section 4.13   Intellectual Property......................................................  25
   Section 4.14   Software...................................................................  27
   Section 4.15   Customer Relations.........................................................  27
   Section 4.16   Receivables................................................................  27
   Section 4.17   Licenses...................................................................  27
   Section 4.18   Product and Service Warranties.............................................  28
   Section 4.19   Brokers, Finders and Investment Bankers....................................  28
   Section 4.20   Conduct of Business by Seller..............................................  28
   Section 4.21   Termination of Malavarca Agreement.........................................  28
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<TABLE>
<S>                                                                                            <C>
ARTICLE V         REPRESENTATIONS AND WARRANTIES OF PURCHASER, SEROLOGICALS AND CHEMICON.....  28

   Section 5.1    Organization...............................................................  28
   Section 5.2    Authorization..............................................................  28
   Section 5.3    Defaults, Consents, Etc....................................................  29
   Section 5.4    Brokers, Finders and Investment Bankers....................................  29
   Section 5.5    Disclosure of Information..................................................  29

ARTICLE VI         CERTAIN COVENANTS AND AGREEMENTS..........................................  29

   Section 6.1    Public Announcements.......................................................  29
   Section 6.2    Employees..................................................................  30
   Section 6.3    Reserved...................................................................  31
   Section 6.4    Insurance..................................................................  31
   Section 6.5    Name Change................................................................  31
   Section 6.6    Non-Competition............................................................  31
   Section 6.7    Record Retention and Access................................................  32
   Section 6.8    Confidential Information...................................................  32

ARTICLE VII        INDEMNIFICATION...........................................................  32

   Section 7.1    Indemnification Obligations of Seller......................................  32
   Section 7.2    Indemnification Obligations of Purchaser...................................  33
   Section 7.3    Indemnification Procedure..................................................  34
   Section 7.4    Claims Period..............................................................  35
   Section 7.5    Liability Limits...........................................................  36
   Section 7.6    Investigations.............................................................  36

ARTICLE VIII       MISCELLANEOUS PROVISIONS..................................................  37

   Section 8.1    Notices....................................................................  37
   Section 8.2    Schedules and Exhibits.....................................................  37
   Section 8.3    Assignment; Successors in Interest.........................................  38
   Section 8.4    Captions...................................................................  38
   Section 8.5    Controlling Law; Amendment.................................................  38
   Section 8.6    Severability...............................................................  38
   Section 8.7    Counterparts...............................................................  38
   Section 8.8    Enforcement of Certain Rights..............................................  38
   Section 8.9    Waiver.....................................................................  38
   Section 8.10   Integration................................................................  38
   Section 8.11   Compliance with Bulk Sales Laws............................................  39
   Section 8.12   Further Assurances.........................................................  39
   Section 8.13   Transaction Costs..........................................................  39
   Section 8.14   Arbitration................................................................  39
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                                LIST OF EXHIBITS

<TABLE>
<S>                    <C>
Exhibit 2.5(a)         Bill of Sale
Exhibit 2.5(b)         Trademark Assignment Agreement
Exhibit 2.5(c)         Assignment and Assumption Agreement
Exhibit 2.5(d)         Termination Statements
Exhibit 2.5(e)         Escrow Agreement
Exhibit 4.4(b)         Phillipsburg Facility Mortgage
</TABLE>

                                LIST OF SCHEDULES

<TABLE>
<S>                    <C>
Schedule 1.1(t)        Financial Statements
Schedule 2.1(a)        Personal Property
Schedule 2.1(b)        Inventory
Schedule 2.1(c)        Seller Intellectual Property
Schedule 2.1(j)        Receivables
Schedule 2.1(k)        Licenses
Schedule 2.1(l)        Employment Agreements
Schedule 4.5(a)        Title Exceptions
Schedule 4.5(b)        List of Assets
Schedule 4.8           Legal Proceedings
Schedule 4.9           Assumed Contracts
Schedule 4.10          Officers and Employees
Schedule 4.11          Labor Relations
Schedule 4.12          Environmental, Health and Safety Matters
Schedule 4.13(e)       Works of Original Authorship
Schedule 4.13(g)       Employees Without Assignment Agreements
Schedule 4.13(j)       Exceptions to Confidential Information Protection
Schedule 4.14(a)       Seller Software
Schedule 4.15          Customers
Schedule 4.18          Warranties and Guaranties
</TABLE>

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                            ASSET PURCHASE AGREEMENT

      THIS ASSET PURCHASE AGREEMENT (this "Agreement"), dated as of February 22,
2005 (the "Closing Date"), is made and entered into by and among Chemicon
Specialty Media, Inc., a Delaware corporation ("Purchaser"), and a wholly owned
subsidiary of Chemicon International, Inc., a California corporation
("Chemicon"), Serologicals Corporation, a Delaware corporation ("Serologicals"),
Sentigen Holding Corp., a Delaware corporation ("Parent"), and Cell & Molecular
Technologies, Inc., a Delaware corporation ("Seller"). Purchaser, Chemicon,
Serologicals, Parent and Seller are sometimes individually referred to herein as
a "Party" and collectively as the "Parties".

                              W I T N E S S E T H:

      WHEREAS, Parent is a holding company that conducts business through two
wholly-owned operating subsidiaries, Seller and Sentigen Biosciences, Inc.
("Sentigen Biosciences");

      WHEREAS, Seller operates its business through its Specialty Media Division
(the "Division") and its Molecular Cell Science Division (the "MCS Division");

      WHEREAS, the Division's business consists of (i) development, manufacture
and marketing of high quality cell culture media, sera reagents and other
research products including (a) media, sera reagents for the culture of mouse
embryos, (b) Murine Embryonic Stem cells, Primary Mouse Embryo Fibroblast feeder
cells and reagents, (c) reagents for gene transfer and expression and (d)
standard and custom formulated cell culture media, cell cryopreservation media,
enzymatic and non-enzymatic cell dissociation solutions, (ii) the identification
and development of custom formulated research products and reagents and (iii)
the manufacture and distribution of the aforementioned products in the research
areas of (a) mouse embryo culture media, (b) general cell culture and (c) custom
media manufacturing (the "Business"); provided, that, the Business does not
include and shall not be deemed to include the MCS Business and the Sentigen
Biosciences Business;

      WHEREAS, the Parties desire to enter into this Agreement pursuant to which
Seller will sell to Purchaser, and Purchaser will purchase from Seller, all
assets comprising or used in the operation of the Business other than the
Phillipsburg Facility, and Purchaser will assume certain of Seller's liabilities
and obligations with respect to operation of the Business (the "Acquisition");

      WHEREAS, the Parties desire to make certain representations, warranties
and agreements in connection with the Acquisition; and

      WHEREAS, simultaneously with the execution of this Agreement, in
connection with the Acquisition, (i) Seller, Purchaser and Chemicon are entering
into a Transition Services Agreement (the "Transition Services Agreement"),
wherein Seller and Parent will agree to provide certain transition services
following the Closing Date to Purchaser on the terms set forth therein, and (ii)
Seller and Purchaser are entering into an Agreement of Sale, dated as of the
date of this Agreement, by and among Purchaser, Parent and Seller (the "Real
Estate Purchase

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Agreement"), wherein Seller will agree to sell to Purchaser, and Purchaser will
agree to buy from Seller, the Phillipsburg Facility subject to the terms and
conditions described therein.

      NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants, agreements and conditions hereinafter
set forth, and intending to be legally bound hereby, each Party hereby agrees as
follows:

                                    ARTICLE I
                            CONSTRUCTION; DEFINITIONS

      Section 1.1 Definitions. The following terms, as used herein, have the
following meanings:

            (a)   "ADA" means the United States Americans with Disabilities Act
      and the rules and regulations promulgated thereunder.

            (b)   "ADEA" means the United States Age Discrimination in
      Employment Act and the rules and regulations promulgated thereunder.

            (c)   "Affiliate" of any specified Person means any other Person
      directly or indirectly Controlling or Controlled by or under direct or
      indirect common Control with such specified Person.

            (d)   "Assumed Contracts" means those contracts, agreements,
      arrangements, and understandings listed on Schedule 4.9 and those
      contracts, agreements, arrangements, and understandings that relate to the
      operation of the Business and are not required to be listed on Schedule
      4.9 (but excluding any Employment Agreement, Employee Benefit Plan or
      insurance policy).

            (e)   "Business Day" means any day except Saturday, Sunday or any
      day on which banks are generally not open for business in the City of New
      York, New York or the City of Atlanta, Georgia.

            (f)   "CERCLA" means the United States Comprehensive Environmental
      Response, Compensation and Liability Act and the rules and regulations
      promulgated thereunder.

            (g)   "Claims Period" means the period during which a claim for
      indemnification may be asserted hereunder by an Indemnified Party.

            (h)   "Closing Date Working Capital" means the Net Working Capital
      as finally determined pursuant to Section 3.3.

            (i)   "Code" means the United States Internal Revenue Code of 1986,
      as amended.

            (j)   "Confidential Information" means any data or information of
      Seller or Parent (including trade secrets) related to the Division or the
      Business or both, that is not

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      generally known to the public or competitors regarding (for example and
      including, but not limited to) (a) business process models; (b)
      proprietary software; (c) research, development, products, services,
      marketing, selling, business plans, budgets, unpublished financial
      statements, licenses, prices, costs, contracts and other agreements,
      suppliers, customers, and customer lists; (d) the identity, skills and
      compensation of employees, contractors, and consultants; (e) specialized
      training; (f) discoveries, developments, trade secrets, processes,
      formulas, data, lists, and all other works of authorship, mask works,
      ideas, concepts, know-how, designs, and techniques, whether or not any of
      the foregoing is or are patentable, copyrightable, or registrable under
      any intellectual property Laws or industrial property Laws in the United
      States or elsewhere; and (g) such other information that may give the
      Division some competitive business advantage or the disclosure of which
      could be detrimental to the interests of the Division or the Business and
      that from all of the relevant circumstances could reasonably be assumed by
      any Person to be confidential and proprietary to Seller. Notwithstanding
      the foregoing, no data or information constitutes "Confidential
      Information" if such data or information is publicly known and in the
      public domain through means that do not involve a breach by Seller of any
      covenant or obligation set forth in this Agreement.

            (k) "Control" means, when used with respect to any specified Person,
      the power to direct the management and policies of such Person, directly
      or indirectly, whether through the ownership of voting securities, by
      contract or otherwise.

            (l) "Division Employee" means an employee of Seller who is engaged
      primarily in the Business. The Division Employees are listed on Schedule
      4.10.

            (m) "Employment Agreement" means any employment contract, consulting
      agreement, termination or severance agreement, salary continuation
      agreement, change of control agreement or any other agreement, including
      offers for any of the above, respecting the terms and conditions of
      employment or payment of compensation, or of a consulting or independent
      contractor relationship in respect to any current or former officer,
      employee, consultant or independent contractor.

            (n) "Employee Benefit Plan" means, with respect to any Person, each
      plan, fund, program, agreement, arrangement or scheme that is at any time
      sponsored or maintained or required to be sponsored or maintained by such
      Person or to which such Person makes or has made, or has or has had an
      obligation to make, contributions providing benefits to the employees,
      former employees, directors, managers, officers, consultants, independent
      contractors, contingent workers or leased employees of such Person or the
      dependents of any of them (whether written or oral), including (a) each
      deferred compensation, bonus, incentive compensation, pension, retirement,
      stock purchase, stock option and other equity compensation plan, (b) each
      "welfare" plan (within the meaning of Section 3(1) of ERISA, determined
      without regard to whether such plan is subject to ERISA), (c) each
      "pension" plan (within the meaning of Section 3(2) of ERISA, determined
      without regard to whether such plan is subject to ERISA), (d) each
      severance plan or agreement, and (e) each vacation, supplemental
      unemployment benefit, hospitalization insurance, fringe benefit, legal
      benefit and other employee benefit plan, fund, program, agreement or
      arrangement.

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            (o) "Environmental Conditions" means any pollution, contamination,
      degradation, damage or injury caused by, related to, arising from or in
      connection with the generation, handling, use, treatment, storage,
      transportation, disposal, discharge, Release or emission of any hazardous
      materials.

            (p) "Environmental Laws" means all applicable foreign, federal,
      state and local statutes or laws, common law, judgments, orders,
      regulations, licenses, permits, rules and ordinances relating to pollution
      or protection of health, safety or the environment, including, but not
      limited to the Federal Water Pollution Control Act (33 U.S.C. ss.1251 et
      seq.), Resource Conservation and Recovery Act (42 U.S.C. ss.6901 et seq.),
      Safe Drinking Water Act (42 U.S.C. ss.3000(f) et seq.), Toxic Substances
      Control Act (15 U.S.C. ss.2601 et seq.), Clean Air Act (42 U.S.C. ss.7401
      et seq.), Comprehensive Environmental Response, Compensation and Liability
      Act (42 U.S.C. ss.9601 et seq.) and other similar state and local
      statutes.

            (q) "ERISA" means the United States Employee Retirement Income
      Security Act of 1974 and the rules and regulations promulgated thereunder.

            (r) "ERISA Affiliate" means any Person (whether incorporated or
      unincorporated) that together with Seller would be deemed a "single
      employer" within the meaning of Section 414 of the Code.

            (s) "ERISA Affiliate Plan" means each Employee Benefit Plan
      sponsored or maintained or required to be sponsored or maintained at any
      time by any ERISA Affiliate, or to which such ERISA Affiliate makes or has
      made, or has or has had an obligation to make, contributions at any time.

            (t) "Financial Statements" means (i) the schedule of balance sheet
      information for the Division and (ii) the pro forma statements of
      operation of the Division, as of and for the nine months ended September
      30, 2004, copies of which are attached hereto as Schedule 1.1(t).

            (u) "FLSA" means the United States Fair Labor Standards Act and the
      rules and regulations promulgated thereunder.

            (v) "FMLA" means the United States Family and Medical Leave Act and
      the rules and regulations promulgated thereunder.

            (w) "GAAP" means generally accepted accounting principles as applied
      in the United States.

            (x) "Governmental Entity" means any federal, state or local or
      foreign government, any political subdivision thereof or any court,
      administrative or regulatory agency, department, instrumentality, body or
      commission or other governmental authority or agency, domestic or foreign.

            (y) "Hazardous Materials" means any pollutant, chemical or substance
      and any toxic, infectious, carcinogenic, reactive, corrosive, ignitable or
      flammable chemical,

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      or chemical compound, or hazardous substance, material or waste, whether
      solid, liquid or gas, that is subject to regulation, control or
      remediation under any Environmental Laws, including without limitation,
      any quantity of friable asbestos, urea formaldehyde, polychlorinated
      biphenyls, radon gas, crude oil or any fraction thereof, all forms of
      natural gas, petroleum products or by-products or derivatives.

            (z) "Indemnified Party" means a Purchaser Indemnified Party or a
      Seller Indemnified Party.

            (aa) "Intellectual Property" means any or all of the following and
      all rights, arising out of or associated therewith: (i) all inventions
      (whether patentable or not), invention disclosures, improvements, trade
      secrets, proprietary and confidential information, process,
      specifications, compositions, manufacturing methods, operational data,
      application methods, testing methods, computer programs, blueprints,
      drawings, designs, information and documents relating to research and
      development, know-how, technology, technical data and customer lists, and
      all documentation relating to any of the foregoing throughout the world;
      (ii) all copyrights, copyright registrations and applications therefor,
      and all other rights corresponding thereto throughout the world; (iii) all
      industrial designs and any registrations and applications therefor
      throughout the world; (iv) all websites, internet uniform resource
      locators, domain names, trade names, logos, slogans, designs common law
      trademarks and service marks, service mark registrations and applications
      therefor throughout the world; (v) all databases and data collections and
      all rights therein throughout the world; (vi) all moral and economic
      rights of authors and inventors, however denominated, throughout the
      world; and (vii) any similar or equivalent rights to any of the foregoing
      anywhere in the world.

            (bb) "Knowledge" with respect to Seller means (i) all facts known by
      Fred Rolff, Richard Malavarca and Thomas J. Livelli on the Closing Date
      following reasonable inquiry and diligence with respect to the matters at
      hand, and (ii) the actual knowledge of Joseph K. Pagano on the Closing
      Date.

            (cc) "Labor Laws" means all Laws governing or concerning labor
      relations, unions and collective bargaining, conditions of employment,
      employment discrimination and harassment, wages, hours or occupational
      safety and health, including, without limitation, ERISA, the United States
      Immigration Reform and Control Act of 1986, the United States National
      Labor Relations Act, the United States Civil Rights Acts of 1866 and 1964,
      the United States Equal Pay Act, ADEA, ADA, FMLA, WARN, OSHA, the United
      States Davis Bacon Act, the United States Walsh-Healy Act, the United
      States Service Contract Act, United States Executive Order 11246, FLSA and
      the United States Rehabilitation Act of 1973 and all rules and regulations
      promulgated under such acts.

            (dd) "Laws" means all statutes, rules, codes, regulations,
      restrictions, ordinances, orders, decrees, approvals, directives,
      judgments, injunctions, writs, awards and decrees of, or issued by, all
      Governmental Entities.

            (ee) "Licenses" means all notifications, licenses, permits
      (including environmental, construction and operation permits), franchises,
      certificates, approvals,

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      exemptions, classifications, registrations and other similar documents and
      authorizations issued by any Governmental Entity, and applications
      therefor.

            (ff) "Liens" mean all mortgages, liens, pledges, security interests,
      charges, claims, restrictions and encumbrances of any nature whatsoever,
      and any lease having the same effect.

            (gg) "Malavarca Agreement" means that certain Employment Agreement,
      dated as of May 23, 2001, by and between Seller and Richard Malavarca.

            (hh) "Material Adverse Effect" means any state of facts, change,
      event, effect or occurrence (when taken together with all other states of
      fact, changes, events, effects or occurrences) that has had or is
      reasonably likely to have a materially adverse effect on the financial
      condition, results of operations, prospects, properties, assets or
      liabilities (including contingent liabilities) of the Business or the
      Assets taken as a whole. A Material Adverse Effect shall also include any
      state of facts, change, event or occurrence that shall have occurred or
      been threatened that (when taken together with all other states of facts,
      changes, events, effects or occurrences that have occurred or been
      threatened) has prevented or materially delayed, or would be reasonably
      likely to prevent or materially delay, the performance by Seller of its
      obligations hereunder or the consummation of the transactions contemplated
      hereby.

            (ii) "MCS Business" means the business of providing contract
      research and development services to the life sciences community in the
      areas of (1) molecular biology, (2) cell biology, (3) gene expression, (4)
      protein expression, purification and biochemistry, (5) bio-processing, (6)
      drug discovery support services, (7) high-throughput screening support
      services, (8) cell culture scale-up and the provision of whole cells, cell
      derived proteins and sub-cellular fractions, (9) gene transfer, (10)
      generation of recombinant cell lines with or without division arrest
      technology, and (11) mouse genetics, including gene cloning, gene
      targeting in mouse embryonic stem cells, generation of knock-out and/or
      knock-in and conditional expression mouse models and the creation of
      related cell lines.

            (jj) "Net Working Capital" means the excess of the current assets
      included in the Assets over the current liabilities included in the
      Assumed Liabilities, or the excess of the current liabilities included in
      the Assumed Liabilities over the current assets included in the Assets, as
      the case may be, each as of the close of business on the Closing Date and
      determined in accordance with GAAP.

            (kk) "NLRB" means the United States National Labor Relations Board.

            (ll) "Noncompete Period" means the period beginning on the Closing
      Date and continuing for a period of five (5) years from the Closing Date.

            (mm) "OSHA" means the United States Occupational Safety and Health
      Act.

            (nn) "Owned Real Property" means the parcel of real property on
      which the Phillipsburg Facility is located together with all fixtures and
      improvements thereon.

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            (oo) "Permitted Exceptions" shall have the meaning set forth in the
      Real Estate Purchase Agreement.

            (pp) "Person" means any individual, corporation, partnership, joint
      venture, limited liability company, trust, unincorporated organization or
      Governmental Entity.

            (qq) "Phillipsburg Facility" means the offices and manufacturing
      operations housed in the 6,600 square foot facility located at 580
      Marshall Street, Phillipsburg, NJ 08865, housing the office and
      manufacturing facilities of the Division.

            (rr) "Purchaser Ancillary Documents" means any certificate,
      agreement, document or other instrument, other than this Agreement, to be
      executed and delivered by Purchaser in connection with the transactions
      contemplated hereby, including without limitation, the Real Estate
      Purchase Agreement.

            (ss) "Purchaser Indemnified Parties" means Purchaser and its
      Affiliates, their respective officers, directors, employees, agents and
      representatives and the heirs, executors, successors and assigns of any of
      the foregoing.

            (tt) "Receivables" means all of the accounts receivable or other
      receivables arising from or related to the operation of the Business.

            (uu) "Registered Intellectual Property" means all United States,
      international and foreign: (i) registered trademarks and service marks,
      applications to register trademarks and service marks, intent-to-use
      applications, or other registrations or applications related to trademarks
      and service marks; (ii) registered copyrights and applications for
      copyright registration; (iii) domain name registrations; and (iv) any
      other Intellectual Property that is the subject of an application,
      certificate, filing, registration or other document issued, filed with, or
      recorded with any federal, state, local or foreign Governmental Entity or
      other public body.

            (vv) "Release" means, with respect to any Hazardous Material, any
      spilling, leaking, pumping, pouring, emitting, emptying, discharging,
      injecting, escaping, leaching, dumping or disposing into any surface or
      ground water, drinking water supply, soil, surface or subsurface strata or
      medium, or the ambient air.

            (ww) "Seller Ancillary Documents" means any certificate, agreement,
      document or other instrument, other than this Agreement, to be executed
      and delivered by Seller or an Affiliate thereof in connection with the
      transactions contemplated hereby, including without limitation, the Real
      Estate Purchase Agreement.

            (xx) "Seller Benefit Plan" means each Employee Benefit Plan
      sponsored or maintained or required to be sponsored or maintained at any
      time by Seller or Parent or to which Seller or Parent makes or has made,
      or has or has had an obligation to make, contributions at any time.

            (yy) "Seller Indemnified Parties" means Seller and its respective
      officers, directors, employees, agents and representatives and the heirs,
      executors, successors and

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      assigns of any of the foregoing.

            (zz) "Seller Intellectual Property" means the Intellectual Property
      that is primarily used in the operation of the Business. For purposes of
      clarification, Seller Intellectual Property does not include Intellectual
      Property that is primarily used in the MCS Business or the Sentigen
      Biosciences Business, notwithstanding the incidental use of such
      Intellectual Property in the Business.

            (aaa) "Seller Registered Intellectual Property" means the Registered
      Intellectual Property primarily used in the operation of the Business,
      including, without limitation, Seller Software, Seller Registered
      Intellectual Property, the U.S. Trademark on "Embryomax" and the
      "Specialty Media" trade name and related trademark.

            (bbb) "Seller Software" means the Software primarily used in the
      operation of the Business.

            (ccc) "Sentigen Biosciences Business" means the development and
      commercialization of novel bioassay systems, including the Tango Assay
      System and related intellectual property, that elucidate the underlying
      biology of protein-protein interactions with the initial target of its
      Tango Assay System being the functionalization of G protein-coupled
      receptors for pharmaceutical drug discovery and development, and the
      accompanying services of providing related cell lines and reagents.

            (ddd) "Software" means any computer software program, together with
      any error corrections, updates, modifications, or enhancements thereto, in
      both machine-readable form and human-readable form, including all comments
      and any procedural code.

            (eee) "Target Working Capital" means the amount of $422,557.

            (fff) "Taxes" means all taxes, assessments, charges, duties, fees,
      levies and other governmental charges, including income, franchise,
      capital stock, real property, personal property, tangible, withholding,
      employment, payroll, social security, social contribution, unemployment
      compensation, disability, transfer, sales, use, excise, gross receipts,
      value-added and all other taxes of any kind imposed by any Governmental
      Entity, whether disputed or not, and any charges, interest or penalties
      imposed by any Governmental Entity.

            (ggg) "Tax Return" means any report, return, declaration or other
      information required to be supplied to a Governmental Entity in connection
      with Taxes, including estimated returns and reports of every kind with
      respect to Taxes.

            (hhh) "WARN" means the United States Worker Adjustment and
      Retraining Notification Act and the rules and regulations promulgated
      thereunder.

            (iii) "Working Capital Deficit" means the excess, if any, of the
      Target Working Capital over the Closing Date Working Capital.

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<PAGE>

            (jjj) "Working Capital Surplus" means the excess, if any, of the
      Closing Date Working Capital over the Target Working Capital.

      Section 1.2 Accounting Terms.All accounting terms not specifically defined
herein shall be construed in accordance with GAAP.

      Section 1.3 Cross References. Each of the following terms is defined in
the Section set forth opposite such term:

<TABLE>
<CAPTION>
Term                                                                     Section
----                                                                     -------
<S>                                                                      <C>
Accounting Referee.....................................................     3.3(c)
Acquisition ...........................................................   Recitals
Agreement..............................................................   Preamble
Assets.................................................................        2.1
Assignment and Assumption Agreement....................................     2.5(c)
Assumed Liabilities....................................................     2.3(b)
Basket.................................................................        7.5
Bill of Sale...........................................................     2.5(a)
Business                                                                  Recitals
Business Licenses......................................................       4.17
Chemicon                                                                  Preamble
Closing Date...........................................................   Preamble
Closing Date Indebtedness..............................................     2.4(e)
Division                                                                  Recitals
Escrow Amount..........................................................  3.2(a)(i)
Excluded Assets........................................................        2.2
Excluded Liabilities...................................................        2.4
Indemnifying Party.....................................................     7.3(a)
Inventory..............................................................     2.1(c)
Joint Confidentiality Agreement........................................     6.6(a)
MCS      ..............................................................   Recitals
Parent   ..............................................................   Preamble
Parties  ..............................................................   Preamble
Party    ..............................................................   Preamble
Preliminary Working Capital............................................     3.3(a)
Purchase Price.........................................................        3.1
Purchaser..............................................................   Preamble
Purchaser Losses.......................................................        7.1
Purchaser Surviving Obligations........................................     7.4(b)
Purchaser Surviving Representations....................................     7.4(b)
Purchaser Working Capital..............................................     3.3(b)
Real Estate Purchase Agreement.........................................   Recitals
Seller.................................................................   Preamble
Seller Losses..........................................................        7.2
Seller Surviving Obligations...........................................     7.4(a)
Seller Surviving Representations.......................................     7.4(a)
</TABLE>

                                      -9-
<PAGE>

<TABLE>
<S>                                                                       <C>
Sentigen Biosciences...................................................   Recitals
Serologicals...........................................................   Preamble
Third Party Claim......................................................     7.3(a)
Trademark Assignment Agreement.........................................     2.5(b)
Transferred Employees..................................................     6.2(a)
Transition Services Agreement..........................................   Recitals
</TABLE>

                                   ARTICLE II
                                PURCHASE AND SALE

      Section 2.1 Agreement to Purchase and Sell. Subject to the terms and
conditions hereof, and except as otherwise specifically provided in this Article
II, Seller and Parent, in consideration for the payment of the Purchase Price in
accordance with Section 3.2, do hereby, simultaneously with the execution and
delivery of this Agreement, grant, sell, assign, transfer and deliver to
Purchaser, and Purchaser hereby, simultaneously with the execution and delivery
of this Agreement, purchases and acquires from Seller and Parent, all right,
title and interest of Seller and Parent in and to all of the assets, properties
and rights of Seller and Parent with respect to the Business of every kind and
description, real, personal and mixed, tangible and intangible, wherever
situated, used by the Division or in the operation of the Business, including
without limitation:

            (a)   all machinery, equipment, furniture and other tangible and
      intangible personal property used in the operation of the Business,
      including, without limitation, the machinery, equipment, furniture and
      other tangible personal property described on Schedule 2.1(a) hereto;

            (b)   all inventories of raw materials, work in process, or finished
      goods for use in the operation of the Business (the "Inventory"),
      including without limitation the Inventory listed on Schedule 2.1(b), less
      any of the Inventory sold in the ordinary course of business after the
      date of such Schedule;

            (c)   all Seller Intellectual Property and Seller Registered
      Intellectual Property, including without limitation the Seller
      Intellectual Property listed on Schedule 2.1(c);

            (d)   all Assumed Contracts, including without limitation the
      Assumed Contracts listed on Schedule 4.9;

            (e)   all books, records and files relating to the operation of the
      Business, including but not limited to all production, sales and warranty
      records related to the Division or the Business;

            (f)   all prepaid expenses of the Business other than prepaid
      insurance premiums;

            (g)   all unfilled customer orders of the Business;

                                      -10-
<PAGE>

            (h) all rights under any franchises, licenses and permits relating
      to the operation of the Business;

            (i) all rights to causes of action, lawsuits, judgments, claims and
      demands of any nature available to, or being pursued by, Seller relating
      to the operation of the Business, whether arising by way of counterclaim
      or otherwise;

            (j) the Receivables, including without limitation, the Receivables
      listed on Schedule 2.1(j), less any of such Receivables collected in the
      ordinary course of business after the date of such Schedule;

            (k) all Licenses, including without limitation, the Licenses listed
      on Schedule 2.1(k);

            (l) any and all rights and interests granted to the Parent, Seller
      or the Division pursuant to any Employment Agreement in any Seller
      Intellectual Property, any Seller Registered Intellectual Property or any
      non-compete, non-solicitation or similar provision in favor of the Seller,
      Parent or Division, including, without limitation, pursuant to the
      Employment Agreements set forth on Schedule 2.1(l); and

            (m) all of Seller's rights, title and interest in the warranties and
      guaranties affecting the Owned Real Property or parts thereof assigned by
      Seller pursuant to Section 4(a)(iv) of the Real Estate Purchase Agreement;

      all free and clear of Liens (collectively referred to herein as the
      "Assets").

    Section 2.2 Excluded Assets. Notwithstanding anything to the contrary set
forth herein, the Assets shall not include the following assets, properties and
rights of Seller or Parent (collectively, the "Excluded Assets"):

            (a) any cash or cash equivalents;

            (b) all ownership and other rights with respect to the Malavarca
      Agreement, and any Employment Agreement, and any liabilities relating to
      the termination by Seller of the Malavarca Agreement, pursuant to Section
      4.21;

            (c) any License or similar right that by its terms is not
      transferable to Purchaser, including those indicated on Schedule 2.1(k) as
      not being transferable;

            (d) the charter documents of Seller, minute books, stock ledgers,
      Tax Returns, books of account and other constituent records relating to
      the corporate organization of Seller;

            (e) all accounting records relating to the Division that were
      created on or before the Closing Date;

                                      -11-
<PAGE>

            (f)   all personnel and other records created by Seller's or
      Parent's Human Resources Department that relate to the Division and that
      were created on or before the Closing Date;

            (g)   all master files and data files related to the Division
      created on the Seller's or Parent's information technology system on or
      before the Closing Date;

            (h)   any Intellectual Property other than the Seller Intellectual
      Property, the Seller Registered Intellectual Property, and the rights
      described in Section 2.1(l); and

            (i)   the Owned Real Property.

      Section 2.3 Assumption of Assumed Liabilities.

            (a)   Except for the Assumed Liabilities, Purchaser shall not
      assume, in connection with the transactions contemplated hereby, any
      liability or obligation with respect to the Assets, the Division or the
      Business whatsoever, and Seller or Parent, as the case may be, shall be
      responsible for and shall discharge and timely pay all liabilities and
      obligations, whether or not accrued and whether or not disclosed.

            (b)   Purchaser shall assume the following liabilities and
      obligations with respect to the Assets, the Division and the Business
      (collectively, the "Assumed Liabilities"):

                  (i) the accounts payable of the Division incurred in the
            operation of the Business to the extent but only to the extent such
            accounts payable arose in the ordinary course of business,
            consistent with past practice and, in accordance with their terms,
            are not past due on the Closing Date; and

                  (ii) the obligations under the Assumed Contracts to the extent
            and only to the extent such obligations are not required to be
            performed prior to the Closing Date, are disclosed on the face of
            such Assumed Contracts and accrue and relate to the operations of
            the Business subsequent to the Closing Date.

            (c)   Without limiting Parent's and Seller's indemnification
      obligations set forth in Section 7, Purchaser shall assume all liabilities
      and obligations with respect to any event, circumstance, or action with
      respect to the Owned Real Property that first occurred subsequent to the
      Closing Date.

    Section 2.4   Excluded Liabilities. Specifically, and without in any way
limiting the generality of Section 2.3(a), the Assumed Liabilities shall not
include, and in no event shall Purchaser assume, agree to pay, or be obligated
to discharge or satisfy any liability or obligation hereunder or otherwise have
any responsibility for any of the following liabilities or obligations (together
with all other liabilities that are not Assumed Liabilities, the "Excluded
Liabilities"):

            (a)   any liabilities under warranties or otherwise relating to
      products of the Division or the Business;

                                      -12-
<PAGE>

            (b) any liabilities incurred in connection with or arising out of or
      resulting from (A) any provision of any Environmental Law and arising out
      of, or relating to, (x) any condition of, or the existence of any
      Hazardous Material on or with respect to, any acquired Asset or the Owned
      Real Property on or prior to the Closing Date, (y) any act or omission of
      Seller or its employees, agents or representatives or any prior owner or
      operator of the Phillipsburg Facility or (z) the ownership, use, control
      or operation by any Person on or prior to the Closing Date of the Owned
      Real Property or any of the Assets, including arising from any Release of
      any Hazardous Material or off-site shipment of any Hazardous Material at
      or from any real property, plant, facility, site, area or property by any
      Person or (B) mold or any other environmental matter or condition with
      respect to the Owned Real Property or any of the Assets;

            (c) any liability or obligations of Seller or Parent in respect of
      any Taxes including, without limitation, any Taxes arising from or
      relating to the ownership and operation of the Assets, the Owned Real
      Property or the Assumed Liabilities on or prior to the Closing Date;

            (d) any liability related to any Lien on the Assets;

            (e) any liability of Seller or the Business for, or relating to,
      liability for principal, interest, premium and fees or expenses with
      respect to money borrowed or capital lease obligations to the extent the
      same is secured by a mortgage, lien or other similar encumbrance on the
      Assets (the "Closing Date Indebtedness");

            (f) any liability relating to the conduct of the Division prior to
      the Closing Date arising out of (i) claims made in pending or future
      suits, actions, investigations, or other legal, governmental or
      administrative proceedings or (ii) claims based on violations of Law,
      breach of contract, employment practices, violations of Labor Laws or
      environmental, health and safety matters or any other actual or alleged
      failure to perform any obligation;

            (g) any liability pertaining to Excluded Assets, and any asset other
      than the Assets;

            (h) any liability relating to, resulting from or arising out of any
      discontinued operations or operations that have been disposed of prior to
      the Closing Date;

            (i) any liability of Seller or Parent or the Business arising or
      incurred in connection with the negotiation, preparation and execution of
      this Agreement and the transactions contemplated hereby and thereby and
      any fees and expenses of counsel, accountants, brokers, financial advisors
      or other experts of Seller, Parent or the Division; or

            (j) any liabilities or obligations under or relating to any Seller
      Benefit Plan, ERISA Affiliate Plan or Employment Agreement, including but
      not limited to any obligation or liability to make any payment or payments
      to any Person, including any Governmental Entity, as a result of the
      Acquisition or otherwise under the Malavarca Agreement.

                                      -13-
<PAGE>

      Section 2.5 Seller Deliveries. Simultaneously with the execution of this
Agreement, Seller is delivering to Purchaser the following:

            (a)   executed bills of sale, instruments of assignment,
      certificates of title and other conveyance documents, dated as of the
      Closing Date, transferring to Purchaser all of Seller's right, title and
      interest in and to the Assets, together with possession of the Assets,
      including the Bill of Sale (the "Bill of Sale") attached hereto as Exhibit
      2.5(a);

            (b)   executed trademark assignment agreement, transferring to
      Purchaser all of Seller's right, title and interest in and to the
      Embryomax trademark and the Specialty Media trade name and related
      trademark (the "Trademark Assignment Agreement") attached hereto as
      Exhibit 2.5(b);

            (c)   documents evidencing the assignment of the Assumed Contracts
      and the assignment of any assignable Licenses, including the Assignment
      and Assumption Agreement (the "Assignment and Assumption Agreement")
      attached hereto as Exhibit 2.5(c);

            (d)   Uniform Commercial Code termination statements attached hereto
      as Exhibit 2.5(d), terminating the security interests with respect to the
      Assets evidenced by the Uniform Commercial Code financing statements
      described therein;

            (e)   the Escrow Agreement, attached hereto as Exhibit 2.5(e); and

            (f)   all other documents required to be entered into by Seller
      pursuant hereto or reasonably requested by Purchaser to convey the Assets
      to Purchaser or to otherwise consummate the transactions contemplated
      hereby.

      Section 2.6   Purchaser Deliveries. Simultaneously with the execution of
this Agreement, Purchaser is delivering to Seller the following:

            (a)   the portion of the Purchase Price to be paid on the Closing
      Date pursuant to Section 3.2(a)(ii), paid and delivered in accordance with
      such Section;

            (b)   documents evidencing the assumption of the Assumed Contracts
      and the acceptance of the assignable Licenses and the Assumed Liabilities,
      including the Assignment and Assumption Agreement;

            (c)   the Escrow Agreement; and

            (d)   all other documents required to be entered into or delivered
      by Purchaser at or prior to the Closing Date pursuant hereto or reasonably
      requested by Seller to convey the Assets to Purchaser or to otherwise
      consummate the transactions contemplated hereby.

                                      -14-
<PAGE>

                                   ARTICLE III
                    PURCHASE PRICE; ADJUSTMENTS; ALLOCATIONS

      Section 3.1  Purchase Price; Discharge of Mortgage.

            (a) Subject to adjustment pursuant to Section 3.3 and to the
      indemnification obligations under Section 7.1, the aggregate amount to be
      paid for the Assets (the "Purchase Price") shall be Six Million
      Ninety-Five Thousand Dollars ($6,095,000). In addition to the foregoing
      payment, as consideration for the grant, sale, assignment, transfer and
      delivery of the Assets, Purchaser shall assume and discharge the Assumed
      Liabilities.

            (b) Concurrent with the execution and delivery of this Agreement,
      Purchaser is paying to PNC Bank Two Hundred Forty-Five Thousand Forty-Two
      Dollars and Eighty-Nine Cents ($245,042.89) in full satisfaction of, the
      discharge of Loan No. 880237994, which is secured by a mortgage lien on
      the Owned Real Property.

      Section 3.2 Payment of Purchase Price.

            (a) Simultaneously with the execution and delivery of this Agreement
      in full satisfaction of the payment of the Purchase Price, Purchaser is:

                  (i) depositing in escrow with the escrow agent identified in
            the Escrow Agreement, Five Hundred Thousand Dollars ($500,000) (the
            "Escrow Amount"), which amount shall be held and disbursed in
            accordance with the terms of the Escrow Agreement;

                  (ii) paying to the Escrow Agent (identified in the Escrow
            Agreement) the amount of Three Thousand Dollars ($3,000),
            representing the Escrow Agent's fee; and

                  (iii) paying to Seller Five Million Five Hundred Ninety-One
            Thousand Seven Hundred Sixty-Six Dollars and Seventy-Three Cents
            ($5,591,766.73), the receipt and sufficiency of which the Seller
            does hereby acknowledge.

            (b) Within five Business Days following the determination of the
      Closing Date Working Capital in accordance with Section 3.3:

                  (i) If there is a Working Capital Deficit, then Seller shall
            pay to Purchaser an amount equal to the Working Capital Deficit.

                  (ii) If there is a Working Capital Surplus, then Purchaser
            shall pay to Seller an amount equal to the Working Capital Surplus.

                  (iii) If a dispute exists between Seller and Purchaser
            regarding the amount of Working Capital Deficit or the Working
            Capital Surplus, as the case may be, the Party owing payment shall
            pay to the other Party the uncontested amount prior to the
            determination of the disputed amount in accordance with Section
            3.3(c).

                                      -15-
<PAGE>

            (c) All payments being made under this Section 3.2 or any other
      provision hereof are being or shall be made in cash by wire transfer of
      immediately available funds to such bank account as shall be designated in
      writing by the party to which the applicable payment is due at least three
      Business Days prior to the applicable payment date.

      Section 3.3 Adjustment of Purchase Price.

            (a) Preliminary Working Capital. As promptly as practicable
      following the Closing Date (but in any event within 90 days), Seller shall
      prepare and deliver to Purchaser a schedule setting forth Seller's
      determination of the Net Working Capital (the "Preliminary Working
      Capital"). The Preliminary Working Capital shall set forth by line item
      the components of Net Working Capital and shall be accompanied by such
      detail and supporting schedules as may be necessary, or may be reasonably
      requested by Purchaser to verify Seller's calculations.

            (b) Objections. Purchaser shall have 30 days following receipt of
      the Preliminary Working Capital during which to notify Seller of any
      dispute of any item contained in the Preliminary Working Capital, which
      notice shall set forth in reasonable detail the basis for such dispute and
      Purchaser's calculations of Net Working Capital (the "Purchaser Working
      Capital"). In the event Purchaser does not notify Seller of any such
      dispute within such 30-day period, the Preliminary Working Capital shall
      be deemed to be the Closing Date Working Capital. Purchaser and Seller
      shall cooperate in good faith to resolve any such dispute as promptly as
      possible, and upon such resolution, the Closing Date Working Capital shall
      be prepared in accordance with the agreement of Purchaser and Seller.

            (c) Accounting Referee. If Seller and Purchaser are unable to reach
      a final resolution of all disputes regarding the Closing Date Working
      Capital within 45 days after the delivery by Purchaser of a notice of
      disagreement to Seller, Seller and Purchaser will jointly retain an
      accounting firm of recognized national standing (the "Accounting Referee")
      to resolve any remaining disagreements. If Seller and Purchaser are unable
      to agree on the choice of the Accounting Referee, then the Accounting
      Referee will be chosen by lot by Seller and Purchaser from between
      PricewaterhouseCoopers LLP and Ernst & Young LLP, in each case using a
      partner of the New York, New York or Atlanta, Georgia office of such
      firms. Seller and Purchaser will direct the Accounting Referee to render a
      determination and to send notice of such determination to Seller and
      Purchaser pursuant to the provisions of Section 3.3(b) within 60 days of
      its retention and Seller and Purchaser, and their respective agents, will
      cooperate with the Accounting Referee during its engagement. The
      Accounting Referee will consider only those line items and amounts in the
      Preliminary Working Capital that are objected to by the Purchaser in
      Purchaser's objection notice (referred to in Section 3.3(b)) that Seller
      and Purchaser are unable to resolve. Seller and Purchaser shall each
      submit a binder to the Accounting Referee promptly (and in any event
      within 20 days after the Accounting Referee's engagement), which binder
      shall contain such Party's computation of those line items or amounts
      contained in the Preliminary Working Capital about which the parties could
      not resolve any differences and such Party's calculation of Closing Date
      Working Capital. The

                                      -16-
<PAGE>

      Accounting Referee shall review such binders and base its determination
      solely on them; provided, that if a Party fails to submit such a binder,
      the Accounting Referee shall proceed to determine the Closing Date Working
      Capital without such binder. In resolving all disputed line items and
      amounts, the Accounting Referee's determination of Closing Date Working
      Capital may not exceed the amount of Purchaser's Working Capital set forth
      on the objection notice and may not be less than the amount of Preliminary
      Working Capital. The Accounting Referee's determination will be based on
      the definition of Closing Date Working Capital set forth in this
      Agreement. The determination of the Accounting Referee of the Closing Date
      Working Capital will be conclusive and binding upon the parties for all
      purposes pursuant to this Agreement.

            (d)   Expenses. The Purchaser shall bear a percentage of the costs
      and expenses of the Accounting Referee equal to the difference between the
      aggregate amount contested by the Purchaser set forth on the objection
      notice and amounts actually paid to the Purchaser with respect to
      contested items, as a percentage of the aggregate amount so contested.

            (e)   Access and Cooperation. Seller and Purchaser agree that they
      will, and agree to cause their respective independent accountants to,
      cooperate and assist in the preparation and the calculation of Closing
      Date Working Capital and in the conduct of the reviews and procedures
      referred to in this Section 3.3, including the making available, to the
      extent necessary, of books, records, work papers and personnel.

      Section 3.4 Allocation of Certain Items. With respect to certain expenses
incurred with respect to the Assets in the operation of the Business, the
following allocations are being made between Seller on the one hand and
Purchaser on the other:

            (a)   Taxes. Real and ad valorem property taxes are being
      apportioned based upon the amounts set forth in the current tax bills
      therefor and the number of days in the taxable period prior to (and
      including) the Closing Date and in the taxable period following the
      Closing Date.

            (b)   Utilities. Utilities, water and sewer charges are being
      apportioned based upon the number of Business Days occurring prior to (and
      including) the Closing Date and following the Closing Date during the
      billing period for each such charge.

            (c)   Workers' Compensation. Seller shall be responsible for and
      shall pay any and all workers' compensation and other claims asserted by,
      or with respect to, any employee or former employee of Seller, in respect
      of any injury or other compensable event or occupational illness or
      disease that occurred or is attributable to any event, state of facts or
      condition that existed or occurred in whole prior to the Closing Date.
      Purchaser is responsible for and shall pay any and all workers'
      compensation and other similar claims asserted by, or with respect to, any
      employee hired by Purchaser in respect of any injury or other compensable
      event or occupational illness or disease that occurred or is attributable
      to any event, state of facts or condition that existed or occurred in
      whole on or after the Closing Date. In the event any injury or other
      compensable event or occupational illness or disease of an individual who
      was employed both by Seller prior to

                                      -17-
<PAGE>

      the Closing Date and by Purchaser on or following the Closing Date is
      attributable in part to causes occurring prior to the Closing Date and in
      part to causes occurring on or after the Closing Date and is the basis of
      a workers' compensation or other similar claim asserted following the
      Closing Date, then liability for any such claim shall be equitably
      apportioned between Seller and Purchaser based on the number of days
      falling before the Closing Date, on the one hand, and on or after the
      Closing Date, on the other hand, during which such compensable event or
      occupational illness or disease existed or was suffered.

      Appropriate cash payments by Purchaser or Seller to the other, as the case
may require, shall be made hereunder from time to time as soon as practicable
after the facts giving rise to the obligation for such payments are known in the
amounts necessary to give effect to the allocations provided for in this Section
3.4; provided, however, that such payments shall not be required to the extent
an accrued expense or prepaid expense is adequately reflected with respect to
such item on the Closing Date Working Capital.

                                   ARTICLE IV
               REPRESENTATIONS AND WARRANTIES OF Seller AND PARENT

      Seller and Parent hereby jointly and severally represent and warrant to
Purchaser as follows as of the date hereof:

      Section 4.1 Organization. Each of Parent and Seller is a corporation duly
formed and validly existing under the Laws of the State of Delaware and has all
requisite power and authority to own, lease and operate its properties and to
carry on the operation of the Business as now being conducted.

      Section 4.2 Authorization. Each of Parent and Seller has full power and
authority to execute and deliver this Agreement and the Seller Ancillary
Documents and to perform its obligations hereunder and thereunder and to
consummate the transactions contemplated hereby and thereby. The execution and
delivery of this Agreement and the Seller Ancillary Documents by Parent and
Seller and the performance by each of Parent and Seller of its obligations
hereunder and thereunder and the consummation of the transactions provided for
herein and therein have been duly and validly authorized by all necessary
corporate action on the part of Parent and Seller. Each of Parent's and Seller's
board of directors has approved the execution, delivery and performance of this
Agreement and the Seller Ancillary Documents and the consummation of the
transactions contemplated hereby and thereby. This Agreement and the Seller
Ancillary Documents have been duly executed and delivered by each of Parent and
Seller and, assuming due authorization, execution and delivery by the other
parties to this Agreement, this Agreement and the Seller Ancillary Documents
constitute the valid and binding agreements of Parent and Seller, enforceable
against both Parent and Seller in accordance with their respective terms,
subject to applicable bankruptcy, insolvency and other similar Laws affecting
the enforceability of creditors' rights generally, general equitable principles
and the discretion of courts in granting equitable remedies, including, without
limitation, the possible unavailability of specific performance or injunctive
relief, regardless of whether considered in a proceeding in equity or law.

                                      -18-
<PAGE>

      Section 4.3  Absence of Restrictions and Conflicts. The execution,
delivery and performance of this Agreement and Seller Ancillary Documents, the
consummation of the transactions contemplated hereby and thereby and the
fulfillment of and compliance with the terms and conditions hereof and thereof
do not or shall not (as the case may be), with the passing of time or the giving
of notice or both, violate or conflict with, constitute a breach of or default
under, result in the loss of any benefit under, permit the acceleration of any
obligation under or create in any party the right to terminate, modify or
cancel, (a) any term or provision of Seller's or Parent's certificate of
incorporation or bylaws, (b) except as set forth on Schedule 4.9, any Assumed
Contract or any other contract to which Seller or Parent is a party, (c) any
judgment, decree or order of any Governmental Entity to which either Parent or
Seller is a party or by which either Seller or any of their respective
properties are bound (including without limitation the Assets and the Owned Real
Property) or (d) any Law, arbitration award applicable to the Business which
Seller, the Assets or the Owned Real Property is subject. No consent, approval,
order or authorization of, or registration, declaration or filing with, any
Governmental Entity is required with respect to either Parent or Seller in
connection with the execution, delivery or performance of this Agreement or
Seller Ancillary Documents or the consummation of the transactions contemplated
hereby or thereby.

      Section 4.4  Real Property.

            (a)    There are no proceedings at law or in equity before
      Governmental Entity pending or, to Seller's Knowledge, threatened, against
      or affecting the Owned Real Property or the Seller's title thereto.

            (b)    No portion of the Owned Real Property, or any building or
      improvement located thereon, violates any Law (excluding any Environmental
      Laws) including, without limitation, Laws relating to zoning, building,
      land use, health and safety, fire, air, sanitation and noise control.
      Except for the Permitted Exceptions and the existing mortgage on the
      Phillipsburg Facility attached as Exhibit 4.4(b), no Owned Real Property
      is subject to (i) Liens, (ii) any governmental decree or order (or, to the
      Knowledge of Seller, threatened or proposed order) or (iii) any rights of
      way, building use restrictions, exceptions, variances, reservations or
      limitations of any nature whatsoever.

            (c)    The improvements and fixtures on the Owned Real Property are
      in good operating condition and in a state of good maintenance and repair,
      ordinary wear and tear excepted, and are adequate and suitable for the
      purposes for which they are presently being used. The Owned Real Property
      constitutes all of the real property utilized by Seller in the operation
      of the Business.

            (d)    There is no condemnation, expropriation or similar proceeding
      pending or, to the Knowledge of Seller, threatened against any of the
      Owned Real Property or any portion or improvement thereon.

            (e)    There are no contracts in effect with respect to the
      maintenance and operation of the Owned Real Property which would be
      binding on Purchaser or otherwise cancelable without penalty on not more
      than one month's notice.

                                      -19-
<PAGE>

            (f) There are no leases affecting the Owned Real Property.

            (g) As of the Closing Date, Seller is not a party to any agreement
      (written or oral) granting any rights of possession to any third party,
      and Seller has not executed any agreement of sale, option agreement, right
      of first refusal or lease with respect to the Owned Real Property.

            (h) All sums payable by reason of any labor or materials heretofore
      furnished with respect to the Owned Real Property have been, or in the
      ordinary course of business will be, paid, and Seller does not have
      Knowledge of any material dispute in connection therewith.

            (i) Seller is not a "foreign person" under the Foreign Investment in
      Real Property Tax Act of 1980, and upon consummation of the transactions
      contemplated hereby, Purchaser will not be required to withhold any
      withholding tax from any payment made under the Real Estate Purchase
      Agreement.

            (j) Seller has not received any written notice from any insurance
      company or inspection or rating bureau setting forth any requirements as a
      condition to the continuation of any insurance coverage or with respect to
      the Premises or the continuation thereof at premium rates existing at
      present.

            (k) Seller has not made an assignment for the benefit of creditors,
      nor has Seller filed, or had filed against it, any petition for
      bankruptcy.

      Section 4.5 Title to Assets; Related Matters. The Assets constitute all of
the assets necessary and sufficient to conduct the operations of the Business in
accordance with Seller's past practices. Except as set forth on Schedule 4.5(a),
Seller is conveying to Purchaser good and marketable title to the Assets, free
and clear of all Liens. All equipment and other items of tangible personal
property and assets included in the Assets (a) are in good operating condition,
in a state of good maintenance and repair, ordinary wear and tear excepted, (b)
are usable in the regular and ordinary course of business and (c) conform to all
applicable Laws. Except as set forth on Schedule 4.5(a), no Person other than
Seller owns any equipment or other tangible personal property or assets situated
on the Owned Real Property. Schedule 4.5(b) sets forth a true, correct and
complete list and general description of each item of tangible personal property
included in the Assets having a book value of more than $5,000.

      Section 4.6 Inventory. The Inventory (a) was acquired and is sufficient
for the operation of the Business in the ordinary course consistent with past
practice, (b) consists of items that are good and merchantable within normal
trade tolerances, (c) is of a quality and quantity presently usable or saleable
in the ordinary course of business of the Business, (d) is valued on the books
and records of Seller at the lower of cost or market with the cost determined
under the first-in-first-out inventory valuation method consistent with past
practice and (e) is subject to reserves determined in accordance with GAAP
consistently applied.

      Section 4.7 Financial Statements. Seller has delivered to Purchaser the
Financial Statements. The Financial Statements have been prepared from, and are
in accordance with, the books and records of Seller, related to the operation of
the Business, which books and records are

                                      -20-
<PAGE>

maintained in accordance with GAAP consistently applied throughout the periods
indicated, and such books and records have been maintained on a basis consistent
with the past practice of Seller. Each schedule of balance sheet accounts
included in the Financial Statements fairly presents the assets and liabilities
of the Division included therein as of the date of such schedule, and each pro
forma statement of operations included in the Financial Statements fairly
presents the results of operations of the Division for the periods set forth
therein, in each case in accordance with GAAP consistently applied during the
periods involved (except for the absence of footnotes). Since September 30,
2004, there has been no material change in any accounting (or tax accounting)
policy, practice or procedure of Seller with respect to the Business or the
Division.

      Section 4.8 Legal Proceedings. Except as set forth on Schedule 4.8, there
is no suit, action, claim, arbitration, proceeding or investigation pending or,
to the Knowledge of Seller or Parent, threatened against Seller or Parent,
related to or affecting the transactions contemplated by this Agreement, the
Business, the Assets or the Assumed Liabilities before any Governmental Entity.

      Section 4.9 Contracts. Schedule 4.9 sets forth a true, correct and
complete list of the following contracts currently in force, or under which
Seller has continuing liabilities and/or obligations, used by the Division or in
the operation of the Business:

            (a)   all bonds, debentures, notes, loans, credit or loan agreements
      or loan commitments, mortgages, indentures, guarantees or other contracts
      relating to the borrowing of money or binding upon any properties or
      assets (real, personal or mixed, tangible or intangible);

            (b)   all contracts and agreements that limit or restrict Seller or
      any officers or key employees of Seller from engaging in any business in
      any jurisdiction;

            (c)   all contracts and agreements for capital expenditures or the
      acquisition or construction of fixed assets requiring the payment by
      Seller of an amount in excess of $10,000;

            (d)   all contracts and agreements granting any Person a Lien on all
      or any part of any Assets;

            (e)   all contracts and agreements for the cleanup, abatement or
      other actions in connection with any Hazardous Materials, the remediation
      of any existing environmental condition or relating to the performance of
      any environmental audit or study;

            (f)   all contracts and agreements granting to any Person an option
      or a first refusal, first-offer or similar preferential right to purchase
      or acquire any Assets;

            (g) all contracts and agreements with any agent, distributor or
      representative that is not terminable without penalty on 30 days' or less
      notice;

                                      -21-
<PAGE>

            (h)  all contracts and agreements for the granting or receiving of a
      license, sublicense or franchise or under which any Person is obligated to
      pay or has the right to receive a royalty, license fee, franchise fee or
      similar payment;

            (i)  all contracts, Licenses and agreements to which Seller is a
      party (i) pursuant to which any Seller Intellectual Property is licensed
      or transferred to any third party (other than end user Licenses in the
      ordinary course of business) or (ii) pursuant to which a third party has
      licensed or transferred any Seller Intellectual Property to Seller;

            (j)  all contracts providing for the indemnification or holding
      harmless of any officer, director, employee or other Person;

            (k)  all joint venture or partnership contracts and all other
      contracts providing for the sharing of any profits;

            (l)  all contracts with customers for the provision of goods or
      services by the Division or the Business;

            (m)  all outstanding powers of attorney empowering any Person to act
      on behalf of Seller with respect to the affairs of the Division or the
      Business;

            (n)  all contracts relating to any co-operative organization or
      franchise organization; and

            (o)  all existing contracts and commitments (other than those
      described in subsections (a) through (n) of this Section 4.9) to which
      Seller is a party or by which its properties or assets are bound (i)
      involving an annual commitment or annual payment to or from Seller of more
      than $10,000 individually or (ii) that is material to the Business,
      individually or in the aggregate.

True, correct and complete copies of all Assumed Contracts have been made
available to Purchaser. The Assumed Contracts are legal, valid, binding and
enforceable in accordance with their respective terms with respect to Seller and
to the Knowledge of Seller, each other party to such Assumed Contracts. There is
no existing default or breach of Seller or, to the Knowledge of Seller, any
other party under any Assumed Contract (or event or condition that, with notice
or lapse of time or both could constitute a default or breach). Except in the
ordinary course of business, Seller is not participating in any discussions or
negotiations regarding modification of or amendment to any Assumed Contract or
entry in any new material contract applicable to the Business, the Assets or the
Assumed Liabilities. Schedule 4.9 identifies with an asterisk each Assumed
Contract set forth therein that requires the consent of or notice to the other
party thereto to avoid any breach, default or violation of such contract,
agreement or other instrument in connection with the transactions contemplated
hereby, including the assignment of such Assumed Contract to Purchaser. Seller
has obtained all such consents or notices, which are as of the Closing Date in
full force and effect, and has provided to Purchaser true, correct and complete
copies of all such consents and notices.

    Section 4.10 Officers, Employees and Independent Contractors. Schedule
4.10 contains a true and complete list of (a) all of the Division Employees,
specifying their name,

                                      -22-
<PAGE>

title, date of hire, length of employment, current annual salary rate and all
other compensation and fringe benefits, and accrued salary, benefits and
vacation time, exempt/non-exempt status under the FLSA, and (b) all independent
contractors used by the Division or the Business, specifying the name of the
independent contractor, type of labor, fees paid to such independent contractor
for calendar year 2004, and (c) the name of any officer, other employee or
independent contractor who is subject to any Employment Agreement. Except as set
forth on Schedule 4.10, Seller is not a party to or bound by any Employment
Agreement related to the Business. Seller has provided to Purchaser true,
correct and complete copies of each such Employment Agreement.

      Section 4.11 Labor Relations. Except as set forth on Schedule 4.11 with
respect to the operation of the Business:

            (a)    none of Seller's employees, since becoming employees of
      Seller, have been, and none are, represented by a labor organization or
      group that was either certified or voluntarily recognized by any labor
      relations board (including the NLRB) or certified or voluntarily
      recognized by any other Governmental Entity;

            (b)    no representation election petition or application for
      certification has been filed by employees of Seller or is pending with the
      NLRB or any other Governmental Entity and no union organizing campaign or
      other attempt to organize or establish a labor union, employee
      organization or labor organization or group involving employees of Seller
      has occurred, is in progress or, to the Knowledge of Seller, is
      threatened;

            (c)    no labor dispute, walk out, strike, slowdown, hand billing,
      picketing, work stoppage (sympathetic or otherwise), or other "concerted
      action" involving the employees of Seller has occurred, is in progress or,
      to the Knowledge of Seller, has been threatened;

            (d)    no citation has been issued under OSHA against Seller and no
      notice of contest, claim, complaint, charge, investigation, or other
      administrative enforcement proceeding involving Seller has been filed or
      is pending or, to the Knowledge of Seller, threatened against Seller under
      OSHA or any other applicable Labor Law relating to occupational safety and
      health at the Phillipsburg Facility or related to the employees of the
      Business;

            (e)    Seller has not taken any action that could constitute a "mass
      layoff", "mass termination" or "plant closing" within the meaning of WARN
      or otherwise trigger notice requirements or liability under any federal,
      local, state or foreign plant closing notice or collective dismissal Law;

            (f)    no wrongful discharge, discrimination, harassment,
      retaliation, libel, slander or other claim, complaint, charge or
      investigation that arises out of the employment relationship between
      Seller and any of its employees has been filed or is pending or, to the
      Knowledge of Seller, threatened against Seller under any applicable Labor
      Law; and

                                      -23-
<PAGE>

            (g)  Seller is in compliance with all applicable Labor Laws as they
      relate to the Business, except to the extent that such non-compliance
      would not have a Material Adverse Effect.

      Section 4.12 Environmental, Health and Safety Matters. Except as set forth
on Schedule 4.12 with respect to the Assets and the operation of the Business:

            (a)  Except as would not have a Material Adverse Effect, Seller
      possesses all permits and approvals required under, and is in compliance
      with, all Environmental Laws, and Seller is in compliance with all
      applicable limitations, restrictions, conditions, standards, prohibitions,
      requirements, obligations, schedules and timetables contained in all
      Environmental Laws or contained in any other Law, or any notice or demand
      letter issued thereunder;

            (b)  Seller has not received written notice of actual or threatened
      liability under CERCLA or any similar foreign, state or local Law from any
      Governmental Entity or any third party and, to Seller's Knowledge, there
      is no fact or circumstance that could form the basis for the assertion of
      any claim against Seller under any Environmental Law, including CERCLA or
      any similar local, state or foreign Law with respect to any on-site or
      off-site location;

            (c)  Seller has not entered into or agreed to enter into, and Seller
      has no present intent to enter into, any consent decree or order, and
      Seller is not subject to any judgment, decree or judicial or
      administrative order relating to compliance with, or the cleanup of
      Hazardous Materials under, any applicable Environmental Law;

            (d)  To Seller's Knowledge, Seller is not subject to any claim,
      obligation, liability, loss, damage or expense incurred or imposed or
      based upon any provision of any Environmental Law or arising out of any
      act or omission of any employee, agent or representative of the Business
      or arising out of the ownership, use, control or operation by Seller of
      any of the Assets or the Owned Real Property from which any Hazardous
      Material was Released;

            (e)  Seller has provided Purchaser access to review true, correct
      and complete copies of all reports, correspondence, memoranda, computer
      data and similar information in Seller's possession relating to
      environmental matters relating to the Assets or the Owned Real Property;

            (f)  No improvement or equipment included in the Assets or the Owned
      Real Property contains any asbestos, polychlorinated biphenyls,
      underground storage tanks, open or closed pits, landfills, sumps or other
      containers on or under any Asset or the Owned Real Property other than in
      compliance with all Environmental Laws;

            (g)  Seller has not been alleged by any Governmental Entity to be in
      violation of, and has not been subject to any administrative or judicial
      proceeding pursuant to, or paid any fines or penalties pursuant to,
      applicable Environmental Laws at any time during the past five (5) years;
      and

                                      -24-
<PAGE>

            (h) Seller has not imported, manufactured, stored, used, operated,
      transported, treated or disposed of any Hazardous Material other than in
      compliance with all Environmental Laws.

      Section 4.13 Intellectual Property.

            (a)  Seller owns exclusively and has good title to all Seller
      Intellectual Property and Seller Registered Intellectual Property free and
      clear of all Liens.

            (b)  Schedule 2.1(c) contains a list of all Seller Registered
      Intellectual Property. Seller has made available to Purchaser correct and
      complete copies of all documents evidencing Seller Intellectual Property.

            (c)  No Seller Intellectual Property or product or service of the
      Business related to Seller Intellectual Property is subject to any
      proceeding or outstanding decree, order, judgment, agreement or
      stipulation. Each item of Seller Registered Intellectual Property is valid
      and subsisting. All necessary registration, maintenance and renewal fees
      currently due in connection with Seller Registered Intellectual Property
      have been made and all necessary documents, recordations and
      certifications in connection with such Seller Registered Intellectual
      Property have been filed with the relevant patent, copyright, trademark or
      other authorities in the United States or foreign jurisdictions, as the
      case may be, for the purpose of maintaining such Seller Registered
      Intellectual Property.

            (d)  Seller owns and has good and exclusive title to, or has
      licenses (sufficient for the conduct of the Business as currently
      conducted and as proposed to be conducted) to, each item of Seller
      Intellectual Property, free and clear of any Lien; Seller is the exclusive
      owner of all trademarks and service marks, trade names and domain names
      used in connection with the operation or conduct of the Business,
      including the sale of any products by the Business, free and clear of all
      Liens; and Seller's licensing of any of its trademarks and service marks
      has been subject to commercially reasonable quality control of Seller and
      Seller has exercised that quality control in a consistent and commercially
      reasonable manner.

            (e)  Seller owns exclusively and has good title to all copyrighted
      works used in the Business free and clear of all Liens. Schedule 4.13(e)
      lists all works of original authorship used in the operation of the
      Business and prepared by or on behalf of Seller (including software
      programs) by title, version number, author(s) and publication date (if
      any), regardless of whether Seller has obtained or is seeking a copyright
      registration for such works.

            (f)  Without limiting the generality of Section 4.13(a), to the
      extent that any Seller Intellectual Property has been developed or created
      by a third party for Seller, Seller has a written agreement with such
      third party with respect thereto and Seller thereby has obtained ownership
      of and is the exclusive owner of all of such third party's Intellectual
      Property in such work, material or invention.

                                      -25-
<PAGE>

            (g) Without limiting the generality of Section 4.13(a), to the
      extent that any Seller Intellectual Property was: (i) developed by
      Seller's employees, each such employee was working within the scope of his
      or her employment at the time of such development and, except as set forth
      on Schedule 4.13(g), has executed appropriate instruments of assignment in
      favor of Seller as assignee that have conveyed and that will convey to
      Seller all intellectual or other property rights in such Seller
      Intellectual Property; (ii) developed by agents, consultants, contractors
      or others, such agents, consultants, contractors or others have executed
      appropriate instruments of assignment in favor of Seller as assignee that
      have conveyed to Seller ownership of all intellectual property rights in
      such Seller Intellectual Property; or (iii) acquired by Seller in
      connection with acquisitions, Seller obtained appropriate representations,
      warranties and indemnities from the transferring party relating to the
      title to such Seller Intellectual Property. Seller has not received notice
      from any third party claiming any right, title or interest in Seller
      Intellectual Property.

            (h) The operation of the Business as it is currently conducted,
      including Seller's design, development, marketing and sale of the products
      of the Business (including with respect to products currently under
      development), to the Knowledge of Seller has not and does not infringe or
      misappropriate in any manner the Intellectual Property of any third party
      or, to the Knowledge of Seller, constitute unfair competition or trade
      practices under the Laws of any jurisdiction.

            (i) To the Knowledge of Seller, no Person has or is infringing or
      misappropriating any Seller Intellectual Property.

            (j) Without limiting the generality of Section 4.13(a), except as
      set forth on Schedule 4.13(j), Seller has taken reasonable steps to
      protect the rights of Seller in the Confidential Information and any trade
      secret or confidential information of third parties used in the Business,
      and, except under confidentiality obligations, there has not been any
      disclosure by Seller of any Confidential Information or any such trade
      secret or confidential information of third parties.

            (k) Seller has not granted any license, sublicense or similar right
      with respect to Seller Intellectual Property;

            (l) Without limiting the generality of Section 4.13(a), to the
      Knowledge of Seller, Seller is not obligated to pay a royalty, grant a
      license (including pass through licenses), or provide other consideration
      (including pass through rights) to any third party in connection with the
      Seller Intellectual Property;

            (m) Seller owns without Lien or restriction, or has the full legal
      right (which right is assignable to Purchaser) to use, all (i) cell lines,
      (ii) biological and chemical assays, (iii) chemical and biological
      reagents, and (iv) media and sera used in any respect in the conduct the
      Business;

            (n) Seller owns without Lien or restriction, or has the full legal
      right (which right is assignable to Purchaser) to use, all products and
      services offered in the conduct of

                                      -26-
<PAGE>

      the Business.

      Section 4.14 Software.

            (a)    Schedule 4.14(a) sets forth a true and complete list of: (i)
      Seller Software, and (ii) all technical and restricted materials relating
      to the acquisition, design, development, use or maintenance of computer
      code program documentation and materials used in connection with the
      operation of the Business.

            (b)    The use of Seller Software does not breach any term of any
      license or other contract between Seller and any third party. Seller is in
      compliance in all material respects with the terms and conditions of all
      license agreements in favor of Seller relating to Seller Software.

            (c)    Seller has not granted rights in Seller Software to any third
      party.

    Section 4.15   Customer Relations. Schedule 4.15 contains a complete and
accurate list of the names and addresses of the ten largest customers of the
Business. Seller maintains good commercial relations with each of the ten
largest customers of the Business and, to the Knowledge of Seller, no event has
occurred that could materially and adversely affect Seller's relations with any
such customer. None of the ten largest customers of the Business has informed
Seller that it will decrease such customer's purchase of the Business' products.
None of the Business's ten largest customers have provided any notice and Seller
does not possess any Knowledge to the effect that any such customer or any of
Seller's top ten suppliers may terminate or materially alter its business
relations with Seller, either as a result of the transactions contemplated
hereby or otherwise. Purchaser acknowledges and agrees that Seller has not
informed any of the ten largest customers of the Division of the transaction
contemplated hereby.

    Section 4.16   Receivables. A schedule of the Receivables of Seller as of
December 31, 2004, showing the amount of such Receivable and an aging of amounts
due thereunder, is attached hereto as Schedule 2.1(j). Except as set forth on
Schedule 2.1(j), to the Knowledge of Seller, the debtors to which the
Receivables relate are not in or subject to a bankruptcy or insolvency
proceeding and none of the Receivables have been made subject to an assignment
for the benefit of creditors. Except as set forth on Schedule 2.1(j), all
Receivables (i) are valid, existing and collectible in a manner consistent with
Seller's past practice without resort to legal proceedings or collection
agencies, (ii) represent monies due for goods sold and delivered or services
rendered in the ordinary course of business and (iii) are not subject to any
refund or adjustment or any defense, right of set-off, assignment, restriction,
security interest or other Lien (including without limitation any Inventory
return or similar credit). Except as set forth on Schedule 2.1(j), there are no
disputes regarding the collectibility of any such Receivables. Seller has not
factored any Receivables and the Receivables are not subject to any Liens.

    Section 4.17   Licenses. Schedule 2.1(k) is a true and complete list of all
Licenses held by Seller and used in the operation of the Business. Seller owns
or possesses all Licenses that are necessary to enable it to carry on the
Business as presently conducted (the "Business Licenses"). All Business Licenses
are valid, binding and in full force and effect. The execution, delivery and
performance hereof and the consummation of the transactions contemplated hereby

                                      -27-
<PAGE>

shall not adversely affect any Business License. Seller has taken all necessary
action to maintain each Business License, except where the failure to so act
shall not have a Material Adverse Effect on Seller or the Business. No loss or
expiration of any Business License is pending or, to the Knowledge of Seller,
threatened (other than expiration upon the end of any term). Schedule 2.1(k)
identifies with an asterisk each Business License set forth therein which by its
terms cannot be transferred to Purchaser on the Closing Date.

      Section 4.18 Product and Service Warranties. Except as set forth on
Schedule 4.18, Seller does not make any express warranty or guaranty as to goods
sold, or services provided by, the Business.

      Section 4.19 Brokers, Finders and Investment Bankers. Neither Seller, nor
any officer, member, director or employee of Seller nor any Affiliate of Seller,
has employed any broker, finder or investment banker or incurred any liability
for any investment banking fees, financial advisory fees, brokerage fees or
finders' fees in connection with the transactions contemplated hereby.

      Section 4.20 Conduct of Business by Seller. Since September 30, 2004,
Seller has operated the Business and the Division in the ordinary course of
business.

      Section 4.21 Termination of Malavarca Agreement. Seller has terminated the
Malavarca Agreement and received a release from Mr. Malavarca covering any and
all claims arising under or related to the Malavarca Agreement that Mr.
Malavarca could otherwise assert against Parent, Seller or Purchaser.

                                    ARTICLE V
     REPRESENTATIONS AND WARRANTIES OF PURCHASER, SEROLOGICALS AND CHEMICON

      Purchaser, Serologicals and Chemicon hereby jointly and severally
represent and warrant to Seller as follows:

      Section 5.1 Organization. Each of Purchaser, Serologicals and Chemicon is
a corporation duly organized, validly existing and in good standing under the
laws of the state of its incorporation and has all requisite corporate power and
authority to own, lease and operate its properties and to carry on its business
as now being conducted. Purchaser is a wholly-owned subsidiary of Chemicon.

      Section 5.2 Authorization. Each of Purchaser, Serologicals and Chemicon
has full corporate power and authority to execute and deliver this Agreement and
the Purchaser Ancillary Documents, to perform its obligations hereunder and
thereunder and to consummate the transactions contemplated hereby and thereby.
The execution and delivery of this Agreement and the Purchaser Ancillary
Documents by Purchaser, Serologicals and Chemicon, the performance by Purchaser,
Serologicals and Chemicon of their obligations hereunder and thereunder, and the
consummation of the transactions provided for herein and therein have been duly
and validly authorized by all necessary corporate action on the part of
Purchaser,

                                      -28-
<PAGE>

Serologicals and Chemicon. This Agreement and the Purchaser Ancillary Documents
have been duly executed and delivered by each of Purchaser, Serologicals and
Chemicon and constitute the valid and binding agreements of each of Purchaser,
Serologicals and Chemicon enforceable against each of Purchaser, Serologicals
and Chemicon in accordance with their respective terms, subject to applicable
bankruptcy, insolvency and other similar Laws affecting the enforceability of
creditors' rights generally, general equitable principles and the discretion of
courts in granting equitable remedies.

      Section 5.3 Defaults, Consents, Etc. The execution and delivery of this
Agreement and the consummation of the transactions contemplated hereby will not
result in a material violation by Purchaser, Serologicals or Chemicon of, or
constitute a default by, Purchaser, Serologicals or Chemicon under, any material
contractual obligation of Purchaser, Serologicals or Chemicon or any legal
requirement applicable to the Purchaser, Serologicals or Chemicon. No approval,
consent, authorization or other order of, and no declaration, filing,
registration, qualification or recording with, any governmental authority or any
other person, including without limitation, any party to any contractual
obligation of the Purchaser, Serologicals or Chemicon, is required to be made by
or on behalf of the Purchaser, Serologicals or Chemicon for the execution,
delivery or performance of this Agreement by the Purchaser, Serologicals or
Chemicon, except for those contemplated hereby or which have been or will be
obtained or for which waivers will be obtained prior to the Closing Date.

      Section 5.4 Brokers, Finders and Investment Bankers. Neither Purchaser,
Serologicals, Chemicon nor any officer, member, director or employee of
Purchaser, Serologicals nor any Affiliate of Purchaser, Serologicals or
Chemicon, have employed any broker, finder or investment banker or incurred any
liability for any investment banking fees, financial advisory fees, brokerage
fees or finders' fees in connection with the transactions contemplated hereby.

      Section 5.5 Disclosure of Information. Each of Purchaser, Serologicals and
Chemicon has had an opportunity to visit and inspect the Business and the assets
of the Division, to receive all additional information related to the Seller
requested by it and to ask questions of and receive answers from the Seller
regarding the Business and the Division. Prior to the execution of this
Agreement, Seller has delivered to the Purchaser true and complete copies of all
documents or instruments identified or referred to in the Schedules. Such
visits, inspections, questions, investigations and deliveries do not and will
not constitute adequate disclosure of those facts required to be disclosed on
any Schedule to this Agreement, and notice of their contents (other than by
express reference on a Schedule) will in no way limit the Seller's and Parent's
other obligations or the Purchaser's rights under the Agreement.

                                   ARTICLE VI
                        CERTAIN COVENANTS AND AGREEMENTS

      Section 6.1 Public Announcements. Seller shall not, without the prior
written consent of Purchaser, make any public announcement regarding this
Agreement or the transactions contemplated hereby, except as may be required by
Law; provided, that to the extent practicable,

                                      -29-
<PAGE>

Seller shall give the Purchaser advance notice of any public announcement
regarding this Agreement or the transactions contemplated hereby that is
required by Law.

      Section 6.2 Employees.

            (a)   Schedule 4.10 lists all of the Division Employees as of the
      Closing Date. Subject to the consummation of the transactions contemplated
      by this Agreement. Seller will terminate employment of the Division
      Employees as of the Closing Date and Purchaser shall offer employment to
      each Division Employee at substantially the same rate of salary or wages
      and, to the extent practicable, for the same position as the Division
      Employee had with Seller immediately prior to the Closing. Division
      Employees who accept Purchaser's offer of employment are herein referred
      to as "Transferred Employees." Notwithstanding the foregoing, Purchaser
      retains the right to terminate the employment of any Transferred Employee
      or to change the terms and conditions of the employment of any Transferred
      Employee following the Closing.

            (b)   Purchaser and its Affiliates will recognize all service of the
      Transferred Employees with Seller for purposes of determining the period
      of employment of any Transferred Employee under any vacation, severance,
      sick leave or other paid time off plan, as well as for determining other
      entitlements and terms of employment affected by seniority under the
      employment policies of Purchaser and its Affiliates.

            (c)   Purchaser and its Affiliates shall (1) waive any limitations
      regarding pre-existing conditions and eligibility waiting periods under
      any health benefit plan maintained for the benefit of Transferred
      Employees (and their covered dependents), but only to the extent Seller's
      health benefit plans waived any such limitations or waiting periods, and
      (2) subject to the Seller's performance of its obligations set forth in
      the following sentence, provide the Transferred Employees (and their
      covered dependents) with credit for any co-payments and deductibles paid
      from the first date of the applicable coverage period in which the Closing
      occurs until the Closing Date for the purposes of satisfying any
      applicable co-payments, deductibles or out-of-pocket requirements under
      the health plans of Purchaser and its Affiliates during the balance of the
      coverage period for such plans in effect on the Closing Date. Seller shall
      cause its plan administrator to provide to Purchase as soon as practicable
      following the Closing a schedule setting forth the amounts of co-payments
      and deductibles incurred by the Transferred Employees for that portion of
      Seller's current fiscal year ending on the Closing Date.

            (d)   Effective as of the Closing, all Transferred Employees will
      cease to be participants in the Seller Benefit Plans and will become
      participants in any corresponding plans of Purchaser and its Subsidiaries,
      including, without limitation, group health and other welfare benefit
      plans.

            (e)   On the Closing Date, Seller shall determine the amount owed by
      Seller to the Transferred Employees with respect to accumulated sick pay
      and accrued vacation, holiday or other paid time off as of the Closing
      Date pursuant to Seller's policies regarding such matters and shall make
      full payment therefor to such employees.

                                      -30-
<PAGE>

      Section 6.3 Reserved.

      Section 6.4 Insurance. If requested by Purchaser, Seller shall in good
faith cooperate with Purchaser and take all actions reasonably requested by
Purchaser that are necessary or desirable to permit Purchaser to have available
to it the benefits (whether direct or indirect) of the insurance policies
maintained by or on behalf of Seller that are currently in force. All costs
relating to the actions described in this Section 6.4 shall be borne solely by
Purchaser.

      Section 6.5 Name Change. As promptly as practicable following the date
hereof, Seller and Parent shall remove any reference to the name "Specialty
Media", or any other trade name used by Seller or Parent in the conduct or
operation of the Business from their signage, stationary, business cards,
website and the like.

      Section 6.6 Non-Competition.

            (a)   Confidential Information. The Parties acknowledge the
      execution and delivery of that certain Joint Confidentiality Agreement
      dated as of June 15, 2004, between Parent and Serologicals (the "Joint
      Confidentiality Agreement"). The Parties hereby agree to abide by the
      terms of such Joint Confidentiality Agreement with respect to any
      Confidential Information of the other obtained by them in connection with
      the transactions contemplated by this Agreement.

            (b)   Noncompetition. Neither Seller nor Parent nor any of their
      respective affiliates shall, during the Noncompete Period, in any manner,
      directly or indirectly or by assisting any other Person, engage in, have
      an equity or profit interest in, or render services (of an executive,
      marketing, manufacturing, research and development, administrative,
      financial, consulting or other nature) to any Person that provides or
      sells products or services similar to those of the Business; provided,
      however, that notwithstanding the foregoing, Seller and Parent shall be
      permitted to engage in the MCS Business and the Sentigen Biosciences
      Business.

            (c)   Severability. In the event a judicial or arbitral
      determination is made that any provision of this Section 6.6 constitutes
      an unreasonable or otherwise unenforceable restriction against the
      Purchaser or Seller the provisions of this Section 6.6 shall be rendered
      void only to the extent that such judicial or arbitral determination finds
      such provisions to be unreasonable or otherwise unenforceable with respect
      to the Purchaser or Seller. In this regard, any judicial authority
      construing this Agreement shall be empowered to sever any prohibited
      business activity or any time period from the coverage of this Section 6.6
      and to apply the provisions of this Section 6.6 to the remaining business
      activities and the remaining time period not so severed by such judicial
      or arbitral authority. Moreover, notwithstanding the fact that any
      provision of this Section 6.6 is determined not to be specifically
      enforceable, the Purchaser shall nevertheless be entitled to recover
      monetary damages as a result of the breach of such provision by Seller.
      The time period during which the prohibitions set forth in this Section
      6.6 shall apply shall be tolled and suspended for a period equal to the
      aggregate time during which Seller violates such prohibitions in any
      respect.

                                      -31-
<PAGE>

            (d)   Injunctive Relief. Any remedy at law for any breach of the
      provisions contained in this Section 6.6 shall be inadequate and the
      Purchaser, Seller or Parent, as the case may be, shall be entitled to
      injunctive relief in addition to any other remedy the Purchaser, Seller or
      Parent, as the case may be, might have hereunder.

      Section 6.7 Record Retention and Access. The Parties agree as follows with
respect to the documents and records of the Division.

            (a)   During the Transition Period (as defined in the Transition
      Services Agreement) and for a period of five years thereafter, Seller
      shall provide Purchaser with access to and copies of such records at such
      location(s) as Seller and Purchaser shall mutually agree, at such time(s)
      as Seller and Purchaser shall mutually agree; provided, that, any such
      copies shall be made at the expense of Purchaser.

            (b)   Purchaser shall provide Seller with access to and copies of
      such records at such location(s) as Seller and Purchaser shall mutually
      agree, at such time(s) as Seller and Purchaser shall mutually agree.

            (c)   Seller shall use commercially reasonable efforts to provide to
      Purchaser, as promptly as practicable following the Closing Date and in
      any event no later than 60 days following the Closing Date, a copy of the
      master and data files in a format compatible with the Purchaser's
      information technology system.

      Section 6.8 Confidential Information. Purchaser acknowledges that it may
have received or may receive Confidential Information (as defined in the Joint
Confidentiality Agreement) of Seller or Parent that is not an Asset and
Purchaser agrees that, subject to the terms, conditions, limitations, time
periods and provisions of the Joint Confidentiality Agreement, Purchaser is not
obtaining any ownership interest in any such Confidential Information that is
not otherwise an Asset and will not use or disclose any Confidential Information
except as may be permitted by the Joint Confidentiality Agreement.

                                   ARTICLE VII
                                 INDEMNIFICATION

      Section 7.1 Indemnification Obligations of Seller. Subject to Section 7.2,
Seller and Parent shall, jointly and severally, indemnify, defend and hold
harmless Purchaser Indemnified Parties from, against, and in respect of, any and
all claims, liabilities, obligations, damages, losses, costs, expenses,
penalties, fines and judgments (at equity or at law, including statutory and
common) and damages whenever arising or incurred (including amounts paid in
settlement, costs of investigation and reasonable attorneys' fees and expenses)
arising out of or relating to:

            (a)   the Excluded Liabilities other than those Excluded Liabilities
      enumerated in Section 2.4(b);

            (b)   any breach or inaccuracy of any representation or warranty
      made by Seller in this Agreement or the Seller Ancillary Documents;

                                      -32-
<PAGE>

            (c)   any breach of any covenant, agreement or undertaking made by
      Seller in this Agreement or the Seller Ancillary Documents;

            (d)   any fraud, willful misconduct or bad faith of Seller in
      connection with this Agreement or the Seller Ancillary Documents;

            (e)   non-compliance by the Parties with any applicable bulk sales
      Law; or

            (f)   any Environmental Conditions present on, at or underlying the
      Owned Real Property on or prior to the Closing Date, excluding losses
      arising out of the presence of Hazardous Materials that have migrated or
      are migrating on to the Owned Real Property form property owned by a third
      party.

The claims, liabilities, obligations, losses, costs, expenses, penalties, fines
and judgments (at equity or at law, including statutory and common) and damages
whenever arising or incurred of the Purchaser Indemnified Parties including,
without limitation, (i) amounts paid in settlement, costs of investigation,
reasonable attorneys' fees and expenses; (ii) the expenses and costs of any
litigation necessary to establish the merits and amount of any direct claim made
by any Purchaser Indemnified Party in such proportion (including all of such
expenses and costs) as determined by the judge or arbitrator in such proceeding
based on the amount of the indemnification sought by such Purchaser Indemnified
Party in such proceeding and the amount of indemnification awarded by the judge
or arbitrator in such proceeding; and (iii) the expenses and costs of any
litigation necessary to establish the merits and amount of any direct claim made
by any Purchaser Indemnified Party in such proportion (including all of such
expenses and costs) as determined by the judge or arbitrator in such proceeding
based on the amount of the indemnification sought by such Purchaser Indemnified
Party in such proceeding and the amount of indemnification awarded by the judge
or arbitrator in such proceeding, described in this Section 7.1 as to which
Purchaser Indemnified Parties are entitled to indemnification are collectively
referred to as "Purchaser Losses".

      Section 7.2 Indemnification Obligations of Purchaser. Purchaser,
Serologicals and Chemicon shall, jointly and severally, indemnify and hold
harmless Seller Indemnified Parties from, against and in respect of any and all
claims, liabilities, obligations, losses, damages, costs, expenses, penalties,
fines and judgments (at equity or at law, including statutory and common) and
damages whenever arising or incurred (including amounts paid in settlement,
costs of investigation and reasonable attorneys' fees and expenses) arising out
of or relating to:

            (a)   the Assumed Liabilities;

            (b)   any breach or inaccuracy of any representation or warranty
      made by Purchaser, Chemicon or Serologicals in this Agreement or in any
      Purchaser Ancillary Document;

            (c)   any breach of any covenant, agreement or undertaking made by
      Purchaser, Chemicon or Serologicals in this Agreement or in any Purchaser
      Ancillary Document; or

            (d)   any fraud, willful misconduct or bad faith of Purchaser,
      Chemicon or Serologicals in connection with this Agreement or Purchaser
      Ancillary Documents.

                                      -33-
<PAGE>

The claims, liabilities, obligations, losses, costs, expenses, penalties, fines
and judgments (at equity or at law, including statutory and common) and damages
whenever arising or incurred of the Seller Indemnified Parties including,
without limitation, (i) amounts paid in settlement, costs of investigation,
reasonable attorneys' fees and expenses; (ii) the expenses and costs of any
litigation necessary to establish the merits and amount of any direct claim made
by any Seller Indemnified Party in such proportion (including all of such
expenses and costs) as determined by the judge or arbitrator in such proceeding
based on the amount of the indemnification sought by such Seller Indemnified
Party in such proceeding and the amount of indemnification awarded by the judge
or arbitrator in such proceeding; and (iii) the expenses and costs of any
litigation necessary to establish the merits and amount of any direct claim made
by any Seller Indemnified Party in such proportion (including all of such
expenses and costs) as determined by the judge or arbitrator in such proceeding
based on the amount of the indemnification sought by such Seller Indemnified
Party in such proceeding and the amount of indemnification awarded by the judge
or arbitrator in such proceeding, described in this Section 7.2 as to which
Seller Indemnified Parties are entitled to indemnification are collectively
referred to as "Seller Losses".

      Section 7.3 Indemnification Procedure.

            (a)   Promptly following receipt by an Indemnified Party of notice
      by a third party (including any Governmental Entity) of any complaint or
      the commencement of any audit, investigation, action or proceeding (a
      "Third-Party Claim") with respect to which such Indemnified Party may be
      entitled to receive payment from the other Party for any Purchaser Losses
      or any Seller Losses (as the case may be), such Indemnified Party shall
      notify Purchaser or Parent, as the case may be (the "Indemnifying Party"),
      of the Indemnified Party's receipt of such notice; provided, however, that
      the failure to so notify the Indemnifying Party shall not relieve the
      Indemnifying Party of its obligations hereunder with respect to a
      Third-Party Claim except to the extent that the Indemnifying Party
      demonstrates that the defense of such Third-Party Claim has been actually
      prejudiced by the Indemnified Party's failure to give such notice. The
      Indemnifying Party shall have the right, upon written notice delivered to
      the Indemnified Party within 20 days thereafter to assume the defense of
      such audit, investigation, action or proceeding, including the employment
      of counsel reasonably satisfactory to the Indemnified Party and the
      payment of the fees and disbursements of such counsel. In the event,
      however, that the Indemnifying Party declines or fails to assume the
      defense of such Third-Party Claim on the terms provided above or to employ
      counsel reasonably satisfactory to the Indemnified Party, in either case
      within such 20-day period, then any Purchaser Losses or any Seller Losses
      (as the case may be), shall include the reasonable fees and disbursements
      of counsel for the Indemnified Party as incurred; provided, however, that
      any Purchaser Losses or any Seller Losses (as the case may be) shall not
      include the fees and disbursements of more than one counsel for all
      Indemnified Parties in any jurisdiction with respect to any single
      Third-Party Claim. In any Third-Party Claim for which indemnification is
      being sought hereunder, the Indemnified Party or the Indemnifying Party,
      whichever is not assuming the defense of such action, shall have the right
      to participate in such matter and to retain its own counsel at such
      Party's own expense. The Indemnifying Party or the Indemnified Party (as
      the case may be) shall at all times use reasonable efforts to keep the
      Indemnifying Party or Indemnified Party (as the case may be) reasonably
      apprised of the status of the defense of any Third-Party

                                      -34-
<PAGE>

      Claim that it is maintaining and to cooperate in good faith with each
      other with respect to the defense of any such matter.

            (b)   No Indemnified Party may settle or compromise any claim or
      consent to the entry of any judgment with respect to which indemnification
      is being sought hereunder without the prior written consent of the
      Indemnifying Party, unless (i) the Indemnifying Party fails to assume and
      maintain the defense of such claim pursuant to Section 7.3(a) or (ii) such
      settlement, compromise or consent includes an unconditional release of the
      Indemnifying Party and its officers, directors, employees and Affiliates
      from all liability arising out of such claim. An Indemnifying Party may
      not, without the prior written consent of the Indemnified Party, settle or
      compromise any claim or consent to the entry of any judgment with respect
      to which indemnification is being sought hereunder unless (x) such
      settlement, compromise or consent includes an unconditional release of the
      Indemnified Party and its officers, directors, employees and Affiliates
      from all liability arising out of such claim, (y) does not contain any
      admission or statement suggesting any wrongdoing or liability on behalf of
      the Indemnified Party and (z) does not contain any equitable order,
      judgment or term that in any manner affects, restrains or interferes with
      the business of the Indemnified Party or any of the Indemnified Party's
      Affiliates.

            (c)   In the event an Indemnified Party claims a right to payment
      pursuant hereto (other than pursuant to Section 7.3(a)), such Indemnified
      Party shall send written notice of such claim to the appropriate
      Indemnifying Party. Such notice shall specify the basis for such claim.
      The failure by any Indemnified Party so to notify the Indemnifying Party
      shall not relieve the Indemnifying Party from any liability that it may
      have to such Indemnified Party with respect to any claim made pursuant to
      this Section 7.3(c), it being understood that notices for claims in
      respect of a breach of a representation or warranty must be delivered
      prior to the expiration of the survival period for such representation or
      warranty under Section 7.4. In the event the Indemnifying Party does not
      notify the Indemnified Party within 30 days following its receipt of such
      notice that the Indemnifying Party disputes its liability to the
      Indemnified Party under this Article or the amount thereof, the claim
      specified by the Indemnified Party in such notice shall be conclusively
      deemed a liability of the Indemnifying Party under this Article VII, and
      the Indemnifying Party shall pay the amount of such liability to the
      Indemnified Party on demand or, in the case of any notice in which the
      amount of the claim (or any portion of the claim) is estimated, on such
      later date when the amount of such claim (or such portion of such claim)
      becomes finally determined. In the event the Indemnifying Party has timely
      disputed its liability with respect to such claim as provided above, as
      promptly as possible, such Indemnified Party and the appropriate
      Indemnifying Party shall establish the merits and amount of such claim (by
      mutual agreement, litigation, arbitration or otherwise) and, within five
      Business Days following the final determination of the merits and amount
      of such claim, the Indemnifying Party shall pay to the Indemnified Party
      immediately available funds in an amount equal to such claim as determined
      hereunder.

      Section 7.4 Claims Period. The Claims Periods hereunder shall begin on the
date hereof and terminate as follows:

                                      -35-
<PAGE>

            (a)   with respect to Purchaser Losses arising under (i) Section
      7.1(b) with respect to any breach or inaccuracy of any representation or
      warranty in Section 4.2 (Authorization), the second sentence of Section
      4.5 (Title to Assets; Related Matters), and Section 4.19 (Brokers, Finders
      and Investment Bankers) (collectively, the "Seller Surviving
      Representations") or (ii) Sections 7.1(a), 7.1(c), 7.1(d) and 7.1(e)
      (collectively, the "Seller Surviving Obligations"), the Claims Period
      shall continue indefinitely;

            (b)   with respect to Seller Losses arising under (i) Section 7.2(b)
      with respect to any breach or inaccuracy of any representation or warranty
      in Section 5.2 (Authorization), and Section 5.4 (Brokers, Finders and
      Investment Bankers) (collectively, the "Purchaser Surviving
      Representations"), or (ii) Sections 7.2(a), 7.2(c) and 7.2(d)
      (collectively, the "Purchaser Surviving Obligations"), the Claims Period
      shall continue indefinitely; and

            (c)   with respect to all other Purchaser Losses or Seller Losses
      arising hereunder, the Claims Period shall terminate on the date that is
      two years following the Closing Date.

Notwithstanding the foregoing, if, prior to the close of business on the last
day of the applicable Claims Period, an Indemnifying Party shall have been
properly notified of a claim for indemnity hereunder and such claim shall not
have been finally resolved or disposed of at such date, such claim shall
continue to survive and shall remain a basis for indemnity hereunder until such
claim is finally resolved or disposed of in accordance with the terms hereof.

      Section 7.5 Liability Limits. Notwithstanding anything to the contrary set
forth herein, Purchaser Indemnified Parties shall not make a claim against
Seller for indemnification under this Article VII for Purchaser Losses, and
Seller Indemnified Parties shall not make a claim against Purchaser for
indemnification under this Article VII for Seller Losses, unless and until the
aggregate amount of such Purchaser Losses or Seller Losses, as the case may be,
exceeds $100,000 (the "Basket"), in which event Purchaser Indemnified Parties
may claim indemnification for all Purchaser Losses, or Seller Indemnified
Parties may claim indemnification for all Seller Losses, as the case may be,
including the initial $100,000; provided, however, the Seller Surviving
Obligations, the Seller Surviving Representations, the Purchaser Surviving
Obligations, and the Purchaser Surviving Representations shall not be subject to
the Basket. Seller's maximum liability for all Purchaser Losses, and Purchaser's
maximum liability for all Seller Losses, as the case may be, shall be equal to
the Purchase Price.

      Section 7.6 Investigations. The respective representations and warranties
of the Parties contained in this Agreement or any certificate or other document
delivered by any Party at or prior to the Closing Date and the rights to
indemnification set forth in Article VII shall not be deemed waived or otherwise
affected by any investigation made, or knowledge acquired, by a Party.

                                      -36-
<PAGE>

                                  ARTICLE VIII
                            MISCELLANEOUS PROVISIONS

      Section 8.1 Notices. All notices, communications and deliveries required
or made hereunder must be made in writing signed by or on behalf of the Party
making the same, shall specify the Section hereunder pursuant to which it is
given or being made, and shall be delivered personally or by telecopy
transmission or by a national overnight courier service or by registered or
certified mail (return receipt requested) (with postage and other fees prepaid)
as follows:

      To Purchaser,
      Serologicals or
      Chemicon:            Chemicon Specialty Media, Inc.
                           5655 Spalding Drive
                           Norcross, Georgia 30092
                           Attn: Philip Theodore
                           Telecopy No.:(678) 728-2020

      with a copy to:      King & Spalding LLP
                           191 Peachtree Street
                           Atlanta, Georgia  30303-1763
                           Attn: G. Roth Kehoe II
                           Telecopy No.:(404) 572-5136

      To Seller
      or Parent:           Sentigen Holding Corp.
                           445 Marshall Street
                           Phillipsburg, New Jersey 08865
                           Attn: Joseph K. Pagano
                           Telecopy No.(908) 454-4792

      with a copy to:      Fulbright & Jaworski LLP
                           666 Fifth Avenue
                           New York, New York 10103
                           Attn: Merrill M. Kraines
                           Telecopy No.:(212) 318-3400

or to such other representative or at such other address of a party as such
party may furnish to the other parties in writing. Any such notice,
communication or delivery shall be deemed given or made (a) on the date of
delivery, if delivered in person, (b) upon transmission by facsimile if receipt
is confirmed by telephone, (c) on the first Business Day following delivery to a
national overnight courier service or (d) on the fifth Business Day following it
being mailed by registered or certified mail.

      Section 8.2 Schedules and Exhibits. The Schedules and Exhibits are hereby
incorporated into this Agreement and are hereby made a part hereof as if set out
in full herein.

                                      -37-
<PAGE>

      Section 8.3 Assignment; Successors in Interest. No assignment or transfer
by any Party of such Party's rights and obligations hereunder shall be made
except with the prior written consent of the other Parties; provided, that
Purchaser shall, without the obligation to obtain the prior written consent of
any other Party, be entitled to assign this Agreement or all or any part of its
rights or obligations hereunder to one or more Affiliates of Purchaser. This
Agreement shall be binding upon and shall inure to the benefit of the Parties
and their respective successors and permitted assigns, and any reference to a
Party shall also be a reference to the successors and permitted assigns thereof.

      Section 8.4 Captions. The titles, captions and table of contents contained
herein are inserted herein only as a matter of convenience and for reference and
in no way define, limit, extend or describe the scope of this Agreement or the
intent of any provision hereof.

      Section 8.5 Controlling Law; Amendment. This Agreement shall be governed
by and construed and enforced in accordance with the internal Laws of the State
of New York without reference to its choice of law rules. This Agreement may not
be amended, modified or supplemented except by written agreement of the Parties.

      Section 8.6 Severability. Any provision hereof that 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 hereof, and any such prohibition or unenforceability in any
jurisdiction shall not invalidate or render unenforceable such provision in any
other jurisdiction. To the extent permitted by Law, each Party hereby waives any
provision of law that renders any such provision prohibited or unenforceable in
any respect.

      Section 8.7 Counterparts. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, and it shall not be
necessary in making proof of this Agreement or the terms hereof to produce or
account for more than one of such counterparts.

      Section 8.8 Enforcement of Certain Rights. Nothing expressed or implied
herein is intended, or shall be construed, to confer upon or give any Person
other than the Parties, and their successors or permitted assigns, any right,
remedy, obligation or liability under or by reason of this Agreement, or result
in such Person being deemed a third-party beneficiary hereof.

      Section 8.9 Waiver. Any agreement on the part of a Party to any extension
or waiver of any provision hereof shall be valid only if set forth in an
instrument in writing signed on behalf of such Party. A waiver by a Party of the
performance of any covenant, agreement, obligation, condition, representation or
warranty shall not be construed as a waiver of any other covenant, agreement,
obligation, condition, representation or warranty. A waiver by any Party of the
performance of any act shall not constitute a waiver of the performance of any
other act or an identical act required to be performed at a later time.

      Section 8.10 Integration. This Agreement and the documents executed
pursuant hereto supersede all negotiations, agreements and understandings among
the Parties with respect to the subject matter hereof and constitute the entire
agreement among the Parties with respect thereto, except for the following:

                                      -38-
<PAGE>

            (a) the Joint Confidentiality Agreement;

            (b) that certain Letter Agreement, dated as of December 14, 2004, by
      and between Purchaser and Parent;

            (c) the Real Estate Purchase Agreement;

            (d) the Bill of Sale;

            (e) the Trademark Assignment Agreement;

            (f) the Assignment and Assumption Agreement; and

            (g) the Escrow Agreement.

      Section 8.11 Compliance with Bulk Sales Laws. Each Party hereby waives
compliance by the Parties with the "bulk sales," "bulk transfers" or similar
Laws and all other similar Laws in all applicable jurisdictions in respect of
the transactions contemplated by this Agreement.

      Section 8.12 Further Assurances. Each Party shall deliver to the other
Parties such further information and documents and shall execute and deliver to
the other Parties such further instruments and agreements as any other Party
shall reasonably request to consummate or confirm the transactions provided for
herein, to accomplish the purpose hereof or to assure to any other Party the
benefits hereof.

      Section 8.13 Transaction Costs. Except as provided above or as otherwise
expressly provided herein, (a) Purchaser shall pay its own fees, costs and
expenses incurred in connection herewith and the transactions contemplated
hereby, including the fees, costs and expenses of its financial advisors,
accountants and counsel, and (b) Seller shall pay the fees, costs and expenses
of Seller incurred in connection herewith and the transactions contemplated
hereby, including the fees, costs and expenses of financial advisors,
accountants and counsel to Seller.

      Section 8.14 Arbitration. Any dispute among the Parties relating to this
Agreement, other than those disputes relating to and resolved pursuant to
Section 3.3, shall be resolved in accordance with the arbitration provisions of
this Section 8.14.

            (a)    Any controversy, claim or question or interpretation arising
      out of or relating to this Agreement or the breach thereof shall be
      finally settled by arbitration in the State of New York, under the
      then-effective Commercial Arbitration Rules of the American Arbitration
      Association as modified by this Agreement, and judgment on the award
      rendered by the arbitrators may be entered in any court having
      jurisdiction. The award rendered by the arbitrators shall be final and
      binding on the Parties and not subject to further appeal. Such arbitration
      can be initiated by written notice by Seller to Purchaser or by Purchaser
      to Parent, which notice shall identify the claimant's selected arbitrator.
      The Party receiving such notice shall identify its arbitrator within five
      Business Days following its receipt of such notice. The arbitrator
      selected by the claimant and the arbitrator selected by the respondent
      shall, within five business days of their appointment, select a third
      neutral arbitrator. Upon selection of the third arbitrator,

                                      -39-
<PAGE>

      all arbitrators shall become neutral. The arbitrators shall have the
      authority to award any remedy or relief that a court in the State of New
      York could order or grant, including specific performance of any
      obligation created under this Agreement, the issuance of injunctive or
      other provisional relief, or the imposition of sanctions for abuse or
      frustration of the arbitration process. The arbitration award will be in
      writing.

            (b) It is the intent of the Parties that any arbitration shall be
      concluded as quickly as practicable (but, barring extraordinary
      circumstances, in any event not more than 20 days after the date the third
      arbitrator is selected). Unless the Parties otherwise agree, once
      commenced, the hearing on the disputed matters shall be held four days a
      week until concluded with each hearing date to begin at 9:00 a.m. and to
      conclude at 5:00 p.m. The arbitrators shall use their best efforts to
      issue the final award or awards within a period of five Business Days
      after closure of the proceedings. Failure of the arbitrators to meet the
      time limits of this Section 8.14 shall not be a basis for challenging the
      award.

            (c) Each Party hereby agrees that any legal proceeding instituted to
      enforce an arbitration award hereunder will be brought in the U.S. federal
      or state courts situated in the State of New York.

                                      -40-
<PAGE>

            IN WITNESS WHEREOF, the Parties have caused this Agreement to be
duly executed, as of the date first above written.

                                          CHEMICON SPECIALTY MEDIA, INC.

                                          /s/  Harold W. Ingalls
                                          Title: Vice President, Finance, and
                                                 Chief Financial Officer

                                          CHEMICON INTERNATIONAL, INC.

                                          /s/  Harold W. Ingalls
                                          Title: Vice President, Finance, and
                                                 Chief Financial Officer

                                          SEROLOGICALS CORPORATION

                                          /s/  Harold W. Ingalls
                                          Title: Vice President, Finance, and
                                                 Chief Financial Officer

                                          SENTIGEN HOLDING CORP.

                                          /s/ Fredrick B. Rolff
                                          Title: Chief Financial Officer

                                          CELL & MOLECULAR TECHNOLOGIES, INC.

                                          /s/ Fredrick B. Rolff
                                          Title: Chief Financial Officer<PAGE>

                                                                    EXHIBIT 10.2

                                AGREEMENT OF SALE

      THIS AGREEMENT OF SALE (hereinafter this "Agreement") is made and entered
into as of the 22nd day of February, 2005 (the "Closing Date"), by and between
Chemicon Specialty Media, Inc., a Delaware Corporation, and a wholly owned
subsidiary of Chemicon International, Inc. (the "Purchaser"), Sentigen Holding
Corp., a Delaware Corporation (the "Parent"), and Cell & Molecular Technologies,
Inc., a Delaware Corporation (the "Seller").

                                   WITNESSETH:

      WHEREAS, Seller is the owner of a certain parcel of land (hereinafter the
"Land"), located at 580 Marshall Street, Town of Phillipsburg, County of Warren,
State of New Jersey, identified on the tax assessment map of said Town as Tax
Lot 1005, Block 2 and more particularly described on Exhibit A attached hereto
and made a part hereof, together with all improvements constructed thereon (the
"Improvements"), all right, title and interest, if any, of Seller in and to any
lands lying in the bed of any stream, street road or highway, open or proposed,
in front of, adjacent to or adjoining the Land, and all right, title and
interest of Seller in and to any awards to be made after the Closing Date in
lieu thereof and in and to any unpaid award for damage to the Land by reason of
the change of any street, or rights of way and easements appurtenant to said
Land which are now used in connection therewith (the Land and Improvements are
herein collectively referred to as the "Premises");

      WHEREAS, Purchaser will pay off the loan (the "Loan") secured by the
mortgage held by Phillipsburg National Bank (the "Mortgage") and attached as
Exhibit 4.4(b) of the Asset Purchase Agreement; and

      WHEREAS, Seller is desirous of selling the Premises and the Purchaser is
desirous of purchasing same on the terms and conditions hereafter set forth.

      NOW THEREFORE, in consideration of the covenants and agreements
hereinafter contained, the parties hereto agree as follows:

   1. THE SALE. Upon and subject to the terms and conditions of this Agreement,
      Seller hereby sells and conveys the Premises to Purchaser, and Purchaser
      hereby purchases the Premises from Seller.

   2. CONDITION OF TITLE. The sale is being made by Seller to Purchaser
      hereunder subject to the Permitted Exceptions. "Permitted Exceptions"
      means (i) Liens for taxes, water charges, sewer rents and assessments not
      yet due and payable, (ii) Liens of carriers, warehousemen, mechanics,
      materialmen and repairmen incurred in the ordinary course consistent with
      past practice, (iii) the Mortgage and all Liens arising out of or relating
      to the Loan secured by such Mortgage, (iv) any state of facts which a
      current, accurate survey or inspection of the Premises would disclose; (v)
      zoning, building, land use and other laws, ordinances, rules and
      regulations, and landmark or historic designations; and (vii) all Liens
      and other matters of record.

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   3. CONCURRENT SALE. The sale is being made concurrently with the sale (the
      "Concurrent Sale") to the Purchaser of the personal property comprising
      the assets of the Specialty Media Division (the "Division") of the Seller
      pursuant to that certain Asset Purchase Agreement, dated the date hereof
      (the "Asset Purchase Agreement"), among the Purchaser, the Parent and the
      Seller. The consideration for the sale of the Premises being paid
      concurrently herewith is Four Hundred and Five Thousand Dollars
      ($405,000). All capitalized terms used herein without definition shall
      have the meanings set forth in the Asset Purchase Agreement.

   4. CLOSING DELIVERIES.

         a. The following deliveries are being made by Seller at the closing
            (the "Closing"):

          i.    a bargain and sale deed with covenants against grantor's acts,
                in the proper form for recording so as to convey to Purchaser
                title in fee simple to the Premises, subject only to the
                Permitted Exceptions and the Buyer either assuming or paying off
                the Mortgage, the form of which is attached hereto as Exhibit B.

          ii.   a certified copy of resolutions adopted by the Board of
                Directors of Seller authorizing the sale of the Premises.

          iii.  an Affidavit as to its Non-Foreign Person Status, attached
                hereto as Exhibit C.

          iv.   to the extent then in Seller's possession, originals (if
                available) or copies of all warranties and guarantees affecting
                the Premises or parts thereof, if any, and an executed
                assignment of all Seller's rights, title and interest thereto to
                the extent assignable by Seller.

          v.    all plans, specifications, keys, certificates of occupancy and
                licenses relating to the use, occupancy and operation of the
                Premises, which it may have in its possession, regardless of
                whether originals or copies (where applicable).

          vi.   a completed 1099 reporting form.

          vii.  a closing statement showing all payments, adjustments, and
                prorations of expenses at Closing.

          viii. a "letter of non-applicability", "no further action" letter with
                respect to the Premises or a "negative declaration" from the New
                Jersey Department of Environmental Protection ("NJDEP") stating
                that the Premises are no longer subject to the provisions of the
                Industrial Site Recovery Act ("ISRA").

         b. The Purchaser and the Seller are executing and delivering to the
            other the Post-Closing Adjustment Letter, attached hereto in the
            form of Exhibit D.

   5. APPORTIONMENTS. The following are to be apportioned as of the date hereof,
      with said date being a day of income and expense to Purchaser.

         A. Any taxes, assessments, sewer, water or other municipal charges, if
            any, on the basis of the fiscal year for which assessed. If the
            Closing shall occur before the final tax bill is fixed, the
            apportionment of real estate taxes shall be upon the basis of a
            preliminary tax bill for the Premises.

         B. All assessments imposed by any governmental agency (herein
            "Assessments") for
<PAGE>

            improvements to the Premises for work completed on or before the
            date hereof shall be paid in full by Seller at Closing. If at the
            time for the delivery of the deed, the Premises or any part thereof
            shall be or shall have been affected by an Assessment or Assessments
            for work for which Seller is obligated to pay which are or may
            become payable in annual installments of which the first installment
            is then due or has been paid, then for the purposes of this
            Agreement all of the unpaid installments of any such Assessment,
            including those which are to become due and payable after the
            delivery of the deed, shall be deemed to be due and payable and to
            be liens upon the Premises affected thereby and shall be paid and
            discharged by the Seller thereof, upon the delivery of the deed. The
            provisions of this Section 5.b. shall survive Closing.

         C. Notwithstanding the above, if any of the aforesaid prorations and
            costs cannot be accurately calculated as of the Closing, then such
            proration or cost shall be calculated as soon as reasonably possible
            thereafter and the party owing the other party a sum as a result of
            such calculation shall promptly pay said sum to the other party.

   6. BROKERAGE COMMISSIONS.

         A. Seller represents and warrants that Purchaser has not dealt with any
            broker in connection with the sale of the Premises. Seller will
            indemnify and hold harmless Purchaser from and against any and all
            claims, loss, liability, cost and expense (including reasonable
            attorney's fees) resulting from any claim that may be made against
            Purchaser by any broker or other person claiming a commission, fee
            or other compensation by reason of this transaction, if the same
            shall arise by or on account of any act of Seller or Seller's
            representatives. Purchaser represents and warrants that Purchaser
            has not dealt with any broker in connection with the purchase of the
            Premises. Purchaser will indemnify and hold harmless Seller from and
            against any and all claims, loss, liability, cost and expense
            (including reasonable attorney's fees) resulting from any claim that
            may be made against Seller by any broker or other person claiming a
            commission, fee or other compensation by reason of this transaction,
            if the same shall arise by or on account of any act of Purchaser or
            Purchaser's representatives.

         B. The representations made by Seller and Purchaser in this Section 6
            shall survive the Closing.

   7. MERGER OF ALL PRIOR UNDERSTANDINGS. It is understood and agreed that all
      understandings and agreements heretofore had between Seller and Purchaser
      regarding the Premises are merged in this Agreement, which together with
      the Asset Purchase Agreement fully and completely expresses their
      agreement, and that the same is entered into after full investigation,
      neither party relying upon any statement or representation not embodied in
      this Agreement, made by the other.

   8. NO ORAL CHANGE; ASSIGNMENT. This Agreement may not be changed or
      terminated

<PAGE>

      orally. The stipulations aforesaid are to apply to and bind the legal
      representatives, successors and assigns of the respective parties.
      Purchaser shall have the absolute right to assign this Agreement, but such
      assignment shall not constitute a release by Seller to Purchaser of its
      obligations hereunder.

   9. TITLE INSURANCE; OTHER CLOSING EXPENSES.

         A. SELLER'S COSTS. Seller shall pay, in addition to its apportionments,
            the cost of its legal counsel, the New Jersey realty transfer tax,
            and all other costs and expenses in connection with the transfer of
            title hereunder assumed by Seller.

         B. PURCHASER'S COSTS. Purchaser shall pay, in addition to its
            apportionments, the cost of its legal counsel, accountants,
            engineers, architects and advisors, plus the cost, if applicable, of
            its title commitment or abstract and the title insurance issued
            pursuant thereto, and any survey required or obtained by Purchaser,
            and all other costs and expenses in connection with the transfer of
            title that are not expressly assumed by Seller under this Agreement.

   10. NOTICES. All notices, demands, consents, requests or other communications
      provided for or permitted to be given hereunder by a party hereto pursuant
      to this Agreement must be in writing and must be given in accordance with
      Section 8.1 of the Asset Purchase Agreement. Furthermore, a copy of any
      such notice, demand, consent, request or other communication given to the
      Purchaser shall be furnished in the same manner to Booker, Rabinowitz,
      Trenk, Lubetkin, Tully, DiPasquale & Webster, P.C., 100 Executive Drive,
      Suite 100, West Orange, NJ 07052, Attention: Elnardo J. Webster II.

   11. GOVERNING LAW. The Parties hereby acknowledge that the enforcement of the
      terms and conditions of this Agreement shall be governed by and construed
      and enforced in accordance with the internal laws of the State of New York
      without reference to its choice of law rules. However, enforcement of any
      title provisions or obligations relating directly to the Owned Real
      Property shall be governed by and construed and enforced in accordance
      with the internal laws of the State of New Jersey without reference to its
      choice of law rules.

   12. RECORDING. Neither this Agreement nor any memorandum thereof may be
      recorded.

   13. MISCELLANEOUS.

         A. CAPTIONS AND HEADINGS. The paragraph and/or section headings and the
            arrangement of this Agreement are for the convenience of the parties
            hereto and do not in any way affect, limit, amplify or modify the
            terms and provisions hereof.

         B. PURCHASER'S RESERVED RIGHT. Notwithstanding anything to the contrary
            set forth herein, Purchaser at any time reserves the right to waive
            any contingency in this Agreement.

         C. SINGULAR, PLURAL, ETC. Wherever herein the singular number is used
            the same

<PAGE>

            shall include the plural and the masculine gender shall include the
            feminine and neuter genders and vice versa, as the context shall
            require.

         D. COUNTERPARTS. This Agreement may be executed in several
            counterparts, which shall constitute one and the same instrument.

         E. SUCCESSORS AND ASSIGNS. This Agreement shall inure to the benefit of
            and be binding upon the Seller and Purchaser hereto and their
            respective heirs, personal representatives, successors and assigns.

         F. FURTHER ASSURANCES. Seller and Purchaser each agree to execute any
            and all documents necessary to effectuate the purposes of this
            Agreement.

         G. PATRIOT ACT. Purchaser is not a person or entity with whom United
            States persons or entities are restricted from doing business under
            regulations of the Office of Foreign Asset Control ("OFAC") of the
            Department of the Treasury (including those named on the OFAC's
            specially designated and blocked persons lists) or under any
            statute, executive order (including the September 24, 2001,
            Executive Order Blocking Property and Prohibiting Transactions With
            Persons Who Commit, Threaten to Commit or Support Terrorism), or
            other governmental action and is not and will not engage in any
            dealings or transactions or be otherwise associated with such
            persons or entities.

         H. DEFINITIONS. All definitions in the Asset Purchase Agreement are
            hereby incorporated into this Agreement and are hereby made a part
            as if set forth in full herein.

<PAGE>

      IN WITNESS WHEREOF, the parties have executed this Agreement the day and
year first above written.

                                            CHEMICON SPECIALTY MEDIA, INC.

                                            /s/ Harold Ingalls
                                            ------------------------

                                            SENTIGEN HOLDING CORP.

                                            /s/ Fredrick B. Rolff
                                            ------------------------

                                            CELL & MOLECULAR TECHNOLOGIES,
                                            INC.

                                            /s/ Fredrick B. Rolff
                                            ------------------------

<PAGE>

                                    EXHIBIT A

                               DESCRIPTION OF LAND

All that certain tract, lot and parcel of land lying and being in the Town of
Phillipsburg, County of Warren, and State of New Jersey, being more particularly
described as follows: BEGINNING AT A POINT IN THE NORTHERLY RIGHT OF WAY OF
HECKMAN STREET, SAID POINT BEING THE SOUTHEASTERLY CORNER OF BLOCK 1005, LOT 3
LANDS NOW OR FORMERLY OF THE NORTON PARTNERSHIP AND THE POINT OF BEGINNING
REFERRED TO IN A DEED BETWEEN WILLIAM M. NORTON, JR., AND WILLIAM M. NORTON,
DATED NOVEMBER 6, 1985 RECORDED IN BOOK 938 PAGE 115 AND BEING ALSO DISTANT
367.33 FEET IN A NORTHEASTERLY DIRECTION ALONG THE NORTHWESTERLY SIDE LINE OF
HECKMAN STREET FROM ITS INTERSECTION WITH THE NORTHEASTERLY SIDE LINE OF
ANDERSON STREET AND RUNNING THENCE(1) ALONG THE EASTERLY LINE OF LOT 3, NORTH
THIRTY-SEVEN DEGREES, FIFTY-THREE MINUTES, TWENTY-SEVEN SECONDS WEST (N.
37(degree) 53' 27" W) A DISTANCE OF ONE HUNDRED NINETY-FIVE AND TWENTY-NINE
HUNDREDTHS FEET (195.29') TO A POINT IN THE SOUTHERLY RIGHT OF WAY OF MARSHALL
STREET, BEING THE NORTHEASTERLY CORNER OF LOT 3 THENCE (2) ALONG THE SOUTHERLY
RIGHT OF WAY OF MARSHALL STREET, NORTH SIXTY-EIGHT DEGREES, FORTY-NINE MINUTES,
NO SECONDS EAST (N. 68(degree) 49' 00" E), A DISTANCE OF ONE HUNDRED THIRTY-FIVE
AND NINETY-FOUR HUNDREDTHS FEET (135.94') TO A POINT, BEING THE NORTHWESTERLY
CORNER OF BLOCK 1005, LOT 1 LANDS NOW OR FORMERLY OF WILLIAM M. NORTON, THENCE
(3) ALONG THE WESTERLY LINE OF LOT 1, SOUTH THIRTY-EIGHT DEGREES, THIRTY-EIGHT
MINUTES, FIFTY-THREE SECONDS EAST (S. 38(degree) 38' 53" E) A DISTANCE OF ONE
HUNDRED FIFTY-EIGHT AND SEVENTY-FOUR HUNDREDTHS FEET (158.74') TO A POINT IN THE
NORTHERLY RIGHT OF WAY OF HECKMAN STREET, BEING THE SOUTHWESTERLY CORNER OF LOT
1 THENCE (4) ALONG THE NORTHERLY RIGHT OF WAY OF HECKMAN STREET, SOUTH
FIFTY-THREE DEGREES, TWELVE MINUTES, NO SECONDS WEST (S.53(degree) 12' 00" W) A
DISTANCE OF ONE HUNDRED THIRTY-TWO AND THIRTY-TWO HUNDREDTHS FEET (132.32') TO
THE POINT AND PLACE OF BEGINNING

ALL IN ACCORDANCE WITH A SURVEY PREPARED BY WILLIAM ASSOCIATES, INC., L.S.,
DATED DECEMBER 23, 1996.

<PAGE>

                                    EXHIBIT B

                              BARGAIN AND SALE DEED
<PAGE>

                                    EXHIBIT C

                            NON-FOREIGN CERTIFICATION
                           UNDER INTERNAL REVENUE CODE
                               SECTION 1445(b)(2)

      Section 1445 of the Internal Revenue Code provides that a transferee of a
U.S. real property interest must withhold tax if the transferor is a foreign
person. For U.S. tax purposes (including Section 1445), the owner of a
disregarded entity (which has legal title to a U.S. real property interest under
local law) will be the transferor of the property and not the disregarded
entity. To inform Chemicon Specialty Media, Inc., a Delaware Corporation, and
wholly owned subsidiary of Chemicon International, Inc. (the "Purchaser") that
withholding of tax will not be required upon the disposition of a U.S. real
property interest by Cell & Molecular Technologies, Inc., a Delaware Corporation
(the "Seller"), the undersigned hereby certifies to Purchaser the following:

      1.    The Seller is not a "foreign corporation," "foreign partnership,"
            "foreign trust" or "foreign estate" (as those terms are defined in
            Section 1445 of the Internal Revenue Code and Income Tax
            Regulations);

      2.    The Seller is not a "disregarded entity" as defined in Treasury
            Regulation ss. 1.1445-2(b)(2)(iii);

      3.    The Seller's taxpayer identification number is _____________ ; and

      4.    The Seller's address is ________________________________________.

      The Seller understands that this certification may be disclosed to the
Internal Revenue Service by transferee and that any false statement contained
herein could be punished by fine, imprisonment, or both.

      Under penalties of perjury the undersigned declare that, to the best of
their knowledge and belief, all the information stated in this Certificate is
accurate and complete.

                                           CELL & MOLECULAR TECHNOLOGIES, INC.

                                           By:
                                               ---------------------------------
                                            Name:
                                            Title:

<PAGE>

                                    EXHIBIT D

                         POST CLOSING ADJUSTMENT LETTER
                           ____________________, 2005

Serologicals Corporation
5655 Spalding Drive
Norcross, GA 30092

RE:  Agreement of Sale
     580 Marshall Street
     Lot, Block, Phillipsburg, New Jersey

Gentlemen:

      This document shall serve as a letter agreement with respect to the
closing of title under that certain Agreement of Sale
dated______________________________, 2005 by and between Chemicon Specialty
Media, Inc., a Delaware Corporation, and a wholly owned subsidiary of Chemicon
International, Inc. (the "PURCHASER"), Sentigen Holding Corp., a Delaware
Corporation (the "PARENT") and Cell & Molecular Technologies, Inc., a Delaware
Corporation (the "SELLER") as to the following matters:

      1. It is agreed that all closing adjustments as more fully set forth on
the attached Statement of Closing Title have been computed as of
________________________, 2005.

      2. If any errors or omissions have been made in any closing adjustment, we
will correct the same at the request of either party hereto within one (1) year
from the date of this letter,

      3. Any party responsible to make a payment to the other will do so within
thirty (30) days of receipt of notice that an amount is due together with
adequate supporting data for such amount.

      4. The provisions of this letter agreement with respect to closing
adjustments shall survive the closing of title to the referenced property for a
period of one (1) year.

      Please acknowledge your agreement to the foregoing by countersigning this
letter agreement below in the space provided.

                                            CELL & MOLECULAR TECHNOLOGIES, INC.

                                            By:
                                               --------------------------------
                                             Name:

<PAGE>

Title:

ACCEPTED AND AGREED TO:

CHEMICON SPECIALTY MEDIA, INC.

By:
    -----------------------------
      Name:
      Title:

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