Document:

Exhibit 4.3

                                     FORM OF
                          REGISTRATION RIGHTS AGREEMENT

          This Registration Rights Agreement (this "AGREEMENT") is made and
entered into as of February __, 2000 among Alliance Pharmaceutical Corp., a New
York corporation (the "COMPANY"), and the parties who have executed this
Agreement and whose names appear on Schedule I hereto (each party listed on
Schedule I hereto is sometimes individually referred to herein as a "PURCHASER"
and all such parties are sometimes collectively referred to herein as the
"PURCHASERS").

          This Agreement is made pursuant to the Securities Purchase Agreement,
dated as of the date hereof among the Company and the Purchasers (the "PURCHASE
AGREEMENT"). The Company and the Purchasers hereby agree as follows:

1.        DEFINITIONS

          Capitalized terms used and not otherwise defined herein shall have the
meanings given such terms in the Purchase Agreement. As used in this Agreement,
the following terms shall have the following meanings:

          "ADVICE" has meaning set forth in Section 3(o) hereof.

          "AFFILIATE" means, with respect to any Person, any other Person that
directly or indirectly controls or is controlled by or under common control with
such Person. For the purposes of this definition, "CONTROL," when used with
respect to any Person, means the possession, direct or indirect, of the power to
direct or cause the direction of the management and policies of such Person,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "AFFILIATED," CONTROLLING" and "CONTROLLED" have meanings
correlative to the foregoing.

          "AGGREGATE PRICE" has the meaning set forth in Section 2(b) hereof.

          "BUSINESS DAY" means any day except Saturday, Sunday and any day which
shall be a legal holiday or a day on which banking institutions in the State of
New York generally are authorized or required by law or other government actions
to close.

          "CLOSING DATE" shall mean the Closing Date as defined in the Purchase
Agreement.

          "COMMISSION" means the Securities and Exchange Commission.

          "COMMON STOCK" means the Company's Common Stock, par value $0.01 per
share.

          "DEBENTURES" means the Company's 5% convertible debentures due
February __, 2004 issuable pursuant to the Debenture and the Purchase Agreement,
and under certain conditions a second tranche of 5% convertible debentures due
four years after issuance.

          "EFFECTIVENESS DATE" means the earlier of (i) the 90th day following
the Closing Date, or (ii) the fifth business day after the Company has received
notice (written or oral) from the Commission that the Commission Staff will not
be reviewing the Registration Statement or has no further comments on the
Registration Statement.

          "EFFECTIVENESS PERIOD" has the meaning set forth in Section 2(a)
hereof.

          "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended.

          "EVENT" has the meaning set forth in Section 2(b) hereof.

          "FILING DATE" means as soon as practicable but in no event later than
the 30th day following the Closing Date.

          "HOLDER" or "HOLDERS" means the holder or holders, as the case may be,
from time to time of Registrable Securities.

          "INDEMNIFIED PARTY" has the meaning set forth in Section 5(c) hereof.

          "INDEMNIFYING PARTY" has the meaning set forth in Section 5(c) hereof.

          "INITIAL REGISTRATION STATEMENT" has the meaning set forth in Section
2(a) hereof. "LOSSES" has the meaning set forth in Section 5(a) hereof.

          "NASDAQ" has the meaning set forth in Section 2(b).

          "PERSON" means an individual or a corporation, partnership, trust,
incorporated or unincorporated association, joint venture, limited liability
company, joint stock company, government (or an agency or political subdivision
thereof) or other entity of any kind.

          "PROCEEDING" means an action, claim, suit, investigation or proceeding
(including, without limitation, an investigation or partial proceeding, such as
a deposition), whether commenced or threatened.

          "PROSPECTUS" means the prospectus included in the Registration
Statement (including, without limitation, a prospectus that includes any
information previously omitted from a prospectus filed as part of an effective
registration statement in reliance upon Rule 430A promulgated under the
Securities Act), as amended or supplemented by any prospectus supplement, with
respect to the terms of the offering of any portion of the Registrable
Securities covered by the Registration Statement, and all other amendments and
supplements to the Prospectus, including post-effective amendments, and all
material incorporated by reference in such Prospectus.

          "REGISTRABLE SECURITIES" means the shares of Common Stock issued or
issuable upon (i) conversion of or with respect to $15,000,000 principal amount
of the Debentures, (ii) payment of interest or any other payments in respect of
the Debentures and (iii) any shares of the Company's capital stock issued with
respect to (i) or (ii) as a result of any stock split, stock dividend,
recapitalization, exchange or similar event or otherwise.

          "REGISTRATION DELAY PAYMENT" has the meaning set forth in Section 2(b)
hereof.

          "REGISTRATION STATEMENT" means the Initial Registration Statement and
any additional registration statements contemplated by Sections 2(a), 2(b) and
7(d), including (in each case) the Prospectus, amendments and supplements to
such registration statement or Prospectus, including pre- and post-effective
amendments, all exhibits thereto, and all material incorporated by reference in
such registration statement.

          "RULE 144" means Rule 144 promulgated by the Commission pursuant to
the Securities Act, as such Rule may be amended from time to time, or any
similar rule or regulation hereafter adopted by the Commission having
substantially the same effect as such Rule.

          "RULE 158" means Rule 158 promulgated by the Commission pursuant to
the Securities Act, as such Rule may be amended from time to time, or any
similar rule or regulation hereafter adopted by the Commission having
substantially the same effect as such Rule.

          "RULE 415" means Rule 415 promulgated by the Commission pursuant to
the Securities Act, as such Rule may be amended from time to time, or any
similar rule or regulation hereafter adopted by the Commission having
substantially the same effect as such Rule.

          "SECURITIES ACT" means the Securities Act of 1933, as amended.

          "TRADING DAY" means a day on which Nasdaq (or such other securities
market on which the Common Stock is listed) is open for trading.

          "UNDERLYING SHARES" means the shares of Common Stock issuable upon
conversion of the Debentures.

          "UNDERWRITTEN REGISTRATION OR UNDERWRITTEN OFFERING" means a
registration in connection with which securities of the Company are sold to an
underwriter for reoffering to the public pursuant to an effective registration
statement.

2.        REGISTRATION REQUIREMENTS

          a. FILING AND EFFECTIVENESS OBLIGATIONS. On or prior to the Filing
Date, the Company shall prepare and file with the Commission a Registration
Statement (the "INITIAL REGISTRATION STATEMENT") which shall cover all
Registrable Securities for an offering to be made on a continuous basis pursuant
to a "Shelf" registration statement under Rule 415. The Initial Registration
Statement shall be on Form S-3 or any successor form (except if the Company is
not then eligible to register for resale the Registrable Securities on Form S-3,
in which case such registration shall be on another appropriate form in
accordance herewith, subject to the reasonable consent of the Holders of the
Registrable Securities). The Company shall (i) not permit any securities other
than the Registrable Securities to be included in the Initial Registration
Statement and (ii) use its best efforts to cause the Initial Registration
Statement to be declared effective under the Securities Act as promptly as
possible after the filing thereof, but in any event on or prior to the
Effectiveness Date, and to keep such Initial Registration Statement continuously
effective under the Securities Act until the date which is four years after the
date that such Initial Registration Statement is declared effective by the
Commission or such earlier date when all Registrable Securities covered by such
Initial Registration Statement have been sold or may be sold without volume
restrictions pursuant to Rule 144 as determined by counsel to the Company
pursuant to a written opinion letter, addressed to the Holders and the Company's
transfer agent to such effect (the "EFFECTIVENESS PERIOD"). The number of shares
of Common Stock initially included in the Initial Registration Statement shall
be no less than (a) the number of shares of Common Stock that are then issuable
upon conversion of the Debentures (based on the Conversion Price (as defined in
the Debentures) as would then be in effect at such time), without regard to any
limitation on the Investor's ability to convert the Debentures, and (b) the
number of shares of Common Stock that could be issued as payment of interest on
the Debentures for a one year period. If on the date of an actual adjustment to
the Conversion Price pursuant to Section 4.5 of the Debenture the Registration
Statements are insufficient to register all Underlying Shares (after giving
effect to such adjustment) and the number of shares of Common Stock issuable
upon the payment of interest on the principal amount of the then outstanding
Debentures for a one year period, the Company shall immediately, but in no more
than ten (10) Business Days, file a Registration Statement sufficient to
register such additional shares of Common Stock.;

          b. UNDERWRITTEN OFFERING. In addition to the Initial Registration
Statement, at any time when a Registration Statement covering the Registrable
Securities is not effective (during any period in which a Registration Statement
is required to be effective pursuant to the terms hereof), if the Holders of a
majority of the Registrable Securities covered by a Registration Statement so
elect on or after August __, 2000 an offering of Registrable Securities pursuant
to such Registration Statement may be effected on no more than two (2) occasions
in the form of an Underwritten Offering. In such event, and if the managing
underwriters advise the Company and such Holders in writing that in their
opinion the amount of Registrable Securities proposed to be sold in such
Underwritten Offering exceeds the amount of Registrable Securities which can be
sold in such Underwritten Offering, there shall be included in such Underwritten
Offering the amount of such Registrable Securities which in the opinion of such
managing underwriters can be sold, and such amount shall be allocated PRO RATA
among the Holders proposing to sell Registrable Securities in such Underwritten
Offering.

          c. UNDERWRITER. If any of the Registrable Securities are to be sold in
an Underwritten Offering, the investment banker in interest that will administer
the offering will be selected by the Holders of a majority of the Registrable
Securities included in such offering provided that the Company shall consent to
the inclusion of such investment banker, which consent shall not be unreasonably
withheld. No Holder may participate in any Underwritten Offering hereunder
unless such Holder (i) agrees to sell its Registrable Securities on the basis
provided in any underwriting agreements approved by the Persons entitled
hereunder to approve such arrangements and (ii) completes and executes all
questionnaires, powers of attorney, indemnities, underwriting agreements and
other documents required under the terms of such arrangements.

          d. If (i) any of the Holders desires to sell Underlying Shares and the
Initial Registration Statement covering all the applicable Registrable
Securities required to be filed by the Company pursuant to this Agreement is not
(A) filed with the Commission on or before the Filing Date or (B) declared
effective by the Commission on or before the applicable Effectiveness Date, (ii)
on any day after the Registration Statement has been declared effective by the
Commission any of the Holders desires to sell Underlying Shares and cannot do so
pursuant to Rule 144 and (A) sales of all the Registrable Securities which such
Holders desire to sell cannot be made pursuant to the Registration Statement
(including, without limitation, because of a failure to keep the Registration
Statement effective, to disclose such information as is necessary for sales to
be made pursuant to the Registration Statement, or to register sufficient shares
of Common Stock) or (B) the Common Stock is not listed or included for quotation
on the National Market System of the Nasdaq Stock Market ("NASDAQ"), the Nasdaq
SmallCap Market, the New York Stock Exchange ("NYSE") or the American Stock
Exchange (the "AMEX") after being so listed or included for quotation or (iii)
the Company shall otherwise fail to file a Registration Statement required by
Section 2(a) hereof that is necessary in order to permit sales of Underlying
Shares that Holders desire to sell (each such event specified in (i), (ii) and
(iii) above, an "EVENT"), then, as partial relief for the damages to any Holder
by reason of any such delay in or reduction of its ability to sell the
Registrable Securities (which remedy shall not be exclusive of any other
remedies available at law or in equity), the Company shall pay to each Holder an
amount in cash (a "REGISTRATION DELAY PAYMENT") equal to the portion of the then
outstanding principal amount of the Debentures which the Holders desired to
convert to Common Stock and sell and cannot sell under Rule 144 (and, in the
case of Holders, the principal amount of such Debentures from which such
Registrable Securities were converted) (the "AGGREGATE PRICE") multiplied by two
hundredths (.020) times the sum of: (i) the number of months (prorated for
partial months) after the end of the Effectiveness Date and prior to the date
the Registration Statement is declared effective by the Commission or such
shares can be sold under Rule 144, PROVIDED, HOWEVER, that there shall be
excluded from such period any delays which are solely attributable to changes
required by the Purchasers in the Registration Statement with respect to
information relating to the Purchasers, or to the failure of the Purchasers to
conduct their review of the Registration Statement pursuant to Section 3(a);
(ii) the number of months (prorated for partial months) that sales cannot be
made either pursuant to Rule 144 or the Registration Statement after the
Registration Statement has been declared effective (including, without
limitation, when sales cannot be made by reason of the Company's failure to
properly supplement or amend the Prospectus in accordance with the terms of this
Agreement, or otherwise, but excluding when such sales cannot be made solely by
reason of any act or omission solely attributable to the Purchasers); and (iii)
the number of months (prorated for partial months) that the Common Stock is not
listed or included for quotation on the Nasdaq, NYSE or AMEX or that trading
thereon is halted after the Registration Statement has been declared effective.
The Company shall pay any Required Registration Delay Payments to each Holder in
cash on the last Business Day of each month during which an Event has occurred
and is continuing. In the event the Company fails to make a Registration Delay
Payment within ten (10) Business Days of the date such Registration Delay
Payment is due, such Registration Delay Payment shall bear interest at the rate
of 2.0% per month (prorated for partial months) until paid in full.

          e. The Company represents and warrants that it meets the registrant
eligibility and transaction requirements for the use of Form S-3 (for secondary
offerings) for the registration of the sale of Registrable Securities by the
Purchasers and any other Holders and the Company shall file all reports required
to be filed by the Company with the Commission in a timely manner so as to
maintain such eligibility for the use of Form S-3.

3.        REGISTRATION PROCEDURES

          In connection with the Company's registration obligations hereunder,
the Company shall:

          a. PREPARATION OF REGISTRATION STATEMENT. Prepare and file with the
Commission on or prior to the Filing Date a Registration Statement on Form S-3
or its successor form (or if the Company is not then eligible to register for
resale the Registrable Securities on Form S-3 such registration shall be on
another appropriate form in accordance herewith (which shall include a plan of
distribution reasonably agreed upon by the parties hereto, in the form of
EXHIBIT A annexed hereto, unless in connection with an Underwritten Offering) or
in connection with an Underwritten Offering hereunder, such other form agreed to
by the Company and by a majority-in-interest of Holders of Registrable
Securities to be covered by such Registration Statement) (except if otherwise
directed by the Holders), and cause the Registration Statement to become
effective and remain effective as provided herein; PROVIDED, HOWEVER, that not
less than five (5) Business Days prior to the filing of the Registration
Statement or any related Prospectus or any amendment or supplement thereto
(including any document that would be incorporated therein by reference), the
Company shall, if reasonably practicable (i) furnish to the Holders, their
counsel and any managing underwriters, copies of all such documents proposed to
be filed (including documents incorporated by reference), which documents will
be subject to the review of such Holders, their counsel and such managing
underwriters, and (ii) cause its officers and directors, counsel and independent
certified public accountants to respond to such inquiries as shall be necessary,
in the reasonable opinion of respective counsel to such Holders and such
underwriters, to conduct a reasonable investigation within the meaning of the
Securities Act. The Company shall not file the Registration Statement or any
such Prospectus or any amendments or supplements thereto to which the Holders of
a majority of the Registrable Securities, their counsel or any managing
underwriters shall reasonably object within three (3) Business Days after
receipt of copies of any such documents, and will not request acceleration of
such Registration Statement without prior notice to such counsel. The sections
of such Registration Statement covering information with respect to the Holders,
the Holder's beneficial ownership of securities of the Company or the Holders
intended method of disposition of Registrable Securities shall conform to the
information provided to the Company by each of the Holders.

          b. AMENDMENTS. (i) Prepare and file with the Commission such
amendments, including post-effective amendments, to the Registration Statement
as may be necessary to keep the Registration Statement continuously effective
for the Effectiveness Period and prepare and file with the Commission such
additional Registration Statements in order to register for resale under the
Securities Act all of the Registrable Securities; (ii) cause the related
Prospectus to be amended or supplemented by any required Prospectus supplement,
and as so supplemented or amended to be filed pursuant to Rule 424 (or any
similar provisions then in force) promulgated under the Securities Act; (iii)
respond as promptly as possible to any comments received from the Commission
with respect to the Registration Statement or any amendment thereto and as
promptly as possible provide the Holders true and complete copies of all
correspondence from and to the Commission relating to the Registration
Statement; and (iv) comply in all material respects with the provisions of the
Securities Act and the Exchange Act with respect to the disposition of all
Registrable Securities covered by the Registration Statement during the
applicable period in accordance with the intended methods of disposition by the
Holders thereof set forth in the Registration Statement as so amended or in such
Prospectus as so supplemented. In the event the number of shares available under
a Registration Statement filed pursuant to this Agreement is insufficient to
cover the number of the Registrable Securities required by Section 2(a) hereof,
the Company shall amend the Registration Statement, or file a new Registration
Statement (on the short form available therefore, if applicable), or both, so as
to cover such number of the Registrable Securities, in each case, as soon as
practicable, but in any event within ten (10) Business Days after the necessity
therefor arises (based on the Conversion Price of the Debentures and other
relevant factors on which the Company reasonably elects to rely). The Company
shall use its best efforts to cause such amendment and/or new Registration
Statement to become effective as soon as practicable following the filing
thereof. The provisions of Section 2(b) above shall be applicable with respect
to such obligation, with the ninety (90) days running from the day after the
date on which the Company reasonably first determines (or reasonably should have
determined) the need therefor.

          c. NOTIFICATIONS. Notify the Holders of Registrable Securities to be
sold, their counsel and any managing underwriters as promptly as possible (and,
in the case of (i)(A) below, not less than five (5) days prior to such filing
and, in the case of (i)(C) below, not later than the first Business Day after
effectiveness) and (if requested by any such Person) confirm such notice in
writing no later than one (1) Business Day following the day (i)(A) when a
Prospectus or any Prospectus supplement or post-effective amendment to the
Registration Statement is proposed to be filed; (B) when the Commission notifies
the Company whether there will be a "review" of such Registration Statement and
whenever the Commission comments in writing on such Registration Statement and
(C) with respect to the Registration Statement or any post-effective amendment,
when the same has become effective; (ii) of any request by the Commission or any
other Federal or state governmental authority for amendments or supplements to
the Registration Statement or Prospectus or for additional information; (iii) of
the issuance by the Commission of any stop order suspending the effectiveness of
the Registration Statement covering any or all of the Registrable Securities or
the initiation of any Proceedings for that purpose; (iv) if at any time any of
the representations and warranties of the Company contained in any agreement
(including any underwriting agreement) contemplated hereby ceases to be true and
correct in all material respects; (v) of the receipt by the Company of any
notification with respect to the suspension of the qualification or exemption
from qualification of any of the Registrable Securities for sale in any
jurisdiction, or the initiation or threatening of any Proceeding for such
purpose; and (vi) of the occurrence of any event that makes any statement made
in the Registration Statement or Prospectus or any document incorporated or
deemed to be incorporated therein by reference untrue in any material respect or
that requires any revisions to the Registration Statement, Prospectus or other
documents so that, in the case of the Registration Statement or the Prospectus,
as the case may be, it will not contain any untrue statement of a material fact
or omit to state any material fact required to be stated therein or necessary to
make the statements therein, in light of the circumstances under which they were
made, not misleading.

          d. SUSPENSIONS. Use its best efforts to avoid the issuance of, or, if
issued, obtain the withdrawal of (i) any order suspending the effectiveness of
the Registration Statement or (ii) any suspension of the qualification (or
exemption from qualification) of any of the Registrable Securities for sale in
any jurisdiction, at the earliest practicable moment.

          e. SUPPLEMENTS AND POST-EFFECTIVE AMENDMENTS. If requested by any
managing underwriter or the Holders of a majority in interest of the Registrable
Securities to be sold in connection with an Underwritten Offering, (i) promptly
incorporate in a Prospectus supplement or post-effective amendment to the
Registration Statement such information as the Company reasonably agrees should
be included therein and (ii) make all required filings of such Prospectus
supplement or such post-effective amendment as soon as practicable after the
Company has received notification of the matters to be incorporated in such
Prospectus supplement or post-effective amendment; PROVIDED, HOWEVER, that the
Company shall not be required to take any action pursuant to this Section 3(e)
that would, in the opinion of counsel, reasonably acceptable to the purchasers,
for the Company, violate applicable law.

          f. COPIES OF REGISTRATION STATEMENT. Furnish to each Holder, their
counsel, and any managing underwriters, without charge, at least one conformed
copy of each Registration Statement and each amendment thereto, including
financial statements and schedules, all documents incorporated or deemed to be
incorporated therein by reference, and all exhibits to the extent requested by
such Person (including those previously furnished or incorporated by reference)
promptly after the filing of such documents with the Commission.

          g. COPIES OF PROSPECTUS. Promptly deliver to each Holder, their
counsel, and any underwriters, without charge, as many copies of the Prospectus
or Prospectuses (including each form of prospectus) and each amendment or
supplement thereto as such Persons may reasonably request; and the Company
hereby consents to the use of such Prospectus and each amendment or supplement
thereto by each of the selling Holders and any underwriters in connection with
the offering and sale of the Registrable Securities covered by such Prospectus
and any amendment or supplement thereto.

          h. BLUE SKY. Prior to any public offering of Registrable Securities,
use its best efforts to register or qualify or cooperate with the selling
Holders, any underwriters and their counsel in connection with the registration
or qualification (or exemption from such registration or qualification) of such
Registrable Securities for offer and sale under the securities or Blue Sky laws
of such jurisdictions within the United States as any Holder or underwriter
requests in writing, to keep each such registration or qualification (or
exemption therefrom) effective during the Effectiveness Period and to do any and
all other acts or things necessary or advisable to enable the disposition in
such jurisdictions of the Registrable Securities covered by a Registration
Statement; PROVIDED, HOWEVER, that the Company shall not be required to qualify
generally to do business in any jurisdiction where it is not then so qualified
or to take any action that would subject it to general service of process in any
such jurisdiction where it is not then so subject or subject the Company to any
material tax in any such jurisdiction where it is not then so subject.

          i. CERTIFICATES. Cooperate with the Holders and any managing
underwriters to facilitate the timely preparation and delivery of certificates
representing Registrable Securities to be sold pursuant to a Registration
Statement, which certificates shall be free, to the extent permitted by
applicable law and the Purchase Agreement, of all restrictive legends, and to
enable such Registrable Securities to be in such denominations and registered in
such names as any such managing underwriters or Holders may request at least two
(2) Business Days prior to any sale of Registrable Securities.

          j. SUPPLEMENTS AND AMENDMENTS. Upon the occurrence of any event
contemplated by Section 3(c)(vi), as promptly as possible, prepare a supplement
or amendment, including a post-effective amendment, to the Registration
Statement or a supplement to the related Prospectus or any document incorporated
or deemed to be incorporated therein by reference, and file any other required
document so that, as thereafter delivered, neither the Registration Statement
nor such Prospectus will contain an untrue statement of a material fact or omit
to state a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading.

          k. LISTING. Use its best efforts to cause all Registrable Securities
relating to such Registration Statement to be listed on Nasdaq and any other
securities exchange, quotation system, market or over-the-counter bulletin
board, if any, on which similar securities issued by the Company are then listed
as and when required pursuant to the Purchase Agreement.

          l. UNDERWRITING AGREEMENT. Enter into such agreements (including an
underwriting agreement in form, scope and substance as is customary in
Underwritten Offerings) and take all such other actions in connection therewith
(including those reasonably requested by any managing underwriters and the
Holders of a majority of the Registrable Securities being sold) in order to
expedite or facilitate the disposition of such Registrable Securities, and
whether or not an underwriting agreement is entered into, (i) make such
representations and warranties to such Holders and such underwriters as are
customarily made by issuers to underwriters in underwritten public offerings,
and confirm the same if and when requested; (ii) in the case of an Underwritten
Offering obtain and deliver copies thereof to the managing underwriters, if any,
or in the case of non-Underwritten Offerings, if reasonably requested by the
selling Holders, obtain and deliver copies thereof to such selling Holders, of
opinions of counsel to the Company and updates thereof addressed to each such
underwriter, in form, scope and substance reasonably satisfactory to any such
managing underwriters and counsel to the selling Holders covering the matters
customarily covered in opinions requested in Underwritten Offerings and such
other matters as may be reasonably requested by such counsel and underwriters;
(iii) immediately prior to the effectiveness of the Registration Statement, and,
in the case of an Underwritten Offering, at the time of delivery of any
Registrable Securities sold pursuant thereto, and, in the case of
non-Underwritten Offerings, at such time as the selling Holders may reasonably
request, obtain and deliver copies to the Holders and the managing underwriters,
if any, of "cold comfort" letters and updates thereof from the independent
certified public accountants of the Company (and, if required, any other
independent certified public accountants of any subsidiary of the Company or of
any business acquired by the Company for which financial statements and
financial data is, or is required to be, included in the Registration
Statement), addressed to each of the underwriters, if any, in form and substance
as are customary in connection with Underwritten Offerings; (iv) if an
underwriting agreement is entered into, the same shall contain indemnification
provisions and procedures no less favorable to the selling Holders and the
underwriters, if any, than those set forth in Section 5 (or such other
provisions and procedures acceptable to the managing underwriters, if any, and
holders of a majority of Registrable Securities participating in such
Underwritten Offering; and (v) deliver such documents and certificates as may be
reasonably requested by the Holders of a majority of the Registrable Securities
being sold, their counsel and any managing underwriters to evidence the
continued validity of the representations and warranties made pursuant to clause
3(1)(i) above and to evidence compliance with any customary conditions contained
in the underwriting agreement or other agreement entered into by the Company.

          m. DUE DILIGENCE. Make available for inspection by the selling
Holders, any representative of such Holders, any underwriter participating in
any disposition of Registrable Securities, and any attorney or accountant
retained by such selling Holders or underwriters, at the offices where normally
kept, during reasonable business hours, all financial and other records,
pertinent corporate documents and properties of the Company and its
subsidiaries, and cause the officers, directors, agents and employees of the
Company and its subsidiaries to supply all information in each case reasonably
requested by any such Holder, representative, underwriter, attorney or
accountant in connection with the Registration Statement; PROVIDED, HOWEVER,
that if any information is determined in good faith by the Company in writing to
be of a confidential nature at the time of delivery of such information, then
prior to delivery of such information, the Company and the Holders shall enter
into a confidentiality agreement reasonably acceptable to the Company and the
Holders providing that such information shall be kept confidential, unless (i)
disclosure of such information is required by court or administrative order or
is necessary to respond to inquiries of regulatory authorities (PROVIDED,
HOWEVER, that the Company shall be given notice of any such pending disclosure
so that the Company may seek a protective order); (ii) disclosure of such
information, in the opinion of counsel to such Person, is required by law; (iii)
such information becomes generally available to the public other than as a
result of a disclosure or failure to safeguard by such Person; or (iv) such
information becomes available to such Person from a source other than the
Company and such source is not known by such Person to be bound by a
confidentiality agreement with the Company.

          n. EARNINGS STATEMENT. Comply in all material respects with all
applicable rules and regulations of the Commission and make generally available
to its securityholders earning statements satisfying the provisions of Section
11(a) of the Securities Act and Rule 158 not later than 45 days after the end of
any 12-month period (or 90 days after the end of any 12-month period if such
period is a fiscal year) (i) commencing at the end of any fiscal quarter in
which Registrable Securities are sold to underwriters in a firm commitment or
best efforts Underwritten Offering and (ii) if not sold to underwriters in such
an offering, commencing on the first day of the first fiscal quarter of the
Company after the effective date of the Registration Statement, which statement
shall conform to the requirements of Rule 158.

          o. INFORMATION. The Company may require each selling Holder to furnish
to the Company information regarding such Holder and the distribution of such
Registrable Securities as is required by law to be disclosed in the Registration
Statement, and the Company may exclude from such registration the Registrable
Securities of any such Holder who unreasonably fails to furnish such information
within a reasonable time after receiving such request.

          The Company shall hold in confidence and not make any disclosure of
information concerning a Holder provided to the Company unless (i) disclosure of
such confidential information is necessary to comply with federal or state
securities laws, (ii) the disclosure of such confidential information is
necessary to avoid or correct a misstatement or omission in any Registration
Statement, (iii) the release of such confidential information is ordered
pursuant to a subpoena or other order from a court or governmental body of
competent jurisdiction, or (iv) such confidential information has been made
generally available to the public other than by disclosure in violation of this
or any other agreement. The Company agrees that it shall, if possible, upon
learning that disclosure of such information concerning a Holder is sought in or
by a court or governmental body of competent jurisdiction or through other
means, give prompt notice to such Holder prior to making such disclosure, and
allow the Holder, at its expense, to undertake appropriate action to prevent
disclosure of, or to obtain a protective order for, such information.

          If the Registration Statement refers to any Holder by name or
otherwise as the holder of any securities of the Company, then such Holder shall
have the right to require (if such reference to such Holder by name or otherwise
is not required by the Securities Act or any similar Federal statute then in
force) the deletion of the reference to such Holder in any amendment or
supplement to the Registration Statement filed or prepared subsequent to the
time that such reference ceases to be required.

          Each Holder covenants and agrees that (i) it will not sell any
Registrable Securities under the Registration Statement until it has received
copies of the Prospectus as then amended or supplemented as contemplated in
Section 3(g) and notice from the Company that such Registration Statement and
any post-effective amendments thereto have become effective as contemplated by
Section 3(c) and (ii) it and its officers, directors or Affiliates, if any, will
comply with the prospectus delivery requirements of the Securities Act as
applicable to them in connection with sales of Registrable Securities pursuant
to the Registration Statement.

          Each Holder agrees by its acquisition of such Registrable Securities
that, upon receipt of a notice from the Company of the occurrence of any event
of the kind described in Section 3(c)(ii), 3(c)(iii), 3(c)(iv), 3(c)(v) or
3(c)(vi), such Holder will forthwith discontinue disposition of such Registrable
Securities under the Registration Statement until such Holder's receipt of the
copies of the supplemented Prospectus and/or amended Registration Statement
contemplated by Section 3(j), or until it is advised in writing (the "ADVICE")
by the Company that the use of the applicable Prospectus may be resumed, and, in
either case, has received copies of any additional or supplemental filings that
are incorporated or deemed to be incorporated by reference in such Prospectus or
Registration Statement. Notwithstanding anything to the contrary, the Company
shall cause its transfer agent to deliver unlegended shares of Common Stock to a
transferee of a Holder in accordance with the terms of the Securities Purchase
Agreement in connection with any sale of Registrable Securities with respect to
which an Holder has entered into a binding contract for sale prior to the
Holder's receipt of a notice from the Company of the happening of any event of
the kind described in Section 3(c)(ii), 3(c)(iii), 3(c)(iv), 3(c)(v) or 3(c)(vi)
and for which the Holder has not yet settled.

          p. RESPONSES TO THE COMMISSION. The Company agrees to respond fully
and completely, in the Company's best judgement, to any and all comments on a
Registration Statement received from the Commission staff as promptly as
possible but, for non-Underwritten Offerings, in no event later than ten (10)
Business Days of the receipt of such comments, regardless of whether such
comments are in oral or written form.

          q. CONFIRMATION OF EFFECTIVENESS. Within two (2) Business Days after a
Registration Statement which covers applicable Registrable Securities is ordered
effective by the Commission, the Company shall deliver, and shall cause legal
counsel for the Company to deliver, to the transfer agent for such Registrable
Securities (with copies to the Holders whose Registrable Securities are included
in such Registration Statement) confirmation that such Registration Statement
has been declared effective by the Commission in the form attached hereto as
EXHIBIT B.

4.        REGISTRATION EXPENSES

          a. All fees and expenses incident to the performance of or compliance
with this Agreement by the Company shall be borne by the Company, whether or not
pursuant to an Underwritten Offering and whether or not the Registration
Statement is filed or becomes effective and whether or not any Registrable
Securities are sold pursuant to the Registration Statement. The fees and
expenses referred to in the foregoing sentence shall include, without limitation
(and except as provided herein), (i) all registration and filing fees
(including, without limitation, fees and expenses (A) with respect to filings
required to be made with Nasdaq and each other securities exchange or market on
which Registrable Securities are required hereunder to be listed and (B) in
compliance with state securities or Blue Sky laws (including, without
limitation, fees and disbursements of counsel for the Holders in connection with
Blue Sky qualifications of the Registrable Securities and determination of the
eligibility of the Registrable Securities for investment under the laws of such
jurisdictions as the managing underwriters, if any, or the Holders of a majority
of Registrable Securities may designate), (ii) printing expenses (including,
without limitation, expenses of printing certificates for Registrable Securities
and of printing prospectuses if the printing of prospectuses is requested by the
managing underwriters, if any, or by the holders of a majority of the
Registrable Securities included in the Registration Statement), (iii) messenger,
telephone and delivery expenses, (iv) fees and disbursements of counsel for the
Company and counsel for the Holders, (v) Securities Act liability insurance, if
the Company so desires such insurance, and (vi) fees and expenses of all other
Persons retained by the Company in connection with the consummation of the
transactions contemplated by this Agreement. In addition, the Company shall be
responsible for all of its internal expenses incurred in connection with the
consummation of the transactions contemplated by this Agreement (including,
without limitation, all salaries and expenses of its officers and employees
performing legal or accounting duties), the expense of any annual audit, and the
fees and expenses incurred in connection with the listing of the Registrable
Securities on any securities exchange as required hereunder.

          b. If the Holders require an Underwritten Offering pursuant to the
terms hereof, the Company shall be responsible for all reasonable costs, fees
and expenses in connection therewith, except for the fees and disbursements of
the Underwriters (including any underwriting commissions and discounts) and
their legal counsel and accountants (which shall be borne by the Holders).
Therefore, in such circumstances the Holder shall bear the expenses of the fees
and disbursements of any legal counsel or accounting firm retained by the
underwriters in connection with such Underwritten Offering and the costs of any
determination (but not filing) by the underwriters of the eligibility of the
Registrable Securities for investment under the applicable state securities
laws. By way of illustration which is not intended to diminish from the
provisions of Section 4(a), the Holders shall not be responsible for, and the
Company shall be required to pay the fees or disbursements incurred by the
Company (including by its legal counsel and accountants) in connection with, the
preparation and filing of a Registration Statement and related Prospectus for
such offering, the maintenance of such Registration Statement in accordance with
the terms hereof, the listing of the Registrable Securities in accordance with
the requirements hereof, and printing expenses incurred to comply with the
requirements hereof.

5.        INDEMNIFICATION

          a. INDEMNIFICATION BY THE COMPANY. The Company shall, notwithstanding
any termination of this Agreement, indemnify and hold harmless each Holder, the
officers, directors, agents (including any underwriters retained by such Holder
in connection with the offer and sale of Registrable Securities), brokers
(including brokers who offer and sell Registrable Securities as principal as a
result of a pledge or any failure to perform under a margin call of Common
Stock), investment advisors and employees of each of them, each Person who
controls any such Holder (within the meaning of Section 15 of the Securities Act
or Section 20 of the Exchange Act) and the officers, directors, agents and
employees of each such controlling Person, to the fullest extent permitted by
applicable law, from and against any and all joint or several losses, claims,
damages, liabilities, costs (including, without limitation, costs of preparation
and attorneys' fees) and expenses (collectively, together with actions,
proceedings or inquiries by any regulatory or self-regulatory organization,
whether commenced or threatened, "LOSSES"), as incurred, arising out of or
relating to (i) any untrue or alleged untrue statement of a material fact
contained in the Registration Statement, any Prospectus or any form of
prospectus or in any amendment or supplement thereto or in any preliminary
Prospectus, or arising out of or relating to any omission or alleged omission of
a material fact required to be stated therein or necessary to make the
statements therein (in the case of any Prospectus or form of prospectus or
supplement thereto, in light of the circumstances under which they were made)
not misleading (in the case of any Prospectus or form of prospectus or
supplement thereto, in light of the circumstances under which they were made),
except to the extent, but only to the extent, that such untrue statements or
omissions are based solely upon information regarding such Holder furnished in
writing to the Company by such Holder expressly for use therein, which
information was reasonably relied on by the Company for use therein or to the
extent that such information relates to such Holder or such Holder's proposed
method of distribution of Registrable Securities and was reviewed and expressly
approved in writing by such Holder expressly for use in the Registration
Statement, such Prospectus or such form of prospectus or in any amendment or
supplement thereto (provided that the Company amended any disclosure with
respect to the method of distribution upon written notice from the Holders that
such section of the Prospectus should be revised in any way) or (ii) any
violation or alleged violation by the Company of the Securities Act, the
Exchange Act, any other law, including, without limitation, any state securities
law, or any rule or regulation thereunder relating to the offer or sale of
Registrable Securities. The Company shall not, however, be liable for any Losses
to any Holder with respect to any untrue or alleged untrue statement of material
fact or omission or alleged omission of material fact if such statement or
omission was made in a preliminary Prospectus and such Holder did not receive a
copy of the final Prospectus (or any amendment or supplement thereto) at or
prior to the confirmation of the sale of the Registrable Securities in any case
where such delivery is required by the Securities Act and the untrue or alleged
untrue statement of material fact or omission or alleged omission of material
fact contained in such preliminary Prospectus was corrected in the final
Prospectus (or any amendment or supplement thereto), unless the failure to
deliver such final Prospectus (as amended or supplemented) was a result of
noncompliance by the Company with Section 3(g) of this Agreement. The Company
shall notify the Holders promptly of the institution, threat or assertion of any
Proceeding of which the Company is aware in connection with the transactions
contemplated by this Agreement.

          b. INDEMNIFICATION BY HOLDERS. Each Holder shall, severally and not
jointly, indemnify and hold harmless the Company, the directors, officers,
agents and employees, each Person who controls the Company (within the meaning
of Section 15 of the Securities Act and Section 20 of the Exchange Act), and the
directors, officers, agents or employees of such controlling Persons, to the
fullest extent permitted by applicable law, from and against all Losses, as
incurred, arising solely out of or based solely upon any untrue statement of a
material fact contained in the Registration Statement, any Prospectus, or any
form of prospectus, or arising solely out of or based solely upon any omission
of a material fact required to be stated therein or necessary to make the
statements therein not misleading to the extent, but only to the extent, that
such untrue statement or omission is contained in any information so furnished
in writing by such Holder to the Company specifically for inclusion in the
Registration Statement or such Prospectus and that such information was
reasonably relied upon by the Company for use in the Registration Statement,
such Prospectus or such form of prospectus or to the extent that such
information relates to such Holder or such Holder's proposed method of
distribution of Registrable Securities and was reviewed and expressly approved
in writing by such Holder expressly for use in the Registration Statement, such
Prospectus or such form of prospectus; PROVIDED, HOWEVER, that the indemnity
agreement contained in this Section 5(b) shall not apply to amounts paid in
settlement of any Losses if such settlement is effected without the prior
written consent of such Holder, which consent shall not be unreasonably
withheld. In no event shall the liability of any selling Holder hereunder be
greater in amount than the dollar amount of the net proceeds received by such
Holder upon the sale of the Registrable Securities giving rise to such
indemnification obligation.

          c. CONDUCT OF INDEMNIFICATION PROCEEDINGS. If any Proceeding shall be
brought or asserted against any Person entitled to indemnity hereunder (an
"INDEMNIFIED PARTY"), such Indemnified Party promptly shall notify the Person
from whom indemnity is sought (the "INDEMNIFYING PARTY") in writing, and the
Indemnifying Party shall assume the defense thereof, including the employment of
counsel reasonably satisfactory to the Indemnified Party and the payment of all
fees and expenses incurred in connection with defense thereof; PROVIDED,
HOWEVER, that the failure of any Indemnified Party to give such notice shall not
relieve the Indemnifying Party of its obligations or liabilities pursuant to
this Agreement, except (and only) to the extent that it shall be finally
determined by a court of competent jurisdiction (which determination is not
subject to appeal or further review) that such failure shall have proximately
and materially adversely prejudiced the Indemnifying Party.

          An Indemnified Party shall have the right to employ separate counsel
in any such Proceeding and to participate in the defense thereof, but the fees
and expenses of such counsel shall be at the expense of such Indemnified Party
or Parties unless: (1) the Indemnifying Party has agreed in writing to pay such
fees and expenses; or (2) the Indemnifying Party shall have failed promptly to
assume the defense of such Proceeding and to employ counsel reasonably
satisfactory to such Indemnified Party in any such Proceeding; or (3) the named
parties to any such Proceeding (including any impleaded parties) include both
such Indemnified Party and the Indemnifying Party, and such Indemnified Party
shall have been advised by counsel that a conflict of interest is likely to
exist if the same counsel were to represent such Indemnified Party and the
Indemnifying Party (in which case, if such Indemnified Party notifies the
Indemnifying Party in writing that it elects to employ separate counsel at the
expense of the Indemnifying Party, the Indemnifying Party shall not have the
right to assume the defense thereof and such counsel shall be at the expense of
the Indemnifying Party). The Indemnifying Party shall not be liable for any
settlement of any such Proceeding effected without its written consent, which
consent shall not be unreasonably withheld. No Indemnifying Party shall, without
the prior written consent of the Indemnified Party, effect any settlement of any
pending Proceeding in respect of which any Indemnified Party is a party, unless
such settlement includes an unconditional release of such Indemnified Party from
all liability on claims that are the subject matter of such Proceeding.

          All fees and expenses of the Indemnified Party (including reasonable
fees and expenses to the extent incurred in connection with investigating or
preparing to defend such Proceeding in a manner not inconsistent with this
Section) shall be paid to the Indemnified Party, as incurred, within ten (10)
Business Days of written notice thereof to the Indemnifying Party, which notice
shall be delivered no more frequently than on a monthly basis (regardless of
whether it is ultimately determined that an Indemnified Party is not entitled to
indemnification hereunder; provided, that the Indemnifying Party may require
such Indemnified Party to undertake to reimburse all such fees and expenses to
the extent it is finally judicially determined that such Indemnified Party is
not entitled to indemnification hereunder).

          d. CONTRIBUTION. If a claim for indemnification under Section 5(a) or
5(b) is unavailable to an Indemnified Party because of a failure or refusal of a
court of competent jurisdiction to enforce such indemnification in accordance
with its terms (by reason of public policy or otherwise), then each Indemnifying
Party, in lieu of indemnifying such Indemnified Party, shall contribute to the
amount paid or payable by such Indemnified Party as a result of such Losses, in
such proportion as is appropriate to reflect the relative fault of the
Indemnifying Party and Indemnified Party in connection with the actions,
statements or omissions that resulted in such Losses as well as any other
relevant equitable considerations. The relative fault of such Indemnifying Party
and Indemnified Party shall be determined by reference to, among other things,
whether any action in question, including any untrue or alleged untrue statement
of a material fact or omission or alleged omission of a material fact, has been
taken or made by, or relates to information supplied by, such Indemnifying Party
or Indemnified Party, and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such action, statement or
omission. The amount paid or payable by a party as a result of any Losses shall
be deemed to include, subject to the limitations set forth in Section 5(c), any
reasonable attorneys' or other reasonable fees or expenses incurred by such
party in connection with any Proceeding to the extent such party would have been
indemnified for such fees or expenses if the indemnification provided for in
this Section was available to such party in accordance with its terms. In no
event shall any selling Holder be required to contribute an amount under this
Section 5(d) in excess of the net proceeds received by such Holder upon sale of
the Registrable Securities pursuant to the Registration Statement giving rise to
such contribution obligation.

          The parties hereto agree that it would not be just and equitable if
contribution pursuant to this Section 5(d) were determined by pro rata
allocation or by any other method of allocation that does not take into account
the equitable considerations referred to in the immediately preceding paragraph.
No Person guilty of fraudulent misrepresentation (within the meaning of Section
11(f) of the Securities Act) shall be entitled to contribution from any Person
who was not guilty of such fraudulent misrepresentation.

          The indemnity and contribution agreements contained in this Section
are in addition to any liability that the Indemnifying Parties may have to the
Indemnified Parties.

6.        RULE 144

          As long as any Holder owns Registrable Securities, the Company
covenants to timely file (or obtain extensions in respect thereof and file
within the applicable grace period) all reports required to be filed by the
Company after the date hereof pursuant to Section 13(a) or l5(d) of the Exchange
Act and to promptly furnish the Holders with true and complete copies of all
such filings. As long as any Holder owns Registrable Securities, if the Company
is not required to file reports pursuant to Section 13(a) or l5(d) of the
Exchange Act, it will prepare and furnish to the Holders and make publicly
available in accordance with Rule 144(c) promulgated under the Securities Act
annual and quarterly financial statements, together with a discussion and
analysis of such financial statements in form and substance substantially
similar to those that would otherwise be required to be included in reports
required by Section 13(a) or 15(d) of the Exchange Act, as well as any other
information required thereby, in the time period that such filings would have
been required to have been made under the Exchange Act. The Company further
covenants that it will take such further action as any Holder may reasonably
request, all to the extent required from time to time to enable such Person to
sell Underlying Shares without registration under the Securities Act within the
limitation of the exemptions provided by Rule 144 promulgated under the
Securities Act, including providing any legal opinions referred to in the
Purchase Agreement. Upon the request of any Holder, the Company shall deliver to
such Holder a written certification of a duly authorized officer as to whether
it has complied with such requirements.

7.        MISCELLANEOUS

          a. REMEDIES. In the event of a breach by the Company or by a Holder of
any of their obligations under this Agreement, each Holder or the Company, as
the case may be, in addition to being entitled to exercise all rights granted by
law and under this Agreement, including recovery of damages, will be entitled to
specific performance of its rights under this Agreement. The Company and each
Holder agree that monetary damages would not provide adequate compensation for
any losses incurred by reason of a breach by it of any of the provisions of this
Agreement and hereby further agrees that, in the event of any action for
specific performance in respect of such breach, it shall waive the defense that
a remedy at law would be adequate.

          b. NO INCONSISTENT AGREEMENTS. Neither the Company nor any of its
subsidiaries has, as of the date hereof, nor shall the Company or any of its
subsidiaries, on or after the date of this Agreement, enter into any agreement
with respect to its securities that is inconsistent with the rights granted to
the Holders in this Agreement or otherwise conflicts with the provisions hereof.
Except as disclosed in Schedule 2.1(r) of the Purchase Agreement, neither the
Company nor any of its subsidiaries has previously entered into any agreement
granting any registration rights with respect to any of its securities to any
Person. Without limiting the generality of the foregoing, without the written
consent of the Holders of a majority of the then outstanding Registrable
Securities, the Company shall not grant to any Person the right to request the
Company to register any securities of the Company under the Securities Act
unless the rights so granted are subordinated in all respects to the rights in
full of the Holders set forth in Section 2 herein, and are not otherwise in
conflict or inconsistent with the provisions of this Agreement; notwithstanding
the foregoing, the Company may grant pari passu rights to a Strategic Partner
(as defined in the Debenture). This Agreement, together with the Purchase
Agreement, contain the entire understanding of the parties with respect to the
subject matter hereof and supersede all prior agreements and understandings,
oral or written, with respect to such matters.

          c. NO PIGGYBACK ON REGISTRATIONS. Except as disclosed on Schedule
2.1(r) of the Purchase Agreement, neither the Company nor any of its
securityholders (other than the Holders in such capacity pursuant hereto) may
include securities of the Company in the Registration Statements and the Company
shall not after the date hereof enter into any agreement providing such right to
any of its securityholders, unless the right so granted is subordinated in all
respects to the rights in full of the Holders set forth herein, and is not
otherwise in conflict or inconsistent with the provisions of this Agreement;
notwithstanding the foregoing, the Company may grant pari passu rights to a
Strategic Partner (as defined in the Debenture).

          d. PIGGY-BACK REGISTRATIONS. Except as provided herein if, at any time
when there is not an effective Registration Statement covering the Registrable
Securities, the Company shall determine to prepare and file with the Commission
a registration statement relating to an offering for its own account or the
account of others under the Securities Act of any of its equity securities,
other than on Form S-4 or Form S-8 (each as promulgated under the Securities
Act) or their then equivalents relating to equity securities to be issued solely
in connection with any acquisition of any entity or business or equity
securities issuable in connection with stock option or other employee benefit
plans, the Company shall send to each Holder of Registrable Securities written
notice of such determination and, if within fifteen (15) days after receipt of
such notice, any such Holder shall so request in writing, (which request shall
specify the Registrable Securities intended to be disposed of by the Holders),
the Company will use reasonable efforts to effect the registration under the
Securities Act of all Registrable Securities which the Company has been so
requested to register by the Holder, to the extent requisite to permit the
disposition of the Registrable Securities so to be registered; PROVIDED, that if
at any time after giving written notice of its intention to register any
securities and prior to the effective date of the registration statement filed
in connection with such registration, the Company shall determine for any reason
not to register or to delay registration of such securities, the Company may, at
its election, give written notice of such determination to such Holder and,
thereupon, (i) in the case of a determination not to register, shall be relieved
of its obligation to register any Registrable Securities in connection with such
registration (but not from its obligation to pay expenses in accordance with
Section 4 hereof), and (ii) in the case of a determination to delay registering,
shall be permitted to delay registering any Registrable Securities being
registered pursuant to this Section 7(d) for the same period as the delay in
registering such other securities. The Company shall include in such
registration statement all or any part of such Registrable Securities such
Holder requests to be registered; PROVIDED, HOWEVER, that the Company shall not
be required to register any Registrable Securities pursuant to this Section 7(d)
that are eligible for sale pursuant to Rule 144(k) of the Securities Act. In the
case of an underwritten public offering, if the managing underwriter(s) or
underwriter(s) should reasonably object to the inclusion of the Registrable
Securities in such registration statement, then if the Company after
consultation with the Underwriter's representative should reasonably determine
that the inclusion of such Registrable Securities would materially adversely
affect the offering contemplated in such registration statement, and based on
such determination recommends inclusion in such registration statement of fewer
Registrable Securities then proposed to be sold by the Holders, then (x) the
number of Registrable Securities of the Holders included in such registration
statement shall be reduced pro rata among such Holders (based upon the number of
Registrable Securities requested to be included in the registration) or (y) none
of the Registrable Securities of the Holders shall be included in such
registration statement if the Company, after consultation with the
underwriter(s), recommends the inclusion of none of such Registrable Securities;
PROVIDED, HOWEVER, that if securities are being offered for the account of other
persons or entities as well as the Company, such reduction shall not represent a
greater fraction of the number of Registrable Securities intended to be offered
by the Holders than the fraction of similar reductions imposed on such other
persons or entities (other than the Company). Notwithstanding the foregoing, the
Company shall not file any registration statement under the Securities Act
(other than on Form S-4 or Form S-8) relating to the offer and sale of any
equity securities of the Company, or offer or sell any equity securities of the
Company in a transaction exempt from registration pursuant to Regulation S under
the Securities Act, if the Per Share Market Value is twelve dollars ($12.00) or
less, until the earlier of (i) such time as the Initial Registration Statement
has been effective for a period of sixty (60) Trading Days, which period shall
be tolled if and during the period the effectiveness of the Initial Registration
Statement is suspended for any reason whatsoever or (ii) all of the Registrable
Securities covered therein shall have been sold; provided, further, that in the
case of warrants or other securities which the Company has issued with
piggy-back registration rights, as set forth on Schedule 2.1(r) to the
Securities Purchase Agreement, the Company shall be allowed to file a separate
registration statement during the same time period as the Initial Registration
Statement and/or any Registration Statement being filed pursuant to this
sentence.

          e. AMENDMENTS AND WAIVERS. The provisions of this Agreement, including
the provisions of this sentence, may not be amended, modified or supplemented,
and waivers or consents to departures from the provisions hereof may not be
given, unless the same shall be in writing and signed by the Company and the
Holders of at least two thirds of the then outstanding Registrable Securities;
PROVIDED, HOWEVER, that for the purposes of this sentence, Registrable
Securities that are owned, directly or indirectly, by the Company, or an
Affiliate of the Company are not deemed outstanding. Notwithstanding the
foregoing, a waiver or consent to depart from the provisions hereof with respect
to a matter that relates exclusively to the rights of Holders and that does not
directly or indirectly affect the rights of other Holders may be given by
Holders of at least a majority of the Registrable Securities to which such
waiver or consent relates; PROVIDED, HOWEVER, that the provisions of this
sentence may not be amended, modified, or supplemented except in accordance with
the provisions of the immediately preceding sentence.

          f. NOTICES. Any notice or other communication required or permitted to
be given hereunder shall be in writing and shall be deemed to have been received
(a) upon hand delivery (receipt acknowledged) or delivery by telex (with correct
answer back received), telecopy or facsimile (with transmission confirmation
report) at the address or number designated below (if received by 8:00 p.m. EST
where such notice is to be received), or the first Business Day following such
delivery (if received after 8:00 p.m. EST where such notice is to be received)
or (b) on the second Business Day following the date of mailing by express
courier service, fully prepaid, addressed to such address, or upon actual
receipt of such mailing, whichever shall first occur. The addresses for such
communications are (i) if to the Company to Alliance Pharmaceutical Corp., 6175
Lusk Boulevard, San Diego, California 92121, Attention: President, facsimile
number: (858) 410-5343 with a copy to Stroock & Stroock & Lavan LLP, 180 Maiden
Lane, New York, New York 10038, Attention: Melvin Epstein, facsimile number:
(212) 896-6006 and (ii) if to any Purchaser to the address set forth on Schedule
I hereto with copies to those specified on the signature pages hereto and to
Akin, Gump, Strauss, Hauer & Feld, L.L.P., 590 Madison Avenue, New York, New
York 10022, Attn: James Kaye, Esq., fax no. (212) 872-1002 or such other address
as may be designated in writing hereafter, in the same manner, by such Person.

          g. SUCCESSORS AND ASSIGNS. This Agreement shall inure to the benefit
of and be binding upon the successors and permitted assigns of each of the
parties and shall inure to the benefit of each Holder. The Company may not
assign its rights or obligations hereunder without the prior written consent of
each Holder, which will not be unreasonably withheld. Each Holder may assign its
rights hereunder in the manner and to the Persons as permitted under the
Purchase Agreement. In addition, the rights of each Holder hereunder, including
the right to have the Company register for resale Registrable Securities in
accordance with the terms of this Agreement, shall be automatically assignable
by each Holder if: (i) the Holder agrees in writing with the transferee or
assignee to assign such rights, and a copy of such agreement is furnished to the
Company within a reasonable time after such assignment, (ii) the Company is,
within a reasonable time after such transfer or assignment, furnished with
written notice of (a) the name and address of such transferee or assignee, and
(b) the securities with respect to which such registration rights are being
transferred or assigned, (iii) following such transfer or assignment the further
disposition of such securities by the transferee or assignees is restricted
under the Securities Act and applicable state securities laws, (iv) at or before
the time the Company receives the written notice contemplated by clause (ii) of
this Section, the transferee or assignee agrees in writing with the Company to
be bound by all of the provisions of this Agreement, and (v) such transfer shall
have been made in accordance with the applicable requirements of the Purchase
Agreement. The rights to assignment shall apply to the Holders (and to
subsequent) successors and assigns.

          h. COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which when so executed shall be deemed to be an original
and all of which taken together shall constitute one and the same Agreement. In
the event that any signature is delivered by facsimile transmission, such
signature shall create a valid and binding obligation of the party executing (or
on whose behalf such signature is executed) the same with the same force and
effect as if such facsimile signature were the original thereof.

          i. GOVERNING LAW. The corporate laws of the State of New York shall
govern all issues concerning the relative rights of the Company and the
Purchasers as its stockholders. All other questions concerning the construction,
validity, enforcement and interpretation of this Agreement shall be governed by
and construed in accordance with the laws of the State of New York, without
regard to principles of conflicts of law. Each party hereby irrevocably submits
to the exclusive jurisdiction of the state and federal courts sitting in the
City of New York, Borough of Manhattan, for the adjudication of any dispute
hereunder or in connection herewith or with any transaction contemplated hereby
or discussed herein, and hereby irrevocably waives, and agrees not to assert in
any suit, action or proceeding, any claim that it is not personally subject to
the jurisdiction of any such court, that such suit, action or proceeding is
improper. Each party hereby irrevocably waives personal service of process and
consent to process being served in any such suit, action or proceeding by
mailing a copy thereof to such party at the address for such notices to it under
this Agreement and agrees that such service shall constitute good and sufficient
service of process and notice thereof. Nothing contained herein shall be deemed
to limit in any way any right to serve process in any manner permitted by law.

          j. CUMULATIVE REMEDIES. The remedies provided herein are cumulative
and not exclusive of any remedies provided by law.

          k. SEVERABILITY. If any term, provision, covenant or restriction of
this Agreement is held by a court of competent jurisdiction to be invalid,
illegal, void or unenforceable, the remainder of the terms, provisions,
covenants and restrictions set forth herein shall remain in full force and
effect and shall in no way be affected, impaired or invalidated, and the parties
hereto shall use their reasonable efforts to find and employ an alternative
means to achieve the same or substantially the same result as that contemplated
by such term, provision, covenant or restriction. It is hereby stipulated and
declared to be the intention of the parties that they would have executed the
remaining terms, provisions, covenants and restrictions without including any of
such that may be hereafter declared invalid, illegal, void or unenforceable.

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

          m. SHARES HELD BY THE COMPANY AND ITS AFFILIATES. Whenever the consent
or approval of Holders of a specified percentage of Registrable Securities is
required hereunder, Registrable Securities held by the Company or its Affiliates
(other than any Holder or transferees or successors or assigns thereof if such
Holder is deemed to be an Affiliate solely by reason of its holdings of such
Registrable Securities) shall not be counted in determining whether such consent
or approval was given by the Holders of such required percentage.

                  [Remainder of Page Intentionally Left Blank]

<PAGE>

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

                                       ALLIANCE PHARMACEUTICAL CORP.

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

                                       PURCHASERS

                                       ------------------------------

<PAGE>

                                   SCHEDULE I

COMPANY

ALLIANCE PHARMACEUTICAL CORP.
6175 Lusk Boulevard
San Diego, California 92121
Attention:  President
Facsimile: (858) 410-5343

PURCHASERS:

<PAGE>

                                                                   EXHIBIT A

                              PLAN OF DISTRIBUTION

          The Company is registering the Registrable Securities on behalf of the
Holder. As used herein, the term Holder means the holder of the Registrable
Securities and includes donees and pledgees selling Registrable Securities
received from a named Holder after the date of this Prospectus. All costs,
expenses and fees in connection with the registration of the Registrable
Securities offered hereby will be borne by the Company. Brokerage commissions
and similar selling expenses, if any, attributable to the sale of Registrable
Securities will be borne by the Holders. Sales of Registrable Securities may be
effected by Holders from time to time in one or more types of transactions
(which may include block transactions) on the Nasdaq National Market, in the
over-the-counter market, in negotiated transactions, through put or call options
transactions relating to the Registrable Securities, through short sales of
Registrable Securities, or a combination of such methods of sale, at market
prices prevailing at the time of sale, or at negotiated prices. Such
transactions may or may not involve brokers or dealers. The Holders have advised
the Company that they have not entered into any agreements, understandings or
arrangements with any underwriters or broker-dealers regarding the sale of their
securities, nor is there an underwriter or coordinated broker acting in
connection with the proposed sale of Registrable Securities by the Holders.

          The Holders may enter into hedging transactions with broker-dealers or
other financial institutions. In connection with such transactions,
broker-dealers or other financial institutions may engage in short sales of the
Registrable Securities or of securities convertible into or exchangeable for the
Registrable Securities in the course of hedging positions they assume with
Holders. The Holders may also enter into options or other transactions with
broker-dealers or other financial institutions which require the delivery to
such broker-dealers or other financial institutions of Registrable Securities
offered by this Prospectus, which Registrable Securities such broker-dealer or
other financial institution may resell pursuant to this Prospectus (as amended
or supplemented to reflect such transaction).

          The Holders may effect such transactions by selling Registrable
Securities directly to purchasers or to or through broker-dealers, which may act
as agents or principals. Such broker-dealers may receive compensation in the
form of discounts, concessions or commissions from Holders and/or the purchasers
of Registrable Securities for whom such broker-dealers may act as agents or to
whom they sell as principal, or both (which compensation as to a particular
broker-dealer might be in excess of customary commissions).

          The Holders and any broker-dealers that act in connection with the
sale of Registrable Securities might be deemed to be "underwriters" within the
meaning of Section 2(11) of the Securities Act, and any commissions received by
such broker-dealers any profit on the resale of the Registrable Securities sold
by them while acting as principals might be deemed to be underwriting discounts
or commissions under the Securities Act. The Company has agreed to indemnify
each Holder against certain liabilities, including liabilities arising under the
Securities Act. The Holders may agree to indemnify any agent, dealer or
broker-dealer that participates in transactions involving sales of the
Registrable Securities against certain liabilities, including liabilities
arising under the Securities Act.

          The Holders may be deemed to be "underwriters" within the meaning of
Section 2(11) of the Securities Act.

          The Holders will be subject to the prospectus delivery requirements of
the Securities Act. The Company has informed the Holders that the
anti-manipulative provisions of Regulation M promulgated under the Exchange Act
may apply to their sales in the market.

          Holders also may resell all or a portion of the Registrable Securities
in open market transactions in reliance upon Rule 144 under the Securities Act,
provided they meet the criteria and conform to the requirements of such Rule.

          Upon the Company being notified by a Holder that any material
arrangement has been entered into with a broker-dealer for the sale of
Registrable Securities through a block trade, special offering, exchange
distribution or secondary distribution or a purchase by a broker or dealer, a
supplement to this Prospectus will be filed, if required, pursuant to Rule
424(b) under the Securities Act, disclosing (i) the name of each such Holder and
of the participating broker-dealer(s), (ii) the number of Registrable Securities
involved, (iii) the initial price at which such Registrable Securities were
sold, (iv) the commissions paid or discounts or concessions allowed to such
broker-dealer(s), where applicable, (v) that such broker-dealer(s) did not
conduct any investigation to verify the information set out or incorporated by
reference in this Prospectus and (vi) other facts material to the transactions.
In addition, upon the Company being notified by a Holder that a donee or pledgee
intends to sell more than 500 Registrable Securities, a supplement to this
Prospectus will be filed.

<PAGE>

                                                                     EXHIBIT B

                         FORM OF NOTICE OF EFFECTIVENESS
                            OF REGISTRATION STATEMENT

[TRANSFER AGENT]
Attn.:

                  Re:      Alliance Pharmaceutical Corp.

Ladies and Gentlemen:

          We are counsel to Alliance Pharmaceutical Corp., a New York
corporation (the "Company"), and have represented the Company in connection with
that certain Securities Purchase Agreement (the "Purchase Agreement") entered
into by and among the Company and the buyers named therein (collectively, the
"Holders") pursuant to which the Company issued to the Holders its 5%
convertible debentures due February __, 2004 (the "Debentures") convertible into
shares of the Company's common stock, par value $0.01 per share (the "Common
Stock"). Pursuant to the Purchase Agreement, the Company also has entered into a
Registration Rights Agreement with the Holders (the "Registration Rights
Agreement") pursuant to which the Company agreed, among other things, to
register the Registrable Securities (as defined in the Registration Rights
Agreement), including the shares of Common Stock issuable upon conversion of the
Debentures, under the Securities Act of 1933, as amended (the "1933 Act"). In
connection with the Company's obligations under the Registration Rights
Agreement, on _______________, 1999, the Company filed a Registration Statement
on Form S-3 (File No. 333-_____________) (the "Registration Statement") with the
Securities and Exchange Commission (the "SEC") relating to the Registrable
Securities which names each of the Holders as a selling stockholder thereunder.

          In connection with the foregoing, we advise you that a member of the
SEC's staff has advised us by telephone that the SEC has entered an order
declaring the Registration Statement effective under the 1933 Act at [ENTER TIME
OF EFFECTIVENESS] on [ENTER DATE OF EFFECTIVENESS] and we have no knowledge,
after telephonic inquiry of a member of the SEC's staff, that any stop order
suspending its effectiveness has been issued or that any proceedings for that
purpose are pending before, or threatened by, the SEC and the Registrable
Securities are available for resale under the 1933 Act pursuant to the
Registration Statement.

                                                        Very truly yours,
                                                        [ISSUER'S COUNSEL]

CC:      [LIST NAMES OF HOLDERS]<PAGE>
                                                                     EXHIBIT 4.3

Warrant No. __

                                Right to purchase
                                 _______ shares

                               PartsBase.com, Inc.

                        Warrant to purchase Common Stock

     THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY
STATE. THE SECURITIES HAVE BEEN ACQUIRED FOR INVESTMENT AND MAY NOT BE SOLD,
OFFERED FOR SALE OR TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION
UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND ANY APPLICABLE STATE
SECURITIES LAWS OR AN OPINION OF COUNSEL SATISFACTORY IN FORM AND SUBSTANCE TO
COUNSEL FOR THE CORPORATION THAT THE TRANSACTION SHALL NOT RESULT IN A VIOLATION
OF STATE OR FEDERAL SECURITIES LAWS.

Registered Owner: Gunn Allen Financial, Inc.

     For value received, PartsBase.com, Inc., a Texas corporation (the
"Corporation"), grants the following rights to the registered owner of this
Warrant:

     (a) ISSUE. Upon tender to the Corporation (as defined in paragraph (e)
hereof), the Corporation shall issue to the registered owner hereof the number
of shares specified in paragraph (b) hereof of fully paid and nonassessable
shares of Common Stock of the Corporation that the registered owner is otherwise
entitled to purchase.

     (b) NUMBER OF SHARES. The number of shares of Common Stock of the
Corporation that the registered owner of this Warrant is entitled to receive
upon exercise of this Warrant is ______ shares. The Corporation shall at all
times reserve and hold available sufficient shares of Common Stock to satisfy
all conversion and purchase rights represented by outstanding convertible
securities, options and warrants, including this Warrant. The corporation
covenants and agrees that all shares of Common Stock that may be issued upon
the exercise of this Warrant shall, upon issuance, be duly and validly
issued, fully paid and nonassessable, and free from all taxes, liens and
charges with respect to the purchase and the issuance of the shares.

     (c) EXERCISE PRICE. The exercise price of this Warrant, the price at which
the shares of stock purchasable upon exercise of this Warrant may be purchased,
is Two Dollars ($2.00) per share.

                                              1
<PAGE>

     (d) EXERCISE PERIOD. This Warrant may only be exercised on or after
September 1, 1999, and on or before September 1, 2002 ("Exercise Period"). If
not exercised during this period, this Warrant and all rights granted under this
Warrant shall expire and lapse.

     (e) TENDER. The exercise of this Warrant must be accomplished by actual
delivery of the Exercise Price in cash, certified check, or official bank draft
in lawful money of the United States of America, and by actual delivery of a
duly executed form, a copy of which is attached to this Warrant as Exhibit "1,"
properly executed by the registered owner of this Warrant, and by surrender of
this Warrant. The payment and exercise form must be delivered, personally or by
mail, to the offices of the Corporation at 7171 N. Federal Highway, Boca Raton,
Florida 33487. Documents sent by mail shall be deemed to be delivered when they
are received by the Corporation.

     (f) CASHLESS TENDER. The registered owner in its sole and absolute
discretion may exercise this warrant without tender of the exercise price. The
registered owner shall receive the number of shares determined by (1)
subtracting the cumulative exercise price from cumulative fair market value of
the shares for which the warrant is exercised and (2) dividing the amount
determined in (1) by the fair market value of a share on the date of exercise.

     For these purposes, the fair market value of a share of stock in the event
that the stock is traded on the NASDAQ National Market System, is equal to the
mean between the bid and asked quotation for the Common Stock as to any date (as
reported by a recognized stock quotation service) or, in the event that there
shall be no bid or asked quotations as to a date, then upon the basis of the
mean between the bid and asked quotations on the date nearest preceding that
date. If the stock is listed and traded upon a recognized securities exchange,
the fair market value shall be based upon the reported closing price at which
such shares were traded on such recognized exchange as to any date or, if the
stock was not traded on said date, upon the basis of the closing price on the
date nearest preceding that date. If the stock is neither (i) traded on the Over
the Counter market or (ii) listed on a recognized Securities Exchange, the fair
market value shall be based on the value of the stock as of that date according
to an independent appraiser.

     (g) RECOGNITION OF REGISTERED OWNER. Prior to due presentment for
registration of transfer of this Warrant, the Corporation may deem and treat the
registered owner or owners for all purposes, as the person or persons
exclusively entitled to receive notices concerning this Warrant, and as the
person or persons otherwise entitled to exercise rights under this Warrant.

     Except as otherwise provided herein, this Warrant and all rights under it
are transferable by the registered owner or owners in person or by duly
authorized attorneys on the books of the Corporation upon the surrender of this
Warrant to the Corporation with the transfer or assignment form, a copy of which
is attached to this Warrant as Exhibit "2," properly completed and executed. The
transfer or assignment form and this Warrant must

                                       2
<PAGE>

be delivered, personally or by mail, to the offices of the Corporation at 7171
N. Federal Highway, Boca Raton, Florida 33487.

     (h) NOTICE TO REGISTERED WARRANT HOLDERS. Any and all notices given to the
owner or owners of this Warrant must be given by first class mail, postage
prepaid, addressed to the registered owner or owners of this Warrant at the
address or addresses of the owner or owners appearing in the records of the
Corporation. No notice or notices to the owner or owners of this Warrant are
required except as specified in this Warrant.

     (i) RESTRICTED STOCK; REGISTRATION. The shares of Common Stock of the
Corporation (or the shares into which the Common Stock has been changed or
converted) purchased upon exercise of this Warrant ("Restricted Stock") or
purchasable upon exercise of this Warrant ("Underlying Stock") shall not be
transferable except upon the conditions stated below, which are intended to
insure compliance with federal and state securities laws. The certificates
representing these shares of stock, unless the same are registered prior to
exercise of this Warrant, shall be stamped or otherwise imprinted with a legend
in substantially the following form:

     "The securities represented by this Certificate have not been registered
     under the Securities Act of 1933, as amended, or the securities laws of any
     state. The securities have been acquired for investment and may not be
     sold, offered for sale or transferred in the absence of an effective
     registration under the Securities Act of 1933, as amended, and any
     applicable state securities laws or an opinion of counsel satisfactory in
     form and substance to counsel for the Corporation that the transaction
     shall not result in a violation of state or federal securities laws."

     (j) LIMITED RIGHTS. This Warrant does not entitle the record owner of this
Warrant to any voting rights, to any other rights of a stockholder of the
Corporation, or to any other rights whatsoever, except for the rights that are
expressed as rights and set forth in this Warrant. No dividends are or shall be
payable, or shall accrue, on or with respect to this Warrant or any interest
represented by this Warrant or on the shares purchasable upon exercise hereof
until or unless, and except to the extent that, this Warrant is exercised.

     (k) EFFECT OF STOCK CHANGES. If, at any time or from time to time the
Corporation, by stock dividend, stock split, subdivision, reverse split,
consolidation, reclassification of shares, or otherwise, changes as a whole its
outstanding Common Stock into a different number or class of shares, then,
immediately upon the occurrence of the change,

     (1)  the class of shares into which the Common Stock has been changed shall
          replace the Common Stock, for the purposes of this Warrant and the
          terms and conditions hereof, so that the registered owner or owners of
          this Warrant shall be entitled to receive, and shall receive upon
          exercise of this Warrant, shares of the class of stock into which the
          Common Stock had been changed;

                                       3
<PAGE>

     (2)  the number of shares purchasable upon exercise of this Warrant shall
          be proportionately adjusted (for example, if the outstanding Common
          Stock of the Corporation is converted into X stock at the rate of
          (one) 1 share of Common Stock into (three) 3 shares of X stock, and
          prior to the change the registered owner or owners of this Warrant
          were entitled, upon exercise of this Warrant, to purchase one hundred
          shares of Common Stock, then the registered owner or owners shall,
          after the change, be entitled to purchase three hundred shares of X
          stock for the total same exercise price that the owner or owners had
          to pay prior to the change to purchase the one hundred shares of
          Common Stock); and

     (3)  the purchase price per share shall be proportionately adjusted. (In
          the above example, the purchase price per share would be reduced by
          one-third.)

     Irrespective of any adjustment or change in the number or class of shares
purchasable under this or any other Warrant or like tenor, or in the purchase
price per share, this Warrant, as well as any other warrant of like tenor, may
continue to express the purchase price per share and the number and class of
shares purchasable upon exercise of this Warrant as the purchase price per share
and the number and class of shares purchasable were expressed in this Warrant
when it was initially issued.

     (l) EFFECT OF MERGER. If at any time while this Warrant is outstanding
another corporation merges into the Corporation, the registered owner or owners
of this Warrant shall be entitled, immediately after the merger becomes
effective and upon exercise of this Warrant, to obtain the same number of shares
of Common Stock of the Corporation (or shares into which the Common Stock has
been changed as provided in the paragraph of this Warrant covering changes) that
the owner or owners were entitled upon the exercise hereof to obtain immediately
before the merger became effective at the same exercise price. The Corporation
shall take any and all steps necessary in connection with the merger to assure
that sufficient shares of Common Stock to satisfy all conversion and purchase
rights represented by outstanding convertible securities, options and warrants,
including this Warrant, are available so that these convertible securities,
options and warrants, including this Warrant, may be exercised.

     (m) EFFECT OF CONSOLIDATION OR SALE. Notwithstanding any provision of this
Warrant concerning the callability of this Warrant, if the Corporation
consolidates with or merges into another corporation or other entity in a
transaction in which the Corporation is not the surviving corporation, or
receives an offer to purchase or lease all or substantially all of the assets of
the Corporation or an offer to purchase fifty percent (50%) or more of the
issued and outstanding Common Stock of the Corporation, or if all or
substantially all of the assets of Company are sold or leased or fifty percent
(50%) or more of the issued and outstanding Common Stock of the Corporation is
purchased by any person or group of persons acting in concert, then this Warrant
shall be called by the Corporation. The right to exercise this

                                       4
<PAGE>

Warrant shall terminate when it is called. The call price shall be determined by
the board of directors of the Corporation, but shall not be less than the
greater of the median value of the shares of Common Stock purchasable upon
exercise of this Warrant in the market in which the shares are principally
traded at the time the event triggering the call occurs, or the value of the
securities or the other consideration that shall be received in the transaction
by the owner of a number of outstanding shares of Common Stock equal to the
number of shares purchasable upon exercise of this Warrant. This call price
shall be payable to the registered owner or owners of this Warrant upon its
surrender for cancellation at the offices of the Corporation, together with the
transfer or assignment form which forms a part hereof, duly completed and
executed in blank.

     (n) DISSOLUTION. In the event that a voluntary or involuntary dissolution,
liquidation or winding up of the Corporation (other than in connection with a
merger where the Corporation is the surviving corporation as covered in this
Warrant, or a merger or consolidation with or into another corporation, a sale
or lease of all or substantially all of the assets of the Corporation, or a sale
of a specified portion or percentage or its stock as covered in this Warrant) is
at any time proposed during the term of this Warrant, the Corporation shall give
written notice to the registered owner or owners of this Warrant at least thirty
(30) days prior to the record date of the proposed transaction. The notice must
contain: (1) the date on which the transaction is to take place; (2) the record
date (which must be at least thirty (30) days after the giving of the notice) as
of which holders of the Common Stock entitled to receive distributions as a
result of the transaction shall be determined; (3) a brief description of the
transaction; (4) a brief description of the distributions, if any, to be made to
holders of the Common Stock as a result of the transaction; and (5) an estimate
of the fair market value of the distributions. On the date of the transaction,
if it actually occurs, this Warrant and all rights existing under this Warrant
shall terminate.

     (o) NOTICE OF ADJUSTMENT. On the happening of an event requiring an
alteration or adjustment of the shares purchasable upon exercise of this
Warrant, or an alteration or adjustment of their number or designation, the
Corporation shall give written notice to the registered owner or owners of this
Warrant stating the adjusted number, designation and kind of securities or other
property obtainable upon exercise of this Warrant as a result of and following
the event. The notice shall set forth in reasonable detail the method of
calculation determining the securities or property obtainable after the event,
and the facts upon which the calculation is based. The Corporation's board of
directors, acting in good faith, shall determine the calculation.

     (p) CHANGE OF ADDRESSES. Either party may change the address at which it is
to receive notices and written correspondence by providing written notice to the
other party of such change of address.

                                       5
<PAGE>

        IN WITNESS WHEREOF, the Corporation has signed this Warrant by its duly
authorized officers this _______ day of ___________, 2000.

                                            PartsBase.com, Inc.

                                            By:
                                               -----------------------------
                                                   Robert A. Hammond,
                                                   President

                                       6

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