Document:

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                                                                     EXHIBIT 4.4

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED WITH THE SECURITIES
AND EXCHANGE COMMISSION IN RELIANCE UPON AN EXEMPTION FROM REGISTRATION UNDER
THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), AND, ACCORDINGLY, MAY NOT BE
OFFERED OR SOLD EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE
ACT OR PURSUANT TO AN AVAILABLE EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT
TO, THE REGISTRATION REQUIREMENTS OF THE ACT.

                                                               Right to Purchase
                                                                  500,901 Shares
                                                                of Common Stock,
                                                                par value $0.001
                                                                       per share

                                GERON CORPORATION
                         AMENDED AND RESTATED SERIES D-2
                             STOCK PURCHASE WARRANT

Registered Owner:

      This warrant is a duly authorized warrant (the "Warrant") of Geron
Corporation, a Delaware corporation (the "Company") referred to in the
Securities Purchase Agreement (the "Purchase Agreement"), dated as of June 29,
2000, by and between the Company and the Purchaser (as defined in the Purchase
Agreement) and as amended by that certain Restructuring Agreement (the
"Restructuring Agreement"), dated as of November 9, 2001, by and between the
Company and the Purchaser. This Warrant is subject to the terms and conditions
of the Purchase Agreement and the Restructuring Agreement, copies of which are
on file at and may be obtained from the Company at its principal office at the
address set forth in Section 11 hereof. This certifies that, for value received
the Company grants the following rights to the Registered Owner, or assigns, of
this Warrant:

      1. ISSUE. Upon tender (as defined in section 5 hereof) to the Company, the
Company shall issue to the Registered Owner, RGC International Investors, LDC,
or assigns, up to the number of shares specified in paragraph 2 hereof of fully
paid and non-assessable shares of Common Stock, par value $.001 per share
("Common Stock"), that the Registered Owner, or assigns, is otherwise entitled
to purchase.

      2. NUMBER OF SHARES. The total number of shares of Common Stock that the
Registered Owner, or assigns, of this Warrant is entitled to receive upon
exercise of this Warrant is 500,901 shares of Common Stock, subject to
adjustment from time to time as set forth in paragraph 6 below. The Company
shall at all times have authorized, reserved and held available sufficient
shares of Common Stock to satisfy all conversion and purchase rights represented
by outstanding convertible securities, options and warrants, including this
Warrant, for issuance upon exercise of this Warrant, such number of shares equal
to 125% of the shares for which it may then be exercised. The Company 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
non-assessable, and free from all taxes, liens and charges with respect to the
purchase and the issuance of the shares.
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      3. EXERCISE PRICE. The initial exercise price of this Warrant, the price
at which the shares of stock issuable upon exercise of this Warrant may be
purchased, is $25.00 and subject to adjustment from time to time pursuant to the
provisions of paragraph 6 below (the "Exercise Price").

      3A.   PAYMENT OF EXERCISE PRICE.  The Registered Owner may pay the
Exercise Price in one of the following manners:

(i)   Cash Exercise.  The Registered Owner shall deliver immediately
available funds or a check payable to the Company; or

(ii) Cashless Exercise. At such time as, but only at such time as, after the
120th day after the date of issuance of this Warrant, all of the Registerable
Securities (as defined in the Registration Rights Agreement) are not registered
pursuant to an effective registration statement, the Registered Owner shall have
the right to surrender this Warrant to the Company together with a notice of
cashless exercise, in which event the Company shall issue to the Registered
Owner the number of Warrant Shares determined as follows:

      where:            X = Y (A-B)/A

                        X = the number of Warrant Shares (as defined in the
                        Restructuring Agreement) to be issued to the Registered
                        Owner

                        Y = the number of Warrant Shares with respect to which
                        this Warrant is being exercised

                        A = the average of the Per Share Market Value of the
                        Common Stock for the five (5) Trading Days immediately
                        prior to (but not including) the date of exercise

                        B = the Exercise Price

For purposes of Rule 144 promulgated under the Securities Act, it is intended,
understood and acknowledged that the Warrant Shares issued in a cashless
exercise transaction shall be deemed to have been acquired by the Registered
Owner, and the holding period for the Warrant Shares shall be deemed to have
been commenced, on the issue date to the extent permitted by Rule 144.

      4. EXERCISE PERIOD. This Warrant may be exercised at any time and from
time to time on or after the date on which this Warrant is issued and delivered
(the "Issue Date") and before 5:00, New York City time on December 31, 2006 (the
"Exercise Period"). If not exercised during this period, this Warrant and all
rights granted under this Warrant shall expire and lapse.

      5. TENDER. This Warrant may be exercised, in whole or in part, by actual
delivery of (i) the Exercise Price in cash, (ii) a duly executed Warrant
Exercise Form, a copy of which is attached to this Warrant as Exhibit A,
properly executed by the Registered Owner, or assigns, of this Warrant, and
(iii) by surrender of this Warrant. The payment and Warrant Exercise Form must
be

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delivered, personally or by mail, to the registered office of the Company.
Documents sent by mail shall be deemed to be delivered when they are received by
the Company. If this Warrant shall have been exercised only in part, then,
unless this Warrant has expired, the Company shall, at its expense, at the time
of delivery of such certificates, deliver to the holder a new Warrant
representing the number of shares with respect to which this Warrant shall not
then have been exercised.

      6. Adjustment of Exercise Price.

            (a) Common Stock Dividends; Common Stock Splits; Reverse Common
Stock Splits. If the Company, at any time while this Warrant is outstanding, (a)
shall pay a stock dividend on its Common Stock, (b) subdivide outstanding shares
of Common Stock into a larger number of shares, (c) combine outstanding shares
of Common Stock into a smaller number of shares, or (d) issue by
reclassification of shares of Common Stock any shares of capital stock of the
Company, the Exercise Price shall be multiplied by a fraction the numerator of
which shall be the number of shares of Common Stock (excluding treasury shares,
if any) outstanding before such event and the denominator of which shall be the
number of shares of Common Stock outstanding after such event. Any adjustment
made pursuant to this paragraph (6)(a) shall become effective immediately after
the record date for the determination of shareholders entitled to receive such
dividend or distribution and shall become effective immediately after the
effective date in the case of a subdivision, combination or re-classification.

            (b) [Intentionally Omitted.]

            (c) [Intentionally Omitted.]

            (d) Rounding. All calculations under this section 6 shall be made to
the nearest cent or the nearest l/l00th of a share, as the case may be.

            (e) Notice of Adjustment. Whenever the Exercise Price is adjusted
pursuant to paragraph 6(a), the Company shall promptly mail to the holder of the
Warrant, a notice setting forth the Exercise Price after such adjustment and
setting forth a brief statement of the facts requiring such adjustment. Upon
each adjustment of the Exercise Price pursuant paragraph 6(a), the number of
shares of Common Stock issuable upon exercise of this Warrant shall be adjusted
by multiplying a number equal to the Exercise Price in effect immediately prior
to such adjustment by the number of shares of Common Stock issuable upon
exercise of this Warrant immediately prior to such adjustment and dividing the
product so obtained by the adjusted Exercise Price.

            (f) Redemption Events. In case of (A) any reclassification of the
Common Stock, (B) any consolidation or merger of the Company with or into
another person pursuant to which (i) a majority of the Company's Board of
Directors will not constitute a majority of the board of directors of the
surviving entity or (ii) less than 51% of the outstanding shares of the capital
stock of the surviving entity will be held by the same shareholders of the
Company prior to such reclassification, consolidation or merger, (C) the sale or
transfer of all or substantially all of the assets of the Company, (D) any
compulsory share exchange pursuant to which the Common Stock is converted into
other securities, cash or property, (E) suspension from listing or delisting of
the Common Stock from the National Market System of the Nasdaq Stock Market
("Nasdaq") or any other exchange on which the Common Stock is listed for a
period of five (5) consecutive Trading

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Days, (F) the Company's notice to any Registered Owner, including by way of
public announcement, at any time, of its intention, for any reason, not to
comply with proper requests for the exercise of any such warrants, or (G) a
breach by the Company of any representation, warranty, covenant or other term or
condition of the Purchase Agreement, the Registration Rights Agreement or any
other agreement, document, certificate or other instrument delivered in
connection with the transactions contemplated thereby or hereby, except to the
extent that such breach would not have a Material Adverse Effect (as defined in
Section 3(a) of the Purchase Agreement) and except, in the case of a breach of a
covenant which is curable, only if such breach continues for a period of at
least ten (10) days after the Company knows or reasonably should have known of
the existence of such breach (clauses (A) through (G) above referred to as a
"Redemption Event"), the holder of the Warrant shall have the right thereafter
to exercise the Warrant within ten (10) Business Days of the Redemption Event
for the shares of stock and other securities, cash and property receivable upon
or deemed to be held by holders of Common Stock following such Redemption Event,
and the holder of the Warrant shall be entitled upon such event to receive such
amount of securities, cash or property as the shares of the Common Stock of the
Company into which the Warrant could have been converted immediately prior to
such Redemption Event would have been entitled.

            (g) Reclassification, Etc. If:

                  A. the Company shall declare a dividend (or any other
      distribution) on its Common Stock; or

                  B. the Company shall declare a special nonrecurring cash
      dividend on or a redemption of its Common Stock; or

                  C. the Company shall authorize the granting to all of the
      holders of the Common Stock rights or warrants to subscribe for or
      purchase any shares of capital stock of any class or of any rights; or

                  D. the approval of any shareholders of the Company shall be
      required in connection with any reclassification of the Common Stock of
      the Company, any consolidation or merger to which the Company is a party,
      any sale or transfer of all or substantially all of the assets of the
      Company, of any compulsory share exchange whereby the Common Stock is
      converted into other securities, cash or property; or

                  E. the Company shall authorize the voluntary or involuntary
      dissolution, liquidation or winding up of the affairs of the Company;

then the Company shall cause to be filed at each office or agency maintained for
the purpose of exercise of this Warrant, and shall cause to be mailed to the
holder of this Warrant at its address as it shall appear below, at least thirty
(30) calendar days prior to the applicable record or effective date hereinafter
specified, a notice (provided such notice shall not include any material
non-public information) stating (x) the date on which a record is to be taken
for the purpose of such dividend, distribution, redemption, rights or warrants,
or if a record is not to betaken, the date as of which the holders of Common
Stock of record to be entitled to such dividend, distributions, redemption,
rights or warrants are to be determined or (y) the date on which such
reclassification, consolidation, merger, sale, transfer or share exchange is
expected to become effective or close, and the date as of

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which it is expected that holders of Common Stock of record shall be entitled to
exchange their shares of Common Stock for securities, cash or other property
deliverable upon such reclassification, consolidation, merger, sale, transfer or
share exchange; provided, however, that the failure to mail such notice or any
defect therein or in the mailing thereof shall not affect the validity of the
corporate action required to be specified in such notice.

            (h) [Intentionally Omitted.]

      In no event shall any provision in this Section 6 cause the Exercise Price
to be greater than the Exercise Price on the date of issuance of this Warrant.

      7. RESTRICTION ON EXERCISE BY THE REGISTERED OWNER. Notwithstanding
anything in this Warrant to the contrary, in no event shall the Holder of this
Warrant be entitled to exercise a number of Warrants (or portions thereof) in
excess of the number of Warrants (or portions thereof) upon exercise of which
the sum of (i) the number of shares of Common Stock beneficially owned by the
Holder and its affiliates (other than shares of Common Stock which may be deemed
beneficially owned through the ownership of the unexercised Warrants and the
unexercised or unconverted portion of any other securities of the Company
(including the Amended Series D Debentures (as defined in the Restructuring
Agreement)) and the Company's Series D-1 Stock Purchase Warrant issued to RGC)
subject to a limitation on conversion or exercise analogous to the limitation
contained herein) and (ii) the number of shares of Common Stock issuable upon
exercise of the Warrants (or portions thereof) with respect to which the
determination described herein is being made, would result in beneficial
ownership by the Holder and its affiliates of more than 9.9% of the outstanding
shares of Common Stock. For purposes of the immediately preceding sentence,
beneficial ownership shall be determined in accordance with Section 13(d) of the
Securities Exchange Act of 1934, as amended, and Regulation 13D-G thereunder,
except as otherwise provided in clause (i) hereof. Notwithstanding anything in
this Warrant to the contrary, the restriction on Holder set forth in this
paragraph shall not be amended without (i) the written consent of the Holder and
the Company and (ii) the approval of the holders of a majority of the Company's
Common Stock present, or represented by proxy, and voting at any meeting called
to vote on the amendment of such restriction.

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

      "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.

      "Appraiser" has the meaning assigned to it in Section 6(c)hereof.

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      "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.

      "Common Stock" means the shares of the Company's common stock, par value
$.001 per share.

      "Company" means Geron Corporation, a Delaware corporation.

      "Convertible Securities" has the meaning assigned to it in Section
6(h)(i)(A) hereof.

      "Exercise Period" has the meaning assigned to it the Section 4 hereof.
      "Exercise Price" has the meaning assigned to it in Section 3 hereof.

      "Market Price" has the meaning assigned to it in Section 6(h)(i) hereof.

      "Options" has the meaning assigned to it in Section 6(h)(i)(A) hereof.

      "Per Share Market Value" means on any particular date (i) the closing bid
price per share of the Common Stock on such date on Nasdaq or another registered
national stock exchange on which the Common Stock is then listed or if there is
no such price on such date, then the closing bid price on such exchange or
quotation system on the date nearest preceding such date, or (ii) if the Common
Stock is not listed then on the National Market System of the Nasdaq Stock
Market or any registered national stock exchange, the closing bid price for a
share of Common Stock in the over-the-counter market, as reported by the
National Quotation Bureau Incorporated (or similar organization or agency
succeeding to its functions of reporting prices) at the close of business on
such date, or (iii) if the Common Stock is not then publicly traded the fair
market value of a share of Common Stock as determined by an Appraiser selected
in good faith by the holder of this Warrant; provided, however, that the
Company, after receipt of the determination by such Appraiser, shall have the
right to select an additional Appraiser, in which case, the fair market value
shall be equal to the average of the determinations by each such Appraiser; and
provided, further that all determinations of the Per Share Market Value shall be
appropriately adjusted for any stock dividends, stock splits or other similar
transactions during such period.

      "Purchase Agreement" means that certain Securities Purchase Agreement,
dated June 29, 2000, by and between the Company and the Purchaser (as defined in
the Purchase Agreement).

      "Redemption Event" has the meaning assigned to it in Section 6(f) hereof.

      "Registered Owner" means RGC International Investors, LDC, or such other
Person as shown on the records of the Company as being the registered owner of
this Warrant.

      "Registration Rights Agreement" means that certain Registration Rights
Agreement, dated as of June 29, 2000, by and between the Company and the Initial
Investor (as defined in the Registration Rights Agreement).

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<PAGE>
      "Restructuring Agreement" means that certain Restructuring Agreement dated
as of November 9, 2001, between the Company and RGC.

      "RGC" means RGC International Investors, LDC.

      "Trading Day(s)" means any day on which the primary market on which shares
of Common Stock are listed is open for trading.

      9. REGISTRATION RIGHTS. The Company will undertake the registration of the
Common Stock into which this Warrant is exercisable at such times and upon such
terms pursuant to the provisions of the Registration Rights Agreement.

      10. [Intentionally Omitted].

      11. 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 delivered on a business day after during normal business hours
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 Geron
Corporation, 230 Constitution Drive, Menlo Park, California 94025 attn: David
Greenwood, fax no. (650) 473-7701 with copies to Latham & Watkins, 135
Commonwealth Drive, Menlo Park, California 94025, Attn: Alan C. Mendelson, Esq.,
fax no. (650) 463-2600 and (ii) if to any Registered Owner to the address set
forth immediately below such Registered Owner's name on the signature pages to
the Restructuring Agreement or such other address as may be designated in
writing hereafter, in the same manner, by such Person.

      12. REMEDIES. The Company acknowledges that a breach by it of its
obligations hereunder will cause irreparable harm to the Registered Owner, or
assigns, by vitiating the intent and purpose of the transactions contemplated
hereby. Accordingly, the Company acknowledges that the remedy at law for breach
of its obligations hereunder will be inadequate and agrees, in the event of a
breach or threatened breach by the Company of any of the provisions hereunder,
that the Registered Owner, or assigns, shall be entitled, in addition to all
other available remedies in law or in equity, to an injunction or injunctions to
prevent or cure breaches of the provisions of this Security and to enforce
specifically the terms and provisions hereof, without the necessity of showing
economic loss and without any bond or other security being required.

              [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

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      IN WITNESS WHEREOF, the Company has caused this Warrant to be executed by
its duly authorized officer as of the date first set forth above.

                                          GERON CORPORATION

                                          By: /s/ David L. Greenwood
                                              ----------------------------------
                                              David L. Greenwood
                                              Senior Vice President, Corporate
                                              Development and Chief Financial
                                              Officer

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                                    EXHIBIT A

                              Warrant Exercise Form

TO:   GERON CORPORATION

      The undersigned hereby: (1) irrevocably subscribes for and offers to
purchase _______ shares of Common Stock of Geron Corporation, pursuant to
Warrant No. ___ heretofore originally issued to ___________________ on June 29,
2000; (2) encloses a payment of $__________ for these shares at a price of
$________ per share (as adjusted pursuant to the provisions of the Warrant); and
(3) requests that a certificate for the shares be issued in the name of the
undersigned and delivered to the undersigned at the address specified below. The
undersigned represents that it is an accredited investor within the meaning of
Regulation D under the Securities Act.

                       Date:

                       Investor Name:

                       Taxpayer Identification
                       Number:

                       By:

                       Printed Name:

                       Title:

                       Address:

                       Note: The above signature should correspond exactly with
                             the name on the face of this Warrant Certificate or
                             with the name of assignee appearing in assignment
                             form below.

AND, if said number of shares shall not be all the shares purchasable under the
within Warrant, a new Warrant Certificate is to be issued in the name of said
undersigned for the balance remaining of the shares purchasable thereunder less
any fraction of a share paid in cash and delivered to the address stated above.<PAGE>
                                                                    EXHIBIT 10.1

                             RESTRUCTURING AGREEMENT

                                     Between

                                GERON CORPORATION

                                       and

                        RGC INTERNATIONAL INVESTORS, LDC

                          Dated as of November 9, 2001
<PAGE>
                             RESTRUCTURING AGREEMENT

            THIS RESTRUCTURING AGREEMENT (this "AGREEMENT") is dated as of
November 9, 2001, between Geron Corporation, a Delaware corporation (the
"COMPANY") and RGC INTERNATIONAL INVESTORS, LDC, a Cayman Islands limited
duration company (together with its affiliates to which rights hereunder may be
transferred pursuant to Section 5.6 hereof and any other assignee or transferee
of its rights hereunder in accordance with Section 5.6 hereof, the "PURCHASER").

      WHEREAS, pursuant to the Securities Purchase Agreement, dated September
30, 1999, by and between the Company and the Purchaser (the "SERIES C PURCHASE
AGREEMENT"), the Company issued and sold to the Purchaser, and the Purchaser
purchased from the Company, an aggregate of Twelve Million Five Hundred Thousand
Dollars ($12,500,000) in principal amount of Series C Two Percent (2%)
Convertible Debentures (the "SERIES C DEBENTURES");

      WHEREAS, pursuant to the Securities Purchase Agreement, dated June 29,
2000, by and between the Company and the Purchaser (the "SERIES D PURCHASE
AGREEMENT"), the Company issued and sold to the Purchaser, and the Purchaser
purchased from the Company, an aggregate of Twenty-Five Million Dollars
($25,000,000) in principal amount of Series D Zero Coupon Convertible
Debentures, (the "SERIES D DEBENTURES"), and, warrants, (the "SERIES D
WARRANTS"), to purchase up to Eight Hundred Thirty Four Thousand Eight Hundred
Thirty Six (834,836) shares of the Company's common stock, par value $.001 per
share (the "COMMON STOCK");

      WHEREAS, (i) pursuant to the terms of the Registration Rights Agreement,
dated September 30, 1999, by and between the Company and the Purchaser (the
"SERIES C REGISTRATION RIGHTS AGREEMENT"), the Company registered with the
Securities and Exchange Commission (the "SEC") on Registration Statement No.
333-89981 the shares of Common Stock underlying the Series C Debentures (the
"SERIES C REGISTRATION STATEMENT") and (ii) pursuant to the terms of the
Registration Rights Agreement, dated June 29, 2000, by and between the Company
and the Purchaser (the "SERIES D REGISTRATION RIGHTS AGREEMENT"), the Company
registered with the SEC on Registration Statement No. 333-40984 the shares of
Common Stock underlying the Series D Debentures and the Series D Warrants (the
"SERIES D REGISTRATION STATEMENT");

      WHEREAS, the Purchaser acknowledges that the Company has filed, and
obtained effectiveness of, a Registration Statement (as defined in the Series D
Registration Rights Agreement) registering the number of shares of Common Stock
required pursuant to Section 2(a) of the Series D Registration Rights Agreement;
and

      WHEREAS, this Agreement shall provide for (i) the conversion of
outstanding balance of the Series C Debentures held by the Purchaser into shares
of Common Stock, (ii) the conversion of a portion of the Series D Debentures
held by the Purchaser into shares of Common Stock and (iii) the amendment and
restatement of the remaining Series D Debentures and Series D Warrants.

      IN CONSIDERATION of the mutual covenants contained in this Agreement, the
Company and each Purchaser agree as follows:
<PAGE>
                                    ARTICLE 1

               CONVERSION; AMENDMENT OF DEBENTURES AND WARRANTS

      1.1 CONVERSION OF DEBENTURES. Subject to the terms and conditions set
forth herein, at the Closing the Buyer shall (i) convert all of the outstanding
balance of principal and interest due under the Series C Debentures at the
Conversion Price set forth therein ($10.25 per share) into shares of Common
Stock (the "SERIES C CLOSING CONVERSION SHARES"), and (ii) convert an aggregate
of Ten Million Dollars ($10,000,000) in outstanding principal due under the
Series D Debentures at a conversion price equal to $9.89 per share into shares
of Common Stock (the "SERIES D CLOSING CONVERSION SHARES" and together with the
Series C Closing Conversion Shares, the "CLOSING CONVERSION SHARES").

      1.2 AMENDMENT OF THE DEBENTURES AND WARRANTS. (i) The Series D Debentures
shall be amended and restated and shall be reissued in the form attached hereto
as "EXHIBIT A" (the "AMENDED SERIES D DEBENTURES") and (ii) the Series D
Warrants shall be amended and restated and shall be reissued as two separate
warrants in the forms attached hereto as "EXHIBIT B" (the "SERIES D-1 WARRANT")
and "EXHIBIT C" (the "SERIES D-2 WARRANT" which together with the Series D-1
Warrants shall be collectively referred to herein as the "AMENDED SERIES D
WARRANTS").

      1.3 THE CLOSING. The closing of the transactions contemplated by this
Agreement (the "CLOSING") shall take place at the offices of Akerman, Senterfitt
& Eidson, One Southeast Third Avenue, 28th Floor, Miami, Florida 33131-1714,
immediately following the execution hereof or such later date or different
location as the parties shall agree, but not prior to the date that the
conditions set forth in Section 4.1 have been satisfied or waived by the
appropriate party (the "CLOSING DATE"). At the Closing Date:

            (a) All of the outstanding balance of the Series C Debentures shall
be converted into 635,516 shares of Common Stock and certificates evidencing
such shares of Common Stock (or electronic delivery of such shares pursuant to
Section 3.6) shall be delivered to the Purchaser;

            (b) The Series D Debentures in the aggregate amount of Ten Million
Dollars ($10,000,000) shall be converted into 1,011,122 shares of Common Stock
and certificates evidencing such shares of Common Stock (or electronic delivery
of such shares pursuant to Section 3.6) shall be delivered to the Purchaser;

            (c) The Company shall deliver to the Purchaser the Amended Series D
Debenture and the Amended Series D Warrants; and

            (d) The parties shall execute and deliver each of the
documents referred to in Section 4.1 hereof.

                                       2
<PAGE>
                                    ARTICLE 2

                         REPRESENTATIONS AND WARRANTIES

      2.1   REPRESENTATIONS, WARRANTIES AND AGREEMENTS OF THE COMPANY.  The
Company hereby makes the following representations and warranties to the
Purchaser:

            (a) ORGANIZATION AND QUALIFICATION. The Company is a corporation
duly incorporated, validly existing and in good standing under the laws of the
State of Delaware, with the requisite corporate power and authority to own,
lease, use and operate its properties and assets and to carry on its business as
currently conducted. Except as set forth on Schedule 2.1(a) (which, with the
other schedules referenced herein, have been delivered separately to the
Purchaser), the Company has no subsidiaries (collectively, the "SUBSIDIARIES"
(as defined below)). Each of the Subsidiaries is a corporation duly
incorporated, validly existing and in good standing under the laws of the
jurisdiction of its incorporation, with the full corporate power and authority
to own, lease, use and operate its properties and assets and to carry on its
business as currently conducted. Each of the Company and the Subsidiaries is
duly qualified to do business and is in good standing as a foreign corporation
in each jurisdiction in which the nature of the business conducted or property
owned by it makes such qualification necessary, except where the failure to be
so qualified or in good standing, as the case may be, would not have a Material
Adverse Effect (as defined below). "MATERIAL ADVERSE EFFECT" means any material
adverse effect on (i) the Securities (as defined below), (ii) the business,
operations, assets, financial condition or prospects of the Company and its
Subsidiaries, if any, taken as a whole, (iii) on the transactions contemplated
hereby or by the agreements or instruments to be entered into in connection
herewith, or (iv) the authority or the ability of the Company to perform its
obligations under this Agreement, the Amended Series D Debentures or the Amended
Series D Warrants. "SUBSIDIARIES" means any corporation or other organization,
whether incorporated or unincorporated, in which the Company owns, directly or
indirectly, any equity or other ownership interest and which would be deemed to
be a "significant subsidiary" (as such term is defined in Rule 1-02(w) of
Regulation S-X promulgated under the Securities Act of 1933, as amended (the
"SECURITIES ACT").

            (b) AUTHORIZATION; ENFORCEMENT. The Company has the requisite
corporate power and authority to enter into and to consummate the transactions
contemplated by this Agreement, the Amended Series D Debentures and the Amended
Series D Warrants (collectively, the "TRANSACTION Documents"), and otherwise to
carry out its obligations hereunder and thereunder including issuance of the
Securities (as defined in Section 2(d) below). The execution and delivery of
each of the Transaction Documents by the Company and the consummation by it of
the transactions contemplated hereby and thereby (including without limitation,
the issuance of the Closing Conversion Shares, the Amended Series D Debentures
and the Amended Series D Warrants and the issuance and reservation for issuance
of the Debenture Shares (as defined in Section 2(d) below) issuable upon
conversion of or otherwise pursuant to the Amended Series D Debentures and the
Warrant Shares (as defined in Section 2(d) below) issuable upon exercise of or
otherwise pursuant to the Amended Series D Warrants) have been duly authorized
by all necessary corporate action and no further action is required by the
Company, its Board of Directors or its stockholders.

                                       3
<PAGE>
Each of this Agreement and the Transaction Documents has been duly executed by
the Company and when delivered in accordance with the terms hereof will
constitute the valid and binding obligation of the Company enforceable against
the Company in accordance with its terms, except as such enforceability may be
limited by applicable bankruptcy, insolvency, reorganization, moratorium,
liquidation or similar laws relating to, or affecting generally the enforcement
of, creditors' rights and remedies or by other equitable principles of general
application.

            (c) CAPITALIZATION. As of the date hereof and immediately prior to
the Closing Date, the authorized and outstanding capital stock and all shares of
capital stock reserved for issuance pursuant to securities (other than the
Amended Series D Debentures and the Amended Series D Warrants) exercisable for,
or convertible into or exchangeable for shares of any of the capital stock of
the Company is, and will be, as set forth on Schedule 2.1(c). The issuance and
sale of all interests in such capital stock have been in compliance with all
applicable federal and state securities laws. No shares of capital stock are
entitled to preemptive or similar rights, nor is any holder of the capital stock
entitled to preemptive or similar rights arising out of any agreement or
understanding with the Company by virtue of any of the Transaction Documents.
Except as disclosed on Schedule 2.1(c), other than the Amended Series D
Debentures and the Amended Series D Warrants, there are no outstanding options,
warrants, scrip, rights to subscribe to, calls, puts or commitments of any
character whatsoever relating to securities, rights or obligations convertible
into or exchangeable for, or giving any person any right to subscribe for or
acquire any shares of capital stock, or contracts, commitments, understandings,
or arrangements by which the Company or any Subsidiary is or may become bound to
issue additional shares of capital stock, or securities or rights convertible or
exchangeable into shares of capital stock. No anti-dilution or similar
adjustment provision of securities of the Company will be triggered by the
issuance of the Closing Conversion Shares, the Amended Series D Debentures, the
Amended Series D Warrants, the Debenture Shares or the Warrant Shares except as
described on Schedule 2.1(c). The Company is not subject (contingent or
otherwise) to repurchase or otherwise acquire or retire any units of its capital
stock or any security convertible into or exchangeable for any of its capital
stock. Except as specifically disclosed in the SEC Documents (as defined below)
or except as described on Schedule 2.1(c), to the Company's best knowledge, no
Person or group of related Persons beneficially owns (as determined pursuant to
Rule 13d-3 promulgated under the Securities Exchange Act of 1934, as amended
(the "EXCHANGE ACT")) or has the right to acquire by agreement with or by
obligation binding upon the Company beneficial ownership of in excess of 5% of
the Common Stock. "PERSON" means an individual or corporation, partnership,
trust, incorporated or unincorporated association, joint venture, limited
liability company, joint stock company, government (or an agency or subdivision
thereof) or other entity of any kind.

            (d) AUTHORIZATION AND VALIDITY; ISSUANCE OF SHARES. All of the
Closing Conversion Shares, the Amended Series D Debentures and the Amended
Series D Warrants have been duly authorized, and when delivered as contemplated
hereby, will be validly issued, fully paid and non-assessable, free and clear of
all liens, encumbrances and Company rights of first refusal, other than liens
and encumbrances created by the Purchaser (collectively, "LIENS") and will not
be subject to any preemptive or similar rights. The shares of Common Stock
issuable upon conversion of or otherwise pursuant to the Amended Series D
Debentures (including, without limitation, such additional shares of Common
Stock, if any, as are issuable as a result of the events described in

                                       4
<PAGE>
Section 2(c) of the Series D Registration Rights Agreement (such shares of
Common Stock being collectively referred to herein as the "DEBENTURE SHARES")
and the shares of Common Stock issuable upon exercise of or otherwise pursuant
to the Amended Series D Warrants (the "WARRANT SHARES" and, collectively with
the Closing Conversion Shares and the Debenture Shares, the "UNDERLYING SHARES")
are and will at all times hereafter continue to be duly authorized and reserved
for issuance and the shares of Common Stock, when issued upon conversion of or
otherwise pursuant to the Amended Series D Debentures and upon exercise of or
otherwise pursuant to the Amended Series D Warrants in accordance with their
respective terms, will be validly issued, fully paid and non-assessable, free
and clear of all Liens and will not be subject to any preemptive or similar
rights. The Closing Conversion Shares, Amended Series D Debentures, Amended
Series D Warrants, Debenture Shares and Warrant Shares are collectively referred
to herein as the "SECURITIES."

            (e) ACKNOWLEDGMENT OF DILUTION. The Company understands and
acknowledges the potentially dilutive effect to the Common Stock upon issuance
of the Closing Conversion Shares, upon issuance of the Debenture Shares upon
conversion of or otherwise pursuant to the Amended Series D Debentures and upon
issuance of the Warrant Shares upon exercise of or otherwise pursuant to the
Amended Series D Warrants. The Company's directors and executive officers have
studied and fully understand the nature of the Securities being sold hereunder.
The Company further acknowledges that its obligation to issue the Closing
Conversion Shares and the Debenture Shares and Warrant Shares upon conversion of
the Amended Series D Debentures or exercise of the Amended Series D Warrants in
accordance with this Agreement, the Amended Series D Debentures and the Amended
Series D Warrants is absolute and unconditional regardless of the dilutive
effect that such issuance may have on the ownership interests of other
stockholders of the Company. Taking the foregoing into account, the Company's
Board of Directors has determined, in its good faith business judgment, that the
issuance of the Securities hereunder and the consummation of the transactions
contemplated hereby and thereby in the best interests of the Company and its
stockholders.

            (f) NO CONFLICTS. The execution, delivery and performance of the
Transaction Documents by the Company and the consummation by the Company of the
transactions contemplated hereby and thereby (including, without limitation, the
issuance of the Closing Conversion Shares and the issuance and reservation for
issuance of the Debenture Shares and Warrant Shares) do not and will not (i)
conflict with or violate any provision of the certificate of incorporation,
bylaws or other charter documents of the Company or any of the Subsidiaries,
(ii) subject to obtaining the consents referred to in Section 2.1(g), violate or
conflict with, or constitute a default (or an event which with notice or lapse
of time or both would become a default) under, or give to others any rights of
termination, amendment, acceleration or cancellation of, any agreement,
indenture, patent, license or instrument (evidencing a Company or Subsidiary
debt or otherwise) to which the Company or any Subsidiary is a party or by which
any property or asset of the Company or any Subsidiary is bound or affected, or
(iii) result in a violation of any law, rule, regulation, order, judgment,
injunction, decree or other restriction of any court or governmental authority
to which the Company or any Subsidiary is subject (including Federal and state
securities laws and regulations and regulations of any self-regulatory
organizations to which the Company or its securities are subject), or by which
any material property or asset of the Company or any Subsidiary is bound or

                                       5
<PAGE>
affected (except for such conflicts, defaults, terminations, amendments,
accelerations or cancellations that are not reasonably likely, individually or
in the aggregate, to have a Material Adverse Effect).

            (g) CONSENTS AND APPROVALS. Except as specifically set forth on
Schedule 2.1(g), neither the Company nor any Subsidiary is required to obtain
any consent, waiver, authorization or order of, give any notice to, or make any
filing or registration with, any court or other federal, state, local or other
governmental authority, regulatory agency, self-regulatory organization or stock
market or other person in connection with the execution, delivery and
performance by the Company of the Transaction Documents or to issue the Closing
Conversion Shares, the Amended Series D Debentures and Amended Series D Warrants
in accordance with the terms hereof and to issue the Debenture Shares upon
conversion of or otherwise pursuant to the Amended Series D Debentures and the
Warrant Shares upon exercise of or otherwise pursuant to the Amended Series D
Warrants, other than (i) the filing of an additional registration statement and
prospectus supplement with the SEC pursuant to Section 3.8 hereof, (ii) the
notification(s) or any letter(s) acceptable to the Nasdaq for the listing of the
Underlying Shares on the Nasdaq National Market (and with any other national
securities exchange or market on which the Common Stock is then listed), and
(iii) any filings, notices or registrations under applicable state securities
laws (together with the consents, waivers, authorizations, orders, notices and
filings referred to on Schedule 2.1(g), the "REQUIRED APPROVALS"). The Company
is not in violation of the listing requirements of the Nasdaq and does not
reasonably anticipate that the Common Stock will be delisted by the Nasdaq in
the foreseeable future. The Company and its Subsidiaries are unaware of any
facts or circumstances which might give rise to any of the foregoing.

            (h) DISCLOSURE; ABSENCE OF CERTAIN CHANGES. Neither the Schedules to
this Agreement, the Transaction Documents or any other information provided to
the Purchaser by the Company in connection with the transactions contemplated
hereby contain, nor did the SEC Documents (as defined below), when filed, or if
amended, when amended, contain any untrue statement of a material fact or omit
to state any material fact necessary in order to make the statements made herein
and therein, in light of the circumstances under which they were made, not
misleading. Except as disclosed on Schedule 2.1(h) or the SEC Documents filed on
EDGAR at least one business day prior to the date hereof, since December 31,
2000, there has been no material adverse change and no material adverse
development in the business, properties, operations, financial condition,
liabilities or results of operations or, insofar as can reasonably be foreseen,
prospects of the Company or the Subsidiaries. The Company has not taken any
steps, and does not currently expect to take any steps, to seek protection
pursuant to any bankruptcy law nor does the Company or any of its Subsidiaries
have any knowledge or reason to believe that its creditors intend to initiate
involuntary bankruptcy proceedings. No event, liability, development or
circumstance has occurred or exists, or is contemplated to occur, with respect
to the Company or its Subsidiaries or their respective businesses, properties,
operations or financial condition or, insofar as can reasonably be foreseen,
prospects, which has not been publicly announced or disclosed but under
applicable law, rule or regulation, requires public disclosure or announcement
by the Company but which has not been so publicly announced or disclosed
(assuming for this purpose that the Company's reports filed under the Exchange
Act are being incorporated into an effective registration statement filed by the
Company under the Securities Act.)

                                       6
<PAGE>
            (i) SEC DOCUMENTS; FINANCIAL STATEMENTS. The Common Stock of the
Company is registered pursuant to Section 12(g) of the Exchange Act. The Company
has filed all reports schedules, forms, statements and other documents required
to be filed by it under the Exchange Act, including pursuant to Section 13, 14
or 15(d) thereof (all of the foregoing filed prior to the date hereof and all
exhibits included therein and financial statements and schedules thereto and
documents (other than exhibits to such documents) incorporated by reference
therein, being collectively referred to herein as the "SEC DOCUMENTS"), on a
timely basis or has received a valid extension of such time of filing and has
filed any such SEC Documents prior to the expiration of any such extension. The
Company has made available to each Purchaser true and complete copies of the SEC
Documents, except for such exhibits and incorporated documents. As of their
respective dates, the SEC Documents complied in all material respects with the
requirements of the Securities Act and the Exchange Act and the rules and
regulations of the SEC promulgated thereunder, and none of the SEC Documents,
when filed, contained any untrue statement of a material fact or omitted to
state a material fact required to be stated therein or necessary in order to
make the statements therein, in light of the circumstances under which they were
made, not misleading. None of the statements made in any such SEC Documents is,
or has been, required to be amended or updated under applicable law (except for
such statements as have been amended or updated in subsequent filings prior to
the date hereof). All material agreements to which the Company or any Subsidiary
is a party or to which the property or assets of the Company or any Subsidiary
are subject have been filed as exhibits to the SEC Documents to the extent
required; neither the Company nor any of its Subsidiaries is in breach of any
agreement where such breach, individually or in the aggregate, would have a
Material Adverse Effect. The financial statements of the Company included in the
SEC Documents complied as to form in all material respects with applicable
accounting requirements and the published rules and regulations of the SEC with
respect thereto as in effect at the time of filing. Such financial statements
have been prepared in accordance with generally accepted accounting principles
applied on a consistent basis during the periods involved, except as may be
otherwise specified in such financial statements or the notes thereto, and
fairly present in all material respects the financial position of the Company as
of and for the dates thereof and the results of operations and cash flows for
the periods then ended, subject, in the case of unaudited statements, to normal
year-end audit adjustments. Except as set forth in the financial statements of
the Company included in the SEC Documents, the Company has no liabilities,
contingent or otherwise, other than (i) liabilities incurred in the ordinary
course of business subsequent to December 31, 2000 and (ii) obligations under
contracts and commitments incurred in the ordinary course of business and not
required under generally accepted accounting principles to be reflected in such
financial statements, which, individually or in the aggregate, are not material
to the financial condition or operating results of the Company.

            (j) BROKER'S FEES. No fees or commissions or similar payments with
respect to the transactions contemplated by this Agreement or the Transaction
Documents have been paid or will be payable by the Company to any broker,
financial advisor, finder, investment banker, or bank. The Purchaser shall have
no obligation with respect to any fees or with respect to any claims made by or
on behalf of other Persons for fees of a type contemplated in this Section
2.1(j) that may be due in connection with the transactions contemplated by this
Agreement and the Transaction Documents.

                                       7
<PAGE>
            (k) LISTING AND MAINTENANCE REQUIREMENTS COMPLIANCE. The principal
market on which the Common Stock is currently traded is the Nasdaq National
Market. Except as disclosed on Schedule 2.1(k), the Company has not in the three
years preceding the date hereof received notice (written or oral) from Nasdaq
(or any stock exchange, market or trading facility on which the Common Stock is
or has been listed (or on which it has been quoted)) to the effect that the
Company is not in compliance with the listing or maintenance requirements of
such market or exchange. The Company is not aware of any facts which would
reasonably lead to delisting or suspension of the Common Stock by Nasdaq. After
giving effect to the transactions contemplated by this Agreement and the
Transaction Documents, the Company believes that it is and will be in compliance
with all such maintenance requirements.

            (l) FORM S-3 ELIGIBILITY. The Company is, and at the Closing Date
will be, eligible to register securities (including the Underlying Shares) for
resale with the SEC on Form S-3 (or any successor form) promulgated under the
Securities Act.

            (m) ACKNOWLEDGMENT REGARDING PURCHASER'S PURCHASE OF SECURITIES. The
Company acknowledges and agrees that the Purchaser is acting solely in the
capacity of arm's length purchaser with respect to this Agreement and the
transactions contemplated hereby. The Company further acknowledges that the
Purchaser is not acting as a financial advisor or fiduciary of the Company (or
in any similar capacity) with respect to this Agreement and the transactions
contemplated hereby and that any statement made by the Purchaser or any of its
respective representatives or agents in connection with this Agreement and the
transactions contemplated hereby is not advice or a recommendation and is merely
incidental to the Purchaser's purchase of the Securities and has not been relied
upon by the Company, its officers or directors in any way. The Company further
represents to the Purchaser that the Company's decision to enter into this
Agreement has been based solely on the independent evaluation of the Company and
its representatives and the representations and warranties of the Purchaser set
forth herein.

      2.2   REPRESENTATIONS AND WARRANTIES OF THE PURCHASER.  The Purchaser
hereby represents and warrants to the Company as follows:

            (a) ORGANIZATION; AUTHORITY. The Purchaser is a limited duration
company duly formed, validly existing and in good standing under the laws of the
jurisdiction of its formation with the requisite power and authority, corporate
or otherwise, to enter into and to consummate the transactions contemplated
hereby and by the Transaction Documents and otherwise to carry out its
obligations hereunder and thereunder. The execution and delivery of this
Agreement by the Purchaser and the consummation by it of the transactions
contemplated hereby have been duly authorized by all necessary corporate action
and no further action is required by the Purchaser. This Agreement has been duly
executed and delivered by the Purchaser and constitutes the valid and legally
binding obligation of the Purchaser, enforceable against the Purchaser in
accordance with its terms, subject to bankruptcy, insolvency, fraudulent
transfer, reorganization, moratorium and similar laws of general applicability
relating to or affecting creditors' rights generally and to general principles
of equity.

                                       8
<PAGE>
            (b) RESIDENCY. The Purchaser is a resident of the jurisdiction set
forth immediately below the Purchaser's name on the signature pages hereto.

                                       9
<PAGE>
                                    ARTICLE 3

                                OTHER AGREEMENTS

      3.1   TRANSFER RESTRICTIONS.

            (a) If the Purchaser should decide to dispose of the Closing
Conversion Shares, the Amended Series D Debentures, the Amended Series D
Warrants, the Debentures Shares or the Warrant Shares held by it, the Purchaser
understands and agrees that it may do so only (i) pursuant to an effective
registration statement under the Securities Act, (ii) to the Company, (iii)
pursuant to an available exemption from the registration requirements of the
Securities Act, or (iv) pursuant to Rule 144 promulgated under the 1933 Act (or
a successor rule) ("RULE 144"). In connection with any transfer of any Closing
Conversion Shares, Amended Series D Debentures, Amended Series D Warrants,
Debenture Shares or Warrant Shares pursuant to clause (iii) of the preceding
sentence, the Company may require the transferor thereof to provide to the
Company a written opinion of counsel experienced in the area of United States
securities laws selected by the transferor, the form and substance of which
opinion shall be customary for opinions of counsel in comparable transactions,
to the effect that such transfer does not require registration of such
transferred securities under the Securities Act. Notwithstanding the foregoing,
the Company hereby consents to and agrees to register any transfer by the
Purchaser to an "affiliate" (as defined in Rule 144) of the Purchaser, provided
that the transferee certifies to the Company that it is an "accredited investor"
as defined in Rule 501(a) under the Securities Act and agrees to be bound by the
terms of this Agreement and, if applicable, the Series C Registration Rights
Agreement or Series D Registration Rights Agreement. Such transferee shall have
the rights and obligations of the Purchaser under this Agreement and, if
applicable, the Series C Registration Rights Agreement or Series D Registration
Rights Agreement. Notwithstanding the foregoing or anything else contained
herein to the contrary, the Securities may be pledged as collateral in
connection with a bona fide margin account or other lending arrangement;
provided, however, that upon execution on any such pledge, the pledgee shall be
subject to the restrictions on transfer of the Securities contained in this
Agreement.

            (b) The Purchaser agrees to the imprinting, so long as is required
by this Section 3.1(b), of the following legend on the Closing Conversion
Shares, Amended Series D Debentures, the Amended Series D Warrants, the
Debenture Shares and the Warrant Shares:

                    THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED
            WITH THE SECURITIES AND EXCHANGE COMMISSION IN RELIANCE UPON AN
            EXEMPTION FROM REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS
            AMENDED (THE "ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD
            EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE ACT
            OR PURSUANT TO AN AVAILABLE EXEMPTION FROM, OR IN A TRANSACTION NOT
            SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE ACT.

                                       10
<PAGE>
      Neither the Closing Conversion Shares, the Amended Series D Debentures,
the Amended Series D Warrants, the Debenture Shares, nor the Warrant Shares
shall contain the legend set forth above if (i) the issuance of any of such
Securities occurs at any time while a Registration Statement (as defined in the
Series C and Series D Registration Rights Agreements) covering such Securities
is effective under the Securities Act, (ii) in the written opinion of counsel to
the Company experienced in the area of United States securities laws such legend
is not required under applicable requirements of the Securities Act (including
judicial interpretations and pronouncements issued by the staff of the SEC),
(iii) such holder provides the Company with reasonable assurances that such
security can be sold pursuant to Rule 144 and such security is sold pursuant to
Rule 144, or (iv) such Closing Conversion Shares, Amended Series D Debentures,
Amended Series D Warrants, Debenture Shares or Warrant Shares may be sold
pursuant to Rule 144(k). The Company agrees that it will provide each Purchaser,
upon request, with a certificate or certificates representing Closing Conversion
Shares, Amended Series D Debentures, Amended Series D Warrants, Debenture Shares
or Warrant Shares, free from such legend at such time as such legend is no
longer required hereunder. Purchaser agrees to sell all Amended Series D
Debentures, Amended Series D Warrants and Underlying Shares, including those
from which the legend set forth in this Section 3.1(b) has been removed, in
compliance with all applicable prospectus delivery requirements under the
Securities Act pursuant to Rule 144 or pursuant to another available exemption
under the Securities Act.

      3.2 STOP TRANSFER INSTRUCTION. The Company may make notations on its
records or give instructions to any transfer agent with regard to the
restrictions on transfer set forth in Section 3.1; provided, however, the
Company may not make any notation on its records or give instructions to any
transfer agent of the Company which enlarge the restrictions on transfer set
forth in Section 3.1.

      3.3 FURNISHING OF INFORMATION; ELIGIBILITY TO USE FORM S-3. As long as the
Purchaser owns the Closing Conversion Shares, the Amended Series D Debentures,
the Amended Series D Warrants, the Debenture Shares or the Warrant Shares, the
Company will cause the Common Stock to continue at all times to be registered
under 12(g) of the Exchange Act, will 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, 14 or 15(d) of the Exchange Act and will not take any action or file any
document (whether or not permitted by the Exchange Act or the rules thereunder)
to terminate or suspend such reporting and filing obligations. The Company
further covenants that it will take such further action as any holder of the
Closing Conversion Shares, the Amended Series D Debentures, the Amended Series D
Warrants, the Debenture Shares or the Warrant Shares may reasonably request, all
to the extent required from time to time to enable such Person to sell the
Closing Conversion Shares, Amended Series D Debentures, the Amended Series D
Warrants, the Debenture Shares, or the Warrant Shares without registration under
the Securities Act within the limitation of the exemptions provided by Rule 144
promulgated under the Securities Act. The Company will take all necessary action
to continue to meet, the "registrant eligibility" requirements set forth in the
general instructions to Form S-3.

                                       11
<PAGE>
      3.4 FILING OF FORM 8-K. Prior to 3:00 p.m. eastern standard time on
November 13, 2001, the Company shall file a Form 8-K with the SEC describing the
terms of the transaction contemplated by this Agreement and the Transaction
Documents in the form required by the Exchange Act.

      3.5 EFFECT OF EXISTING AGREEMENTS. Notwithstanding anything to the
contrary contained in this Agreement, the Series C Purchase Agreement, the
Series D Purchase Agreement, the Series C Registration Rights Agreement and the
Series D Registration Rights Agreement shall remain in full force and effect.

      3.6 ISSUANCE OF CONVERSION SHARES. In lieu of delivering physical
certificates representing the Common Stock to be issued upon conversion of the
Series C Debentures and Series D Debentures at Closing pursuant this Agreement,
provided the Company's transfer agent is participating in the Depository Trust
Company ("DTC") Fast Automated Securities Transfer program, the Company shall
use its best efforts to cause its transfer agent to electronically transmit the
Common Stock issuable upon conversion of the Series C Debentures and Series D
Debentures at Closing to the Purchaser by crediting the account of Purchaser's
Prime Broker with DTC through its Deposit Withdrawal Agent Commission ("DWAC")
system (to the extent not inconsistent with any provisions of the Series C and
Series D Purchase Agreements). If the Company is required to issue certificates
representing the Common Stock to be issued upon conversion of the Series C
Debentures and Series D Debentures at Closing pursuant this Agreement, such
certificates shall be free from any legend or other restriction on transfer.

      3.7  LISTING AND RESERVATION OF DEBENTURE SHARES AND WARRANT SHARES.

            (a) (i) The Company shall promptly prepare and file with Nasdaq (as
well as any other national securities exchange or market on which the Common
Stock is then listed) a Notification Form(s) for Listing of Additional Shares or
a letter(s) acceptable to Nasdaq covering and listing a number of shares of
Common Stock which is at least equal to the aggregate amount of Underlying
Shares that have not been previously listed on Nasdaq in connection with the
issuance of the Series C and Series D Debentures and the Series D Warrants, (ii)
take all steps necessary to cause the Underlying Shares not previously approved
for listing on Nasdaq to be approved for listing on Nasdaq (as well as on any
other national securities exchange or market on which the Common Stock is then
listed) as soon as possible thereafter and (iii) provide to the Purchaser
evidence of such filing(s). So long as any Purchaser owns any of the Securities,
the Company shall maintain, so long as any other shares of Common Stock shall be
so listed, such listing of the Closing Conversion Shares and all Debenture
Shares and Warrant Shares from time to time issuable upon conversion of the
Amended Series D Debentures or exercise of the Amended Series D Warrants.
Neither the Company nor any of its Subsidiaries shall take any action which may
result in the delisting or suspension of the Common Stock on Nasdaq. The Company
will obtain and, so long as any Purchaser owns any of the Securities, maintain
the listing and trading of its Common Stock on Nasdaq, the Nasdaq SmallCap
Market ("NASDAQ SMALLCAP"), the New York Stock Exchange ("NYSE"), or the
American Stock Exchange ("AMEX") and will comply in all respects with the
Company's reporting, filing and other obligations under the bylaws or rules of
the National Association of Securities Dealers ("NASD") and such exchanges, as
applicable. The Company shall

                                       12
<PAGE>
promptly provide to the Purchaser copies of any notices it receives from Nasdaq
regarding the continued eligibility of the Common Stock for listing on such
automated quotation system.

            (b) The Company shall reserve 125% of the number of shares of its
authorized but unissued Common Stock which would be issuable upon full
conversion of the Amended Series D Debentures or exercise of the Amended Series
D Warrants. Shares of Common Stock reserved for issuance upon conversion of the
Amended Series D Debentures or exercise of the Amended Series D Warrants shall
be allocated pro rata to each Purchaser in accordance with the amount of Amended
Series D Debentures or exercise of the Amended Series D Warrants. The Company
shall not reduce the number of shares of Common Stock reserved for issuance upon
conversion of or otherwise pursuant to the Amended Series D Debentures and
exercise of or otherwise pursuant to the Amended Series D Warrants without the
consent of each such Purchaser. If, at any time after the Closing Date, the
number of shares of Common Stock authorized and reserved for issuance is below
125% of the sum of (x) the number of Debenture Shares issuable upon conversion
of or otherwise pursuant to the Amended Series D Debentures (based on the
Conversion Price (as defined in the Amended Series D Debenture) in effect from
time to time) and (y) the aggregate number of Warrant Shares issued and issuable
upon exercise of or otherwise pursuant to the Amended Series D Warrants (based
on the Exercise Price (as defined in the Amended Series D Warrants) of the
Amended Series D Warrants in effect from time to time), the Company will
promptly take all corporate action necessary to authorize and reserve a
sufficient number of shares, including, without limitation, calling a special
meeting of stockholders to authorize additional shares to meet the Company's
obligations under this Section 3.7(b), in the case of an insufficient number of
authorized shares, and using its best efforts to obtain stockholder approval of
an increase in such authorized number of shares.

      3.8 REGISTRATION. The Company represents that the re-sale of the Series C
Closing Conversion Shares are covered by the Series C Registration Statement and
such registration statement remains effective and such shares of Common Stock
are, and will be, freely tradable by the Purchaser. The Company represents that
the Series D Registration Statement covers the re-sale of the Series D Closing
Conversion Shares, the Debenture Shares and Warrant Shares by the Purchaser and
that such registration remains effective and such shares of Common Stock are,
and will be, freely tradable by the Purchaser; provided that the number of
shares of Common Stock presently registered thereunder is insufficient to allow
for the re-sale of all of the Series D Closing Conversion Shares, the Debenture
Shares and Warrant Shares. The Company acknowledges and agrees that the Series D
Registration Rights Agreement shall remain in full force and effect and that the
Series D Closing Conversion Shares, the Debenture Shares and Warrant Shares
shall be covered by such agreement to the same extent as the shares of Common
Stock underlying the Series D Debentures and Series D Warrants. In accordance
with its obligations pursuant to Section 3(b) of the Series D Registration
Rights Agreement, the Company shall file (i) a prospectus supplement to the
Series D Registration Statement to update the disclosure therein to describe the
transaction contemplated by this Agreement (the "SERIES D REGISTRATION STATEMENT
SUPPLEMENT") and (ii) a new Registration Statement (as defined in the Series D
Registration Rights Agreement) pursuant to Rule 462(b) under the 1933 Act (the
"NEW SERIES D REGISTRATION STATEMENT") so as to increase the number of shares
registered pursuant to both the Series D Registration Statement and the New
Series D Registration Statement to the maximum amount permitted by such rule
(2,504,341 (subject to

                                       13
<PAGE>
adjustment for stock splits, stock dividends, combinations and similar
transactions)) (the "MAXIMUM SERIES D REGISTERED SHARES"). So long as the
Company files and obtains effectiveness of the New Series D Registration
Statement and the Series D Registration Supplement within fifteen (15) days of
the Closing Date and the Maximum Series D Registered Shares remain registered
during the Registration Period (as defined in the Series D Registration Rights
Agreement), the Company shall not be required to register 125% of the
Registrable Securities (as defined in the Series D Registration Rights
Agreement) issued or issuable in accordance with Section 3(b) of the Series D
Registration Rights Agreement. Other than the modifications described in the
preceding sentence, all of the provisions of the Series D Registration Rights
Agreement shall remain in full force and effect (including, but not limited to,
Section 2(c)).

      3.9 TRANSFER AGENT INSTRUCTIONS. The Company shall issue irrevocable
instructions to its transfer agent, and any subsequent transfer agent, to issue
certificates, registered in the name of the Purchaser or its nominee(s), for the
Closing Conversion Shares, the Debenture Shares and the Warrant Shares in such
amounts as specified from time to time by each Purchaser to the Company in a
form acceptable to the Purchaser (the "IRREVOCABLE TRANSFER AGENT
INSTRUCTIONS"). Prior to registration of the Closing Conversion Shares, the
Debenture Shares and Warrant Shares under the Securities Act or the date on
which the Debenture Shares and Warrant Shares may be sold without limitation or
restriction as to volume pursuant to Rule 144(k), all such certificates shall
bear the restrictive legend specified in Section 3.1(b) of this Agreement. The
Company warrants that no instruction other than the Irrevocable Transfer Agent
Instructions referred to in this Section 3.9, and stop transfer instructions to
give effect to Section 3.1 hereof, prior to registration of the Closing
Conversion Shares, the Debenture Shares and the Warrant Shares under the
Securities Act or the date on which the Closing Conversion Shares, the Debenture
Shares and Warrant Shares may be sold without limitation or restriction as to
volume pursuant to Rule 144(k), will be given by the Company to its transfer
agent and that the Closing Conversion Shares, the Debenture Shares and the
Warrant Shares shall otherwise be freely transferable on the books and records
of the Company as and to the extent provided in this Agreement and the
Registration Rights Agreement. Nothing in this Section 3.9 shall affect the
Purchaser's obligation and agreement set forth in Section 3.1(b). If the
Purchaser provides the Company with an opinion of counsel, in form and substance
customary for opinions in comparable transactions, to the effect that a public
sale, assignment or transfer of the Closing Conversion Shares, the Debentures,
the Debenture Shares, the Warrants and the Warrant Shares may be made without
registration under the Securities Act or the Purchaser provides the Company with
reasonable assurances that the Closing Conversion Shares, the Debentures,
Warrants, the Debenture Shares and the Warrant Shares can be sold without
limitation or restriction as to volume pursuant to Rule 144(k), the Company
shall permit the transfer, and, in the case of the Closing Conversion Shares,
the Debenture Shares and the Warrant Shares, promptly instruct its transfer
agent to issue one or more certificates in such name and in such denominations
as specified by the Purchaser and without any restrictive legend. The Company
acknowledges that a breach by it of its obligations hereunder will cause
irreparable harm to the Purchasers by violating the intent and purpose of the
transactions contemplated hereby. Accordingly, the Company acknowledges that the
remedy at law for a breach of its obligations under this Section 3.9 will be
inadequate and agrees, in the event of a breach or threatened breach by the
Company of the provisions of this Section 3.9, that the Purchaser shall be
entitled, in addition to all other available remedies, to an order and/or

                                       14
<PAGE>
injunction restraining any breach and requiring immediate issuance and transfer,
without the necessity of showing economic loss and without any bond or other
security being required.

                                    ARTICLE 4

                                   CONDITIONS

      4.1   CONDITIONS PRECEDENT.

            (a) CONDITIONS PRECEDENT TO THE OBLIGATION OF THE COMPANY. The
obligation of the Company to consummate the transactions contemplated hereunder
is subject to the satisfaction or waiver (with prior written notice to the
Purchaser) by the Company, at or before the Closing, of each of the following
conditions:

                    (i)   ACCURACY OF THE PURCHASER'S REPRESENTATIONS AND
      WARRANTIES. The representations and warranties of the Purchaser in this
      Agreement shall be true and correct in all material respects as of the
      date when made and as of the Closing Date;

                    (ii)  PERFORMANCE BY THE PURCHASER. The Purchaser shall have
      performed, satisfied and complied in all material respects with all
      covenants, agreements and conditions required by this Agreement to be
      performed, satisfied or complied with by the Purchaser at or prior to the
      Closing; and

                    (iii) NO INJUNCTION. No litigation, statute, rule,
      regulation, executive order, decree, ruling or injunction shall have been
      enacted, entered, promulgated or endorsed by any court or governmental
      authority of competent jurisdiction or any self-regulatory organization
      having authority over the matters contemplated hereby which prohibits the
      consummation of any of the transactions contemplated by this Agreement or
      the Transaction Documents.

            (b) CONDITIONS PRECEDENT TO THE OBLIGATION OF THE PURCHASER. The
obligations of the Purchaser hereunder are subject to the satisfaction or waiver
(with prior written notice to the Company) by the Purchaser, at or before the
Closing, of each of the following conditions:

                    (i)   ACCURACY OF THE COMPANY'S REPRESENTATIONS AND
      WARRANTIES.  The representations and warranties of the Company set
      forth in this Agreement shall be true and correct in all material
      respects as of the date when made and as of the Closing Date;

                    (ii)  PERFORMANCE BY THE COMPANY. The Company shall have
      performed, satisfied and complied in all material respects with all
      covenants, agreements and conditions required by this Agreement to be
      performed, satisfied or complied with by the Company at or prior to the
      Closing;

                                       15
<PAGE>
                    (iii) NO INJUNCTION. No litigation, statute, rule,
      regulation, executive order, decree, ruling or injunction shall have been
      enacted, entered, promulgated or endorsed by any court or governmental
      authority of competent jurisdiction or any self-regulatory organization
      having authority over the matters contemplated hereby which prohibits the
      consummation of any of the transactions contemplated by this Agreement and
      the Transaction Documents;

                    (iv)  NO SUSPENSIONS OF TRADING IN COMMON STOCK. The
      trading in the Common Stock shall not have been suspended by the SEC or
      on Nasdaq which suspension shall remain in effect;

                    (v)   LISTING OF COMMON STOCK.  The Common Stock shall
      have been at all times since the date hereof, and on the Closing Date
      shall be, listed for trading on Nasdaq;

                    (vi)  REQUIRED APPROVALS. All Required Approvals shall
      have been obtained;

                    (vii) SHARES OF COMMON STOCK. The Company shall have duly
      reserved the number of Debenture Shares and Warrant Shares required by
      this Agreement and the Transaction Documents to be reserved for issuance
      upon conversion of the Amended Series D Debentures and the exercise of the
      Amended Series D Warrants;

                    (viii) CHANGE OF CONTROL. No Change of Control shall have
      occurred between the date hereof and the Closing Date. "CHANGE OF CONTROL"
      means the occurrence of any of (i) an acquisition after the date hereof by
      an individual or legal entity or "group" (as described in Rule 13d-5(b)(1)
      promulgated under the Exchange Act), other than the Purchaser or any of
      its Affiliates, of in excess of 50% of the voting securities of the
      Company, (ii) a replacement of more than one-half of the members of the
      Company's Board of Directors which is not approved by those individuals
      who are members of the Board of Directors on the date hereof in one or a
      series of related transactions, (iii) the merger of the Company with or
      into another entity, consolidation or sale of all or substantially all of
      the assets of the Company in one or a series of related transactions or
      (iv) the execution by the Company of an agreement to which the Company is
      a party or by which it is bound, providing for any of the events set forth
      above in (i), (ii) or (iii); and

                    (ix)  TRANSFER AGENT INSTRUCTIONS.  The Irrevocable
      Transfer Agent Instructions, in a form acceptable to the Purchaser,
      shall have been delivered to and acknowledged in writing by the
      Company's transfer agent.

            (c) DELIVERY OF DOCUMENTS AND CERTIFICATES BY THE COMPANY. At the
Closing, the Company shall have delivered to the Purchaser the following in form
and substance reasonably satisfactory to the Purchaser:

                                       16
<PAGE>
                    (i)   OPINION.  An opinion of the Company's legal counsel
      in the form attached hereto as EXHIBIT "D" dated as of the Closing Date;

                    (ii)  ENFORCEABILITY OPINION.  An opinion of the
      Company's legal counsel in the state of Delaware in the form attached
      hereto as EXHIBIT "E" dated as of the Closing Date;

                    (iii) DEBENTURE.  A Debenture(s) representing the Amended
      Series D Debenture, registered in the name of such Purchaser, each in
      form satisfactory to the Purchaser;

                    (iv)  STOCK PURCHASE WARRANT.  The Amended Series D
      Warrants, registered in the name of the Purchaser;

                    (v) OFFICER'S CERTIFICATE. An Officer's Certificate dated
      the Closing Date and signed by an executive officer of the Company
      confirming the accuracy of the Company's representations, warranties and
      covenants as of such Closing Date and confirming the compliance by the
      Company with the conditions precedent set forth in this Section 4.1 as of
      the Closing Date;

                    (vi) SECRETARY'S CERTIFICATE. A Secretary's Certificate
      dated the Closing Date and signed by the Secretary or Assistant Secretary
      of the Company certifying (A) that attached thereto is a true and complete
      copy of the Certificate of Incorporation of the Company, as in effect on
      the Closing Date, (B) that attached thereto is a true and complete copy of
      the by-laws of the Company, as in effect on the Closing Date and (C) that
      attached thereto is a true and complete copy of the resolutions duly
      adopted by the Board of Directors of the Company authorizing the
      execution, delivery and performance this Agreement and of the Transaction
      Documents, and that such resolutions have not been modified, rescinded or
      revoked; and

                    (vii) STOCK CERTIFICATES. Certificates (or electronic
      delivery pursuant to Section 3.6) for 1,646,638 shares of Common Stock
      issued pursuant to the conversion of the Series C Debentures and Series D
      Debentures.

                    (viii) REGISTRATION RIGHTS AGREEMENT. The Amendment No. 1 to
      the Registration Rights Agreement (the "REGISTRATION RIGHTS AGREEMENT
      AMENDMENT") in the form attached hereto as EXHIBIT F executed by the
      Company.

                                       17
<PAGE>
            (d) DELIVERY OF DOCUMENTS BY THE PURCHASER. At the Closing, the
Purchaser shall have delivered to the Company:

                    (i)   the Series C Debentures;

                    (ii)  the Series D Debentures;

                    (iii) the Series D Warrants; and

                    (IV)  the Registration Rights Agreement Amendment
      executed by the Purchaser.

                                       18
<PAGE>
                                    ARTICLE 5

                                  MISCELLANEOUS

      5.1 FEES AND EXPENSES. Except as set forth in the Registration Rights
Agreement, each party shall pay the fees and expenses of its advisers, counsel,
accountants and other experts, if any, and all other expenses incurred by such
party incident to the negotiation, preparation, execution, delivery and
performance of this Agreement. The Company shall pay all stamp and other taxes
and duties levied in connection with the issuance of the Closing Conversion
Shares, the Debenture Shares and the Warrant Shares pursuant hereto.

      5.2 ENTIRE AGREEMENT; AMENDMENTS. This Agreement, together with the
Exhibits and Schedules hereto, the Series C Purchase Agreement, the Series C
Registration Rights Agreement, the Series D Purchase Agreement, the Series D
Registration Rights Agreement and the Transaction Documents 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.

      5.3   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 on the first
business day following such delivery (if delivered on a business day after
during normal business hours 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 Geron Corporation, 230
Constitution Drive, Menlo Park, California  94025 attention: David Greenwood,
fax no. (650) 473-7701 with copies to Latham & Watkins, 135 Commonwealth
Drive, Menlo Park, California 94025, Attention:  Alan C. Mendelson, Esq., fax
no. (650) 463-2600, and (ii) if to the Purchaser to c/o Rose Glen Capital
Management L.P., 3 Bala Plaza East, Suite 501, 251 St. Asaphs Road, Bala
Cynwyd, Pennsylvania 19004, Attention:  Wayne D. Bloch; fax no. (610)
617-0570 with copies to Akerman, Senterfitt & Eidson, P.A., One Southeast
Third Avenue, 28th Floor, Miami, Florida 33131-1714  attention: Bradley D.
Houser, Esq., fax no. (305) 374-5095, or such other address as may be
designated in writing hereafter, in the same manner, by such Person.

      5.4 AMENDMENTS; WAIVERS. No provision of this Agreement may be waived or
amended except in a written instrument signed, in the case of an amendment, by
both the Company and a majority-in-interest of the Purchasers or, in the case of
a waiver, by the party against whom enforcement of any such waiver is sought. No
waiver of any default with respect to any provision, condition or requirement of
this Agreement shall be deemed to be a continuing waiver in the future or a
waiver of any other provision, condition or requirement hereof, nor shall any
delay or omission of either party to exercise any right hereunder in any manner
impair the exercise of any such right accruing to it thereafter. Notwithstanding
the foregoing, no such amendment shall be effective to the extent that it
applies to less than all of the holders of the Securities. The Company shall not
offer

                                       19
<PAGE>
or pay any consideration to any Purchaser for consenting to such an amendment or
waiver unless the same consideration is offered to each Purchaser and the same
consideration is paid to each Purchaser which consents to such amendment or
waiver.

      5.5 HEADINGS; INTERPRETIVE MATTERS. The headings herein are for
convenience only, do not constitute a part of this Agreement and shall not be
deemed to limit or affect any of the provisions hereof. No provision of this
Agreement will be interpreted in favor of, or against, any of the parties hereto
by reason of the extent to which any such party or its counsel participated in
the drafting thereof or by reason of the extent to which any such provision is
inconsistent with any prior draft hereof or thereof.

      5.6 SUCCESSORS AND ASSIGNS. This Agreement shall be binding upon and inure
to the benefit of the parties and their successors and permitted assigns. The
Company may not assign this Agreement or any rights or obligations hereunder
without the prior written consent of the Purchasers. The Purchaser may assign
this Agreement or any rights or obligations hereunder to any Affiliate thereof
without the prior written consent of the Company. All assignees must make the
representations and warranties set forth in Section 2.2 and otherwise comply
with the terms of this Agreement otherwise applicable to its assignor. This
provision shall not limit the Purchaser's right to transfer the Securities in
accordance with all of the terms of this Agreement or under the Registration
Rights Agreement.

      5.7 NO THIRD-PARTY BENEFICIARIES. This Agreement is intended for the
benefit of the parties hereto and their respective permitted successors and
assigns and is not for the benefit of, nor may any provision hereof be enforced
by, any other Person.

      5.8 GOVERNING LAW. This Agreement and the Transaction Documents shall be
governed by and interpreted in accordance with the laws of the State of Delaware
applicable to agreements made and to be performed in the State of Delaware
(without regard to principles of conflict laws). Both parties irrevocably
consent to the jurisdiction of the United States federal courts and the state
courts located in Delaware with respect to any suit or proceeding based on or
arising under this Agreement, the Transaction Documents, the agreements entered
into in connection herewith and therewith and the transactions contemplated
hereby or thereby and irrevocably agree that all claims in respect of such suit
or proceeding may be determined in such courts. Both parties irrevocably waive
the defense of an inconvenient forum to the maintenance of such suit or
proceeding. Both parties further agree that service of process upon a party
mailed by first class mail shall be deemed in every respect effective service of
process upon the party in any such suit or proceeding, and the parties herby
expressly waive any defenses to the sufficiency of process or service of process
made in this manner. Nothing herein shall affect either party's right to serve
process in any other manner permitted by law. Both parties agree that a final
non-appealable judgment in any such suit or proceeding shall be conclusive and
may be enforced in other jurisdictions by suit on such judgment or in any other
lawful manner.

      5.9 SURVIVAL. The agreements, covenants, representations, warranties and
provisions contained in this Agreement shall survive the delivery of the Amended
Series D Debentures and the

                                       20
<PAGE>
Amended Series D Warrants pursuant to this Agreement and the Closing hereunder
and any conversion of the Amended Series D Debentures or exercise of the Amended
Series D Warrants.

      5.10 EXECUTION. This Agreement may be executed in two or more
counterparts, all of which when taken together shall be considered one and the
same agreement and shall become effective when counterparts have been signed by
each party and delivered to the other party, it being understood that both
parties need not sign the same counterpart. 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
page were an original thereof.

      5.11 PUBLICITY. The Company and the Purchaser shall consult with each
other in issuing any press releases, filings with the SEC, NASD or any stock
exchange or interdealer quotation system or otherwise making public statements
with respect to the transactions contemplated hereby and neither party shall
issue any such press release, filings with the SEC, NASD or any stock exchange
or interdealer quotation system or otherwise make any such public statement
without the prior written consent of the other, which consent shall not be
unreasonably withheld or delayed, except that no prior consent shall be required
if such disclosure is required by law, rule or regulation, in which such case
the disclosing party shall provide the other party with prior notice of such
public statement. The Company shall not otherwise publicly disclose the names of
any of the Purchaser without the Purchaser's prior written consent.

      5.12 SEVERABILITY. In case any one or more of the provisions of this
Agreement shall be invalid or unenforceable in any respect, the validity and
enforceability of the remaining terms and provisions of this Agreement shall not
in any way be affected or impaired thereby and the parties will attempt to agree
upon a valid and enforceable provision which shall be a reasonable substitute
therefor, and upon so agreeing, shall incorporate such substitute provision in
this Agreement.

      5.13 REMEDIES. The Company acknowledges that a breach by it of its
obligations hereunder will cause irreparable harm to each Purchaser by vitiating
the intent and purpose of the transactions contemplated hereby. Accordingly, the
Company acknowledges that the remedy at law for breach of its obligations
hereunder will be inadequate and agrees, in the event of a breach or threatened
breach by the Company of any of the provisions hereunder, that each Purchaser
shall be entitled, in addition to all other available remedies in law or in
equity, to an injunction or injunctions to prevent or cure breaches of the
provisions of this Agreement and to enforce specifically the terms and
provisions hereof, without the necessity of showing economic loss and without
any bond or other security being required.

      5.14 PAYMENT SET ASIDE. To the extent that the Company makes a payment or
payments to the Purchaser hereunder or pursuant to the Registration Rights
Agreement or the Purchaser enforces or exercises their rights hereunder or
thereunder, and such payment or payments or the proceeds of such enforcement or
exercise or any part thereof are subsequently invalidated, declared fraudulent
or preferential, set aside, recovered from, disgorged by or are required to be
refunded, repaid or otherwise restored to the Company, a trustee, receiver or
any other Person under any law (including, without limitation, any bankruptcy
law, state or federal law, common law or equitable

                                       21
<PAGE>
cause of action), then to the extent of any such restoration the obligation or
part thereof originally intended to be satisfied shall be revived and continued
in full force and effect as if such payment had not been made or such
enforcement or setoff had not occurred.

      5.15 FURTHER ASSURANCES. Each party shall do and perform, or cause to be
done and performed, all such further acts and things, and shall execute and
deliver all such other agreements, certificates, instruments and documents, as
the other party may reasonably request to the extent necessary to carry out the
intent and accomplish the purposes of this Agreement and the consummation of the
transactions contemplated hereby.

      5.16 NO STRICT CONSTRUCTION. The language used in this Agreement will be
deemed to be the language chosen by the parties to express their mutual intent,
and no rules of strict construction will be applied against any party.

                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                       22
<PAGE>
      IN WITNESS WHEREOF, the parties hereto have caused this Restructuring
Agreement to be duly executed by their respective authorized persons as of the
date first indicated above.

                                    GERON CORPORATION

                                    By:      /s/ David L. Greenwood
                                             -----------------------------------
                                    Name:    David L. Greenwood
                                    Title:   Senior Vice President, Corporate
                                             Development and Chief Financial
                                             Officer

                                    RGC INTERNATIONAL INVESTORS, LDC
                                    By:      Rose Glen Capital Management,
                                             L.P., Investment Manager
                                             By:   RGC General Partner Corp.,
                                                   as General Partner

                                       By:    /s/ Wayne D. Bloch
                                             -----------------------------------
                                             Wayne D. Bloch
                                             Managing Director

                                    Residence:    Cayman Islands

                                    ADDRESS:

                                    c/o Rose Glen Capital Management, L.P.
                                    3 Bala Plaza East, Suite 501
                                    251 St. Asaphs Road
                                    Bala Cynwyd, PA  19004
                                    Facsimile:  (610) 617-0570
                                    Telephone:  (610) 617-5900

                                       23

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