Exhibit 4.3
                                 FORM OF WARRANT
THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED (THE "SECURITIES ACT"), OR ANY STATE SECURITIES LAWS, AND HAS BEEN
ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE
OR DISTRIBUTION THEREOF. NO SUCH SALE OR DISPOSITION MAY BE EFFECTED WITHOUT AN
EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL,
REASONABLY SATISFACTORY TO THE COMPANY, THAT SUCH REGISTRATION IS NOT REQUIRED
UNDER THE SECURITIES ACT.
Warrant No.:  BUR - 101                                Number of Shares:  50,000
              ---------                                                   ------
 Date of Issuance:  March 12, 2003
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                                GERON CORPORATION
                         COMMON STOCK WARRANT AGREEMENT
Geron Corporation (the "Company"), for value received, hereby certifies that
▇▇▇▇▇▇▇ & Company or their registered assigns (in accordance with Section 3
below) (the "Registered Holder"), is entitled, subject to the terms set forth
below, to purchase from the Company, at any time after the date hereof and on or
before the Expiration Date (as defined in Section 5 below), up to 50,000 shares
of Common Stock of the Company, as adjusted from time to time pursuant to the
terms of this Common Stock Warrant Agreement ("Warrant"), at a purchase price of
$3.00 per share. The shares purchasable upon exercise of this Warrant are
hereinafter referred to as the "Warrant Stock." The exercise price per share of
Warrant Stock is hereinafter referred to as the "Purchase Price."
     1.  EXERCISE.
         (a) MANNER OF EXERCISE. This Warrant may be exercised by the Registered
Holder, by surrendering this Warrant, with the purchase form appended hereto as
Exhibit A duly executed by such Registered Holder or by such Registered Holder's
duly authorized attorney-in-fact, at the principal office of the Company, or at
such other office or agency as the Company may designate, accompanied by payment
in full by cash, check or wire transfer of the Purchase Price payable in respect
of the number of shares of Warrant Stock purchased upon such exercise.
         (b) EFFECTIVE TIME OF EXERCISE. The exercise of this Warrant shall be
 deemed to have been effected immediately prior to the close of business on the
 day on which this Warrant shall have been surrendered to the Company, with
 payment of the applicable Purchase Price, as provided in Section 1(a) above. At
 such time, the person or persons in whose name or names any certificates for
 Warrant Stock shall be issuable upon such exercise as provided in Section 1(c)
 below shall be deemed to have become the holder or holders of record of the
 Warrant Stock represented by such certificates.
         (c) DELIVERY TO REGISTERED HOLDER. As soon as practicable after the
 exercise of this Warrant, and in any event within ten (10) business days
 thereafter, the Company, at its expense, will cause to be issued in the name
 of, and delivered to, the Registered Holder, or as such Registered Holder (upon
 payment by such Registered Holder of any applicable transfer taxes) may direct,
 a certificate or certificates for the number of shares of Warrant Stock to
 which such Registered Holder shall be entitled.
     2.  CERTAIN ADJUSTMENTS.
         (a) MERGERS AND CONSOLIDATIONS. If at any time there shall be a merger
 or consolidation of the Company with another corporation, then, as a part of
 such merger or consolidation, lawful provision shall be made so that the
 Registered Holder shall thereafter be entitled to receive upon exercise of this
 Warrant during the period specified in this Warrant and upon payment of the
 Purchase Price, the number of shares of stock or other securities or property
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 of the Company or the successor corporation resulting from such merger or
 consolidation, to which a holder of the Common Stock deliverable upon exercise
 of this Warrant would have been entitled under the provisions of the agreement
 in such merger or consolidation if this Warrant had been exercised immediately
 before that merger or consolidation. In any such case, appropriate adjustment
 (as determined in good faith by the Company's Board of Directors) shall be made
 in the application of the provisions of this Warrant with respect to the rights
 and interests of the Registered Holder after the merger or consolidation to the
 end that the provisions of this Warrant (including adjustment of the Purchase
 Price then in effect and the number of shares of Warrant Stock) shall be
 applicable after that event, as near as reasonably may be, in relation to any
 shares or other property deliverable after that event upon exercise of this
 Warrant.
         (b) SPLITS, SUBDIVISIONS AND DIVIDENDS. In the event the Company should
 at any time or from time to time fix a record date for the effectuation of a
 split or subdivision of the outstanding shares of Common Stock or the
 determination of the holders of Common Stock entitled to receive a dividend or
 other distribution payable in additional shares of Common Stock or other
 securities or rights convertible into, or entitling the holder thereof to
 receive directly or indirectly, additional shares of Common Stock (hereinafter
 referred to as the "Common Stock Equivalents") without payment of any
 consideration by such holder for the additional shares of Common Stock or
 Common Stock Equivalents (including the additional shares of Common Stock
 issuable upon conversion or exercise thereof), then, as of such record date (or
 the date of such distribution, split or subdivision if no record date is
 fixed), the per share Purchase Price shall be appropriately decreased and the
 number of shares of Warrant Stock shall be appropriately increased in
 proportion to such increase (or potential increase) of outstanding shares.
         (c) COMBINATION OF SHARES. If the number of shares of Common Stock
 outstanding at any time after the date hereof is decreased by a combination of
 the outstanding shares of Common Stock, the per share Purchase Price shall be
 appropriately increased and the number of shares of Warrant Stock shall be
 appropriately decreased in proportion to such decrease in outstanding shares.
         (d) ADJUSTMENT CERTIFICATE. When any adjustment is required to be made
 in the securities issuable upon exercise of this Warrant, the Company shall
 mail to the Registered Holder a certificate setting forth a statement of the
 facts requiring such adjustment. Such certificate shall also set forth the kind
 and amount of stock or other securities or property into which this Warrant
 shall be exercisable following the occurrence of any of the events specified in
 this Section 2.
     3.  TRANSFER RESTRICTIONS; REPRESENTATIONS.
         (a) The Registered Holder of this Warrant acknowledges that this
Warrant and the Warrant Stock have not been registered under the Securities Act,
and agrees not to sell, pledge, distribute, offer for sale, transfer or
otherwise dispose of this Warrant or any Warrant Stock issued upon its exercise
in the absence of (i) an effective registration statement under the Securities
Act as to this Warrant or such Warrant Stock and registration or qualification
of this Warrant or such Warrant Stock or (ii) an opinion of counsel, reasonably
satisfactory to the Company, that such registration and qualification are not
required. This Warrant is not transferable without the prior written consent of
the Company. It is understood and agreed that this provision does not apply to,
or limit the sale, pledge, distribution, offers for sale, transfer or other
disposition of Warrant Stock after any exercise thereof pursuant to Section 1
hereof.
         Not withstanding the foregoing, the Registered Holder has a right to
request registration of this Warrant and the Warrant Stock under the Securities
Act. The Company will, in any event, have a registration statement in effect
covering the Warrant and the Warrant Stock by the 5th anniversary of the
Issuance Date of the Warrant.
         (b) The Registered Holder hereby further represents and warrants to the
Company with respect to the issuance of the Warrant and the purchase of the
Warrant Stock as follows:
                  (i) PURCHASE ENTIRELY FOR OWN ACCOUNT. This Warrant is issued
 to the Registered Holder in reliance upon such Registered Holder's
 representation to the Company, which by such Registered Holder's execution of
 this Warrant such Registered Holder hereby confirms, that the Warrant and the
 Warrant Stock will be acquired for investment for such Registered Holder's own
 account, not as a nominee or agent, and not with a view to the resale or
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 distribution of any part thereof, and that such Registered Holder has no
 present intention of selling, granting any participation in, or otherwise
 distributing the same.
                  (ii) KNOWLEDGE AND EXPERIENCE; ABILITY TO BEAR ECONOMIC RISKS.
 The Registered Holder has such knowledge and experience in financial and
 business matters that it is capable of evaluating the merits and risks of the
 investment contemplated by this Warrant and such party is able to bear the
 economic risk of its investment in the Company (including a complete loss of
 its investment). The Registered Holder is and will continue to be an
 "accredited investor" as defined by Rule 501 of the Securities Act.
                  (iii) RESALE. The Registered Holder understands that the
 Warrant being issued hereunder and the Warrant Stock to be purchased hereunder
 are characterized as "restricted securities" under the federal securities laws
 inasmuch as they are being acquired from the Company in a transaction not
 involving a public offering and that under such laws and applicable
 regulations, such securities may be resold without registration under the
 Securities Act only in certain circumstances. In this regard, the Registered
 Holder represents that it is familiar with Rule 144 under the Securities Act,
 and understands the resale limitations imposed thereby and by the Securities
 Act.
                  (iv) LEGENDS. The Registered Holder acknowledges that all
 stock certificates representing shares of stock issued to the Registered Holder
 upon exercise of this Warrant may, if such Warrant Stock is not registered
 under the Securities Act, have affixed thereto a legend substantially in the
 following form:
                           (x) "THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AS AMENDED (THE
"SECURITIES ACT"), OR ANY STATE SECURITIES LAWS. THEY MAY NOT BE SOLD, OFFERED
FOR SALE, PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED IN THE ABSENCE OF A
REGISTRATION STATEMENT IN EFFECT WITH RESPECT TO THE SECURITIES UNDER SUCH
SECURITIES ACT OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH
REGISTRATION IS NOT REQUIRED OR UNLESS SOLD PURSUANT TO AN EXEMPTION TO SUCH
SECURITIES ACT."
                           (y) Any legend required by the laws of any state in
which the securities will be issued.
         (c) Subject to the provisions of Section 3(a) hereof, this Warrant and
 all rights hereunder are transferable in whole or in part upon surrender of the
 Warrant with a properly executed assignment (in the form of Exhibit B hereto)
 at the principal office of the Company.
         (d) The Company will maintain a register containing the names and
 addresses of the Registered Holder(s) of this Warrant. Any Registered Holder
 may change such Registered Holder's address as shown on the warrant register by
 written notice to the Company requesting such change.
         (f) The Company hereby represents and warrants to the Registered Holder
 as follows:
                  (i) The Company is a corporation validly existing and in good
standing under the laws of the State of Delaware.
                  (ii) The Company has requisite corporate right, power and
 authority (including the due authorization by all necessary corporate action)
 to enter into this Warrant and to perform its obligations hereunder without the
 need for the consent of any other person; and this Warrant has been duly
 authorized, executed and delivered and constitutes legal, valid and binding
 obligations of the Company enforceable against it in accordance with the terms
 hereof. The execution, delivery and performance of this Warrant by the Company
 do not contravene or violate any laws, rules or regulations applicable to it.
                  (iii) The Company has taken such corporate action as is
 necessary or appropriate to enable it to perform its obligations hereunder,
 including, but not limited to, the issuance, sale and delivery of the Warrant.
                  (iv) The Warrant Stock, when issued and paid for in compliance
 with the provisions of this Warrant, will be validly issued, fully paid and
 non-assessable.
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     4. NO IMPAIRMENT. The Company will not, by amendment of its charter or
 through reorganization, consolidation, merger, dissolution, sale of assets or
 any other voluntary action, avoid or seek to avoid the observance or
 performance of any of the terms of this Warrant, but will assist in the
 carrying out of all such terms and in the taking of all such action as may be
 necessary or appropriate in order to fulfill its obligations hereunder.
     5. TERMINATION. This Warrant (and the right to purchase securities upon
 exercise hereof) shall terminate upon the tenth anniversary of the Date of
 Issuance (the "Expiration Date").
     6. NOTICES OF CERTAIN TRANSACTIONS. In the event that:
         (a) the Company shall take a record of the holders of its Common Stock
 (or other stock or securities at the time deliverable upon the exercise of this
 Warrant) for the purpose of entitling or enabling them to receive any dividend
 or other distribution, or any right to subscribe for, purchase or otherwise
 acquire any shares of stock of any class or any other securities or property,
 or to receive any other right; or
         (b) the Company shall effect any consolidation or merger of the Company
 with or into another corporation (other than a consolidation or merger in which
 the Company is the surviving entity), or any transfer of all or substantially
 all of the assets of the Company, or
         (c) the Company voluntarily or involuntarily dissolves, liquidates or
 winds-up its business or affairs, then, and in each such case, the Company will
 mail or cause to be mailed to the Registered Holder of this Warrant a notice
 specifying, as the case may be, (i) the date on which a record is to be taken
 for the purpose of such dividend, distribution or right, and stating the amount
 and character of such dividend, distribution or right, and (ii) the effective
 date on which such reorganization, reclassification, consolidation, merger,
 transfer, dissolution, liquidation or winding-up is expected to take place, and
 the record date for determining shareholders entitled to vote thereon. Such
 notice shall be mailed at least ten (10) calendar days prior to the record date
 or effective date for the event specified in such notice.
     7. RESERVATION OF STOCK. The Company shall at all times reserve and keep
 available, solely for the issuance and delivery upon the exercise of this
 Warrant, such shares of Warrant Stock or other stock or securities, as from
 time to time shall be issuable upon the exercise of this Warrant.
     8. EXCHANGE OF WARRANTS. Upon the surrender by the Registered Holder of any
 Warrant, properly endorsed, to the Company at the principal office of the
 Company, the Company will, subject to the provisions of Section 3(a) hereof,
 issue and deliver, at the Company's expense, a new warrant in a form
 substantially similar to this Warrant, in the name of such Registered Holder or
 as such Registered Holder (upon payment by such Registered Holder of any
 applicable transfer taxes) may direct, calling in the aggregate on the face
 thereof for the number of shares of Common Stock called for on the face of the
 Warrant so surrendered.
     9. REPLACEMENT OF WARRANTS. Upon receipt of evidence reasonably
 satisfactory to the Company of the loss, theft, destruction or mutilation of
 this Warrant and, in the case of loss, theft or destruction, upon delivery of
 an indemnity agreement, with surety if reasonably required, in an amount
 reasonably satisfactory to the Company, or, in the case of mutilation, upon
 surrender and cancellation of this Warrant, the Company will issue, in lieu
 thereof, a new warrant in a form substantially similar to this Warrant.
     10. MAILING OF NOTICES. Any notice required or permitted by this Warrant
 shall be in writing and shall be deemed sufficient upon receipt, when delivered
 personally or by a nationally-recognized delivery service (such as Federal
 Express or UPS) or confirmed facsimile, or forty-eight (48) hours after being
 deposited in the U.S. mail as certified or registered mail with postage
 prepaid, if such notice is addressed to the party to be notified at such
 party's address or facsimile number as set forth below or as subsequently
 modified by written notice.
     11. NO RIGHTS AS STOCKHOLDER. Until the exercise of this Warrant, the
 Registered Holder of this Warrant shall not have or exercise any rights by
 virtue hereof as a stockholder of the Company (including without limitation the
 right to notification of stockholder meetings or the right to receive any
 notice or other communication concerning the business or affairs of the
 Company).
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     12. AMENDMENT OR WAIVER. Any term of this Warrant may be amended or waived
 only by an instrument in writing signed by the party against which enforcement
 of the amendment or waiver is sought.
     13. HEADINGS. The headings in this Warrant are for purposes of reference
 only and shall not limit or otherwise affect the meaning of any provision of
 this Warrant.
     14. SUCCESSORS AND ASSIGNS. The terms and provisions of this Warrant shall
 inure to the benefit of, and be binding upon, the Company and the Registered
 Holder and their respective permitted successors and assigns (in the case of
 the Registered Holder, in accordance with Section 3(a) hereof).
     16. GOVERNING LAW. This Warrant shall be governed, construed and
 interpreted in accordance with the laws of the State of California, without
 giving effect to principles of conflicts of law thereof.
GERON CORPORATION                        REGISTERED HOLDER
By:    /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇            Signature:
       ----------------------
Name:      ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇▇            Name:
Title:     Chief Financial Officer       Title:
Address:   Geron Corporation             Address:    ▇▇▇▇▇▇▇ & Company
           ▇▇▇ ▇▇▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇                    ▇▇▇ ▇▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇
           ▇▇▇▇▇ ▇▇▇▇, ▇▇ ▇▇▇▇▇                      ▇▇▇▇▇ ▇▇▇▇
                                                     ▇▇▇ ▇▇▇▇▇▇▇▇▇, ▇▇ ▇▇▇▇▇
Dated:     March 12, 2003                Dated:
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                                    EXHIBIT A
                                  PURCHASE FORM
 To:     GERON CORPORATION
 Date:   ___________________
          The undersigned, pursuant to the provisions set forth in the attached
 Warrant, hereby irrevocably elects to purchase shares of the Common Stock
 covered by such Warrant and herewith makes payment of $___________,
 representing the full purchase price for such shares at the price per share
 provided for in such Warrant.
          The undersigned hereby affirms and acknowledges the investment
 representations and warranties made in the Warrant are true and correct as of
 the date hereof, and accepts such shares subject to the restrictions of the
 Warrant, copies of which are available from the Secretary of the Company.
 Signature:  _______________________________________
 Name:
 Title:
 Address:
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                                    EXHIBIT B
                                 ASSIGNMENT FORM
FOR VALUE RECEIVED, ____________________ hereby sells, assigns and
transfers all of the rights of the undersigned under the attached Warrant with
respect to the number of shares of Common Stock covered thereby set forth below,
unto:
 NAME OF ASSIGNEE                 ADDRESS                         No. OF SHARES
 Signature:  _______________________________________
 Witness:  ________________________________________
 Dated:  _____________________
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