Document:

EXHIBIT 4.2

                         COMMON STOCK PURCHASE AGREEMENT

     THIS COMMON STOCK PURCHASE AGREEMENT ("Agreement") is made and entered into
as  of  November  21,  2007  (the  "Effective   Date"),  by  and  between  GERON
CORPORATION,  a Delaware  corporation  having its principal place of business at
230  Constitution  Drive,  Menlo Park,  California  94025  ("Geron"),  and Lonza
Walkersville,  Inc.,  a  Delaware  corporation  having  its  principal  place of
business  at 8830 Biggs  Ford  Road,  Walkersville,  Maryland  21793  ("Lonza").
Capitalized  terms not otherwise defined herein shall have the meaning set forth
in the MSA and Project Order No. 1.

          A.   Geron and Cambrex Bio Science Walkersville, Inc. ("CBSW") entered
               that certain Master Services Agreement,  dated as of September 1,
               2005 (the  "MSA"),  pursuant  to which  CBSW  agreed  to  perform
               certain services on behalf of Geron related to the manufacture of
               a product  containing human cells intended for therapeutic use in
               humans on the terms set forth therein.

          B.   Geron and CBSW entered  into Project  Order No. 1 to the MSA (the
               "Project Order No. 1") effective  September 1, 2005,  pursuant to
               which Geron is entitled,  subject to certain  conditions,  to pay
               any  compensation  owed  to CBSW  for  Services  performed  under
               Project  Order No. 1 either in cash or in  Geron's  common  stock
               (the "Common Stock").

          C.   Subject to the terms and  conditions  of the Second  Amendment to
               Project  Order No.1,  dated as of March 1, 2006  ("Amendment  No.
               2"),  Geron and CBSW agreed that Geron shall,  subject to certain
               conditions,  be entitled to pay up to  US$4,500,000  for Services
               under Project Order No. 1 by delivery of Shares.

          D.   Effective  February 6, 2007,  Lonza  completed its acquisition of
               CBSW,  and assumed all rights and  obligations  of CBSW under the
               MSA and Project Order No. 1, as amended.

          E.   Subject to the terms and  conditions  of the Sixth  Amendment  to
               Project Order No.1, dated as of November 9, 2007, Geron and Lonza
               have agreed that Geron shall,  subject to certain conditions,  be
               entitled to pay an  additional  US$4,000,000  for Services  under
               Project Order No. 1 by delivery of Shares, for an aggregate total
               of up to US$8,500,000 payable in Stock.

THE PARTIES AGREE AS FOLLOWS:

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     1. ISSUANCE OF SHARES; ADJUSTMENTS.

          1.1  As payment of the fifth Installment  Payment specified in Project
               Order No.  1,  Geron  will  issue and  deliver  certificates  for
               147,493 shares of Common Stock (the "Shares").  Upon issuance and
               delivery of the  certificate(s)  for the Shares, all Shares shall
               be duly  authorized and validly  issued and represent  fully paid
               shares of Geron's Common Stock.

     2. CLOSING; DELIVERY.

          2.1  The   consummation  of  the  transaction   contemplated  by  this
               Agreement (a  "Closing")  shall be held at such time and place as
               is mutually agreed upon between the parties,  but in any event no
               later than five (5)  business  days after the  Effective  Date of
               this Agreement (the "Closing Date"). At the Closing,  Geron shall
               deliver to Lonza one or more certificates representing all of the
               Shares,  which Shares shall be issued in the name of Lonza or its
               designee and in such denominations as Lonza shall specify.

          2.2  Geron's obligations to issue and deliver the stock certificate(s)
               representing  the Shares to Lonza at the Closing shall be subject
               to the following conditions, which may be waived by Geron:

               2.2.1 the  covenants  and  obligations  that Lonza is required to
                    perform or to comply with pursuant to this Agreement,  at or
                    prior to the  Closing,  must have been  duly  performed  and
                    complied with in all material respects; and

               2.2.2 the  representations  and  warranties  made by Lonza herein
                    shall be true and correct in all material respects as of the
                    Closing Date.

          2.3  Lonza's obligation to accept delivery of the stock certificate(s)
               representing  the Shares at the  Closing  shall be subject to the
               following  conditions,  any one or more of which may be waived by
               Lonza:

               2.3.1 the  covenants  and  obligations  that Geron is required to
                    perform or to comply with pursuant to this Agreement,  at or
                    prior to the  Closing,  must have been  duly  performed  and
                    complied with in all material respects;

               2.3.2 Geron  shall  have  available   under  its  Certificate  of
                    Incorporation  sufficient  authorized shares of Common Stock
                    to issue the Shares to Lonza; and

               2.3.3 the  representations  and  warranties  made by Geron herein
                    shall be true and correct in all material respects as of the
                    Closing Date.

     3. RESTRICTIONS ON RESALE OF SHARES.

          3.1  Legends.  Lonza  understands and acknowledges that the Shares are
               not registered under the Securities Act of 1933 (the "Act"),  and
               that  under  the Act  and  other  applicable  laws  Lonza  may be
               required  to hold such Shares for an  indefinite  period of time.
               Each  stock  certificate   representing  Shares  shall  bear  the
               following legends:

               "THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER
                THE  SECURITIES  ACT OF 1933,  AS    AMENDED  (THE  "ACT").  ANY
                TRANSFER  OF  SUCH    SECURITIES  SHALL  BE  INVALID  UNLESS  A
                REGISTRATION  STATEMENT    UNDER THE ACT IS IN EFFECT AS TO SUCH
                TRANSFER OR,  IN THE  OPINION OF COUNSEL   REASONABLY ACCEPTABLE
                TO GERON,  SUCH REGISTRATION  IS  UNNECESSARY FOR  SUCH TRANSFER
                TO  COMPLY  WITH  THE  ACT. THE  SECURITIES  REPRESENTED  HEREBY
                ARE   SUBJECT  TO THE  TERMS   OF THE  COMMON    STOCK  PURCHASE
                AGREEMENT   BY AND BETWEEN GERON   AND LONZA, DATED NOVEMBER 21,
                2007.   A  COPY  OF THE   AGREEMENT  CAN BE  OBTAINED  FROM  THE
                SECRETARY OF GERON."

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          3.2  Limits on Sales.  Lonza  agrees that if it decides to resell some
               or all of the Shares, it will do so only in an appropriate manner
               through orderly sales executed through a top-tier brokerage firm,
               and based upon whether the shares are registered or unregistered,
               i.e., on the Nasdaq  National  Market or in a Rule 144A compliant
               transaction.

          3.3  Further Limitations.  Geron shall not be required (i) to transfer
               on its  books  any  Shares  that  have  been  sold  or  otherwise
               transferred  in  violation  of  any  of the  provisions  of  this
               Agreement  or  applicable  securities  laws;  or (ii) to treat as
               owner  of such  Shares  or to  accord  the  right  to vote or pay
               dividends  to any  purchaser  or other  transferee  to whom  such
               Shares shall have been so  transferred in violation of any of the
               provisions of this Agreement or applicable securities laws.

     4. REGISTRATION RIGHTS

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          4.1  Geron agrees to make commercially reasonable efforts to file with
               the Securities and Exchange Commission (the "Commission")  within
               ten (10)  business  days after the Closing  Date, a  registration
               statement under the Act (the "Registration  Statement"),  on Form
               S-3 or other appropriate form, so as to permit a non-underwritten
               public  offering and resale of the Shares under the Act by Lonza.
               Geron  agrees  to  diligently   pursue  making  the  Registration
               Statement  effective.  Geron  will make  commercially  reasonable
               efforts to notify Lonza of the  effectiveness of the Registration
               Statement  within one (1) business  day of receiving  notice from
               the Commission  declaring the Registration  Statement  effective,
               but no later  than the close of  business  (Pacific  Time) of the
               second  business  day  after  receipt  of such  notice  from  the
               Commission.

          4.2  Geron  shall  notify  Lonza as promptly as possible of any review
               initiated by the Commission with respect to any such Registration
               Statement.

          4.3  Geron  will   maintain  the   Registration   Statement   and  any
               post-effective  amendment  thereto  filed  under  this  Section 4
               effective  under the Act until the  earliest of (i) the date that
               none of the Shares  covered by such  Registration  Statement  are
               issued and outstanding, (ii) the date that all of the Shares have
               been sold pursuant to such Registration Statement, (iii) the date
               Lonza  receives  an opinion of  counsel to Geron,  which  counsel
               shall be reasonably  acceptable to Lonza,  that the Shares may be
               sold  under the  provisions  of Rule 144,  (iv) the date that all
               Shares have been  otherwise  transferred to persons who may trade
               such  shares  without  restriction  under the Act,  and Geron has
               delivered a new  certificate  or other  evidence of ownership for
               such securities not bearing a restrictive legend, or (v) the date
               all Shares may be sold at any time pursuant to Rule 144(k) or any
               similar  provision then in effect under the Act in the opinion of
               counsel to Geron, which counsel shall be reasonably acceptable to
               Lonza.

          4.4  Geron, at its expense, shall furnish to Lonza with respect to the
               Shares   registered   under  the   Registration   Statement  such
               reasonable  number  of  copies  of  the  Registration  Statement,
               prospectuses and preliminary  prospectuses in conformity with the
               requirements  of the Act and such  other  documents  as Lonza may
               reasonably  request,  in order to  facilitate  the public sale or
               other disposition of all or any of the Shares by Lonza, provided,
               however,  that  the  obligation  of Geron to  deliver  copies  of
               prospectuses  or  preliminary  prospectuses  to  Lonza  shall  be
               subject to the  receipt by Geron of  reasonable  assurances  from
               Lonza that Lonza will comply with the  applicable  provisions  of
               the Act and of such other  securities  or blue sky laws as may be
               applicable in  connection  with any use of such  prospectuses  or
               preliminary prospectuses.

          4.5  All fees,  disbursements  and  out-of-pocket  expenses  and costs
               incurred by Geron in connection  with the  preparation and filing
               of the Registration  Statement under Section 4.1 and in complying
               with applicable securities and Blue Sky laws (including,  without
               limitation,  all  attorneys'  fees of  Geron)  shall  be borne by
               Geron.  Lonza  shall  bear the cost of all fees and  expenses  of
               Lonza's counsel.

          4.6  Geron will advise Lonza promptly after it shall receive notice or
               obtain  knowledge  of the  issuance  of  any  stop  order  by the
               Commission  delaying  or  suspending  the  effectiveness  of  the
               Registration Statement or of the initiation of any proceeding for
               that  purpose,  and Geron  will use its  commercially  reasonable
               efforts to prevent  the  issuance  of any stop order or to obtain
               its  withdrawal as promptly as possible if such stop order should
               be issued.

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          4.7  With a view to making available to Lonza the benefits of Rule 144
               (or its  successor  rule) and any other rule or regulation of the
               Commission  that may at the time permit  Lonza to sell the Shares
               to the public without  registration,  Geron  covenants and agrees
               to:  (i) make and keep  public  information  available,  as those
               terms are  understood and defined in Rule 144, until the earliest
               of (A) such date as all of the Shares may be resold  pursuant  to
               Rule 144(k) or any other rule of similar  effect or (B) such date
               as all of the Shares shall have been  resold;  and (ii) file with
               the Commission in a timely manner all reports and other documents
               required  of Geron  under the Act and under the  Exchange  Act of
               1934, as amended.

          4.8  Lonza will  cooperate  with Geron in all  respects in  connection
               with this Agreement,  including  timely supplying all information
               reasonably   requested  by  Geron   (which   shall   include  all
               information  regarding  Lonza and proposed  manner of sale of the
               Shares  required to be disclosed in any  Registration  Statement)
               and executing and returning all documents reasonably requested in
               connection  with  the  registration  and sale of the  Shares  and
               entering  into  and  performing  their   obligations   under  any
               underwriting  agreement,  if  the  offering  is  an  underwritten
               offering,   in  usual  and  customary  form,  with  the  managing
               underwriter  or  underwriters  of  such  underwritten   offering.
               Nothing in this  Agreement  shall obligate Lonza to consent to be
               named as an underwriter in any Registration Statement.

     5. INDEMNIFICATION.

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          5.1  Geron  agrees to  indemnify  and hold  harmless  Lonza  (and each
               person,  if any, who controls Lonza within the meaning of Section
               15 of the Act, and each  officer and  director of Lonza)  against
               any and all losses, claims, damages or liabilities (or actions or
               proceedings in respect  thereof),  joint or several,  directly or
               indirectly  based upon or arising out of (i) any untrue statement
               or alleged untrue statement of any material fact contained in the
               Registration  Statement,   any  preliminary   prospectus,   final
               prospectus  or summary  prospectus  contained  therein or used in
               connection  with the offering of the Shares,  or any amendment or
               supplement  thereto,  or (ii) any omission or alleged omission to
               state a material fact required to be stated  therein or necessary
               to make the  statements  therein not  misleading;  and Geron will
               reimburse each such indemnified  party for any legal or any other
               expenses   reasonably   incurred  by  them  in  connection   with
               investigating,  preparing,  pursuing or defending  any such loss,
               claim, damage, liability, action or proceeding, except insofar as
               any such loss, claim, damage,  liability,  action,  proceeding or
               expense arises out of or is based upon (A) an untrue statement or
               alleged untrue  statement or omission or alleged omission made in
               the  Registration  Statement,  any such  preliminary  prospectus,
               final prospectus, summary prospectus,  amendment or supplement in
               reliance  upon  and  in  conformity   with  written   information
               furnished to Geron by or on behalf of Lonza  expressly for use in
               the preparation  thereof, (B) the failure of Lonza to comply with
               its covenants and  agreements  contained in Sections 7.1 or 7.5.2
               hereof or (C) any misstatement or omission in any prospectus that
               is corrected in any subsequent  prospectus  that was delivered to
               Lonza  prior  to the  pertinent  sale or  sales  by  Lonza.  Such
               indemnity  shall remain in full force and effect,  regardless  of
               any  investigation  made  by such  indemnified  party  and  shall
               survive the transfer of the Shares by Lonza.

          5.2  Lonza  agrees to  indemnify  and hold  harmless  Geron  (and each
               person,  if any, who controls Geron within the meaning of Section
               15 of the Act,  and each  officer and director of Geron) from and
               against  losses,  claims,  damages or liabilities  (or actions or
               proceedings in respect  thereof),  joint or several,  directly or
               indirectly based upon or arising out of, (i) any failure of Lonza
               to comply with the covenants and agreements contained in Sections
               7.1 and 7.5.2  hereof or (ii) any untrue  statement of a material
               fact contained in the Registration Statement or any omission of a
               material fact required to be stated in the Registration Statement
               or necessary in order to make the statements in the  Registration
               Statement not misleading if such untrue statement or omission was
               made in reliance upon and in conformity with written  information
               furnished to Geron by or on behalf of Lonza  specifically for use
               in preparation of the Registration Statement;  provided, however,
               that  Lonza  shall  not be  liable  in any such  case for (A) any
               untrue  statement  or  omission  in the  Registration  Statement,
               prospectus,  or other such document which  statement is corrected
               by Lonza and delivered to Geron prior to the sale from which such
               loss  occurred,  (B) any  untrue  statement  or  omission  in any
               prospectus   which  is  corrected  by  Lonza  in  any  subsequent
               prospectus,  or supplement or amendment thereto, and delivered to
               Geron  prior to the sale or sales from which a loss or  liability
               arose,  or  (C)  any  failure  by  Geron  to  fulfill  any of its
               obligations under Section 5.1 hereof.

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          5.3  Promptly after receipt by any indemnified person of a notice of a
               claim  or the  beginning  of  any  action  in  respect  of  which
               indemnity is to be sought against an indemnifying person pursuant
               to this  Section  5, such  indemnified  person  shall  notify the
               indemnifying   person  in   writing  of  such  claim  or  of  the
               commencement  of such  action,  but the omission to so notify the
               indemnifying  party will not relieve it from any liability  which
               it may have to any indemnified party under this Section 5 (except
               to the extent that such omission materially and adversely affects
               the  indemnifying  party's ability to defend such action) or from
               any liability otherwise than under this Section 5. Subject to the
               provisions  hereinafter  stated, in case any such action shall be
               brought against an indemnified  person,  the indemnifying  person
               shall be entitled to participate therein, and, to the extent that
               it shall elect by written  notice  delivered  to the  indemnified
               party  promptly  after  receiving the aforesaid  notice from such
               indemnified  party,  shall be  entitled  to  assume  the  defense
               thereof, with counsel reasonably satisfactory to such indemnified
               person.  After  notice  from  the  indemnifying  person  to  such
               indemnified person of its election to assume the defense thereof,
               such indemnifying  person shall not be liable to such indemnified
               person  for  any  legal  expense  subsequently  incurred  by such
               indemnified  person  in  connection  with  the  defense  thereof,
               provided, however, that if there exists or shall exist a conflict
               of  interest  that would make  inappropriate,  in the  reasonable
               opinion  of  counsel  to the  indemnified  person,  for the  same
               counsel  to  represent  both  the  indemnified  person  and  such
               indemnifying  person or any affiliate or associate  thereof,  the
               indemnified person shall be entitled to retain its own counsel at
               the expense of such indemnifying person; provided,  however, that
               no  indemnifying  person  shall be  responsible  for the fees and
               expenses  of  more  than  one  separate  counsel  (together  with
               appropriate  local counsel) for all  indemnified  parties.  In no
               event shall any  indemnifying  person be liable in respect to any
               amounts paid in settlement of any action unless the  indemnifying
               person  shall  have  approved  the terms of such  settlement.  No
               indemnifying  person shall,  without the prior written consent of
               the indemnified  person,  effect any settlement of any pending or
               threatened  proceeding in respect of which any indemnified person
               is a party,  unless such  settlement  includes  an  unconditional
               release of such  indemnified  person from all liability on claims
               that are the subject matter of such proceeding.

          5.4  The provisions of this Section 5 shall survive the termination of
               this Agreement.

     6. REPRESENTATIONS AND ACKNOWLEDGEMENT OF GERON.

          Geron hereby represents, warrants and covenants to Lonza as follow:

          6.1  Organization,  Good  Standing  and  Qualification.   Geron  is  a
               corporation duly organized, validly existing and in good standing
               under the laws of the  State of  Delaware  and has all  requisite
               corporate  power and  authority  to carry on its  business as now
               conducted  and as presently  proposed to be  conducted.  Geron is
               duly qualified to transact  business and is in good standing as a
               foreign  corporation in each jurisdiction in which the failure to
               so qualify would have a material  adverse  effect on its business
               or properties.

          6.2  Authorization.   Geron  has  full  right,  power,  authority  and
               capacity  to enter  into this  Agreement  and to  consummate  the
               transactions  contemplated  hereby and  thereby and has taken all
               necessary  action  to  authorize  the  execution,   delivery  and
               performance of this Agreement.  Upon execution and delivery, this
               Agreement will constitute a valid and binding obligation of Geron
               enforceable against Geron in accordance with its terms, except as
               such  enforceability  may be  limited by  applicable  bankruptcy,
               insolvency,  reorganization,   moratorium,  fraudulent  transfer,
               liquidation or similar laws relating to, or affecting  generally,
               the  enforcement  of  creditor's  rights and remedies or by other
               equitable  principles of general application from time to time in
               effect.

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          6.3  Valid Issuance of Common Stock. The Shares, when issued, sold and
               delivered   in   accordance   with  the  terms   hereof  for  the
               consideration   expressed  herein,   will  be  duly  and  validly
               authorized and issued,  fully paid and  nonassessable and free of
               restrictions  on  transfer  other than  restrictions  on transfer
               under this Agreement and applicable state and federal  securities
               laws.

          6.4  Legal  Proceedings  and  Orders.   There  is  no  action,   suit,
               proceeding or investigation  pending or threatened  against Geron
               that  questions  the  validity of this  Agreement or the right of
               Geron  to  enter  into  this   Agreement  or  to  consummate  the
               transactions contemplated hereby, nor is Geron aware of any basis
               for any of the foregoing. Geron is neither a party nor subject to
               the provisions of any order, writ, injunction, judgment or decree
               of any court or government agency or  instrumentality  that would
               affect the  ability of Geron to enter into this  Agreement  or to
               consummate the transactions contemplated hereby.

     7. REPRESENTATIONS AND ACKNOWLEDGMENTS OF LONZA.

          Lonza hereby represents, warrants, acknowledges and agrees that:

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          7.1  Investment.  Lonza  is  acquiring  the  Shares  for  Lonza's  own
               account,  and not directly or  indirectly  for the account of any
               other person.  Lonza is acquiring the Shares for  investment  and
               not with a view to  distribution  or  resale  thereof,  except in
               compliance  with the Act and any applicable  state law regulating
               securities.

          7.2  Access to Information. Lonza has consulted with its own attorney,
               accountant,  or investment  advisor as Lonza has deemed advisable
               with respect to the investment and has determined its suitability
               for Lonza. Lonza has had the opportunity to ask questions of, and
               to receive answers from,  appropriate executive officers of Geron
               with  respect  to the terms and  conditions  of the  transactions
               contemplated  hereby and with respect to the  business,  affairs,
               financial  condition  and  results  of  operations  of Geron.  In
               connection with the transactions  contemplated  hereunder,  Geron
               may disclose to Lonza information which may constitute  material,
               non-public  information  regarding  Geron,  and  Lonza  agrees to
               maintain in confidence any such information;  provided,  however,
               such  information  shall not include  information  (a) that is or
               becomes  part of the  public  domain,  (b)  that  was in  Lonza's
               possession without any obligation of confidentiality prior to the
               date Geron  disclosed such  information to Lonza,  or (c) that is
               supplied  to Lonza by a third  party  which is not subject to any
               restriction of confidentiality  or non-disclosure.  Lonza has had
               access to such financial and other information as is necessary in
               order  for  Lonza  to  make  a  fully  informed  decision  as  to
               investment in Geron,  and has had the  opportunity  to obtain any
               additional   information   necessary   to  verify   any  of  such
               information  to which  Lonza has had access.  Lonza  acknowledges
               that neither Geron nor any of its officers, directors, employees,
               agents, representatives, or advisors have made any representation
               or warranty other than those specifically expressed herein.

          7.3  Business and Financial  Expertise.  Lonza further  represents and
               warrants that it has such  business or financial  expertise as to
               be able to evaluate its  investment  in Geron and purchase of the
               Shares.

          7.4  Speculative Investment. Lonza acknowledges that the investment in
               Geron  represented by the Shares is highly  speculative in nature
               and is  subject  to a high  degree of risk of loss in whole or in
               part;  the  amount  of such  investment  is within  Lonza's  risk
               capital  means and is not so great in relation  to Lonza's  total
               financial  resources as would  jeopardize the personal  financial
               needs of Lonza in the event such investment were lost in whole or
               in part.

          7.5  Unregistered Securities. Lonza acknowledges that:

                    7.5.1 Lonza must bear the economic risk of investment for an
                         indefinite  period of time  because the Shares have not
                         been registered  under the Act and therefore cannot and
                         will  not  be  sold   unless   they  are   subsequently
                         registered  under  the Act or an  exemption  from  such
                         registration   is   available.   Geron   has   made  no
                         agreements,  covenants or  undertakings  whatsoever  to
                         register  any of the  Shares  under the Act,  except as
                         provided  in  Section  4  above.   Geron  has  made  no
                         representations,  warranties or covenants whatsoever as
                         to  whether  any  exemption  from the  Act,  including,
                         without limitation,  any exemption for limited sales in
                         routine  brokers'  transactions  pursuant  to Rule  144
                         under  the  Act,  will  become   available.   Any  such
                         exemption  pursuant to Rule 144, if  available  at all,
                         will not be  available  unless:  (i) a  public  trading
                         market then exists in Geron's Common Stock,  (ii) Geron
                         has complied with the information  requirements of Rule
                         144, and (iii) all other terms and  conditions  of Rule
                         144 have been satisfied.

                    7.5.2 Transfer  of the  Shares  has not been  registered  or
                         qualified  under any  applicable  state law  regulating
                         securities and,  therefore,  the Shares cannot and will
                         not be sold unless they are subsequently  registered or
                         qualified under any such act or an exemption  therefrom
                         is available.  Geron has made no agreements,  covenants
                         or  undertakings  whatsoever to register or qualify any
                         of the  Shares  under any such  act.  Geron has made no
                         representations,  warranties or covenants whatsoever as
                         to whether any exemption  from any such act will become
                         available.

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                    7.5.3 Lonza  hereby  certifies  that  it is  an  "Accredited
                         Investor" as that term is defined in Rule 501 under the
                         Act.

          7.6  Authorization.   Lonza  has  full  right,  power,  authority  and
               capacity  to enter  into this  Agreement  and to  consummate  the
               transactions  contemplated  hereby and  thereby and has taken all
               necessary  action  to  authorize  the  execution,   delivery  and
               performance of this Agreement.  Upon execution and delivery, this
               Agreement will constitute a valid and binding obligation of Lonza
               enforceable against Lonza in accordance with its terms, except as
               such  enforceability  may be  limited by  applicable  bankruptcy,
               insolvency,  reorganization,   moratorium,  fraudulent  transfer,
               liquidation or similar laws relating to, or affecting  generally,
               the  enforcement  of  creditor's  rights and remedies or by other
               equitable  principles of general application from time to time in
               effect.

     8.   TAX ADVICE.  Lonza acknowledges that Lonza has not relied and will not
          rely  upon  Geron  or  Geron's   counsel   with  respect  to  any  tax
          consequences related to the ownership, purchase, or disposition of the
          Shares.  Lonza assumes full  responsibility  for all such consequences
          and for the  preparation  and filing of all tax returns and  elections
          which may or must be filed in connection with the Shares.

     9.   NOTICES.  Any  notice or other  communication  required  or  permitted
          hereunder  shall be in  writing  and shall be deemed to have been duly
          given on the date of delivery if delivered personally or by facsimile,
          or one day, not including  Saturdays,  Sundays,  or national holidays,
          after sending if sent by national overnight delivery service,  or five
          days, not including  Saturdays,  Sundays, or national holidays,  after
          mailing if mailed by first class  United  States  mail,  certified  or
          registered  with  return  receipt  requested,   postage  prepaid,  and
          addressed as follows:

                  To Geron at:              Geron Corporation
                                            230 Constitution Drive
                                            Menlo Park, California  94025
                                            Attention: Chief Financial Officer
                                            Telephone:        (650) 473-7700
                                            Facsimile:        (650) 473-7750

                  With a copy to:           Geron Corporation
                                            230 Constitution Drive
                                            Menlo Park, California  94025
                                            Attention: Senior Director, Legal
                                            Telephone:        (650) 473-7775
                                            Facsimile:        (650) 566-7181

                  To Lonza at:              Lonza Walkersville, Inc.
                                            8830 Biggs Ford Road
                                            Walkersville, Maryland 21793
                                            Attention:  Tim Harrigan
                                            Telephone:        (301) 898-7025
                                            Facsimile:        (301) 845-6099

                                       10
<PAGE>

                  With a copy to:           Lonza America Inc.
                                            25 Commerce Drive
                                            Allendale, New Jersey 07401
                                            Attention: Assistant General Counsel
                                            Telephone:        (201) 316-9422
                                            Facsimile:        (201) 378-5630

     10.  BINDING EFFECT.  This Agreement shall be binding upon the heirs, legal
          representatives and successors of Geron and of Lonza.

     11.  GOVERNING  LAW. This  Agreement  shall be governed by and construed in
          accordance  with the laws of the  State of  Delaware,  without  giving
          effect to its conflicts of laws provisions.

     12.  INVALID PROVISIONS.  In the event that any provision of this Agreement
          is found to be invalid or otherwise  unenforceable by a court or other
          tribunal   of   competent    jurisdiction,    such    invalidity    or
          unenforceability  shall  not  be  construed  as  rendering  any  other
          provision  contained  herein  invalid or  unenforceable,  and all such
          other  provisions  shall be given  full  force and  effect to the same
          extent as though  the  invalid  and  unenforceable  provision  was not
          contained herein.

     13.  COUNTERPARTS.  This  Agreement  may  be  executed  in  any  number  of
          identical counterparts, each of which shall be deemed an original, but
          all of which together shall constitute one and the same instrument.

     14.  AMENDMENTS.  This  Agreement or any  provision  hereof may be changed,
          waived,  or  terminated  only by a statement in writing  signed by the
          party against whom such change,  waiver or termination is sought to be
          enforced.

     15.  FUTURE COOPERATION.  Each of the parties hereto agrees to cooperate at
          all times from and after the date  hereof  with  respect to all of the
          matters  described  herein,  and to execute such further  assignments,
          releases, assumptions,  amendments of the Agreement, notifications and
          other  documents  as may be  reasonably  requested  for the purpose of
          giving effect to, or evidencing or giving notice of, the  transactions
          contemplated by this Agreement.

     16.  ENTIRE AGREEMENT. This Agreement, and the MSA, and Project Order No. 1
          thereto as amended,  constitute  the entire  agreement  of the parties
          pertaining to the Shares and  supersede all prior and  contemporaneous
          agreements,  representations,  and  understandings of the parties with
          respect thereto.

                      REST OF PAGE INTENTIONALLY LEFT BLANK

                                       11

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the Effective Date.

                                     Geron Corporation

                                      /s/ David L. Greenwood
                                     -------------------------------------------
                                     By:      David L. Greenwood
                                     Title:   Executive Vice President and Chief
                                              Financial Officer

                                     LonzaWalkersville, Inc.

                                      /s/ Shawn P. Cavanagh
                                     -------------------------------------------
                                     By:      Shawn P. Cavanagh
                                     Title:   President

                                     LonzaWalkersville, Inc.

                                     /s/ Vinny DiVito
                                     -------------------------------------------
                                     By:      Vinny DiVito
                                     Title:   Chief Financial Officer

                                       12EXHIBIT 4.3

                         COMMON STOCK PURCHASE AGREEMENT

         THIS COMMON STOCK PURCHASE AGREEMENT ("Agreement") is made and  entered
into as of  November  26, 2007 (the  "Effective  Date"),  by and  between  GERON
CORPORATION,  a Delaware  corporation  having its principal place of business at
230 Constitution  Drive,  Menlo Park,  California 94025 ("Geron"),  and Girindus
America Inc., a Delaware  corporation  having its principal place of business at
8560 Reading Road, Cincinnati, Ohio, 45215 ("Manufacturer").

     A.   Geron  and  Manufacturer  are  the  parties  to  that  certain  Master
          Manufacturing   Agreement   dated  as  of   February   27,  2007  (the
          "Manufacturing  Agreement"),  and  related  Project  Orders  ("Project
          Order") under which Geron has agreed to purchase certain products from
          Manufacturer  and  Manufacturer  has agreed to supply such products to
          Geron on the terms set forth therein.

     B.   Pursuant to the  Manufacturing  Agreement,  Geron may pay the purchase
          price of  products  under any  Project  Order by delivery of shares of
          Geron's Common Stock (the "Shares").

THE PARTIES AGREE AS FOLLOWS:

   1. ISSUANCE OF SHARES; ADJUSTMENTS.

     1.1  As  payment  of  the  Second   Installment   under  the  Manufacturing
          Agreement,  Geron  will issue and  deliver  certificates  for  116,099
          Shares.  Upon  issuance  and  delivery of the  certificate(s)  for the
          Shares,  all Shares shall be duly  authorized  and validly  issued and
          represent fully paid shares of Geron's Common Stock.

   2. CLOSING; DELIVERY.

     2.1  The consummation of the transaction  contemplated by this Agreement (a
          "Closing")  shall be held at such time and place as is mutually agreed
          upon  between  the  parties,   but  in  any  event  Geron  shall  make
          commercially  reasonable  efforts to  accomplish  the Closing no later
          than three (3)  business  days after the  Effective  Date  hereof (the
          "Closing Date").  At the Closing,  Geron shall deliver to Manufacturer
          one or more certificates  representing all of the Shares, which Shares
          shall be issued in the name of  Manufacturer  or its  designee  and in
          such denominations as Manufacturer shall specify.

     2.2  Geron's  obligations  to issue and  deliver  the stock  certificate(s)
          representing  the  Shares  to  Manufacturer  at the  Closing  shall be
          subject to the following conditions, which may be waived by Geron:

        2.2.1  the covenants and obligations  that  Manufacturer is required to
               perform or to comply with pursuant to this Agreement, at or prior
               to the Closing,  must have been duly  performed and complied with
               in all material respects; and

        2.2.2  the  representations  and warranties made by Manufacturer herein
               shall be true and  correct  in all  material  respects  as of the
               Closing Date.

     2.3  Manufacturer's   obligation   to   accept   delivery   of  the   stock
          certificate(s) representing the Shares at the Closing shall be subject
          to the following conditions, any one or more of which may be waived by
          Manufacturer:

        2.3.1  the covenants and obligations  that Geron is required to perform
               or to comply with pursuant to this Agreement,  at or prior to the
               Closing,  must have been duly  performed and complied with in all
               material respects;

                                       1
<PAGE>

        2.3.2  Geron   shall   have   available   under  its   Certificate   of
               Incorporation  sufficient  authorized  shares of Common  Stock to
               issue the Shares to Manufacturer; and

        2.3.3  the representations and warranties made by Geron herein shall be
               true and correct in all material respects as of the closing date;

   3. RESTRICTIONS ON RESALE OF SHARES.

     3.1  Legends. Manufacturer understands and acknowledges that the Shares are
          not registered under the Securities Act of 1933 (the "Act"),  and that
          under the Act and other  applicable laws  Manufacturer may be required
          to hold such  Shares  for an  indefinite  period of time.  Each  stock
          certificate representing Shares shall bear the following legends:

          "THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER  THE
          SECURITIES  ACT OF 1933, AS AMENDED (THE "ACT").  ANY TRANSFER OF SUCH
          SECURITIES SHALL BE INVALID UNLESS A REGISTRATION  STATEMENT UNDER THE
          ACT IS IN EFFECT AS TO SUCH  TRANSFER  OR, IN THE  OPINION  OF COUNSEL
          REASONABLY  ACCEPTABLE TO GERON,  SUCH REGISTRATION IS UNNECESSARY FOR
          SUCH  TRANSFER  TO COMPLY  WITH THE ACT.  THE  SECURITIES  REPRESENTED
          HEREBY ARE SUBJECT TO THE TERMS OF THE COMMON STOCK PURCHASE AGREEMENT
          BY AND BETWEEN  MANUFACTURER AND GERON, DATED AS OF NOVEMBER 26, 2007.
          A COPY OF THE AGREEMENT CAN BE OBTAINED FROM THE SECRETARY OF GERON."

     3.2  Limits on Sales. Manufacturer agrees that if it decides to resell some
          or all of the  Shares,  it  will  do so  only  through  orderly  sales
          executed  through a reputable  brokerage  house, and in an appropriate
          manner based upon whether the shares are  registered or  unregistered,
          i.e.,  on the  Nasdaq  National  Market  or in a Rule 144A or Rule 144
          compliant  transaction.  Manufacturer  further agrees that it will not
          itself  engage in short  selling with  respect to the Stock.  Provided
          that the  brokerage  house meets the  requirements  set forth  herein,
          nothing shall limit Manufacturer's right to select the brokerage house
          of its choice.

     3.3  Removal of Legends.  Any legend  endorsed on a certificate  evidencing
          the Shares  shall be  removed,  and Geron  shall  issue a  certificate
          without such legend to the Manufacturer, if such Shares are being sold
          pursuant  to an  effective  registration  statement  under  the Act or
          pursuant to Rule 144  promulgated  thereunder,  and the  purchaser  of
          registered   Shares  may   immediately   resell  such  Shares  without
          restriction; provided, however, that in the case of a sale pursuant to
          Rule 144, such holder of Shares shall provide such  information  as is
          reasonably  requested  by Geron to ensure that such Shares may be sold
          in reliance on Rule 144.

   4. REGISTRATION RIGHTS

                                       2

<PAGE>

     4.1  Geron agrees to make commercially  reasonable efforts to file with the
          Securities and Exchange Commission (the "Commission"), within five (5)
          business days after the Closing Date, a registration  statement  under
          the  Act  (the  "Registration  Statement"),   on  Form  S-3  or  other
          appropriate form, so as to permit a  non-underwritten  public offering
          and resale of the  Shares  under the Act by  Manufacturer.  Geron will
          exercise  reasonable  efforts  to cause  the form of the  Registration
          Statement to satisfy all  applicable  requirements  of the Act and the
          regulations of the Commission  thereunder.  Geron agrees to diligently
          pursue making the Registration Statement effective.  Geron will notify
          Manufacturer of the effectiveness of the Registration Statement within
          one (1) business day of receiving notice from the Commission.

     4.2  Geron will maintain the Registration  Statement and any post-effective
          amendment  thereto filed under this Section 4 effective  under the Act
          until the earliest of (i) the date that none of the Shares  covered by
          such Registration Statement are issued and outstanding,  (ii) the date
          that all of the Shares have been sold  pursuant  to such  Registration
          Statement,  (iii) the date Manufacturer receives an opinion of counsel
          from  Geron,   which  counsel   shall  be  reasonably   acceptable  to
          Manufacturer, that the Shares may be sold under the provisions of Rule
          144, (iv) the date that all Shares have been otherwise  transferred to
          persons who may trade such shares without  restriction  under the Act,
          and  Geron  has  delivered  a new  certificate  or other  evidence  of
          ownership for such securities not bearing a restrictive legend, or (v)
          the date all Shares may be sold at any time,  without volume or manner
          of sale limitations  pursuant to Rule 144(k) or any similar  provision
          then in effect under the Act in the opinion of counsel to Geron, which
          counsel shall be reasonably acceptable to Manufacturer.

     4.3  Geron, at its expense,  shall furnish to Manufacturer  with respect to
          the Shares registered under the Registration Statement such reasonable
          number of  copies  of the  Registration  Statement,  prospectuses  and
          preliminary  prospectuses in conformity  with the  requirements of the
          Act and such other documents as Manufacturer  may reasonably  request,
          in order to facilitate the public sale or other  disposition of all or
          any of  the  Shares  by  Manufacturer,  provided,  however,  that  the
          obligation of Geron to deliver copies of  prospectuses  or preliminary
          prospectuses to Manufacturer  shall be subject to the receipt by Geron
          of reasonable  assurances from  Manufacturer  that  Manufacturer  will
          comply  with the  applicable  provisions  of the Act and of such other
          securities or blue sky laws as may be  applicable  in connection  with
          any use of such prospectuses or preliminary prospectuses.

     4.4  All fees,  disbursements and out-of-pocket expenses and costs incurred
          by  Geron  in  connection  with  the  preparation  and  filing  of the
          Registration  Statement  under  Section  4.1  and  in  complying  with
          applicable   securities   and  Blue  Sky  laws   (including,   without
          limitation,  all  attorneys'  fees of Geron)  shall be borne by Geron.
          Manufacturer   shall   bear  the  cost  of  fees   and   expenses   of
          Manufacturer's counsel.

     4.5  Geron will advise Manufacturer  promptly after it shall receive notice
          or  obtain  knowledge  of  the  issuance  of  any  stop  order  by the
          Commission   delaying  or   suspending   the   effectiveness   of  the
          Registration Statement or of the initiation of any proceeding for that
          purpose,  and Geron will use its  commercially  reasonable  efforts to
          prevent the issuance of any stop order or to obtain its  withdrawal at
          the earliest possible moment if such stop order should be issued.

     4.6  With a view to making  available to Manufacturer  the benefits of Rule
          144 (or its  successor  rule) and any other rule or  regulation of the
          Commission that may at the time permit Manufacturer to sell the Shares
          to the public without registration, Geron covenants and agrees to: (i)
          make  and keep  public  information  available,  as  those  terms  are
          understood  and  defined in Rule 144,  until the  earliest of (A) such
          date as all of the Shares may be resold pursuant to Rule 144(k) or any
          other  rule of  similar  effect or (B) such date as all of the  Shares
          shall have been resold;  and (ii) file with the Commission in a timely
          manner all reports and other documents required of Geron under the Act
          and under the Securities Exchange Act of 1934 (the "Exchange Act"), as
          amended.

                                       3
<PAGE>

     4.7  Manufacturer  will  cooperate with Geron in all respects in connection
          with  this  Agreement,  including  timely  supplying  all  information
          reasonably  requested by Geron (which  shall  include all  information
          regarding  Manufacturer  and  proposed  manner  of sale of the  Shares
          required to be disclosed in any Registration  Statement) and executing
          and returning all documents  reasonably  requested in connection  with
          the  registration  and  sale  of the  Shares  and  entering  into  and
          performing their obligations under any underwriting  agreement, if the
          offering is an  underwritten  offering,  in usual and customary  form,
          with the managing  underwriter or  underwriters  of such  underwritten
          offering.  Nothing in this Agreement  shall obligate  Manufacturer  to
          consent to be named as an underwriter in any Registration Statement.

     4.8  Geron  shall  prepare  and  file  with  the SEC  such  amendments  and
          supplements  to the  Registration  Statement  as may be  necessary  to
          comply with the provisions of the Act with respect to the  disposition
          of  all  Shares  covered  by  the  Registration  Statement;  provided,
          however,  that promptly after filing a  registration  statement or any
          amendments or  supplements  thereto,  or comparable  statements  under
          securities  or blue sky laws of any  jurisdiction,  Geron will furnish
          one (1) copy to counsel designated by Manufacturer.

          Geron shall  promptly  notify  Manufacturer,  at  any  time  when  the
          prospectus included in or relating to  the     Registration  Statement
          (the  "Prospectus") is      required to be delivered under the Act, of
          the  happening  of any event as      a result of which the  Prospectus
          contains an untrue   statement of a    material fact or omits any fact
          necessary  to  make       the  statements  therein,  in  light  of the
          circumstances    under  which they were made, not  misleading;  and,
          thereafter, Geron      will as promptly as possible prepare (and, when
          completed, give      notice to Manufacturer) a supplement or amendment
          to such    Prospectus  so  that,  as  thereafter     delivered  to the
          purchasers of such Shares pursuant to      the Registration Statement,
          such  Prospectus  will  not  contain  an     untrue  statement    of a
          material  fact or omit to state  any     fact  necessary  to make  the
          statements  therein,     in light of the  circumstances  under   which
          they  were  made,  not   misleading;   provided  that       upon  such
          notification   by  Geron   of  the   foregoing     and     instructing
          Manufacturer to cease to offer and sell    Shares,   Manufacturer will
          its best efforts to promptly suspend its      offer and sale of Shares
          until  Geron   has  notified  Manufacturer  that it has     prepared a
          supplement or amendment to such  Prospectus    and delivered    copies
          of such supplement or amendment to Manufacturer.

   5.    INDEMNIFICATION.

                                       4
<PAGE>

     5.1  Geron agrees to indemnify  and hold  harmless  Manufacturer  (and each
          person,  if any,  who  controls  Manufacturer  within  the  meaning of
          Section 15 of the Act, and each officer and director of  Manufacturer)
          against any and all losses, claims, damages or liabilities (or actions
          or  proceedings  in respect  thereof),  joint or several,  directly or
          indirectly  based upon or arising out of (i) any untrue  statement  or
          alleged  untrue  statement  of  any  material  fact  contained  in the
          Registration Statement,  any preliminary prospectus,  final prospectus
          or summary prospectus contained therein or used in connection with the
          offering of the Shares,  or any  amendment or supplement  thereto,  or
          (ii)  any  omission  or  alleged  omission  to state a  material  fact
          required  to be stated  therein or  necessary  to make the  statements
          therein not misleading; and Geron will reimburse each such indemnified
          party for any legal or any other expenses  reasonably incurred by them
          in connection with investigating, preparing, pursuing or defending any
          such loss,  claim,  damage,  liability,  action or proceeding,  except
          insofar as any such loss, claim, damage, liability, action, proceeding
          or expense (A) arises out of or is based upon an untrue  statement  or
          alleged untrue  statement or omission or alleged  omission made in the
          Registration  Statement,   any  such  preliminary  prospectus,   final
          prospectus,  summary  prospectus,  amendment or supplement in reliance
          upon and in conformity with written information  furnished to Geron by
          Manufacturer or such other person expressly for use in the preparation
          thereof,  (B) the failure of Manufacturer to comply with its covenants
          and  agreements  contained  in Sections 7.1 or 7.5.2 hereof or (C) any
          misstatement  or omission in any  prospectus  that is corrected in any
          subsequent  prospectus that was delivered to Manufacturer prior to the
          pertinent sale or sales by  Manufacturer.  Such indemnity shall remain
          in full force and effect, regardless of any investigation made by such
          indemnified  party and shall  survive  the  transfer  of the Shares by
          Manufacturer.

     5.2  Manufacturer  agrees to indemnify  and hold  harmless  Geron (and each
          person, if any, who controls Geron within the meaning of Section 15 of
          the Act,  each officer of Geron who signs the  Registration  Statement
          and each director of Geron) from and against losses,  claims,  damages
          or liabilities (or actions or proceedings in respect  thereof),  joint
          or several,  directly or indirectly  based upon or arising out of, (i)
          any  failure  of   Manufacturer  to  comply  with  the  covenants  and
          agreements  contained  in  Sections  7.1 and 7.5.2  hereof or (ii) any
          untrue  statement of a material  fact  contained  in the  Registration
          Statement or any omission of a material  fact required to be stated in
          the  Registration   Statement  or  necessary  in  order  to  make  the
          statements in the Registration Statement not misleading if such untrue
          statement or omission was made in reliance upon and in conformity with
          written information furnished to Geron by or on behalf of Manufacturer
          specifically  for use in  preparation of the  Registration  Statement;
          provided,  however,  that Manufacturer shall not be liable in any such
          case for (A) any untrue  statement  or  omission  in the  Registration
          Statement,  prospectus,  or other such  document  which  statement  is
          corrected  by  Manufacturer  and  delivered to Geron prior to the sale
          from which such loss occurred, (B) any untrue statement or omission in
          any prospectus  which is corrected by  Manufacturer  in any subsequent
          prospectus, or supplement or amendment thereto, and delivered to Geron
          prior to the sale or sales from which a loss or  liability  arose,  or
          (C) any  failure  by Geron to  fulfill  any of its  obligations  under
          Section 5.1 hereof.

                                       5
<PAGE>

     5.3  Promptly  after  receipt  by any  indemnified  person of a notice of a
          claim or the beginning of any action in respect of which  indemnity is
          to be sought against an  indemnifying  person pursuant to this Section
          5, such  indemnified  person shall notify the  indemnifying  person in
          writing of such claim or of the  commencement of such action,  but the
          omission to so notify the indemnifying  party will not relieve it from
          any liability  which it may have to any  indemnified  party under this
          Section 5 (except  to the extent  that such  omission  materially  and
          adversely  affects  the  indemnifying  party's  ability to defend such
          action) or from any  liability  otherwise  than under this  Section 5.
          Subject to the provisions  hereinafter stated, in case any such action
          shall be  brought  against an  indemnified  person,  the  indemnifying
          person shall be entitled to  participate  therein,  and, to the extent
          that it shall elect by written  notice  delivered  to the  indemnified
          party  promptly  after  receiving  the  aforesaid   notice  from  such
          indemnified  party,  shall be entitled to assume the defense  thereof,
          with counsel reasonably satisfactory to such indemnified person. After
          notice from the indemnifying  person to such indemnified person of its
          election to assume the defense thereof, such indemnifying person shall
          not be  liable  to  such  indemnified  person  for any  legal  expense
          subsequently  incurred by such  indemnified  person in connection with
          the defense thereof, provided,  however, that if there exists or shall
          exist a conflict of  interest  that would make  inappropriate,  in the
          reasonable opinion of counsel to the indemnified  person, for the same
          counsel to represent both the indemnified person and such indemnifying
          person or any affiliate or associate  thereof,  the indemnified person
          shall be  entitled  to retain its own  counsel at the  expense of such
          indemnifying person;  provided,  however,  that no indemnifying person
          shall  be  responsible  for the  fees and  expenses  of more  than one
          separate  counsel  (together with  appropriate  local counsel) for all
          indemnified  parties.  In no event  shall any  indemnifying  person be
          liable in  respect to any  amounts  paid in  settlement  of any action
          unless the  indemnifying  person shall have approved the terms of such
          settlement.  No indemnifying  person shall,  without the prior written
          consent  of the  indemnified  person,  effect  any  settlement  of any
          pending or threatened  proceeding in respect of which any  indemnified
          person is or could  have been a party and  indemnification  could have
          been  sought  hereunder  by  such  indemnified  person,   unless  such
          settlement  includes  an  unconditional  release  of such  indemnified
          person from all  liability  on claims  that are the subject  matter of
          such proceeding.

     5.3  The provisions of this Section 5 shall survive the termination of this
          Agreement.

    6. REPRESENTATIONS AND COVENANTS OF GERON.

         Geron hereby represents, warrants and covenants to Manufacturer as
follows:

     6.1  Organization, Good Standing and Qualification.  Geron is a corporation
          duly organized,  validly  existing and in good standing under the laws
          of the State of Delaware  and has all  requisite  corporate  power and
          authority to carry on its business as now  conducted  and as presently
          proposed to be conducted. Geron is duly qualified to transact business
          and is in good standing as a foreign  corporation in each jurisdiction
          in which the  failure  to so qualify  would  have a  material  adverse
          effect on its business or properties.

     6.2  Authorization.  All  corporate  action  on  the  part  of  Geron,  its
          officers,  directors and stockholders necessary for the authorization,
          execution  and  delivery of this  Agreement,  the  performance  of all
          obligations  of Geron  hereunder and the  authorization,  issuance and
          delivery  of the Shares  has been taken or will be taken  prior to the
          Closing,  and  this  Agreement,  when  executed  and  delivered,  will
          constitute  the  valid  and  legally  binding  obligations  of  Geron,
          enforceable  against  Geron in  accordance  with its terms,  except as
          limited  by   applicable   bankruptcy,   insolvency,   reorganization,
          moratorium,   fraudulent   conveyance   and  other   laws  of  general
          application affecting  enforcement of creditors' rights generally,  as
          limited by laws relating to the availability of specific  performance,
          injunctive relief or other equitable remedies.

     6.3  Valid  Issuance of Common  Stock.  The Shares,  when issued,  sold and
          delivered in  accordance  with the terms hereof for the  consideration
          expressed  herein,  will be duly and  validly  authorized  and issued,
          fully paid and  nonassessable  and free of  restrictions  on  transfer
          other  than   restrictions   on  transfer  under  this  Agreement  and
          applicable state and federal securities laws.

                                       6
<PAGE>

     6.4  Legal Proceedings and Orders. There is no action, suit,  proceeding or
          investigation  pending or threatened  against Geron that questions the
          validity  of this  Agreement  or the right of Geron to enter into this
          Agreement or to consummate the transactions  contemplated  hereby, nor
          is Geron aware of any basis for any of the forgoing.  Geron is neither
          a  party  to  nor  subject  to the  provisions  of  any  order,  writ,
          injunction,  judgment or decree of any court or  government  agency or
          instrumentality  that would  affect the ability of Geron to enter into
          this Agreement or to consummate the transactions contemplated hereby.

   7. REPRESENTATIONS AND ACKNOWLEDGMENTS OF MANUFACTURER.

   Manufacturer hereby represents, warrants, acknowledges and agrees that:

     7.1  Investment.  Manufacturer  is acquiring the Shares for  Manufacturer's
          own  account,  and not directly or  indirectly  for the account of any
          other person.  Manufacturer is acquiring the Shares for investment and
          not  with  a  view  to  distribution  or  resale  thereof,  except  in
          compliance  with  the Act  and any  applicable  state  law  regulating
          securities.

     7.2  Access  to  Information.  Manufacturer  has  consulted  with  its  own
          attorney, accountant, or investment advisor as Manufacturer has deemed
          advisable  with  respect  to the  investment  and has  determined  its
          suitability for Manufacturer.  Manufacturer has had the opportunity to
          ask questions of, and to receive answers from,  appropriate  executive
          officers  of Geron  with  respect to the terms and  conditions  of the
          transactions  contemplated  hereby and with  respect to the  business,
          affairs,  financial  condition  and  results of  operations  of Geron.
          Manufacturer has had access to such financial and other information as
          is  necessary  in  order  for  Manufacturer  to make a fully  informed
          decision as to investment  in Geron,  and has had the  opportunity  to
          obtain  any  additional  information  necessary  to verify any of such
          information  to  which  Manufacturer  has  had  access.   Manufacturer
          acknowledges  that neither Geron nor any of its  officers,  directors,
          employees,   agents,   representatives,   or  advisors  has  made  any
          representation  or warranty  other than those  specifically  expressed
          herein.

     7.3  Business and Financial Expertise.  Manufacturer further represents and
          warrants  that it has such  business or  financial  expertise as to be
          able to evaluate its investment in Geron and purchase of the Shares.

     7.4  Speculative Investment.  Manufacturer acknowledges that the investment
          in Geron represented by the Shares is highly speculative in nature and
          is subject to a high  degree of risk of loss in whole or in part;  the
          amount of such investment is within  Manufacturer's risk capital means
          and is not so great in  relation  to  Manufacturer's  total  financial
          resources  as  would  jeopardize  the  personal   financial  needs  of
          Manufacturer  in the event  such  investment  were lost in whole or in
          part.

     7.5  Unregistered Securities. Manufacturer acknowledges that:

        7.5.1  Manufacturer  must bear the economic risk of  investment  for an
               indefinite  period  of time  because  the  Shares  have  not been
               registered  under the Act and  therefore  cannot  and will not be
               sold unless they are subsequently  registered under the Act or an
               exemption from such registration is available.  Geron has made no
               agreements,  covenants or undertakings whatsoever to register any
               of the  Shares  under the Act,  except as  provided  in Section 4
               above. Geron has made no representations, warranties or covenants
               whatsoever as to whether any exemption  from the Act,  including,
               without  limitation,  any  exemption for limited sales in routine
               brokers'  transactions  pursuant to Rule 144 under the Act,  will
               become available and any such exemption  pursuant to Rule 144, if
               available  at all,  will not be  available  unless:  (i) a public
               trading  market then exists in Geron's  common stock,  (ii) Geron
               has complied with the  information  requirements of Rule 144, and
               (iii)  all  other  terms  and  conditions  of Rule 144 have  been
               satisfied.

                                       7
<PAGE>

          7.5.2 Transfer  of the Shares  has not been  registered  or  qualified
               under  any  applicable  state  law  regulating   securities  and,
               therefore, the Shares cannot and will not be sold unless they are
               subsequently  registered  or  qualified  under any such act or an
               exemption  therefrom is available.  Geron has made no agreements,
               covenants or  undertakings  whatsoever to register or qualify any
               of the Shares  under any such act except as provided in Section 4
               above. Geron has made no representations, warranties or covenants
               whatsoever  as to whether  any  exemption  from any such act will
               become available.

          7.5.3 Manufacturer   hereby   certifies  that  it  is  an  "Accredited
               Investor" as that term is defined in Rule 501 under the Act.

     8.   TAX ADVICE. Manufacturer acknowledges that Manufacturer has not relied
          and will not rely upon Geron or Geron's  counsel  with  respect to any
          tax consequences related to the ownership, purchase, or disposition of
          the Shares.  Manufacturer  assumes  full  responsibility  for all such
          consequences and for the preparation and filing of all tax returns and
          elections which may or must be filed in connection with the Shares.

     9.   NOTICES.  Any  notice,  demand  or  other  communication  required  or
          permitted  hereunder  shall be in writing  and shall be deemed to have
          been duly given on the date of delivery if delivered  personally or by
          facsimile,  or one day, not including Saturdays,  Sundays, or national
          holidays,  after  sending  if  sent  by  national  overnight  delivery
          service, or five days, not including  Saturdays,  Sundays, or national
          holidays,  after  mailing if mailed by first class United States mail,
          certified  or  registered  with  return  receipt  requested,   postage
          prepaid, and addressed as follows:

                  To Geron at:                Geron Corporation
                                              230 Constitution Drive
                                              Menlo Park, California  94025
                                              Attention: General Counsel
                                              Telephone:        (650) 473-7700
                                              Facsimile:        (650) 473-7750

                  To Manufacturer at:         Girindus America Inc.
                                              8560 Reading Rd
                                              Cincinnati , Ohio, 45215
                                              Attention: President
                                              Telephone:        (513) 679 - 3000
                                              Facsimile:        (513) 679 - 3053

     10.  BINDING EFFECT.  This Agreement shall be binding upon the heirs, legal
          representatives and successors of Geron and of Manufacturer; provided,
          however,  that  Manufacturer  may not assign any rights or obligations
          under this  Agreement  except to an entity  controlling,  under common
          control with or controlled by  Manufacturer.  Geron may not assign any
          of its rights or obligations under this Agreement.

     11.  GOVERNING  LAW. This  Agreement  shall be governed by and construed in
          accordance with the laws of the State of Delaware.

     12.  INVALID PROVISIONS.  In the event that any provision of this Agreement
          is found to be invalid or otherwise  unenforceable by a court or other
          tribunal   of   competent    jurisdiction,    such    invalidity    or
          unenforceability  shall  not  be  construed  as  rendering  any  other
          provision  contained  herein  invalid or  unenforceable,  and all such
          other  provisions  shall be given  full  force and  effect to the same
          extent as though  the  invalid  and  unenforceable  provision  was not
          contained herein.

     13.  COUNTERPARTS.  This  Agreement  may  be  executed  in  any  number  of
          identical counterparts, each of which shall be deemed an original, but
          all of which together shall constitute one and the same instrument.

     14.  AMENDMENTS.  This  Agreement or any  provision  hereof may be changed,
          waived,  or  terminated  only by a statement in writing  signed by the
          party against whom such change,  waiver or termination is sought to be
          enforced.

                                       8
<PAGE>

     15.  FUTURE COOPERATION.  Each of the parties hereto agrees to cooperate at
          all times from and after the date  hereof  with  respect to all of the
          matters  described  herein,  and to execute such further  assignments,
          releases, assumptions,  amendments of the Agreement, notifications and
          other  documents  as may be  reasonably  requested  for the purpose of
          giving effect to, or evidencing or giving notice of, the  transactions
          contemplated by this Agreement.

     16.  ENTIRE AGREEMENT.  This Agreement and the Supply Agreement,  including
          all Project Orders  thereto,  constitute  the entire  agreement of the
          parties   pertaining  to  the  Shares  and  supersede  all  prior  and
          contemporaneous agreements, representations, and understandings of the
          parties with respect thereto.

                   REMAINDER OF PAGE INTENTIONALLY LEFT BLANK

                                       9
<PAGE>

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

                                     Geron Corporation

                                       /s/ David L. Greenwood
                                     -------------------------------------
                                     By:      David L. Greenwood
                                     Title:   Executive Vice President and Chief
                                              Financial Officer

                                     Girindus America Inc.

                                       /s/ Greg McParland
                                     -------------------------------------
                                     By:      Greg McParland
                                     Title:   CEO

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