Document:

EXHIBIT 4.1

                         COMMON STOCK PURCHASE AGREEMENT

     THIS COMMON STOCK PURCHASE AGREEMENT ("Agreement") is made and entered into
as  of  November  22,  2006  (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  MPI
Research, Inc., a Michigan corporation having its principal place of business at
54943 North Main Street, Mattawan, MI 49071 ("MPI").

     A.   Geron and MPI are the parties to that certain Master  Agreement  dated
          as of December 12, 2003 (the "Master Agreement"), and related Services
          ServicesAgreements  ("Services  Agreement")  under which Geron and MPI
          have agreed that MPI will perform certain  services on behalf of Geron
          on the terms set forth therein.

     B.   Pursuant to Amendment No. 2 to the Agreement,  dated November 22, 2006
          ("Amendment  No. 2"),  Geron may pay for the price of such services 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 price  specified in Amendment No. 2, Geron will
               issue and deliver  certificates for 114,155 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 five (5) business days after the Effective Date hereof (the
               "Closing Date").  At the Closing,  Geron shall deliver to MPI one
               or more certificates representing all of the Shares, which Shares
               shall be  issued in the name of MPI or its  designee  and in such
               denominations as MPI shall specify.

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

               2.2.1 the  covenants  and  obligations  that MPI 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 MPI herein shall
                     be true and  correct  in all  material  respects  as of the
                     Closing Date.

          2.3  MPI'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
               MPI:

               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;

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

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

   3.     RESTRICTIONS ON RESALE OF SHARES.

          3.1  Legends. MPI 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 MPI 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,  DATED AS OF [X]. A COPY
               OF THE AGREEMENT CAN BE OBTAINED FROM THE SECRETARY OF GERON."

          3.2  Limits on Sales.  MPI agrees that if it decides to resell some or
               all of the  Shares,  it  will do so only  through  orderly  sales
               executed   through  a  top-tier   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 compliant  transaction.  MPI further agrees that it will not
               engage in short selling with respect to the Stock.

   4.     REGISTRATION RIGHTS

          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 MPI.
               Geron  agrees  to  diligently   pursue  making  the  Registration
               Statement  effective.  Geron will notify MPI 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
               MPI  receives  an opinion of counsel  from Geron,  which  counsel
               shall be  reasonably  acceptable  to MPI,  that the Shares may be
               sold under the  provisions  of Rule 144 without  limitation as to
               volume,  (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 MPI.

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          4.3  Geron,  at its expense,  shall furnish to MPI 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 MPI may
               reasonably  request,  in order to  facilitate  the public sale or
               other  disposition of all or any of the Shares by MPI,  provided,
               however,  that  the  obligation  of Geron to  deliver  copies  of
               prospectuses or preliminary  prospectuses to MPI shall be subject
               to the receipt by Geron of  reasonable  assurances  from MPI that
               MPI 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.  MPI  shall  bear the cost of fees and  expenses  of MPI's
               counsel.

          4.5  Geron will advise MPI 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 MPI the benefits of Rule 144
               (or its  successor  rule) and any other rule or regulation of the
               Commission  that may at the time permit MPI 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.

          4.7  MPI 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  MPI 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  MPI to consent to be
               named as an underwriter in any Registration Statement.

   5.     INDEMNIFICATION.

          5.1  Geron agrees to indemnify and hold harmless MPI (and each person,
               if any,  who controls MPI within the meaning of Section 15 of the
               Act,  and each  officer and  director of MPI) 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

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               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 MPI or such other person  expressly for use
               in the preparation thereof, (B) the failure of MPI 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
               MPI prior to the pertinent  sale or sales by MPI. 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 MPI.

          5.2  MPI 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 MPI 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 on behalf of MPI  specifically  for use in
               preparation of the  Registration  Statement;  provided,  however,
               that MPI 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 MPI 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  MPI 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.

          5.3  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 define 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

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               the expense of such indemnifying person; provided,  however, that
               no  indemnifying  person  shall be  responsible  for the fees and
               expenses  of  more  than  on  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.

          5.4  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 MPI 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.  All corporate  action on the party 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  valid and legally binding
               obligations  of Geron,  enforceable  against  Geron in accordance
               with their  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.

          6.4  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  this
               transactions contemplated hereby, nor is Geron aware of any basis
               for any of the forgoing.  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 MPI.

          MPI hereby represents, warrants, acknowledges and agrees that:

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          7.1  Investment.  MPI is  acquiring  the Shares for MPI's own account,
               and not  directly  or  indirectly  for the  account  of any other
               person. MPI 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.  MPI has consulted with its own attorney,
               accountant,  or  investment  advisor as MPI has deemed  advisable
               with respect to the investment and has determined its suitability
               for MPI. MPI 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.  MPI has
               had  access  to  such  financial  and  other  information  as  is
               necessary in order for MPI 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 MPI has had access.  MPI  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.  MPI 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.  MPI 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 MPI's risk capital
               means and is not so great in relation  to MPI's  total  financial
               resources as would jeopardize the personal financial needs of MPI
               in the event such investment were lost in whole or in part.

          7.5  Unregistered Securities. MPI acknowledges that:

               7.5.1 MPI  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.

               7.5.2 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.

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

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   8.     TAX ADVICE. MPI acknowledges that MPI 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. MPI
          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: General Counsel
                                       Telephone:        (650) 473-7700
                                       Facsimile:        (650) 473-7750

                  To MPI at:           MPI Research, Inc.
                                       54943 North Main Street
                                       Mattawan, MI 49071
                                       Telephone:  269.668.3336
                                       Facsimile:  269.668.4151

   10.    BINDING EFFECT.  This Agreement shall be binding upon the heirs, legal
          representatives and successors of Geron and of MPI; provided, however,
          that  MPI  may  not  assign  any  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 California.

   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.

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   16.    ENTIRE AGREEMENT.  This Agreement and the Master Agreement,  including
          Amendment  No. 2  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.

          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

                                            MPI Research, Inc.

                                            /s/ Andy P. Dumpis
                                            ------------------------------------
                                            By:     Andress P. Dumpis
                                            Title:  Treasurer, CAO

                                       8Amendment

                                                                Exhibit
    10.1

    AMENDMENT
      TO TERMINATE EMPLOYMENT AGREEMENT

    

    This
AMENDMENT
      TO EMPLOYMENT AGREEMENT (the
“Amendment”), made in the City of Plano and
      the State of Texas,
      dated as of December 1, 2006, between J. C. Penney Corporation, Inc., a Delaware
      corporation (hereinafter called the “Employer”), and Robert B. Cavanaugh
      (hereinafter called the “Employee”).

     

    WHEREAS,
      the Employee and the Employer have previously entered into that certain
      Employment Agreement dated May 1, 2005 (hereinafter called the
“Agreement”); 

     

    WHEREAS,
      the Employee and Employer have mutually agreed to terminate the employment
      agreement;

     

    NOW
      THEREFORE, in consideration of the promises and of the mutual covenants herein
      contained, Employer and Employee herby agree to amend the Agreement pursuant
      to
      Section 10.8 thereof, and they hereby agree as follows:

     

    
      	1.  	
              Termination
                of Agreement. The Employer and Employee mutually agree to terminate
                the Employment Agreement as of the date first written
                above.

            

    

     

    
      	2.  	
              Execution
                of Executive Termination Pay Agreement. The Employee and Employer
                agree that upon their execution of an Executive Termination Pay Agreement
                all provisions of the Agreement that survive termination as provided
                in
                Section 9 of the Agreement are hereby waived and made null and void.
                

            

    

     

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

     

    J.
      C. Penney Corporation, Inc.

    

    

    By: /s/
      Myron E. Ullman 

    Name:
      Myron E. Ullman

    Title:
      Chairman & CEO

    

    Employee

     

    /s/
      Robert B. Cavanaugh

    Robert
      B.
      Cavanaugh

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