EXHIBIT 10.6



                                LICENSE AGREEMENT
                                -----------------


         THIS  Agreement  is  effective  as of this  15th day of June  1994 (the
"Effective Date"),  between ELI LILLY AND COMPANY, an Indiana corporation having
its principal  offices at Lilly Corporate  Center,  Indianapolis,  Indiana 46285
(Lilly)

                                       AND

         JENNER  TECHNOLOGIES,  a California  corporation  having its  principal
offices at 1895 Mountain View Drive, Tiburon, CA 94920 (Jenner).

                                    RECITALS
                                    --------
         1. Jenner  desires to obtain a  co-exclusive  license under Lilly owned
Patent Rights covering genes encoding the human KS1/4 antigen (KSA).

         2. Jenner also desires to obtain a non-exclusive license to Lilly owned
Biological  Materials useful in conducting  research and development of products
based on KSA.

         3. Lilly is willing to grant such a license to Jenner,  under the terms
and conditions set forth below.

         NOW THEREFORE,  in  consideration  of the promises and mutual covenants
contained herein, Lilly and Jenner agree as follows:

                                    Article I
                                   Definitions
                                   -----------
         1.1 General.  When used in this Agreement,  each of the following terms
shall have the meanings set out in this Article I.

         1.2  "Affiliate"  means  any  person  or  entity  which,   directly  or
indirectly,  owns or controls Jenner,  or which is controlled by or under common
control  with  Jenner.  For  purposes  of this  definition  "control"  means the
ownership,  directly  or  indirectly,  of  fifty  percent  (50%)  or more of the
outstanding equity securities of a corporation  entitled to vote in the election
of directors or a fifty percent  (50%) or greater  interest in the net assets or
profits of an entity which is not a corporation.

         1.3      "Biological Material(s)" means [*].

         1.4      "Co-exclusive" means restricted to Jenner and Lilly.

         1.5 "Know-How"  means any information or technical data that relates to
subject matter of the Patent Rights.


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         1.6 "Net  Sales"  means the amount  received  for sales of  Products by
Jenner,  or its licensees or affiliates,  to an unrelated third party,  less all
allowances  for  discounts,  rebates,  credits,  retroactive  price  reductions,
returns,  distribution  expenses or allowances,  and the value  attributable  to
other than normal delivery systems and any tax imposed on the production,  sale,
delivery or use of the Product(s).

         1.7 "Patent  Rights" means the invention  that forms the subject matter
of  U.S.   Patent   Application   Serial  No.  [*],   including  all  divisions,
substitutions,  continuations,  continuations-in-part (CIP) applications thereof
(excluding any new matter in CIP applications  filed after the Effective Date of
this  Agreement),  any and all  U.S.  patents,  reissues,  re-examinations,  and
extensions  issuing  on any of the  preceding,  and any  and  all  corresponding
foreign patent applications and patents of any of the preceding.

         1.8  "Product(s)"  means any formulation or composition that contains a
protein encoded or produced by, or produced using the DNA compounds, vectors, or
methods claimed under the Patent Rights.

         1.9 "Valid  Claim" means a claim of an unexpired  issued  patent within
the  Patent  Rights  which  has not been held  invalid  or  unenforceable  in an
unappealed  or   unappealable   decision   rendered  by  a  court  of  competent
jurisdiction.

                                   Article II
                             Rights and Obligations
                             ----------------------
         2.1 Grant.  Lilly hereby grants to Jenner a worldwide license under the
Patent Rights and  Biological  Materials,  with the right to grant and authorize
sublicenses, to make, have made, use and sell Products.

         2.2  Exclusivity.  Jenner's  license  under  this  Agreement  shall  be
co-exclusive  with Lilly's rights with respect to the Patent  Rights;  provided,
however, Lilly shall not have the right to authorize or grant sublicenses to the
Patent  Rights  while  Jenner  shall  have the  right  to  authorize  and  grant
sublicenses  to any and all rights herein  granted to Jenner.  Jenner's  license
under  this  Agreement  with  respect  to  the  Biological  Materials  shall  be
non-exclusive.

         2.3  Territory.  Jenner's  license  under this  Agreement  shall  apply
world-wide.

         2.4 Transfer of Biological Material and Know-How.  Lilly shall promptly
transfer the  Biological  Materials  specified by Jenner upon  execution of this
Agreement,  or at such later time as may be agreed by the parties.  Lilly shall,
at Jenner's request,  provide Jenner with copies of all patent  applications and
patents  within the Patent  Rights and  information  regarding the status of any
patent application  and/or patent within the Patent Rights.  Except as expressly
provided  above,  Lilly shall have no obligation to provide Jenner any Know-How.
This  Agreement  shall not  obligate  Lilly to  transfer,  provide or supply any
Biological Material or Know-How to any of Jenner's sublicensees or Affiliates.


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         2.5  Jenner's  Diligence.  Jenner  agrees  to use  reasonable  efforts,
consistent  with its prudent  business  judgment,  to develop,  gain  regulatory
approval,  and market at least one Product.  The efforts required in furtherance
of this  Section 2.5 include an  obligation  to use  reasonable  efforts to seek
regulatory  approval from the U.S. FDA to perform  clinical trials with at least
one Product.

                                   Article III
                                    Payments
                                   -----------
         3.1 Royalties.  Jenner agrees to pay Lilly a running  royalty of [*] on
[*] by Jenner,  its sublicensees and Affiliates of Product(s) covered by a Valid
Claim in the country which such Product is made or sold.

         3.2 Royalty Term. Payments due under this Article 3 shall be payable on
a  country-by-  country  basis until the  expiration of the last to expire Valid
Claim covering the Products in such country.

         3.3 One  Royalty.  No more than one royalty  payment  shall be due with
respect  to a sale of a  particular  Product.  No  multiple  royalties  shall be
payable because any Product, or its manufacture,  use or sale is covered by more
than one claim within the Patent Rights.  No royalty shall be payable under this
Article 3 with  respect  to  Products  distributed  for use in  research  and/or
development, in clinical trials or as promotional samples.

         3.4 Sales to Affiliates  and  Sublicenses.  No royalty shall be payable
under  this  Section 3 with  respect  to sales of  Products  among  Jenner,  its
Affiliates  and/or  sublicensees,  unless such parties are the end users of such
Products.  In the event any Product is sold to an Affiliate or  sublicensee  for
re-sale,  the royalties to be paid  hereunder  for such Products  shall be based
upon the Net Sales of such Products to a third party end-user.

         3.5 [*].  In the event that [*] is sold [*] which is not covered by the
[*] from such sales for purposes of  calculating  the amounts due under  Section
3.1 above shall be calculated [*]. In the event that no such [*] are made by [*]
for royalty  determination shall be as reasonably  allocated by [*] between such
[*], based upon their relative importance and proprietary protection.

         3.6 Milestone Payments. Jenner agrees to pay Lilly [*] of the following
events:

             [*]


         3.7  Notice.  Jenner  shall  promptly  notify  Lilly  upon the [*] with
respect  to the  first  Product  and upon  [*] of the  first  Product.  Jenner's
obligation to pay milestone (i) [*] shall arise upon the [*].

         3.8 Credits.  [*] due upon [*] of the first Product shall be creditable
against  royalties  payable to Lilly on Net Sales by Jenner or its Affiliates or
sublicensees pursuant to Section 3.1 herein.


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         3.9 [*] Fee.  Jenner  agrees to pay Lilly [*] of  receipt  by Jenner of
notification by Lilly of the issuance of the [*].

         3.10  Royalty  Payments.   Royalty  payments  shall  be  calculated  as
specified  in Section  3.1 once per  calendar  year and shall be paid within the
yearly quarter following such calculation.

         3.11  Non-Refundable.  All  payments  made  under any  Section  of this
Agreement shall be non-refundable.

                                   Article IV
                Warranties, Product Liability and Indemnification
                -------------------------------------------------

         4.1 Lilly Warranties.  Lilly warrants that (i) it has the right, and is
authorized,  to grant Jenner the rights  specified under Article II, (ii) it has
the right to enter into this Agreement, (iii) it is the sole owner of all right,
title and interest in the Patent Rights;  (iv) it has not previously granted and
during the term of this Agreement will not grant, any right, license or interest
in the Patent  Rights to any third party in conflict with the rights and license
granted to Jenner herein; and (v) there are no actions,  suits,  investigations,
claims or proceedings, pending or threatened, relating to the Patent Rights.

         4.2 Patents. Nothing in this Agreement shall be construed as a warranty
or  representation by Lilly as to the validity or scope of the Patent Rights, or
a warranty or  representation  by Lilly that anything made,  used, or sold under
this Agreement is or will be free from infringement of patents of third parties,
or a warranty or representation  that the Patent Rights or Product are useful or
safe for any purpose.

         4.3 Jenner  Liability.  Jenner  shall be  responsible  (liable) for all
claims,  including the cost of defending against such claims, fines,  penalties,
and product recalls  arising out of the sale or use of any Product  manufactured
by Jenner or its sublicensees and Affiliates. Jenner shall have Lilly designated
as a named insured in all insurance  policies issued to Jenner covering the sale
or use of  Product.  Further,  Jenner  shall  defend,  indemnify  and hold Lilly
harmless against all claims including, but not limited to, product liability and
related expenses for property damage or personal injury,  including death, which
arise out of the  manufacture,  sale or use of Products  manufactured by Jenner,
its sublicensees or Affiliates pursuant to this Agreement, regardless of whether
the claim is based in contract,  strict  liability,  warranty or any other legal
theory.  Jenner's  obligations  under this Section 4.3 shall only apply if Lilly
provides  Jenner  prompt  notice of any claim  subject to this  Section  4.3 and
cooperates  fully with  Jenner,  at Jenner's  request,  in  connection  with the
defense  thereof.  Jenner shall solely control the defense and settlement of any
such claim.

                                    Article V
                         Patent Prosecution and Defense
                         ------------------------------

         5.1 Patents.  Lilly shall diligently  prosecute and maintain all patent
applications  and patents  within the Patent Rights and keep Jenner  informed of
the status of such applications and patents. In


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the event  that Lilly  fails to  diligently  prosecute  or  maintain  any patent
application or patent within the Patent Rights,  or determines  that it will not
prosecute  or  maintain  any such  patent  application  or patent,  Lilly  shall
promptly  notify  Jenner,  and  Jenner  shall have the right to  prosecute  such
applications or maintain such patent(s) at its own expense, using counsel of its
choice;  provided,  however,  any  amounts  expended  by  Jenner  in  connection
therewith shall be fully creditable  against any amounts due Lilly under Article
3 hereunder.

         5.2 Infringement. Lilly shall not be obligated to enforce or defend any
patent  within the Patent  Rights  unless  specifically  requested in writing by
Jenner,  however,  Lilly shall promptly  notify Jenner of any legal actions that
could  compromise the validity or  enforceability  of any patent with the Patent
Rights. The parties hereto shall give the other prompt notice of any incident of
infringement  of  Patent  Rights  coming to its  attention.  The  parties  shall
thereupon  confer  together  as to what steps are to be taken to stop or prevent
such  infringement.  If  Lilly  commences  such  proceedings,   Lilly  shall  be
responsible  for any legal  costs  incurred  and will be  entitled to retain any
amounts  recovered.  In the event Lilly fails to commence  proceedings  to cease
such  infringement or defend any declaratory  judgment action filed with respect
to the Patent Rights within ninety (90) days of receiving notice thereof, Jenner
shall  be  entitled  to do so in its own  name in which  event  Jenner  shall be
responsible for all legal costs  incurred;  provided,  however,  Jenner shall be
entitled  to offset  any  costs and  expenses  (including  professionals'  fees)
incurred  by it in  connection  with any such suit  against any amounts it would
otherwise  owe to Lilly up to a maximum of fifty  percent (50%) of such amounts.
Lilly  shall  cooperate  fully  with  Jenner in  connection  with any such legal
action,   at  Jenner's   request  and   expense,   including  by  joining  as  a
party-plaintiff.  Any judgment, damages, settlement, or award which results from
any  such  action  shall be used  first to  reimburse  Jenner  for its  expenses
incurred  in  connection  with the  action and then to  reimburse  Lilly for any
royalty  offsets  taken by  Jenner.  Jenner  shall  have the right to retain any
remainder.

         5.3  Interferences;  Oppositions.  In the event  that the Lilly  Patent
Rights become involved in any interference or opposition proceeding, the parties
shall give each other prompt notice thereof and thereupon  confer together as to
what steps are to be taken to pursue or defend  against such  proceeding.  Lilly
shall have the first right to participate in such  proceedings,  at its expense.
Should Lilly elect not to  participate  in such  proceedings  within ninety (90)
days of  receiving  notice  thereof it shall  inform  Jenner and Jenner shall be
entitled to pursue or defend  against such  proceeding  in its own name in which
event  Jenner  shall be  responsible  for all legal  costs  incurred;  provided,
however,  Jenner shall be entitled to offset any costs and  expenses  (including
professionals'  fees)  incurred  by it in  connection  with any such  proceeding
against  any  amounts it would  otherwise  owe to Lilly up to a maximum of fifty
percent  (50%) of such  amounts.  Lilly  shall  cooperate  fully with  Jenner in
connection with any such proceeding, at Jenner's request and expense.

         5.4 [*].  In the event that [*]  enters  into a [*] to [*] made by such
[*] may [*] made in  accordance  with such [*] against the [*] owed [*] pursuant
to Section [*] herein, [*].


                                       -5-






                                   Article VI
                              Term and Termination
                              --------------------

         6.1  Term.  This  Agreement  shall be  effective  as of the date  first
written above,  and unless earlier  terminated  pursuant to this Article 5 shall
continue in full force until the latest  expiry of any patent  within the Patent
Rights.

         6.2 Termination  for Breach.  Either party may terminate this Agreement
on sixty  (60) days  written  notice to the other if the other is in  default or
breach of any material provision, provided, however, that if the party receiving
such notice cures or diligently  commences to cure the breach or default  within
such sixty (60) day  period,  this  Agreement  shall  continue in full force and
effect.  Failure to terminate this Agreement for any default or breach shall not
constitute  a waiver  by the  aggrieved  party of its  right  to  terminate  the
Agreement for any other default or breach.

         6.3  Permissive  Termination.  Jenner shall have the right to terminate
this  Agreement  with respect to any country and/or any Patent Right with thirty
(30) days written notice to Lilly.

         6.4 Surviving  Rights.  Termination of this Agreement shall not deprive
Lilly  of  its  right  to  collect  payments  due  or  interest  owed  prior  to
termination.  Articles 7 and 8 shall survive  expiration or  termination of this
Agreement for any reason.


                                   Article VII
                                 Confidentiality
                                 ---------------

         7.1  Confidential  Information.  Each party shall treat as confidential
all information received from the other which is marked  "CONFIDENTIAL" and each
shall  exercise  reasonable  care to maintain  the  confidentiality  of all such
information,  and  shall  employ it solely to  accomplish  the  purpose  of this
Agreement.

         The  obligations  of  confidentiality  and non-use  imposed  under this
Agreement shall not extend to any information that:

                  (a)      was known to the receiving party or the public prior 
                           to its disclosure under this Agreement;

                  (b)      becomes known to the recovering party or the public 
                           other than by breach of this Agreement;

                  (c)      is disclosed to the receiving party by a third party 
                           having a lawful right to make such disclosure;

                  (d)      is independently developed by  the receiving  party 
                           without use of the disclosure; or


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                  (e)      is required to be disclosed in order to perform the 
                           Agreement.

         The  restrictions  imposed under this Agreement  shall not apply to the
disclosure of any  information  necessary to obtain patents on inventions of the
parties relating to the subject matter of this Agreement, or to comply with U.S.
or foreign  laws or  regulations,  including  laws or  regulations  relating  to
approvals or registrations required for the manufacture or sale of Products.

         7.2  Survival.  Section 7.1 shall  remain in effect for three (3) years
following any termination of this Agreement.

                                  Article VIII
                                  Miscellaneous
                                  -------------

         8.1 Governing Law. This Agreement  shall be construed and the rights of
the  parties  determined  in  accordance  with the laws of the State of  Indiana
excluding any choice of law provisions which would direct the application of the
laws of any other jurisdiction.

         8.2 No  Agency.  Nothing  in  this  Agreement  shall  be  construed  or
interpreted as creating an agency or partnership relationship between Jenner and
Lilly.

         8.3 Captions.  Captions of Articles and Sections of this  Agreement are
for  convenience  only,  and the  construction  of this  Agreement  shall not be
affected by reference to such captions.

         8.4  Severability  of  Provisions.  If any  term or  provision  of this
Agreement or the application  thereof to any person or circumstance shall to any
extent be invalid or  unenforceable,  the  remainder  of this  Agreement  or the
application  of such term or  provision to persons or  circumstances  other than
those as to which it is held invalid or unenforceable shall not be affected, and
each term and provision of this Agreement  shall be valid and be enforced to the
fullest extent permitted by law.

         8.5 Complete Contract. This Agreement contains the entire understanding
between the parties  relating to the subject  matter hereof and  supersedes  all
written  and oral prior  agreements  and  understandings  with  respect  hereto.
Execution of this agreement shall  terminate the Option  Agreement made on March
31, 1994, between Jenner and Lilly.

         8.6  Amendment.  This  Agreement  may not be amended,  supplemented  or
otherwise modified except by an instrument in writing signed by both parties.

         8.7 Assignment.  Without the prior written approval of the other party,
this Agreement may not be assigned by either party except Jenner may assign this
Agreement  without  Lilly's prior  consent to an Affiliate or a party  acquiring
substantially  all of the business to which this Agreement  relates,  whether by
sale, merger, operation of law or otherwise.

         8.8 No Use of Name.  Except as  provided  below,  neither  party  shall
release any  information to any third party  regarding the existence or terms of
this Agreement without the prior



                                       -7-






written  consent  of the other.  This  prohibition  applies  to press  releases,
educational and scientific  conferences,  promotional materials and governmental
filings.  Notwithstanding  the above,  either party may  disclose the  existence
and/or terms of this Agreement in discussions with lenders,  investment bankers,
and other  sources  of  financing  and in  connection  with its  development  of
corporate partnerships. Notwithstanding the above, if Jenner is required by law,
court order or governmental regulation to release information to any third party
regarding the terms of this Agreement,  it shall notify Lilly of this fact prior
to releasing the  information.  Lilly shall have the right to confer with Jenner
regarding  the  necessity  for the  disclosure  and the text of the  information
proposed for release.  Any information  that is released  regarding the terms of
this Agreement shall contain only that information required by law. Jenner shall
be free to distribute  promotional  literature  concerning any Product but shall
not use the name of Lilly without Lilly's prior approval or as required by law.

         8.9 Force  Majeure.  Each party shall be  relieved  of its  obligations
under this Agreement to the extent that fulfillment of such obligations shall be
prevented by events or circumstances  beyond the reasonable control of the party
affected.

         8.10 Consents Not Unreasonably Withheld.  Whenever provision is made in
this  Agreement for either party to secure the consent or approval of the other,
such consent or approval  shall not  unreasonably  be withheld,  and whenever in
this  Agreement  provisions  made for one  party to object  to or  disapprove  a
matter, such objection or disapproval shall not unreasonably be exercised.

         8.11 No Strict  Construction.  This Agreement has been prepared jointly
and shall not be strictly construed against either party.

         8.12  Notice.  Any notice  required or permitted to be given under this
Agreement  shall be in  writing  and shall be  deemed to have been  sufficiently
given for all purposes  hereof if mailed by first class  certified or registered
mail,  postage  prepaid,  addressed  to the party to be  notified at its address
shown below or such other  address as may have been  furnished in writing to the
notifying party.



         To Lilly:          Eli Lilly and Company
                            Attention:  Patent Division; Drop 1117
                            Lilly Corporate Center
                            Indianapolis, Indiana 46285


         To Jenner:         Jenner Technologies
                            1895 Mountain View Drive
                            Tiburon, California 94920
                            Attn: Anthony E. Maida, III

         8.13  Improvements  or  Development.  Lilly shall have no obligation to
perform any development work or make any improvements  concerning a Product. Any
development performed or


                                      -8-







improvements  made by  Jenner  concerning  a Product  shall be made at  Jenner's
expense,  and owned by Jenner and Lilly  shall have no rights,  obligations,  or
liabilities concerning such developments or improvements.

         8.14 Arbitration;  Venue.  Lilly and the Company agree that any dispute
or  controversy  arising  out of, in  relation  to, or in  connection  with this
Agreement, or the validity, enforceability,  construction, performance or breach
thereof, which cannot be resolved by the parties may be submitted to non-binding
arbitration  in San  Francisco,  California,  under the  then-current  Licensing
Agreement Rules of the American Arbitration  Association with one (1) arbitrator
appointed in  accordance  with such Rules.  Lilly and the Company agree that any
claim or suit  arising  out of,  in  relation  to,  or in  connection  with this
Agreement, or the validity, enforceability,  construction, performance or breach
thereof,  shall be  brought in the state or  federal  courts  for Marin  County,
California, if initiated by Lilly, and in the state or federal courts for Marion
County, Indiana if brought by Jenner. The parties hereby consent to the personal
jurisdiction of and exclusive venue in such courts.


                      [THIS SPACE INTENTIONALLY LEFT BLANK]





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         IN WITNESS WHEREOF,  the parties have hereunto affixed their signatures
as of the day and year first written above.

JENNER TECHNOLOGIES                            ELI LILLY AND COMPANY


By: /s/ ANTHONY E. MAIDA, III                  By: /s/ AUGUST M. WATANABE
    --------------------------------              ------------------------------
        Anthony E. Maida, III                          August M. Watanabe, M.D.
        Chief Executive Officer                        Vice President

Date: June 15, 1994                            Date: June 13, 1994
      ------------------------------                 ---------------------------



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