PROGENICS PHARMACEUTICALS INC
10-Q, 1999-08-16
PHARMACEUTICAL PREPARATIONS
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                                UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C.  20549

                                  FORM 10-Q
(Mark One)

[X]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934

     For the quarterly period ended   June 30, 1999
                                    -----------------

                               OR

[ ]  TRANSITION REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934

     For the transition period from                  to
                                    ----------------    ----------------

                       Commission file number 000-23143

                       PROGENICS PHARMACEUTICALS, INC.
                       -------------------------------
            (Exact name of registrant as specified in its charter)

                     DELAWARE                          13-3379479
                     --------                          ----------
         (State or other jurisdiction of            (I.R.S. Employer
          incorporation or organization)          Identification No.)


                         777 Old Saw Mill River Road
                          Tarrytown, New York  10591
                         ---------------------------
                   (Address of principal executive offices)
                                  (Zip Code)

                                (914) 789-2800
                                --------------
             (Registrant's telephone number, including area code)

     Indicate by  check mark  whether the registrant (1) has filed all reports
required to  be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during  the preceding  12 months  (or for  such shorter  period that  the
registrant was  required to  file such  reports), and  (2) has been subject to
such filing requirements for the past 90 days.  Yes   X   No
                                                    -----    -----

     As of  June 30, 1999 there  were 9,446,366  shares of  common stock, par
value $.0013 per share, of the registrant outstanding.

<PAGE>
                  PROGENICS PHARMACEUTICALS, INC.


                               INDEX


                                                            Page No.
                                                            --------
PART I  -  FINANCIAL INFORMATION

Item 1.  Financial Statements

   Condensed Balance Sheets...............................     3

   Condensed Statements of Operations.....................     4

   Condensed Statement of Stockholders' Equity............     5

   Condensed Statements of Cash Flows.....................     6

   Notes to Condensed Financial Statements................     7

Item 2.  Management's Discussion and Analysis of
   Financial Condition and Results of Operations..........    10

Item 3.  Quantitative and Qualitative Disclosures
   about Market Risk......................................    13


PART II  -  OTHER INFORMATION

Item 2.  Changes in Securities and Use of Proceeds........    14

Item 4.  Submission of Matters to a Vote of
   Security Holders.......................................    14

Item 6.  Exhibits and Reports on Form 8-K.................    14


                                      2

<PAGE>
                       PROGENICS PHARMACEUTICALS, INC.
                           CONDENSED BALANCE SHEETS
              AT JUNE 30, 1999 AND DECEMBER 31, 1998 (Unaudited)

                                                     June 30,     December 31,
                                                       1999           1998
ASSETS:                                          --------------  --------------
Current assets:
  Cash and cash equivalents....................   $ 13,384,326    $ 14,437,263
  Marketable securities - short term...........      6,721,736      10,212,876
  Accounts receivable..........................      1,439,619       1,634,480
  Interest receivable .........................        260,599         300,340
  Other current assets.........................        257,222         255,522
                                                  -------------   -------------
      Total current assets.....................     22,063,502      26,840,481

Marketable securities..........................      2,734,195
Fixed assets, at cost, net of accumulated
  depreciation and amortization................      1,167,992       1,045,389
Investment in joint venture....................        100,000
Security deposits and other assets.............         13,745          13,745
                                                  -------------   -------------

      Total assets.............................   $ 26,079,434    $ 27,899,615
                                                  =============   =============

LIABILITIES AND STOCKHOLDERS' EQUITY:

Current Liabilities:
  Accounts payable and accrued liabilities.....   $  1,498,868    $  1,595,665
  Amount due to joint venture..................        500,000
  Capital lease obligations, current portion...        109,142         107,346
                                                  -------------   -------------
     Total current liabilities.................      2,108,010       1,703,011

Amount due to joint venture....................        802,535
Capital lease obligations......................         65,667         117,166
                                                  -------------   -------------
     Total liabilities.........................      2,976,212       1,820,177
                                                  -------------   -------------

Commitments and contingencies

Stockholders' equity:
  Preferred stock, $.001 par value, 14,320,174
    authorized; none issued and outstanding
  Common stock - $.0013 par value, 40,000,000
    authorized; issued and outstanding -
    9,446,366 in 1999, 9,358,207 in 1998.......         12,272          12,166
  Additional paid-in capital...................     44,705,447      44,377,193
  Unearned compensation........................       (851,080)     (1,111,018)
  Accumulated deficit..........................    (20,724,758)    (17,207,993)
  Accumulated other comprehensive
    (loss) income..............................        (38,659)          9,090
                                                  -------------   -------------
     Total stockholders' equity................     23,103,222      26,079,438
                                                  -------------   -------------
     Total liabilities and
       stockholders' equity....................   $ 26,079,434    $ 27,899,615
                                                  =============   =============


       The accompanying notes are an integral part of these statements.

                                      3

<PAGE>
                                   PROGENICS PHARMACEUTICALS, INC.
                                 CONDENSED STATEMENTS OF OPERATIONS
                                             (Unaudited)
<TABLE>
<CAPTION>
                                             For the three months ended        For the six months ended
                                                      June 30,                         June 30,
                                            ----------------------------     ----------------------------
                                                1999            1998             1999            1998
                                            ------------    ------------     ------------    ------------
<S>                                         <C>             <C>              <C>             <C>
 Revenues:
    Contract research and development...    $ 2,245,226     $ 3,616,038      $ 4,859,832     $ 5,329,217
    Research grants.....................        211,500         580,710          423,000         580,710
    Product sales.......................         16,835          29,823           34,815          36,446
    Interest income.....................        289,815         294,211          593,111         663,736
                                            ------------    ------------     ------------    ------------

       Total revenues...................      2,763,376       4,520,782        5,910,758       6,610,109
                                            ------------    ------------     ------------    ------------

 Expenses:
    Research and development............      2,960,354       2,533,911        5,320,634       3,911,441
    General and administrative..........      1,107,930       1,151,773        1,976,668       1,936,983
    Loss in joint venture...............      1,796,934                        1,796,934
    Interest expense....................         15,002           9,337           28,505          18,292
    Depreciation and amortization.......        155,012          82,293          304,782         164,390
                                            ------------    ------------     ------------    ------------

       Total expenses...................      6,035,232       3,777,314        9,427,523       6,031,106
                                            ------------    ------------     ------------    ------------

       Net income (loss)................    $(3,271,856)     $  743,468      $(3,516,765)    $   579,003
                                            ============    ============     ============    ============

 Net income (loss) per share - basic....       $(0.35)          $ 0.08          $(0.37)         $  0.06
                                               =======          =======         =======         ========

 Net income (loss) per share - diluted..       $(0.35)          $ 0.07          $(0.37)         $  0.05
                                               =======          =======        =======          ========

</TABLE>

       The accompanying notes are an integral part of these statements.

                                      4

<PAGE>
PROGENICS PHARMACEUTICALS, INC.
CONDENSED STATEMENT OF STOCKHOLDERS' EQUITY
FOR THE SIX MONTHS ENDED JUNE 30, 1999 (Unaudited)


<TABLE>
<CAPTION>
                                                                                         ACCUMULATED
                             COMMON STOCK      ADDITIONAL                                   OTHER          TOTAL
                         -------------------    PAID-IN      UNEARNED     ACCUMULATED   COMPREHENSIVE  STOCKHOLDERS' COMPREHENSIVE
                           Shares    Amount     CAPITAL    COMPENSATION     DEFICIT     INCOME (LOSS)     EQUITY          LOSS
                         ---------- --------  -----------  ------------  -------------  -------------  ------------- --------------
<S>                      <C>        <C>       <C>          <C>           <C>            <C>            <C>           <C>
 Balance at
   December 31, 1998      9,358,207   12,166  $44,377,193  ($1,111,018)  ($17,207,993)        $9,090    $26,079,438

 Amortization of
   unearned compensation                                       259,938                                      259,938

 Issuance of compensatory                          48,332                                                    48,332
   stock options

 Sale of Common Stock
   under employee stock
   purchase plans and
   exercise of stock
   options and warrants      88,159      106      279,922                                                   280,028


 Net loss                                                                  (3,516,765)                   (3,516,765)   ($3,516,765)

 Change in unrealized
   gain on marketable
   securities                                                                                (47,749)       (47,749)       (47,749)
                          ---------  -------  -----------  ------------  -------------      ---------   ------------   ------------
 Balance at
   June 30, 1999          9,446,366  $12,272  $44,705,447    ($851,080)  ($20,724,758)      ($38,659)   $23,103,222    ($3,564,514)
                          =========  =======  ===========  ============  =============      =========   ============   ============

</TABLE>

       The accompanying notes are an integral part of these statements.

                                      5

<PAGE>
                       PROGENICS PHARMACEUTICALS, INC.
                CONDENSED STATEMENTS OF CASH FLOWS (Unaudited)
               Increase (Decrease) in Cash and Cash Equivalents

                                                     Six months ended June 30,
                                                   ----------------------------
                                                       1999           1998
                                                   -------------  -------------
Cash flows from operating activities:
 Net(loss) income................................  $ (3,516,765)  $    579,003
                                                   -------------  -------------
 Adjustments to reconcile net loss to
  net cash used in operating activities:
   Depreciation and amortization.................       304,782        164,390
   Amortization of discounts, net of
    premiums, on marketable securities...........        61,733         62,889
   Amortization of discount on amount due
    to joint venture.............................         5,601
   Loss in joint venture.........................     1,796,934
   Noncash expenses incurred in
    connection with issuance of common
    stock, stock options and warrants............       308,270        350,006
   Changes in assets and liabilities:
     Decrease (increase) in accounts
     receivable..................................       194,861       (602,322)
     Decrease in prepaid expenses and other
     current assets..............................        38,041
     Decrease in accounts payable and
     accrued expenses............................       (77,104)      (407,937)
     Increase in investment in LLC...............      (600,000)
     Decrease in income taxes payable............                      (25,000)
                                                   -------------  -------------
           Total adjustments.....................     2,033,118       (457,974)
                                                   -------------  -------------
    Net cash (used in) provided by
     operating activities........................    (1,483,647)       121,029
                                                   -------------  -------------
Cash flows from investing activities:
 Capital expenditures............................      (447,078)      (164,461)
 Sale of marketable securities...................     6,955,000
 Purchase of marketable securities...............    (6,307,537)    (8,099,171)
                                                   -------------  -------------
    Net cash provided by (used in)
     investing activities. ......................       200,385     (8,263,632)
                                                   -------------  -------------

Cash flows from financing activities:
 Proceeds from the exercise of stock options and
  other adjustments to stockholders' equity......       280,028        176,601
 Payment of capital lease obligations............       (49,703)       (46,075)
                                                   -------------  -------------
     Net cash provided by financing
      activities.................................       230,325        130,526
                                                   -------------  -------------

     Net decrease in cash and cash
      equivalents................................    (1,052,937)    (8,012,077)
                                                   -------------  -------------

Cash and cash equivalents at beginning
 of period.......................................    14,437,263     21,737,925
                                                   -------------  -------------
     Cash and cash equivalents at
      end of period..............................  $ 13,384,326   $ 13,725,848
                                                   =============  =============

Supplemental disclosure of noncash investing
 and financing activities:
  Fixed assets purchased with capital leases.....  $     60,652   $     20,743
                                                   =============  =============

       The accompanying notes are an integral part of these statements.

                                      6

<PAGE>
                        PROGENICS PHARMACEUTICALS, INC.
                    NOTES TO CONDENSED FINANCIAL STATEMENTS


1.   Interim Financial Statements

The interim  Condensed Financial  Statements of Progenics Pharmaceuticals, Inc.
(the "Company")  have been prepared in accordance with the instructions to Form
10-Q and  Article 10  of Regulation  S-X.  Accordingly, they do not include all
information and  disclosures necessary  for a  presentation  of  the  Company's
financial position,  results of  operations and  cash flows  in conformity with
generally accepted  accounting principles.  In the opinion of management, these
financial  statements  reflect  all  adjustments,  consisting  only  of  normal
recurring  accruals,  necessary  for  a  fair  presentation  of  the  Company's
financial position,  results of operation and cash flows for such periods.  The
results of operations for any interim periods are not necessarily indicative of
the results  for the  full year.   These financial statements should be read in
conjunction with  the financial  statements and  notes thereto contained in the
Company's Annual  Report on  Form 10-K  for the  fiscal year ended December 31,
1998.

2.	Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses as of June 30, 1999 and December 31, 1998
consist of the following:

                                              June 30,          December 31,
                                                1999                1998
                                            ------------        -------------
       Accounts payable                     $ 1,300,761         $ 1,156,442
       Accrued payroll and related costs         41,107             144,615
       Legal and accounting fees payable        157,000             294,608
                                            ------------        -------------
                                            $ 1,498,868         $ 1,595,665
                                            ============        =============

3.   Net Income (Loss) Per Share

     The Company's basic net income (loss) per share amounts have been computed
by dividing  net income  (loss) by the weighted average number of common shares
outstanding during  the respective periods.  For the three and six months ended
June 30,  1999, the  Company reported net losses and, therefore no common stock
equivalents were included in the computation of diluted per share amounts since
such inclusion  would have  been antidilutive.   For  the three  and six months
ended June  30, 1998,  the Company  reported net  income  and,  therefore,  the
calculation of  diluted per share amounts includes all common stock equivalents
with exercise  prices below the average per share price of the Company's common
stock for  the respective  periods. The  calculations of  basic and diluted net
income (loss) per share are as follows:

                                     Net Income                           Per
                                       (Loss)            Shares          Share
                                    (Numerator)       (Denominator)     Amount
                                    ------------      -------------     -------
1999:
Three months-ended June 30, 1999:
               Basic and Diluted:   ($3,271,856)         9,428,955      ($0.35)


Six months-ended June 30, 1999:
               Basic and Diluted:   ($3,516,765)         9,400,728      ($0.37)

1998:
Three months-ended June 30, 1998:
                           Basic:      $743,468          9,020,825       $0.08

Effect of Dilutive Securities:
        Options                                          1,672,167
        Warrants                                           211,233
                                                        ----------
                         Diluted:      $743,468         10,904,225       $0.07


Six months-ended June 30, 1998:
                           Basic:      $579,003          9,008,623       $0.06
Effect of Dilutive Securities:
        Options                                          1,691,153
        Warrants                                           213,174
                                                        ----------
                         Diluted:      $579,003         10,912,950       $0.05


                                      7

<PAGE>
     Options  and  warrants  which  have  been  excluded  from  the diluted per
share amounts because their effect  would  have  been  antidilutive include the
following:

                                      Three Months Ended June 30,
                              -------------------------------------------
                                       1999                  1998
                              ---------------------  --------------------
                                          Wtd. Avg.             Wtd. Avg.
                               Wtd. Avg.  Exercise   Wtd. Avg.  Exercise
                                Number      Price     Number      Price
                              ----------  ---------  ---------  ---------
 Options and warrants with
 exercise prices below the
 average fair market value
 of the Company's common
 stock for the respective
 periods                       3,027,655   $ 6.64

 Options and warrants with
 exercise prices above the
 average fair market value
 of the Company's common
 stock for the respective
 periods                         139,527   $14.54      12,667     $18.09



                                       Six Months Ended June 30,
                              -------------------------------------------
                                       1999                  1998
                              ---------------------  --------------------
                                          Wtd. Avg.             Wtd. Avg.
                               Wtd. Avg.  Exercise   Wtd. Avg.  Exercise
                                Number      Price     Number      Price
                              ----------  ---------  ---------  ---------
 Options and warrants with
 exercise prices below the
 average fair market value
 of the Company's common
 stock for the respective
 periods                       3,045,487   $ 6.59

 Options and warrants with
 exercise prices above the
 average fair market value
 of the Company's common
 stock for the respective
 periods                         83,713    $14.88       3,729     $19.06


4.   Formation of PSMA Development Company LLC

     On  June  15,  1999,  the  Company  and  CYTOGEN  Corporation  ("CYTOGEN")
(collectively, the  "Members") formed  a joint venture in the form of a limited
liability  company  (the  "LLC")  for  the  purposes  of  conducting  research,
development, manufacturing  and marketing  of  products  related  to  prostate-
specific membrane  antigen ("PSMA").   In  connection with the formation of the
LLC, the  Members entered  into  a  series  of  agreements,  including  an  LLC
Agreement, a  License Agreement  and a  Services Agreement  (collectively,  the
"Agreements").   Each Member  made an initial capital contribution of $100,000.
In general, each Member  has  equal  representation  on  the  LLC's  management
committee and equal voting rights and rights to profits and losses of the LLC.

     Under the  LLC Agreement,  as long as the Company is a Member, the Company
is required  to pay to the LLC $2 million in supplemental capital contributions
at certain  defined dates  or upon the achievement of defined milestones by the
LLC, $500,000 of which was paid during June 1999.  Such payments will, in turn,
be paid by the LLC to CYTOGEN in consideration for CYTOGEN granting to the LLC,
under the  License Agreement,  an exclusive  worldwide  license  under  certain
patents and  patent applications  to make,  use,  develop  and  sell  products.
During the six months ended June 30, 1999, the Company recognized its allocated
share of the LLC's loss of approximately $1.8 million, representing the present
value of  the $2  million payments  in connection  with the LLC Agreement.  The
discount on  the investment  in the  LLC will  be amortized as interest expense
over the term of the remaining payments.


                                      8

<PAGE>
     The Company  will engage  in a research program on behalf of the LLC under
the Services Agreement and will be compensated for its services based on agreed
upon terms.   The  Company is  required to  fund the  cost of research up to $3
million.   All inventions  made by  the Company in connection with the Services
Agreement will be assigned to the LLC for its use and benefit.

     The Agreements  generally terminate upon the last to expire of the patents
granted by  the Members to the LLC or upon breach by either party, which is not
cured within 60 days of written notice.

     The Company  accounts for its investment in the LLC in accordance with the
equity method  of accounting.  Selected operating statement data of the LLC for
the three and six months ended June 30, 1999 are as follows:

                        Three Months Ended       Six Months Ended
                          June 30, 1999           June 30, 1999
                        ------------------       ----------------

     Total expenses         $ 1,796,934             $ 1,796,934
                            ------------            ------------

     Net loss               ($1,796,934)           ($1,796,934)
                            ============           =============


5.   Development and License Agreement with Protein Design Labs, Inc.

     Effective April  30, 1999,  the Company  and  Protein  Design  Labs,  Inc.
("PDL")  entered  into  a  Development  and  License  Agreement  (the  "License
Agreement") under  which PDL  agreed  to  develop  a  humanized  antibody  (the
"Technology") on  behalf of the Company and granted to the Company an exclusive
worldwide license  under certain  patents and  patents applications to develop,
use and  sell products  arising from  the Technology  ("Products").   PDL  also
granted to  the Company non-exclusive licenses to PDL technical information, as
defined, and  sublicenses to  PDL licenses  from third  parties to  the  extent
necessary to  enable the  Company to make, use and sell Products.  In addition,
in June  1999 the  Company exercised  its right  under the License Agreement to
acquire an option to obtain a sublicense to certain additional patents and paid
PDL a fee in connection therewith.

     Upon the  achievement  by PDL  of certain performance-based milestones, as
defined, the Company  is required  to make non-refundable payments to PDL.  The
Company is  also required  to pay royalties based on a percentage of net sales,
as defined,  of all Products  for a specified period and  non-refundable annual
maintenance fees under certain conditions. During the six months ended June 30,
1999, the Company  recognized  an expense of  $667,000  in connection with  the
License Agreement.

     The Company  has the  ability to  terminate the  License Agreement upon 60
days prior  written notice.  If terminated  prior  to  payment  of  the  second
milestone, the Company will reimburse PDL for costs and expenses to the date of
termination.   Either party  may terminate  the License Agreement upon 10 or 30
days written  notice of  default in  making scheduled payments or other breach,
respectively, that  is not  cured by  the other  party.  Otherwise, the License
Agreement will  continue until  expiration of  the Company's  obligation to pay
royalties to PDL.


6.   Reclassifications

     Certain reclassifications  have been made to the 1998 Financial Statements
to conform to the 1999 presentation.




                                      9

<PAGE>
Item 2.   Management's  Discussion and  Analysis  of  Financial  Condition  and
Results of Operations

               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

    Certain  statements   in  this   Form  10-Q   constitute   "forward-looking
statements" within  the meaning of the Private Securities Litigation Reform Act
of 1995  (the "Reform Act").  Such forward-looking statements involve known and
unknown risks,  uncertainties and  other factors  which may  cause  the  actual
results, performance or achievements of the Company, or industry results, to be
materially  different   from  any  expected  future  results,  performance,  or
achievements expressed  or implied  by such  forward-looking statements.   Such
factors include,  among others,  the following:    technological  uncertainties
related to  early stage  product  development,  uncertainties  associated  with
preclinical and  clinical testing,  risks relating to corporate collaborations,
the lack  of product  revenue and  the uncertainty of future profitability, the
need for  additional financing  and other  factors set  forth more fully in the
Company's Annual  Report on  Form 10-K  for the  fiscal year ended December 31,
1998 and other periodic filings with the Securities and Exchange Commission.

The following  discussion should  be read  in conjunction  with  the  Company's
Condensed Financial Statements and the related notes thereto.

     General

     Progenics is  a biopharmaceutical  company focusing on the development and
commercialization of  innovative products  for the  treatment and prevention of
cancer and  viral diseases.  The Company commenced principal operations in late
1988 and since that time has been engaged primarily in research and development
efforts,  development  of  its  manufacturing  capabilities,  establishment  of
corporate collaborations  and raising  capital.   In order to commercialize the
principal products  that the  Company has  under development,  the Company will
need  to   address  a  number  of  technological  challenges  and  comply  with
comprehensive regulatory  requirements.   Accordingly, it  is not  possible  to
predict the  amount of  funds that  will be required or the length of time that
will pass  before the  Company receives  revenues from  sales of  any of  these
products.   To date,  product sales  have consisted  solely of limited revenues
from the sale of research reagents.  The Company expects that sales of research
reagents in  the future  will not  significantly increase  over current levels.
The Company's  other sources  of revenues  through  June  30,  1999  have  been
payments received  under its  collaboration  agreements,  research  grants  and
contracts related to the Company's cancer and HIV programs and interest income.

     To date,  a majority  of the Company's expenditures have been for research
and development  activities.    The  Company  expects  that  its  research  and
development expenses  will increase  significantly as its programs progress and
the Company makes filings for related regulatory approvals.  With the exception
of the  years ended  December 31,  1997 and 1998, the Company has had recurring
losses and  had, at  June 30,  1999, an  accumulated deficit  of  approximately
$20,725,000.   The Company  has financed  its operations  primarily through the
private sale and issuance of equity securities, a line of credit that has since
been repaid  and terminated, payments received under its collaboration with the
Bristol-Myers Squibb  Company ("BMS") beginning in July 1997, payments received
under its  collaboration with  F. Hoffmann-La  Roche Ltd and Hoffmann-La Roche,
Inc. ("Roche")  beginning in  January 1998,  funding under  research grants and
contracts, and  the proceeds  of  the  Company's  initial  public  offering  in
November 1997  and the  proceeds from  the exercise  of outstanding options and
warrants.     The  Company  will  require  additional  funds  to  complete  the
development of  its products,  to fund the cost of clinical trials, and to fund
operating losses that are expected to continue for the foreseeable future.  The
Company does  not expect its products under development to be commercialized in
the near future.


                                      10

<PAGE>
Results of Operations

Three Months Ended June 30, 1999 and 1998

     Contract research  and  development  revenue  decreased  to  approximately
$2,245,000 for  the  three  months  ended  June  30,  1999  from  approximately
$3,616,000 for  the three  months  ended  June  30,  1998.    The  decrease  is
attributable to  the receipt  by the  Company of a milestone payment during the
first half  of 1998  pursuant to  the Company's  collaboration with  BMS.   The
Company also  received contract  revenue from the National Institutes of Health
and the  Department of  Defense of approximately $220,000 and $123,000, for the
quarters ended  June 30,  1999 and  1998, respectively.  Revenues from research
grants decreased  to approximately $212,000 for the three months ended June 30,
1999 from approximately $581,000 for the three months ended June 30, 1998.  The
decrease resulted  from the  funding of  a fewer number of grants in the second
quarter of  1999.   Product sales  decreased to  approximately $17,000  for the
three months  ended June  30, 1999  from approximately  $30,000 for  the  three
months ended  June 30,  1998  resulting  from  decreased  orders  for  research
reagents.   Interest income  decreased to  approximately $290,000 for the three
months ended  June 30,  1999 from  approximately $294,000  for the three months
ended June 30, 1998 due to the decrease in cash available for investing.

     Research and  development expenses  increased to  approximately $2,960,000
for the  three months ended June 30, 1999 from approximately $2,534,000 for the
three months  ended June  30, 1998.  The increase  was principally  due to  the
payment of  license fees and the hiring of additional scientists as the Company
expanded its research and development programs in 1999 and the additional costs
in 1999 of conducting the Company's Phase III clinical trials, as the number of
patients enrolled in the trials increased significantly.

     General and  administrative expenses decreased to approximately $1,108,000
for the  three months ended June 30, 1999 from approximately $1,152,000 for the
three months  ended June  30, 1998.   The  decrease was  principally due to the
decrease in legal expenses.

     The Company  recognized a  loss in  its  joint  venture  with  CYTOGEN  of
approximately $1,797,000  for the three months ended June 30, 1999 as the joint
venture expensed license fees.

     Interest expenses  increased to approximately $15,000 for the three months
ended June  30, 1999  from approximately $9,000 for the three months ended June
30, 1998.   The  increase was  principally due  to the  recognition of interest
expense as  the Company  discounted future  capital contributions  to the joint
venture.

     Depreciation and  amortization expense increased to approximately $155,000
for the  three months  ended June  30, 1999  from approximately $82,000 for the
three months  ended June  30, 1998.   The  increase was  principally due to the
purchase of  additional  fixed  assets  and  leasehold  improvements  that  are
amortized over the life of the lease that expires in December 2000.

     The Company's  net  loss  for  the  second  quarter  of  fiscal  1999  was
approximately $3,272,000  compared to  net income of approximately $743,000 for
the second quarter of fiscal 1998.

Six Months Ended June 30, 1999 and 1998

     Contract research  and  development  revenue  decreased  to  approximately
$4,860,000 for the six months ended June 30, 1999 from approximately $5,329,000
for the  six months  ended June  30, 1998  as the  Company received a milestone
payments pursuant  to the  BMS and  Roche agreements  in 1998.   Revenues  from
research grants  decreased to  approximately $423,000  for the six months ended
June 30,  1999 from  approximately $581,000  for the  six months ended June 30,
1998.   The decrease resulted due to the funding of a fewer number of grants in
the first  half of 1999.  Sales of research reagents decreased to approximately
$35,000 for  the six  months ended June 30, 1999 from approximately $36,000 for
the six  months ended  June 30,  1998 as  orders  for  such  reagents  remained
constant.   Interest income  decreased to  approximately $593,000  for the  six
months ended June 30, 1999 from approximately $664,000 for the six months ended
June 30, 1998 due to the decrease in cash available for investing.


                                      11

<PAGE>
     Research and  development expenses  increased to  approximately $5,321,000
for the  six months  ended June  30, 1999 from approximately $3,911,000 for the
six months  ended June  30, 1998.   The  increase was  principally due  to  the
payment of  license fees  and the  hiring of  new  scientists  as  the  Company
expanded its research and development programs in 1999 and the additional costs
in 1999 of conducting the Company's Phase III clinical trials, as the number of
patients enrolled in the trials increased significantly.

     General and  administrative expenses increased to approximately $1,977,000
for the  six months  ended June  30, 1999 from approximately $1,937,000 for the
six months ended June 30, 1998.  The increase was principally due to the hiring
of additional administrative staff.

     The Company  recognized a  loss in  its  joint  venture  with  CYTOGEN  of
approximately $1,797,000  for the  six months  ended June 30, 1999 as the joint
venture expensed license fees.

     Interest expense  increased to  approximately $29,000  for the  six months
ended June  30, 1999  from approximately  $18,000 for the six months ended June
30, 1998.   The  increase was  principally due  to the  recognition of interest
expenses as  the Company  discounted future  capital contributions to the joint
venture.

     Depreciation and  amortization expense increased to approximately $305,000
for the  three months  ended June  30, 1999 from approximately $164,000 for the
three months  ended June  30, 1998.   The  increase was  principally due to the
purchase of  additional  fixed  assets  and  leasehold  improvements  that  are
amortized over the life of the lease that expires in December 2000.

     The Company's  net loss  for the  six  months  ended  June  30,  1999  was
approximately $3,517,000  compared to  net income of approximately $579,000 for
the six months ended June 30, 1998.


Liquidity and Capital Resources

     The Company  has funded  its operations  since inception primarily through
private placements of equity securities, loans that were subsequently converted
into equity  securities, a  line of  credit that  was  repaid  and  terminated,
payments received  under collaboration  agreements including those with BMS and
Roche, an initial public offering, funding under research grants and contracts,
interest on  investments, and  the proceeds  from the  exercise of  outstanding
options and warrants.

     At June  30, 1999,  the Company  had cash, cash equivalents and marketable
securities  totaling  approximately  $22,840,000  compared  with  approximately
$24,650,000 at  December 31,  1998.   The Company's  facility  lease  has  been
extended to December 2000.  In connection with the extended facility lease, the
Company  expended  approximately  $1.2  million  for  equipment  and  leasehold
improvements during  the period  from January  1, 1998  to June  30,  1999  and
expects that  an additional $400,000 will be spent to enhance its manufacturing
capabilities for  clinical trials  during the  remainder of 1999.  In addition,
the Company is obligated, under the terms of the joint venture with CYTOGEN, to
contribute an additional $1.5 million in license fees through December 31, 2001
and to fund research and development of up to $3.0 million.

     The  Company  believes  that  its  present  capital  resources  should  be
sufficient to  fund operations  at least  through the end of 2000, based on the
Company's current operating plan.  No assurance can be given that there will be
no change that would consume the Company's liquid assets before such time.  The
Company will  require substantial  funds to  conduct research  and  development
activities, preclinical  studies, clinical trials and other activities relating
to the commercialization of any potential products.  In addition, the Company's
cash requirements may vary materially from those now planned because of results
of research  and development  and product testing, potential relationships with
in-licensors and  collaborators, changes  in the  focus and  direction  of  the
Company's research  and development  programs,  competitive  and  technological
advances, the  cost of  filing, prosecuting,  defending  and  enforcing  patent
claims, the  regulatory approval process, manufacturing and marketing and other
costs associated  with the  commercialization of  products following receipt of
regulatory approvals  and other factors.  The Company has no committed external
sources of  capital and,  as discussed  above, expects  no significant  product
revenues for a number of years as it will take at least that much time to bring
the Company's products to the commercial marketing stage.  The Company may seek
additional financing,  such as  through future  offerings  of  equity  or  debt
securities or agreements with corporate partners and collaborators with respect
to the  development of  the Company's  technology, to  fund future  operations.
There can  be no  assurance, however,  that the  Company will be able to obtain
additional funds on acceptable terms, if at all.


                                      12

<PAGE>
Year 2000 Compliance

The  "Year  2000"  problem  relates  to  many  currently  installed  computers,
software, and other equipment that relies on embedded technology (collectively,
"Business Systems").   These Business Systems are not capable of distinguishing
21st century  dates from  20th century  dates.   As  a  result,  subsequent  to
December 31,  1999, Business  Systems used  by many  companies, in  a very wide
variety of applications, will experience operating difficulties unless they are
modified, upgraded,  or replaced  to adequately  process information involving,
related to  or dependent upon the century change.  If a Business System used by
the Company  or a  third party  dealing with  the Company  fails because of the
inability of  the Business  System to  properly read  a 21st  century date, the
results could  have a  material adverse  effect on  the Company.   The  Company
recognizes the  need to ensure its operations will not be adversely impacted by
Year 2000  Business Systems failures and has established a team to address Year
2000 risk.   The  team is  reviewing the  Company's internal infrastructure and
believes that it has identified substantially all of the major Business Systems
used in connection with its internal operations.  The Company has commenced the
process of  identifying and correcting the major Business Systems that may need
to be  modified, upgraded,  or replaced,  and expects to complete this process,
along with remedial actions, before the end of 1999.  Costs incurred to date to
correct Year  2000 problems  have been  immaterial.   The Company estimates the
total cost to complete any required modifications, upgrades, or replacements of
affected Business  Systems will  not have  a material  impact on  the Company's
business or  results of  operations.  This estimate is being monitored and will
be revised,  if necessary,  as additional  information becomes  available.  The
Company also  recognizes the  risk that  suppliers of  products, services,  and
collaborators with whom the Company transacts business on a worldwide basis may
not comply  with Year  2000 requirements.   The  Company has  initiated  formal
communications with  significant suppliers  and collaborators  to determine the
extent to  which the  Company is  vulnerable if  these third  parties  fail  to
remediate their own Year 2000 issues.  The review is ongoing and the Company is
unable to  determine, at  this time, the probability that any material supplier
or collaborator  will not  be able to correct any Year 2000 problem in a timely
manner.   In the  event any  such third parties cannot provide the Company with
products, services,  or continue  the  collaborations  with  the  Company,  the
Company's results  of operations could be materially adversely affected.  Based
on the  above, the  Company has yet to develop a comprehensive contingency plan
with respect  to the  Year 2000  problem.  The Company will continue to monitor
its own  Business Systems  and, to  the extent  possible, evaluate the Business
Systems of  its third  party suppliers  and collaborators to ensure progress on
this critical  matter.   However, if  the Company  identifies significant risks
related to  the Year  2000 compliance  or progress  deviates  from  anticipated
timelines, the  Company will  develop contingency  plans as deemed necessary at
that time.


Item 3. Quantitative and Qualitative Disclosures about Market Risk

     At June  30, 1999,  the Company  did not  hold any  market risk  sensitive
instruments.


                                      13

<PAGE>
                         PART II  -  OTHER INFORMATION

Item 2.  Changes in Securities and Use of Proceeds

(d)  As of  June 30, 1999, $17,112,000 of the $17,112,000 net proceeds from the
     Company's initial  public offering,  has  been  applied  to  research  and
     development and  general  operating  expenses.    With  the  exception  of
     compensation paid  to the  officers and  certain of  the directors  of the
     Company as  employees or  consultants,  no  amounts  paid  in  respect  of
     operating expenses  were paid  to directors  or officers of the Company or
     their associates,  to any person owning 10% or more of any class of equity
     securities of the Company or to any affiliates of the Company.


Item 4.  Submission of Matters to a Vote of Security Holders

At the  Annual Meeting of Stockholders of the Company held on June 24, 1999 the
following directors (constituting all of the directors) were elected:

          Paul J. Maddon, M.D., Ph.D.
          Charles A. Baker
          Kurt W. Briner
          Mark F. Dalton
          Stephen P. Goff, Ph.D.
          Paul F. Jacobson
          Ronald J. Prentki
          David A. Scheinberg, M.D., Ph.D.

     The voting  consisted of  6,463,545 votes cast for each director and 1,825
votes withheld.

     Also voted  upon at  the meeting  was the  ratification of  the  Board  of
Director's selection  of PricewaterhouseCoopers,  LLP to serve as the Company's
independent auditors for the fiscal year ending December 31, 1999, which matter
was approved with 6,454,532 votes in favor and 10,838 abstentions.


Item 6.  Exhibits and Reports on Form 8-K

(a)  Exhibits

     +10.33 - Development and License Agreement effective as of April 30, 1999,
              between Protein Design Labs, Inc. and Registrant

     +10.34 - PSMA/PSMP License  Agreement,  dated  June 15, 1999, by and among
              Registrant, CYTOGEN Corporation  and PSMA Development Company LLC

     +10.35 - Limited Liability Company Agreement  of PSMA Development Company,
              dated June 15, 1999, by and among Registrant, CYTOGEN Corporation
              and PSMA Development Company LLC

      27    - Financial Data Schedule

(b)  Reports on Form 8-K

     During the quarter ended June 30, 1999, there was no report on Form 8-K.
___________________________________
+ Confidential Treatment Requested




                                      14

<PAGE>
                                  SIGNATURES

     Pursuant to  the requirements  of the Securities Exchange Act of 1934, the
registrant has  duly caused  this report  to be  signed on  its behalf  by  the
undersigned thereunto duly authorized.

                                   PROGENICS PHARMACEUTICALS, INC.

Date:  August 13, 1999             by  /s/ Robert A. McKinney
                                   -------------------------------
                                        Robert A. McKinney
                                          Vice President
                                     (Duly authorized officer
                                      of the Registrant and
                                       Principal Financial
                                     and Accounting Officer)



                                      15

<PAGE>
                                 EXHIBIT INDEX


Exhibit     Description
- -------    -----------------------------------------------------------------
+10.33     Development and License Agreement effective as of April 30, 1999,
           between Protein Design Labs, Inc. and Registrant

+10.34     PSMA/PSMP License Agreement, dated June 15, 1999, by and
           among Registrant, CYTOGEN Corporation and PSMA Development
           Company LLC

+10.35     Limited Liability Company Agreement of PSMA Development Company,
           dated June 15, 1999, by and among Registrant, CYTOGEN Corporation
           and PSMA Development Company LLC

 27         Financial Data Schedule

___________________________________
+ Confidential Treatment Requested

<PAGE>
                                                               Exhibit 10.33


[Confidential treatment  has been  requested for portions of this Agreement.
The portions  of this  Agreement for  which confidential treatment have been
requested are  omitted from  this document;  such portions  are indicated by
asterisks.   The  omitted  material  has  been  filed  separately  with  the
Securities and Exchange Commission.]


                     DEVELOPMENT AND LICENSE AGREEMENT

                                  between

                         PROTEIN DESIGN LABS, INC.

                                    and

                      PROGENICS PHARMACEUTICALS, INC.

<PAGE>
  This Agreement  ("Agreement"), effective  as of  April 30,  1999  ("Effective
Date"),  is  made  by  and  between  PROTEIN  DESIGN  LABS,  INC.,  a  Delaware
corporation  having   offices  at   34801  Campus   Drive,  Fremont,  CA  94555
(hereinafter  "PDL"),   and  PROGENICS   PHARMACEUTICALS,  INC.,   a   Delaware
corporation having offices at 777 Old Saw Mill River Road, Tarrytown, NY  10591
(hereinafter "PROGENICS").

                                   RECITALS

  A.  PROGENICS has developed a murine monoclonal antibody directed against the
CCR5 antigen and designated by PROGENICS as "PRO 140";

  B.   PROGENICS wishes to engage PDL to use commercially reasonable efforts to
use  its   technology  regarding  antibody  humanization  and,  if  elected  by
PROGENICS, an  antibody [ *   *   *  ]  prepared by  PDL in  order to develop a
humanized form  of the  foregoing  murine  monoclonal  antibody  [ *   *   *  ]
prepared by PDL; and

  C.   PDL is  willing to  undertake such  development effort and to license to
PROGENICS rights  to such  humanized antibody under the terms and conditions of
this Agreement.

                                   AGREEMENT

NOW THEREFORE,  in consideration  of the  mutual covenants herein contained and
intending to be legally bound, the parties agree as follows:

1.  DEFINITIONS

  All references  to Exhibits,  Articles and  Sections shall  be references  to
Exhibits,  Articles  and  Sections  of  this  Agreement.  Except  as  otherwise
expressly provided herein, the following terms in this Agreement shall have the
following meanings:

  1.01    "Affiliate" means,  with respect  to a party hereto, any corporate or
other entity  which, directly  or indirectly, controls, is controlled by, or is
under common  control with  such party,  where "control" means the ownership of
not less  than 50%  of the  voting shares  of a  corporation,  or  50%  of  the
decision-making authority as to such other unincorporated entity.

  1.02    "Bulk Product"  means Licensed  Product supplied in a form other than
Finished Product which can be converted into Finished Product.

  1.03    "Cell Line" means a cell line producing the Murine Antibody delivered
by PROGENICS pursuant to Section 2.01(a).

       "[ *   *   *  ]"  means   [ *   *   *  ]  transfected   cell  line   for
production of the Humanized Antibody.

  1.04    "Combination Product(s)"  means any  product containing both an agent
or ingredient which constitutes a Licensed Product and one or more other active
agents or ingredients which do not constitute Licensed Products.

  1.05    "Finished Product(s)  " means any and all Licensed Products in a form
for use  by an  end user  and not  intended for  further  chemical  or  genetic
manipulation or transformation.

  1.06 "First Commercial  Sale" means  the  last  day  of  the  calendar  month
containing the  first sale  of a Licensed Product to an independent third party
following regulatory approval.

  1.07    "Humanized Antibody(ies)"  means the  humanized form  of  the  Murine
Antibody developed by PDL under this Agreement.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

<PAGE>
  1.08    "IND" means  an Investigational  New Drug  Application filed with the
U.S. Food and Drug Administration (including regulatory counterparts thereto in
other countries,  as the  case may  be, the  "FDA") or  equivalent  filings  in
countries other than the U.S.

  1.09    "Licensed Product(s)"  means products,  for  any  use,  incorporating
substantially all  of the  Humanized Antibody  or any  modification, variant or
fragment of  the Humanized  Antibody containing at least one variable region of
the Humanized Antibody.

  1.10    "Murine Antibody(ies)"  means, subject to Section 2.01(b), the murine
monoclonal antibody designated as "PRO 140" directed against the Target Antigen
and selected by PROGENICS for humanization by PDL under this Agreement.

  1.11    "Net Sales" means [ *   *   *  ].

  In the  case of  a Combination  Product for  which the  agent  or  ingredient
constituting a  Licensed Product  and  each  of  the  other  active  agents  or
ingredients not  constituting Licensed  Products have established market prices
when sold  separately, Net  Sales shall  be determined  by multiplying  the Net
Sales for  each such  Combination Product by a fraction, the numerator of which
shall be  the established market price for the Licensed Product(s) contained in
the Combination  Product and  the denominator  of which shall be the sum of the
established market  prices for  the Licensed  Product(s) plus  the other active
agents or ingredients contained in the Combination Product.  When such separate
market prices  are not  established, then  the parties  shall negotiate in good
faith to determine a fair and equitable method of calculating Net Sales for the
Combination Product in question.

  In the  case of  Net Sales of Bulk Products, Net Sales shall be calculated by
multiplying the  units of  Finished Product  to  which  such  Bulk  Product  is
reasonably anticipated  to be  converted by the established market price of the
Finished Product  on the  date of  sale of the Bulk Product.  By way of example
and without  limitation, units  of Finished Product may be measured in grams or
doses, as appropriate.

  In calculating  Net Sales  of Combination  Products or  Bulk Products  as set
forth above,  the deductions  listed in  clauses (a)  through (d)  of the first
paragraph of this Section 1.11 shall also be applied.

  1.12    "PDL Patent  Rights" means  rights  in  or  to  all  patents,  patent
applications or improvements owned or controlled by PDL directly related to the
humanization of  monoclonal antibodies  and identified on Exhibit A, as well as
any patent  rights directly  related to the humanization of antibodies directed
against the  Target Antigen  resulting from  or arising  as a  result of patent
applications filed  prior to or during the term of this Agreement by PDL in the
U.S.  or  any  foreign  jurisdiction,  including  any  addition,  continuation,
continuation-in-part  or   division  thereof   or  any  substitute  application
therefor; any  patent issued  with respect  to  such  patent  application,  any
reissue, reexamination,  extension or patent term extension of any such patent,
and any  confirmation patent or registration patent or patent of addition based
on any such patent, including any supplementary protection certificates.

  1.13    "PDL [ *   *   *  ] Patent Rights" means rights in or to all patents,
patent applications or improvements owned or controlled by PDL directly related
to PDL's  proprietary [ *   *   *  ]  and identified in Section 1 of Exhibit C,
resulting from  or arising as a result of patent applications filed prior to or
during the  term  of  this  Agreement  by  PDL  in  the  U.S.  or  any  foreign
jurisdiction, including  any addition,  continuation,  continuation-in-part  or
division thereof or any substitute application therefor; any patent issued with
respect to  such patent  application, any  reissue, reexamination, extension or
patent term  extension of  any such  patent, and  any  confirmation  patent  or
registration patent  or patent  of addition based on any such patent, including
any supplementary protection certificates.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      2

<PAGE>
  1.14    "PDL  Technical   Information"  means   any   and   all   inventions,
discoveries, know-how,  trade secrets, information, experience, technical data,
formulas, procedures,  results or materials (including any biological materials
and samples)  which are  rightfully held  by PDL at any time during the term of
this Agreement  and which  technical  information  is  required  or  reasonably
necessary for  the registration,  development, manufacture,  use or sale of the
Humanized Antibody  or any  modification, variant or fragment thereof; provided
that in  no event  shall PDL  Technical Information include general information
related to  the manufacture  (e.g., cell culture, fermentation, formulation) or
purification of  monoclonal antibodies  except as  may  be  agreed  upon  in  a
separate written agreement between the parties.

  1.15    "PROGENICS Technical  Information"  means  any  and  all  inventions,
discoveries, know-how,  trade secrets, information, experience, technical data,
formulas, procedures,  results or materials (including any biological materials
and samples) which are rightfully held by PROGENICS at any time during the term
of this  Agreement and  which technical  information is  required or reasonably
necessary for PDL to carry out the activities contemplated by this Agreement.

  1.16    "Target Antigen"  means the CCR5 antigen or such other antigen as may
be designated in accordance with Section 2.01(b).

  1.17    "Third Party  [ *   *   *  ] Patent  Rights"  means  the  sublicenses
available from  third parties  for a Licensed Product containing [ *   *   *  ]
prepared by PDL as identified in Section 2 of Exhibit C.

  1.18    "Valid Claim"  means any  claim in  any issued patent included in the
PDL Patent  Rights which  has not  been disclaimed  or  held  unenforceable  or
invalid by  a governmental  agency or  court of  competent  jurisdiction  by  a
decision beyond right of review.


2.  HUMANIZATION PROGRAM; OTHER MATTERS

  2.01  Delivery of Murine Antibody; [ *   *   *  ].

  (a)   Promptly after  execution of this Agreement, PROGENICS shall provide to
PDL a  minimum of three (3) vials of the Cell Line containing approximately one
(1) milliliter  each of frozen cell culture at a concentration ranging from 1 x
106 to  5 x  106 cells  per milliliter,  together with  any PROGENICS Technical
Information which would be useful in assisting PDL to accomplish the objectives
of this Agreement.

  (b)   Through [ *   *   *  ]  (i.e., until  midnight California  time on that
date), PROGENICS  shall have  a one-time  right, upon written notice to PDL, to
terminate the  Program as it relates to the Murine Antibody.  PROGENICS may, at
the time of such termination or at any other time through [ *   *   *  ] (i.e.,
until midnight California time on that date), [ *   *   *  ].

  2.02   Humanization Program.   Upon  receipt of  the Cell  Line,  subject  to
Section 2.06,  PDL shall  promptly commence  and  diligently  use  commercially
reasonable efforts  to apply its humanization technology to the Murine Antibody
selected by  PROGENICS with the objective of producing a Humanized Antibody and
a cell  line that expresses the Humanized Antibody (hereinafter, the "Program")
having the  properties described  below.   The Program  will  be  conducted  as
follows:

     (a)  Phase IA--Humanized Antibody Development; Minimum Binding Affinity.
     PDL will  carry out  the necessary efforts to produce a Humanized Antibody
[ *   *   *  ]  and   having  a   binding  affinity   constant  not  less  than
[ *   *   *  ] that  of the  Murine Antibody  (hereinafter the "Minimum Binding
Affinity") and  will provide  PROGENICS with [ *   *   *  ] as well as supply a
sufficient  quantity  of  that  Humanized  Antibody  for  evaluation  to  allow
PROGENICS to  confirm that  the Humanized  Antibody meets  the Minimum  Binding
Affinity.   PDL shall  deliver a written confirmation that it believes that the
Humanized Antibody  possesses the  Minimum Binding  Affinity together  with the
evaluation materials.   PROGENICS shall promptly conduct such evaluation using,
if technically  possible, the method of competitive binding set forth in Queen,
et al.,  Proceedings of the National Academy of Sciences, USA, 86, 1030 (1989).
If it is not technically possible to use the method set forth in Queen, et al.,
the parties  shall consult  in good  faith to  agree upon a mutually acceptable
alternative method.   The  results of such tests shall be promptly communicated
to PDL and all written results will be provided to PDL as soon as practicable.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      3

<PAGE>
     (b)     Phase  IB--Humanized   Antibody;  Verification;  Minimum  Anti-HIV
Activity.   Promptly following  delivery of  the Humanized Antibody pursuant to
Section 2.02(a),  PROGENICS shall  also  evaluate  the  Humanized  Antibody  to
determine whether  such antibody also possesses anti-HIV activity not less than
[ *   *   *  ].

     In the  event that  the supplied Humanized Antibody does not meet both the
Minimum Binding Affinity and the Minimum Anti-HIV Activity or is, in PROGENICS'
sole discretion,  not sufficiently  close thereto  to proceed with development,
PROGENICS shall promptly inform PDL accordingly in writing.  PDL shall then use
commercially reasonable  efforts to  produce another  Humanized Antibody  in an
effort to  achieve the  Minimum  Binding  Affinity  and  the  Minimum  Anti-HIV
Activity.   PROGENICS acknowledges  and agrees  that achievement of the Minimum
Biological Activity may require use of another IgG isotype, which isotype shall
be reasonably acceptable to PROGENICS.  In any event, the quantity of Humanized
Antibody required  by PROGENICS  for evaluation under Phase IA and IB shall not
exceed approximately 5 mg in the aggregate.

     In the  event that the second Humanized Antibody does not meet the Minimum
Binding Activity  and the  Minimum Anti-HIV  Activity or is, in PROGENICS' sole
discretion, not  sufficiently close thereto to enable PROGENICS to proceed with
development, then the parties shall consult in good faith in order to determine
how to proceed with further development.

     In  the  event  that  PROGENICS  determines  that  one  of  the  Humanized
Antibodies provided  by PDL  meets the Minimum Binding Affinity and the Minimum
Anti-HIV Activity,  or is  sufficiently close  thereto to  enable PROGENICS  to
proceed with  the Humanized  Antibody under  Phase II  of the Program, it shall
promptly notify  PDL in  writing (the  "Phase I  Completion Notice").   At  the
completion of  Phase I, if requested by PROGENICS, PDL will deliver a sample of
(i) a  non-optimized cell  line and  (ii) a DNA vector ("DNA Vector") producing
the Humanized  Antibody to  allow  PROGENICS  to  conduct  research  while  PDL
proceeds with Phase II of the Program.

  (c)  Phase II--Production  Yields.   Following the  completion of Phase I and
delivery by  PROGENICS  of  the  Phase  I  Completion  Notice,  PDL  shall  use
commercially  reasonable   efforts  to   develop  and   transfer  to  PROGENICS
[ *   *   *  ] which  yields at least [ *   *   *  ].  PDL will provide written
notification that the Cell Line possesses the Minimum Yield at the time that it
transfers to  PROGENICS the  sterile (but  free of  chemical  sterilizers)  and
mycoplasma-free [ *   *   *  ], as well as the media to be used by PROGENICS in
order to  confirm the Minimum Yield measured in the same manner as described in
Section 2.02(a) above.

  2.03   Program Risks.  PROGENICS acknowledges that there is no guarantee that
PDL will achieve the objectives of the Program and other requirements specified
herein and  that failure  to achieve any of the objectives of the Program shall
not constitute  a  breach  of  this  Agreement,  provided  that  PDL  has  used
commercially reasonable  efforts to  achieve such  objectives and has otherwise
complied with the terms of this Agreement.

  2.04   Updates.   PDL shall consult with PROGENICS on the Program approach to
be undertaken  by PDL  and shall  provide PROGENICS with monthly updates on the
progress of  the Program.   PDL  shall provide PROGENICS additional information
reasonably requested with respect to the progress and status of the Program.

  2.05  Information.  PDL shall keep written records of its development efforts
under the  Program for such period as may be specified by PDL's internal record
retention policies  with respect  to such  information.   PDL shall  specify in
writing the  applicable retention  periods for  the relevant  records following
completion of  the Program.   PDL  shall cooperate  and in  good faith  provide
copies of or access to any information or records related to the work conducted
under the Program that may be required or reasonably necessary by PROGENICS for
patent prosecution  and maintenance  or regulatory  submissions with respect to
Licensed Products;  provided  that  no  rights  to  the  financial  records  or
information of PDL are granted under this Section 2.05.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      4

<PAGE>
  2.06   [ *   *   *  ].   PROGENICS has  requested that  the Licensed  Product
[ *   *   *  ] prepared  by PDL.  PROGENICS acknowledges and agrees that if the
Licensed Product  [ *   *   *  ] prepared  by PDL,  then the PDL [ *   *   *  ]
and certain  Third Party  [ *   *   *  ] as  identified on  Exhibit C  shall be
required under  this Agreement  and that  the additional royalties set forth in
Section 2  of Exhibit  C, if  applicable, shall  be in  addition  to  royalties
payable to PDL under Section 5.03(a).

3.  OWNERSHIP AND PATENT RIGHTS

  3.01   License Grant.  Subject to the terms and conditions of this Agreement,
PDL hereby grants, and PROGENICS hereby accepts, the following licenses:

     (a)   an exclusive,  worldwide  license,  including  the  right  to  grant
sublicenses, to  develop, make,  have made, import, use, sell, offer to sell or
have  sold   Licensed  Products   and  related   cell  lines,   including   the
[ *   *   *  ];

     (b)   an exclusive,  worldwide, license,  including  the  right  to  grant
sublicenses, under any claims in the PDL Patent Rights that relate specifically
to the  Humanized Antibody  or any  modification, variant  or fragment  of  the
Humanized Antibody  containing at  least the hypervariable region of the Murine
Antibody thereof  (but not  to those  claims which  may  relate  to  any  other
antibodies or  to any  modifications, variants  or fragments  thereof or to any
humanization technology  applicable to  any antibodies other than the Humanized
Antibody) to develop, make, have made, import, use, sell, offer to sell or have
sold Licensed Products;

     (c)   a nonexclusive,  worldwide license,  including the  right  to  grant
sublicenses, to  PDL Technical  Information and those claims in PDL patents and
patent applications  not licensed  under Sections 3.01(b) and 3.01(e) solely to
the extent  required or  reasonably necessary  to enable  PROGENICS to develop,
make, have  made, import,  use, sell,  offer to  sell  or  have  sold  Licensed
Products, provided,  however that  the disclosure  of PDL Technical Information
shall remain  subject to  the confidentiality  obligations set  forth  in  this
Agreement;

     (d)  to the extent PDL is legally permitted and if requested by PROGENICS,
a nonexclusive,  worldwide sublicense under the third party patents licensed to
PDL and  identified on  Exhibit B  solely to  the extent  necessary  to  enable
PROGENICS to develop, make, have made, import, use, sell, offer to sell or have
sold Licensed Products; and

     (e)   if, at  the request  of PROGENICS,  the Licensed  Product contains a
[ *   *   *  ]  prepared   by  PDL,  (i)  a  nonexclusive,  worldwide  license,
including the  right to grant sublicenses, under the [ *   *   *  ] and (ii) to
the extent PDL is legally permitted, a nonexclusive, worldwide sublicense under
the [ *   *   *  ], such license rights under (i) and (ii) solely to the extent
necessary to  enable PROGENICS  to develop, make, have made, import, use, sell,
offer to  sell or  have sold  Licensed  Products  containing  a  [ *   *   *  ]
prepared by PDL.

In any  event, PROGENICS may terminate its rights under Sections 3.01(d) or (e)
(except to the extent expressly provided in Exhibit C) under any specific third
party license (or all such licenses) upon written notice to PDL.

  3.02  PROGENICS' Ownership; Patent Prosecution.

     (a)  PROGENICS shall own any and all inventions, discoveries, concepts and
ideas, whether  patentable or  not, developed  by employees or collaborators of
PROGENICS related to the Murine Antibody.  Nothing contained herein shall grant
or be deemed to grant any right or license, express or implied, by PROGENICS to
PDL or  any other  person  with  respect  to  the  Murine  Antibody,  PROGENICS
Technical Information or any other rights (patent or other) of PROGENICS except
to the  extent required  or reasonably  necessary for  (and then  only for  the
purpose of) the discharge by PDL of its obligations to PROGENICS hereunder.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      5

<PAGE>
     (b)   The results of pharmacological, toxicology, clinical and other tests
and evaluations  relating to  the Humanized  Antibody shall  be the property of
PROGENICS.   PROGENICS agrees  to provide  PDL with a summary of the results of
any pharmacological,  toxicology, clinical  and  other  tests  and  evaluations
relating to the Humanized Antibody conducted by or for PROGENICS for use by PDL
in the  prosecution or  defense of  PDL Patent  Rights.   Except  as  expressly
provided herein,  the disclosure of such information to PDL shall be subject to
the confidentiality  and non-use  provisions of  the confidentiality  agreement
described in Article 8 hereof.

     (c)   PROGENICS shall  have the right to seek and obtain patent protection
in relation  to the  subject matter  of Section  3.02(a) and  (b), as  it deems
appropriate at  its own  cost, without  prejudice, however,  to  the  right  of
involved PDL  employees or  collaborator(s), if any, to be named as inventor(s)
or co-inventor(s) in accordance with applicable patent laws.  PDL shall provide
reasonably required  assistance to  PROGENICS, at  the expense of PROGENICS, in
the event that PROGENICS wishes to seek such patent protection.

     (d)   PROGENICS, in  the name  of and  with the  cooperation of PDL, shall
assume the  filing, prosecution  and maintenance  of  any  patent  applications
directly related  to the  Humanized Antibody under the patents and other rights
licensed by  PDL pursuant  to Section  3.01(b), provided  that the  expenses of
filing, prosecuting  and maintaining  patents and patent applications hereunder
shall be  borne by PROGENICS.  PROGENICS shall provide PDL with reports no less
frequently  than  once  per  calendar  year  listing  all  patents  and  patent
applications filed,  prosecuted or  maintained by  PROGENICS  pursuant  to  the
provisions  hereof,   including  identification   of  the  patents  and  patent
applications by  number and  country, together  with a brief description of the
status of  the prosecution  or patent.   If PROGENICS determines not to file or
not to  continue to  prosecute and  maintain any patent application pursuant to
the terms  of this  Section 3.02(d),  for any  particular invention or country,
PROGENICS shall promptly, and in any event not less than ten (10) business days
prior to  the date  in which  a failure  to file or respond would prejudice the
rights of  PDL hereunder,  notify PDL  in writing of such determination and PDL
shall have  the right,  in its sole discretion, to file, prosecute and maintain
such patent  application at its sole expense and PROGENICS shall cooperate with
PDL in support of such efforts.

  3.03  PDL Ownership.

     (a)   Ownership of  the PDL  Patent Rights  and PDL  Technical Information
developed or  used by  PDL in  furtherance of  the Program conducted under this
Agreement, as  well as  the Humanized  Antibody and  cell lines,  including the
[ *   *   *  ], that  express the Humanized Antibody, shall remain the property
of PDL.  PDL shall own any and all inventions, discoveries, concepts and ideas,
whether patentable  or not,  developed by  employees or  collaborators  of  PDL
related to  the Humanized Antibody, without prejudice, however, to the right of
involved PROGENICS employees or collaborators, if any, to be named as inventors
or co-inventors in accordance with applicable patent laws.

     (b)   Subject to  Section 3.02(d),  PDL shall  have the  right to seek and
obtain patent protection in relation to the subject matter of this Section 3.03
as it  deems appropriate  at its  own cost,  without prejudice, however, to the
right of  involved PROGENICS  employees or collaborator(s), if any, to be named
as inventor(s)  or co-inventor(s)  in accordance  with applicable  patent laws.
PROGENICS will provide reasonably required assistance to PDL, at the expense of
PDL, in the event that PDL wishes to seek such patent protection.

  3.04  Sublicenses.

     (a)   PROGENICS shall  have the  right to  grant sublicenses of its rights
under Section  3.01(a)-(d) and, if applicable, Section 3.01(e), with respect to
Licensed Products,  provided that  PROGENICS shall  remain obligated to pay all
Milestones and  royalties due  to PDL  with respect  to the  sale  of  Licensed
Products by  its assignee  or sublicensee.   In  addition,  the  grant  of  any
sublicenses under  Section 3.01  shall be  on terms  and conditions  which  are
subject to  and subordinate  to the terms of this Agreement and PROGENICS shall
remain fully  responsible to PDL for the performance by PROGENICS' sublicensees
of any  and all such terms applicable thereto.  Promptly following execution of
any sublicense  hereunder, PROGENICS  shall  provide  to  PDL  a  copy  of  the
sublicense agreement.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      6

<PAGE>
     (b)   In the  event that this Agreement is terminated by PDL for breach by
PROGENICS under  Section 9.02(b),  PDL agrees to enter into a license agreement
with any sublicensee of PROGENICS under this Agreement effective as of the date
of termination on substantially the same terms and conditions as this Agreement
(but in  any event  on terms  no less favorable in any material respect to such
sublicensee than  those  terms  pertaining  prior  to  any  such  termination);
provided that  such sublicensee did not cause the breach by PROGENICS resulting
in termination or is not itself in breach.

  3.05  Third Party Rights.

     (a)  Existing Third Party Licenses Available for Sublicense.  If PROGENICS
retains a  sublicense under the third party licenses identified in Exhibit B or
Section 2  of Exhibit  C, such  sublicenses shall  not include  any  additional
payments by  or royalties  from  PROGENICS  to  PDL  for  the  rights  to  such
sublicenses (other  than as  may be  payable to such third parties by PROGENICS
through PDL as set forth in such agreements).  PROGENICS understands and agrees
that the licenses granted to it under this Agreement include sublicenses by PDL
under agreements  between PDL and certain third parties as set forth in Exhibit
B and,  if applicable,  Exhibit C.   PROGENICS understands and agrees that such
sublicenses may  in some  respects be  more  restrictive  than  the  terms  and
conditions of  this Agreement, acknowledges that it has received copies of such
agreements and  agrees to  abide by all terms and conditions of such agreements
applicable to  sublicensees.   During the period PROGENICS elects to retain its
rights under Section 3.01 with respect to the agreements set forth in Exhibit B
and,  if  applicable,  Exhibit  C,  PDL  agrees  to  notify  PROGENICS  if  any
sublicensed agreement  set forth in Exhibit B and, if applicable, Exhibit C, is
either (a)  amended in a manner that materially affects the rights of PROGENICS
hereunder or  (b) terminated.   In the event of a material amendment, PDL shall
provide PROGENICS  with a  copy of  such amended  agreement or a summary of the
amended terms  promptly following  the effective  date of  such amendment.  PDL
agrees not  to  enter  into  any  amendment  of  such  agreements  which  would
materially limit  or restrict  the rights of PROGENICS with respect to Licensed
Products under  the agreement  sublicensed, without  either (i)  procuring  for
PROGENICS the  right to  enter into a sublicense directly with such licensor on
terms and  conditions substantially  similar  to  those  under  the  applicable
sublicense hereunder  (but in  any event  on terms  no less  favorable  in  any
material respect  than those terms pertaining prior to such amendment), or (ii)
obtaining the  prior written  consent of  PROGENICS, which consent shall not be
unreasonably withheld or delayed.

     (b)   Additional Third  Party Licenses.   PDL  shall  in  good  faith  use
commercially reasonable  efforts to  provide to  PROGENICS  on  or  about  each
anniversary of  the Effective  Date a list of third party licenses with respect
to which  PDL has  the right to grant sublicenses that PDL believes may include
claims that  but for  a license  under such agreement would be infringed by the
making, using,  importing, selling  or offering for sale Licensed Products as a
result of  the humanization  efforts of  PDL hereunder  and,  if  elected,  the
[ *   *   *  ] prepared by PDL.  Upon request from PROGENICS, PDL shall provide
a copy of the third party license agreement with respect to which PROGENICS may
desire a  sublicense.  If PROGENICS desires a sublicense under such third party
agreement, PDL  and PROGENICS  shall enter  into an  amendment to  Exhibit B or
Exhibit C,  as the  case may  be, to  include therein  such third party rights,
provided that  as a condition to such amendment, PROGENICS shall pay to PDL any
fees and  payments that  may be  required  in  order  for  PDL  to  grant  such
sublicense (including  reimbursement to PDL of a reasonable share of any of the
fees or payments previously made by PDL for its license).

  3.06   [ *   *   *  ].   If, after  the Effective  Date, PDL  enters into  an
agreement ("Third  Party License")  granting a  license under  the  PDL  Patent
Rights [ *   *   *  ],  to make,  have made,  import, use  or sell  an antibody
binding to  the [ *   *   *  ].  The parties agree to execute such documents as
may be reasonably necessary to carry out the purpose of this Section 3.06.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      7

<PAGE>
  3.07 Diligence Obligations; Non-Humanization.

     (a)   For so  long as PROGENICS is using commercially reasonable effort to
develop and  obtain regulatory  approvals for  Licensed Products, PDL shall not
directly or  indirectly, alone  or with  others, develop any product that is an
antibody or  contains a  variable region  of an  antibody directed  against the
Target Antigen;  provided, however,  that the  foregoing limitation  shall  not
prohibit PDL  from humanizing  an antibody  or  any  modification,  variant  or
fragment of  an antibody  for and  granting a license under the PDL Patents and
PDL Technical  Information to  a third party (to the extent such grant does not
conflict with  Section 3.01)  if PROGENICS  has received  notification from PDL
under Section  6.01(a) and  PROGENICS has  elected not to exercise its right to
enter into  an amendment to this Agreement to obtain [ *   *   *  ] as provided
under Section 6.01.  The term "commercially reasonable efforts" as used in this
Section 3.07(a)  shall mean  that PROGENICS  or its  Affiliate  or  sublicensee
hereunder has:  (a) either  [ *   *   *  ]  or  [ *   *   *  ]  hereunder;  (b)
either   [ *   *   *  ]   or   [ *   *   *  ]   hereunder;   and   (c)   either
[ *   *   *  ] or  [ *   *   *  ] hereunder.   PROGENICS shall provide PDL with
regular, and  in any event not less than annual, written summary reports of the
development efforts  on and progress of the Humanized Antibody and such further
information as  PDL may  reasonably request in connection with any such written
reports in  order to  establish satisfaction  by PROGENICS  of the condition to
PDL's obligation under this Section 3.07.

     (b)  In any event, PDL agrees that for a period of [ *   *   *  ].

4.   CERTAIN ADDITIONAL SUBLICENSE RIGHTS

     4.01  [ *   *   *  ].

     4.02  [ *   *   *  ].

     4.03  [ *   *   *  ].

5.  MILESTONE PAYMENTS; ROYALTIES, REPORTS

  5.01  Milestones.

  (a)   In consideration  for the  efforts and  licenses granted  by PDL  under
Section 3.01,  PROGENICS shall  make payments  upon the  achievement of certain
Milestones as set forth in this Section 5.01(a).  Except as expressly set forth
below (including  as specified  in the  notes to the table), within thirty (30)
days after the achievement of each of the following Milestones, PROGENICS shall
make the  specified non-refundable  and non-creditable  payment to  PDL for the
corresponding Milestone as follows:

  Milestone(1)(2)                      Milestone Payment Amount

  1.  Execution of this Agreement      [ *   *   *  ]

  [ *   *   *  ]                       [ *   *   *  ]

(1) [ *   *   *  ].

(2) Except  as expressly  provided in Section 2.01(b), Milestone payments shall
  be payable  only once, which shall be the first time a Milestone is achieved.
  If a Milestone is skipped or avoided by advancing development of the Licensed
  Product to  a later  development step,  then  the  Milestone  that  would  be
  expected to  occur earlier  shall be deemed to have been achieved at the same
  time the  later Milestone is achieved, and the corresponding payments for the
  Milestones  achieved   shall  be  due.  References  to  clinical  trials  are
  references to  the most  advanced clinical  development stage of the Licensed
  Product as  specified in  the protocol  filed with  the  FDA,  regardless  of
  therapeutic indication  (e.g., a Phase I/II clinical trial shall be deemed to
  trigger Milestone 7).

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      8

<PAGE>
(3) PROGENICS  shall make  the Milestone  1 payment to PDL within ten (10) days
  after execution of this Agreement.

(4) [ *   *   *  ].

(5) [ *   *   *  ].

(6) [ *   *   *  ].

(7) [ *   *   *  ].

  5.02   Payments.   Payment shall  be made  by wire  transfer to the following
account or  such other  account as  may be  specified by  PDL to  PROGENICS  in
writing at least two (2) business days in advance of the date of payment:

                                [ *   *   *  ]

  5.03  Royalties to PDL.

  (a)   Royalties.  Subject to Section 5.03(c) and, if applicable,Section 6.01,
in further  consideration of  the rights  and licenses  granted  by  PDL  under
Section 3.01, PROGENICS shall pay to PDL a royalty of [ *   *   *  ] on the Net
Sales of  all  Licensed  Products  sold  by  PROGENICS  or  its  Affiliates  or
sublicensees.

  (b) Term  of Royalties.   Royalties payable pursuant to Section 5.03(a) shall
be payable with respect to the Net Sales of Licensed Products by PROGENICS, its
Affiliates or sublicensees in each country until the later of

  [ *   *   *  ]

  (c)   Royalty Reductions.  The royalty payable under Section 5.03(a) shall be
subject to  reduction under  certain  circumstances  in  certain  countries  as
described in  this Section  5.03(c); provided  that no  royalty reduction shall
apply in the event of an amendment to this Agreement pursuant to Section 6.01.

     (i)   U.S. and  Major Markets.   In  the U.S.  or in  any Major Market (as
defined in  Section 5.01(a))  country, as  the case  may be,  the royalty under
Section 5.03(a)  shall be  reduced  to  [ *   *   *  ]  in  each  such  country
beginning with  the first quarterly reporting period in which there is no Valid
Claim or  no pending  claim under  PDL Patent Rights that is treated as a Valid
Claim (i.e.,  for purposes of this Section 5.03(c)(i), a pending claim shall be
treated as a Valid Claim so long as such pending claim shall not be pending for
a period  longer than  [ *   *   *  ] from  the Effective Date) in that country
that, but  for the licenses granted to PROGENICS under this Agreement, would be
infringed by the manufacture, use, importation or sale of that Licensed Product
in such  country or  by the manufacture of that Licensed Product in the country
of manufacture.

     (ii)   Rest of  World.  In all countries other than the U.S. and the Major
Market countries ("ROW"), the royalty under Section 5.03(a) shall be reduced to
[ *   *   *  ] in  the ROW  beginning with the first quarterly reporting period
in which  [ *   *   *  ] there  is no Valid Claim or no pending claim under PDL
Patent Rights  that is  treated as  a Valid  Claim (i.e.,  for purposes of this
Section 5.03(c)(ii),  a pending claim shall be treated as a Valid Claim so long
as  such  pending  claim  shall  not  be  pending  for  a  period  longer  than
[ *   *   *  ] from  the Effective  Date) that, but for the licenses granted to
PROGENICS under  this Agreement,  would be  infringed by  the manufacture, use,
importation or  sale of  that Licensed  Product  in  such  country  or  by  the
manufacture of that Licensed Product in the country of manufacture.

     (iii)   Failure to  Maintain PDL  Patent Rights.  Notwithstanding Sections
5.03(d)(i) and  (ii), the  royalty under  Section 5.03(a)  shall be  reduced to
[ *   *   *  ] in  any country  beginning with  the first  quarterly  reporting
period in  which PDL  fails to  maintain issued  patents under  the PDL  Patent
Rights such  that as  a result  of the  failure of  PDL to maintain such issued
patents in  the country  in question, there is no Valid Claim that, but for the
licenses granted  to PROGENICS  under this  Agreement would be infringed by the
manufacture, use,  importation or sale of that Licensed Product in such country
or by  the manufacture  of that Licensed Product in the country of manufacture;
provided that a royalty reduction hereunder shall not apply with respect to any
issued patents in any country that PROGENICS elects not to maintain pursuant to
Section 3.02(d).

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      9

<PAGE>
     (iv)   Competition.   In the  event that  sales in  any given  country  by
independent third parties of a human or humanized antibody directed against the
Target Antigen  ("Third Party  Sales") exceed  [ *   *   *  ] of  the aggregate
gross revenues ("Reduction Threshold") derived by or payable from or on account
of the  sale of  Licensed Products in that country by PROGENICS, its Affiliates
and sublicensees  in any two consecutive quarterly reporting periods hereunder,
PROGENICS shall  inform PDL  in writing  and royalties  payable  to  PDL  under
Section 5.03(a) shall be reduced to [ *   *   *  ] on Net Sales of all Licensed
Products sold  by PROGENICS  or its  Affiliates or sublicensees in that country
beginning with  the  first  quarterly  reporting  period  after  the  Reduction
Threshold is  exceeded for  two consecutive  quarterly  reporting  periods  and
continuing until  the first  quarterly reporting  period after  two consecutive
quarterly reporting  periods in  which Third  Party Sales  no longer exceed the
Reduction Threshold  in that  country.   In addition,  if in  the U.S.  or  any
country which  is a  Major Market  (as defined  in Section 5.01(a)) Third Party
Sales of  units of Licensed Products exceed [ *   *   *  ] of the unit sales of
Licensed Products in that country by PROGENICS, its Affiliates and sublicensees
in any  two consecutive  quarterly reporting periods hereunder, PROGENICS shall
inform PDL  in writing,  and PROGENICS and PDL shall negotiate in good faith on
an equitable  royalty reduction to an amount not less than [ *   *   *  ], with
the goal  of improving  the competitive  position  of  Licensed  Products  with
respect to  "unit sales."   For purposes of identifying unit sales, the parties
shall take  into consideration,  as applicable, varying therapeutic indications
and dosing  regimens, it  being the intent of the parties that unit comparisons
be made as closely as practicable on a units-per-patient basis.

  5.04  Royalties to Third Parties.

  (a)   PROGENICS shall  be solely responsible for the payment of any royalties
payable to  third parties  arising out  of the  manufacture or sale of Licensed
Products by  PROGENICS, its Affiliates or sublicensees, including any royalties
payable under  the third  party licenses  identified on Exhibit B and Exhibit C
(if the  Licensed Product contains [ *   *   *  ] prepared by PDL), which shall
be in  addition to the royalties specified in Section 5.03.  This shall include
all royalties  payable to  third parties pursuant to sublicenses granted by PDL
to PROGENICS  under this  Agreement, which  PROGENICS shall,  if possible,  pay
directly to such third parties.

  (b)   In the  event that  PROGENICS  has  an  existing  sublicense  from  PDL
hereunder and  determines that  it is not possible to pay royalties directly to
third parties  under such  license agreements,  including those  identified  in
Exhibit B  and Exhibit  C (if  the  Licensed  Product  contains  [ *   *   *  ]
prepared by  PDL), PROGENICS  shall  promptly  remit  the  appropriate  royalty
payments to  PDL and PDL shall pay the third party royalties when due under the
terms of PDL's agreement with such third party licensors.

  5.05  Sales Among Affiliates and Sublicensees; Single Royalty.  Sales between
and among  PROGENICS and  its Affiliates  and sublicensees of Licensed Products
which  are  subsequently  resold  or  to  be  resold  by  such  Affiliates  and
sublicensees shall not be subject to royalty, but in such cases royalties shall
accrue upon the occurrence of and be calculated based on any subsequent sale of
such Licensed Products to a non-Affiliate or non-sublicensee.  In any event, no
provision of this Agreement shall be construed as requiring the payment of more
than a  single royalty  for each Net Sale of Licensed Product regardless of the
number of  patentable or  patented claims  under PDL Patent Rights or amount of
PDL Technical  Information incorporated  into such Licensed Product.  By way of
illustration and without limitation, Licensed Products royalties payable to PDL
of [ *   *   *  ]  (excluding royalties  received by PDL payable to third party
licensors from  PROGENICS) shall  represent the  maximum royalty payable to PDL
for licenses under the PDL Patent Rights (regardless of the subsequent issuance
of additional  patents to PDL that may cover Licensed Products) and shall apply
only to  Net Sales of that Licensed Product to the end user customer and not to
any earlier transfer in the chain of distribution of that Licensed Product.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      10

<PAGE>
  5.06    Annual Maintenance  Fee.   In further  consideration of  the licenses
granted under  Section 3.01,  not  later  than  ten  (10)  days  following  the
[ *   *   *  ] anniversary  of the  Effective Date  and  not  later  than  each
anniversary  thereafter,   PROGENICS  shall  pay  PDL  a  nonrefundable  annual
maintenance fee ("Annual Maintenance Fee") in the amount of [ *   *   *  ]. The
Annual Maintenance  Fee shall  not be payable for any annual period immediately
following a  year in  which royalties paid to PDL by PROGENICS (net of offsets,
if any,  other than  the credit  described in  Section 5.03) under Section 5.03
hereof exceed  [ *   *   *  ].   By way of illustration and without limitation,
if PROGENICS  pays  the  Annual  Maintenance  Fee  in  [ *   *   *  ]  and  the
royalties paid to PDL in [ *   *   *  ] exceeded [ *   *   *  ], then no Annual
Maintenance  Fee   for  [ *   *   *  ]  shall  be  payable  in  [ *   *   *  ].
Notwithstanding any  other provision  of this Agreement or the actual Net Sales
of Licensed  Products subject  to reporting  in any quarterly period hereunder,
PROGENICS shall  have the right to report and pay a minimum royalty of at least
[ *   *   *  ] in any reporting period.

  5.07  Withholding.

     (a)   Payments.   All amounts  payable under  Sections 5.01 and 5.06 shall
represent the  actual proceeds  to be  received by  PDL after any deductions or
withholding for  any taxes (other than taxes based on PDL's income) that may be
applicable to  the payment  of any  Milestone hereunder  by reason of PROGENICS
having sublicensed  or otherwise  transferred or assigned any rights under this
Agreement to  which Sections  5.01 and  5.06 pertain  to a person that is not a
U.S. person  for U.S.  federal income  tax purposes.   PDL agrees to reasonably
cooperate with  PROGENICS in  obtaining a  refund, or  otherwise mitigating the
effects, of  any withholding  taxes covered  by the  foregoing sentence paid by
PROGENICS with respect to any payments to PDL hereunder.  In the event that PDL
is successful  in obtaining any refund, or otherwise mitigating the effects, of
tax withholding  amounts paid  by PROGENICS under this Agreement, PDL agrees to
promptly remit the amount of such refund or other benefit to PROGENICS.

     (b)   Royalty Payments.   PROGENICS may withhold from royalties due to PDL
amounts for  payment of  any withholding  tax that  PROGENICS has  paid to  any
taxing authority  with respect to royalties paid to PDL under this Agreement on
the sale  or manufacture  of Licensed Products.  PROGENICS agrees to reasonably
cooperate with  PDL in  obtaining a foreign tax credit in the U.S. with respect
to taxes  withheld on  royalties due  to PDL  on the  sale  or  manufacture  of
Licensed Products.

  5.08   Currency Conversion.   All amounts payable to PDL under this Agreement
shall be  payable in U.S. Dollars by wire transfer to a bank account designated
by PDL.   In the case of royalties on sales, all amounts payable shall first be
calculated in  the currency  of sale and then converted into U.S. Dollars using
the average  of the  daily exchange rates for such currency quoted by Citibank,
N.A. for each of the last fifteen (15) banking days of each calendar quarter.

  5.09   Interest on  Overdue Payments.  PROGENICS shall be liable for interest
on any  overdue payments  under Sections 5.01, 5.03 and 5.06 at the rate of ten
percent (10%) per annum, or the highest rate allowed by law, whichever is less,
commencing on the date such payments are due until paid.

  5.10  Reports.

     (a)   Current Reports.   PROGENICS  agrees to  make  written  reports  and
royalty payments  to PDL  within forty-five  (45) days  after the close of each
calendar quarter during the term of this Agreement, beginning with the calendar
quarter in  which the  date of first sale to an independent third party occurs.
These reports  shall show  Net Sales  of the Licensed Products by PROGENICS and
its Affiliates  for the  calendar quarter  with respect  to which the report is
delivered  as   well  as  Net  Sales  of  the  Licensed  Products  reported  by
sublicensees in that calendar quarter on a country-by-country basis, details of
the quantities  of Licensed  Products sold  in each  country and the country of
manufacture if  different, applicable  offsets, withholding  taxes and  the net
royalty due to PDL thereon pursuant to Article 5.  Concurrently with the making
of each  such report,  PROGENICS shall make any payment due to PDL of royalties
for the period covered by such report.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      11

<PAGE>
     (b)   Termination Report.   If this Agreement terminates at any time after
royalties on  Licensed Products are payable pursuant to Section 5.01, PROGENICS
also agrees  to make  a written report to PDL within ninety (90) days after the
date on  which PROGENICS,  its Affiliates  or sublicensees  last sell  Licensed
Products stating  in such  report the  same information  required by  quarterly
reports for  all such  Licensed Products  made, sold  or otherwise  disposed of
which were not previously reported to PDL.

     (c)   Notification of  Marketing Approval.  PROGENICS agrees to notify PDL
in writing  within sixty  (60) days  after the  date on  which  PROGENICS,  its
Affiliates or  sublicensees obtain  marketing approval of a Licensed Product in
any country.  Such notice shall specify the country in which marketing approval
was obtained and the date of such approval.

  5.11   Inspection  PROGENICS agrees to keep accurate and complete records for
a period  of at  least three (3) years (or such longer period as may correspond
to PROGENICS'  internal records  retention policy) for each reporting period in
which  Net  Sales  occur  showing  the  manufacturing,  sales,  use  and  other
disposition of  Licensed Products  in sufficient detail to enable the royalties
payable hereunder  to be determined, and further agrees to permit its books and
records to  be examined  by an  independent accounting firm selected by PDL and
reasonably  satisfactory   to  PROGENICS,   from  time-to-time  to  the  extent
necessary, but  not more  than once  a year.  Such examination is to be made at
the expense  of PDL,  except in  the event that the results of the audit reveal
that PROGENICS underpaid PDL by [ *   *   *  ] or more, in which case the audit
fees shall  be paid  by PROGENICS.   Any  such discrepancies  will be  promptly
corrected by a payment or refund, as appropriate.

6.  [ *   *   *  ]; ROYALTY BUY DOWN; MANUFACTURING

     6.01  [ *   *   *  ]

     (a)  In the event that [ *   *   *  ], PDL shall promptly notify PROGENICS
in writing  [ *   *   *  ].   PROGENICS shall  have fifteen (15) days following
delivery of  the written notice from PDL to notify PDL that it desires to enter
into an  amendment to  this Agreement  [ *   *   *  ] under  the terms  of this
Section 6.01.   Thereafter,  the parties  shall negotiate  in good faith on the
additional terms  of such  amendment as provided in Section 6.01(b).  Effective
upon the  execution of  such amendment  and the payment of the appropriate non-
refundable, non-creditable  [ *   *   *  ] fee set forth below, [ *   *   *  ].
PROGENICS' right  to enter  into an  amendment to this Agreement [ *   *   *  ]
pursuant to  this Section  6.01 shall  terminate if  PROGENICS either  fails to
timely notify  PDL or  elects not  to exercise its right as provided under this
Section 6.01 following written notification from PDL of a [ *   *   *  ], or if
the parties  fail to reach agreement on additional terms as provided in Section
6.01(b).   The applicable  [ *   *   *  ] shall  be determined  by the  time of
exercise by PROGENICS of its rights hereunder as set forth in the table below.

[ *   *   *  ]

Effective upon  the execution  of an amendment including the terms set forth in
Section 6.01(b) and the payment of the applicable [ *   *   *  ] and subject to
the remaining terms and conditions of this Agreement, [ *   *   *  ].

     (b)  In the event that PROGENICS elects to exercise its rights pursuant to
Section 6.01(a),  for a  period of  thirty (30)  days from  written  notice  of
exercise from PROGENICS hereunder, the parties shall negotiate in good faith to
reach an agreement on the additional terms of [ *   *   *  ], which terms shall
include [ *   *   *  ].

  6.02   Royalty Buy  Down.   For a period of [ *   *   *  ] from the Effective
Date, PROGENICS  shall have  the right  to make  a payment  to PDL  in order to
reduce the royalty payable to PDL pursuant to Section 5.03 as follows:

[ *   *   *  ]

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                     12

<PAGE>
  6.03   Manufacturing by  PDL.   Upon request  by  PROGENICS,  PDL  agrees  to
consider manufacturing  Licensed Products  for and  on behalf  of PROGENICS  on
terms to be reasonably negotiated under a separate contract.  In no event shall
this Section  6.03 be  construed as  an obligation on the part of either party.
If PROGENICS  desires, and if legally permissible, PDL will manage, under terms
and conditions  to be  mutually  agreed  upon,  a  new  manufacturing  facility
financed by  PROGENICS within  or contiguous  to PDL's  existing  manufacturing
facility.

7.  REPRESENTATIONS AND WARRANTIES; INDEMNIFICATION

  7.01  Representations and Warranties.

     (a)   Each party  represents and warrants to the other that it knows of no
legal reason to prevent it from entering into this Agreement.

     (b)   PROGENICS represents  and warrants  that  it  possesses  appropriate
rights to  the Murine  Antibodies for PDL to undertake the Program and that the
performance of this Agreement by PDL will not infringe any patent, trade secret
or other  proprietary rights  of a  third party  with  respect  to  the  Murine
Antibodies.

     (c)   PDL represents and warrants that as of the Effective Date it has the
rights to grant the licenses as provided under Sections 3.01(a), (b) and (c).

     (d)   As of  the Effective  Date, PDL  has not been informed by any of the
third party licensors listed on Exhibit B or Exhibit C that PDL is not entitled
to grant the sublicenses granted under this Agreement.

  7.02     No  Warranty   of  Validity,   Non-Infringement.     PDL  makes   no
representations or  warranties, express  or implied (except as specifically set
forth herein)  with respect  to any cell line (including the [ *   *   *  ]) or
Humanized Antibody  delivered to  PROGENICS under this Agreement and nothing in
this Agreement shall be construed as (a) a warranty or representation by PDL as
to the  validity or  scope of  any PDL  Patent Rights;  or (b)  a  warranty  or
representation that  anything made,  used, sold  or otherwise disposed of under
any license  granted in  this Agreement is or will be free from infringement of
patents, copyrights,  trademarks,  trade  secrets  or  other  rights  of  third
parties.

  7.03   No Other  Warranties by  PDL.   EXCEPT AS  SPECIFICALLY SET  FORTH  IN
ARTICLE 7,  PDL MAKES  NO REPRESENTATIONS  OR WARRANTIES  OF ANY  KIND,  EITHER
EXPRESS OR  IMPLIED, WITH  RESPECT TO  ANY  CELL  LINES,  ANTIBODIES,  LICENSED
PRODUCTS OR OTHER MATERIALS DELIVERED TO PROGENICS UNDER THIS AGREEMENT AND PDL
FURTHER MAKES  NO EXPRESS  OR IMPLIED  WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A  PARTICULAR PURPOSE,  OR THAT  THE USE  OF ANY  CELL  LINES,  ANTIBODIES,
LICENSED  PRODUCTS  OR  OTHER  MATERIALS  DELIVERED  TO  PROGENICS  UNDER  THIS
AGREEMENT WILL NOT INFRINGE ANY THIRD PARTY RIGHTS.

  7.04   No Other Warranties by PROGENICS.  EXCEPT AS SPECIFICALLY SET FORTH IN
ARTICLE 7, PROGENICS MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND, EITHER
EXPRESS OR  IMPLIED, WITH  RESPECT TO  ANY CELL  LINES,  ANTIBODIES,  PROGENICS
TECHNICAL INFORMATION  OR OTHER MATERIALS DELIVERED TO PDL UNDER THIS AGREEMENT
AND PROGENICS FURTHER MAKES NO EXPRESS OR IMPLIED WARRANTIES OF MERCHANTABILITY
OR FITNESS  FOR A  PARTICULAR PURPOSE,  OR THAT  THE USE  OF  ANY  CELL  LINES,
ANTIBODIES, PROGENICS TECHNICAL INFORMATION OR OTHER MATERIALS DELIVERED TO PDL
UNDER THIS AGREEMENT WILL NOT INFRINGE ANY THIRD PARTY RIGHTS.

  7.05   PROGENICS Diligence.   PROGENICS  acknowledges the  provisions of this
Article 7  and agrees  that, subject to Section 7.06, it is responsible for and
has conducted  its own  investigation and  analysis  of  the  patent  or  other
proprietary rights  of third  parties  and  the  possibility  of  infringements
thereof, that  it understands  the complexity and uncertainties associated with
possible claims  of infringement of patent or other proprietary rights of third
parties, particularly those relating to pharmaceutical products.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      13

<PAGE>
  7.06  Indemnification.  PROGENICS shall at all times, during the term of this
Agreement and  thereafter, indemnify  and hold harmless PDL and its Affiliates,
sublicensees,  directors,  officers,  agents  and  employees  from  any  claim,
proceeding, loss,  expense, and liability of any kind whatsoever (including but
not limited to those resulting from death, personal injury, illness or property
damage and including legal expenses and reasonable attorneys' fees) arising out
of or  resulting from  the development,  manufacture,  holding,  use,  testing,
advertisement, sale  or other  disposition  by  PROGENICS,  its  Affiliates  or
sublicensees, or  any distributor,  customer or  representative of PROGENICS or
any one  in privity therewith, of any Licensed Product or of any cell lines (or
their progeny  or derivatives,  other biological  materials,  method,  process,
device or  apparatus) or  Humanized Antibody  licensed or  provided by  PDL  to
PROGENICS hereunder; provided, however, that the foregoing indemnity obligation
shall not apply where such claim, proceeding, loss, expense or liability is the
result of the gross negligence or willful misconduct of PDL.  In the event that
such claim, loss, expense or liability is the result of the gross negligence or
willful misconduct  of PDL,  PDL shall  correspondingly indemnify PROGENICS and
its Affiliates, sublicensees, directors, officers, agents and employees.

  7.07   Immunity.   During the  term of  this Agreement  and for  so  long  as
PROGENICS is not in material breach hereof, PDL grants to PROGENICS an immunity
from suit  by PDL with respect to Licensed Products under the PDL Patent Rights
and, if  applicable, the PDL [ *   *   *  ].  Nothing herein shall be construed
as a  waiver of  any rights  of PDL  at law  or equity otherwise available as a
remedy to PDL for a breach of this Agreement by PROGENICS.

8.  CONFIDENTIALITY

  The provisions of that certain Confidentiality Agreement entered into between
PDL and  PROGENICS of  July 31,  1997, a  copy of  which is  attached hereto as
Exhibit D,  are incorporated  by reference  as if  set forth  in their entirety
herein.  Information (as defined in the Confidentiality Agreement) furnished by
a party  to the  other hereunder,  directly or  indirectly,  including  without
limitation any  specifications and data related to the Murine Antibody and Cell
Line and PDL's humanization technology, may be used by the party receiving such
Information, except as otherwise expressly provided, only in furtherance of the
performance of its obligations under this Agreement.  In any event, the term of
the  Confidentiality   Agreement  shall  continue  through  the  term  of  this
Agreement.

9.  TERM AND TERMINATION

  9.01   Term.   Unless earlier  terminated as provided in this Article 9, this
Agreement shall  come into  force on  the date  first set forth above and shall
continue until  later of  the expiration  of the obligation to pay royalties to
PDL or  to PDL's  licensors as  specified in  Section 5.04,  in accordance with
Article 5  above.   Thereafter, this Agreement shall terminate and all licenses
or sublicenses  granted  hereunder  shall  become  fully  paid-up,  irrevocable
licenses.

  9.02  Termination.

     (a)   This Agreement  may be  terminated on  sixty (60) days prior written
notice by PROGENICS; provided that if PROGENICS terminates this Agreement prior
to the  payment of  Milestone 2  for any  reason other  than a  breach of  this
Agreement by PDL, PROGENICS shall reimburse PDL within thirty (30) days of such
termination for  incremental costs and non-cancellable expenses incurred by PDL
in conducting  the Program  to the  date  of  termination  by  PROGENICS.    If
PROGENICS terminates this Agreement after the payment of Milestone 2, PROGENICS
shall have no obligation to reimburse PDL for any costs or expenses incurred by
PDL in conducting the Program.

     (b)   If either  party shall  at any  time default  in the  payment of any
royalty, or  the making  of any  payment required  by this Agreement, the other
party may,  at its  option, terminate this Agreement upon ten (10) days written
notice, provided  that if  the receiving  party shall  have   fully  cured  its
default within  such ten  (10) day  period, then the rights and licenses herein
granted shall  remain in  force as  if no  breach or default had occurred.   If
either party shall at any time breach any material term, condition or agreement
herein other than failure to pay, and shall fail to have initiated and actively
pursued remedy  of any  such default  or breach  within thirty  (30) days after
receipt of  written notice thereof by the other party, that other party may, at
its option,  cancel this  Agreement and  revoke any  rights and licenses herein
granted and  directly affected by the default or breach by notice in writing to
such effect.   Such  act shall  not, however,  prejudice the right of the party
giving notice  to recover  any royalty  or other  sums due  at the time of such
cancellation, and  it being  understood that  if within  thirty (30) days after
receipt of  any such  notice the  receiving  party  shall  have  initiated  and
actively pursued  remedy of  its default,  then the  rights and licenses herein
granted shall  remain in  force as  if no breach or default had occurred on the
part of  the receiving  party, unless  such breach  or default  is not  in fact
remedied within a reasonable period of time.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      14

<PAGE>
     9.03  No Waiver.  The right of either party to terminate this Agreement as
provided herein  shall not  be affected in any way by its waiver of, or failure
to take action with respect to, any previous failure to perform hereunder.

     9.04   Survival.   Any accrued payment and any rights or obligations under
Articles 5, 7 and 8 shall survive any termination of this Agreement.

10.  MISCELLANEOUS

  10.01   Force Majeure.   Neither  party shall be responsible to the other for
failure or  delay in  performing any of its obligations under this Agreement or
for other non-performance hereof provided that such delay or non-performance is
occasioned by  a cause  beyond the  reasonable control  and  without  fault  or
negligence of  such party,  including, but  not limited  to  earthquake,  fire,
flood, explosion,  discontinuity  in  the  supply  of  power,  court  order  or
governmental interference,  act of  God, strike  or  other  labor  trouble  and
provided that  such party  will inform the other party as soon as is reasonably
practicable and that it will entirely perform its obligations immediately after
the relevant cause has ceased its effect.

  10.02   Validity.   Should one  or several  provisions of the Agreement be or
become  invalid,   then  the  parties  hereto  shall  substitute  such  invalid
provisions by  valid ones,  which in their economic effect come so close to the
invalid provisions  that it  can be  reasonably assumed  that the parties would
have contracted  this Agreement  with those  new provisions.  In the event that
such provisions  cannot  be  determined,  the  invalidity  of  one  or  several
provisions of the Agreement shall not affect the validity of the Agreement as a
whole, unless  the invalid provisions are of such essential importance for this
Agreement that  it is  to be reasonably assumed that the parties would not have
contracted this Agreement without the invalid provisions.

  10.03   Publicity.  PDL and PROGENICS will issue a joint press release in the
form attached  hereto as  Exhibit E  concerning the  parties' entry  into  this
Agreement, identifying  the parties  hereto and  the therapeutic  area  of  the
Humanized Antibody  hereunder, with  the other  contents of  such release to be
reviewed and approved in advance by PDL and PROGENICS, which approval shall not
be unreasonably  withheld.   Except as  required by  law, neither  party  shall
publicly disclose  the terms  and conditions of this Agreement unless expressly
authorized to  do so  by the  other party,  which authorization  shall  not  be
unreasonably withheld.   In any event, PDL shall be entitled to disclose orally
(but not  in writing)  to potential  collaborators or  investors the  aggregate
amount of  Milestones payments  payable hereunder,  provided that  in no  event
shall such amounts be specified in the joint press release.

  10.04   Disputes.   Any claim,  dispute or  controversy arising  out of or in
connection with  or relating  to failure to make a payment under this Agreement
shall be submitted by the parties for adjudication in Federal District Court in
the State of California.

  10.05  Notices.  Any notice or report required or permitted to be given under
this Agreement  shall be  in writing and shall be sent by expedited delivery or
telecopied and  confirmed by  mailing, as  follows and shall be effective three
(3) days after such delivery:

If to PDL:          Protein Design Labs, Inc.
                    34801 Campus Drive
                    Fremont, California  94555  USA
                    Attention:  Chief Executive Officer
                    Fax No.:  (510) 574-1500

     Copy to:       Protein Design Labs, Inc.
                    34801 Campus Drive
                    Fremont, California  94555  USA
                    Attention:  General Counsel
                    Fax No.: (510) 574-1473

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      15

<PAGE>
If to PROGENICS:    Progenics Pharmaceuticals, Inc.
                    777 Old Sawmill River Road
                    Tarrytown, NY 10591  USA
                    Attention: Ronald Prentki, President
                    Fax No.:  (914) 789-2817

     Copy to:       Dewey Ballantine LLP
                    1301 Avenue of the Americas
                    New York, NY 10019 USA
                    Attention:  Donald J. Murray, Esq.
                    Fax No.:  (212) 259-6333

  10.06  Governing Law.  The validity, performance, construction, and effect of
this Agreement  shall be  governed by the laws of the State of California which
are applicable to contracts between California residents to be performed wholly
within California.

  10.07   Entire Agreement.   This  Agreement constitutes  the entire Agreement
between the  parties hereto  with respect  to the  within  subject  matter  and
supersedes all  previous Agreements,  whether written  or oral.  This Agreement
shall not  be changed  or modified orally, but only by an instrument in writing
signed by both parties.

  10.08   Assignment.   The rights of either party under this Agreement may not
be assigned,  and the  duties of  either party  under this Agreement may not be
delegated, without  the prior written consent of the other party, which consent
shall not  be unreasonably  withheld; provided  however, that  either party may
assign this  Agreement without  prior written  consent to  an Affiliate of such
party or  to a  party which  acquires all  or substantially all of that party's
business, whether by merger, sale of assets or otherwise.

  10.09   Export.  Each party acknowledges that the laws and regulations of the
U.S. restrict  the export  and re-export  of commodities  and technical data of
U.S. origin.  Each party agrees that it will not export or re-export restricted
commodities or  the technical  data of  the other party in any form without the
appropriate U.S. and foreign government licenses.

  10.10   Headings.   Any headings  and captions used in this Agreement are for
convenience and reference only and are not a part of this Agreement.

  10.11   Counterparts.   This Agreement  may be  executed  in  any  number  of
counterparts, each  of which  shall be  deemed to  be  an  original,  and  such
counterparts together shall constitute one agreement.

  10.12    Independent Contractors.  The relationship between PDL and PROGENICS
hereunder will  be that of independent contractors and neither party shall have
the authority  to bind or commit the other to any third party.  Nothing in this
Agreement will  be construed  to create a joint venture, partnership, agency or
employer-employee relationship  between the  parties to this Agreement, and PDL
shall be solely responsible for all employment and withholding taxes applicable
to the services provided by its employees and contractors under this Agreement.

  10.13    Other  Collaborations.    Except  as  expressly  stated  herein,  no
provision of  this Agreement  shall be  construed as  proscribing either  party
hereto from collaborating with others on the humanization of antibodies.

  10.14    Updating Exhibits.   At  the request  of PROGENICS, PDL shall update
the Exhibits  to this  Agreement to reflect the inclusion of additional patents
and patent  applications as  contemplated by  this Agreement, provided that PDL
shall not be required to provide updates more frequently than semi-annually.


  IN WITNESS  WHEREOF, the  parties hereto  have duly executed this Development
and License Agreement as of the date first above written.


PROTEIN DESIGN LABS, INC.          PROGENICS PHARMACEUTICALS, INC.

By: /s/  Laurence J. Korn          By: /s/  Ronald J. Prentki
- --------------------------         ---------------------------
Title: Chief Executive Officer         Title:  President
__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      16

<PAGE>
                                   EXHIBIT A

                               PDL Patent Rights

The following are patents and patent applications (also known as
[ *   *   *  ]) as of March 31, 1999 issued and filed in certain countries in
the world and licensed as part of the PDL Patent Rights under the Agreement to
the extent related to the Humanized Antibody or any modification, variant or
fragment of the Humanized Antibody:

[ *   *   *  ]
__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

<PAGE>
                                   EXHIBIT B

   Third Party Rights Sublicensed to PROGENICS as part of PDL Patent Rights


Subject to  Section 5.04  and only  to the  extent necessary  for PROGENICS  to
exercise its  rights under  the licenses  to PROGENICS  under Article 3 of this
Agreement, PDL's  rights under  the following  Agreements, to the extent PDL is
permitted to  sublicense such rights to PROGENICS and as such agreements may be
amended from time to time, are sublicensed to PROGENICS:

[ *   *   *  ]
__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

<PAGE>
                                   EXHIBIT C



                                [ *   *   *  ]
__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

<PAGE>
                                                                  Exhibit 10.34


[Confidential treatment has been requested for portions of this Agreement.  The
portions of this Agreement for which confidential treatment have been requested
are omitted  from this document; such portions are indicated by asterisks.  The
omitted material  has been  filed separately  with the  Securities and Exchange
Commission.]













                          PSMA/PSMP LICENSE AGREEMENT


                              Dated June 15, 1999


                                 by and among

                       PROGENICS PHARMACEUTICALS, INC.,

                              CYTOGEN CORPORATION

                                      and

                         PSMA DEVELOPMENT COMPANY LLC

<PAGE>
                          PSMA/PSMP LICENSE AGREEMENT

          THIS  PSMA/PSMP   LICENSE  AGREEMENT,   dated  June  15,  1999  (this
"Agreement"), is  made by and among Progenics Pharmaceuticals, Inc., a Delaware
corporation having  its place  of business  at 777  Old Saw  Mill  River  Road,
Tarrytown, NY  10591 ("Progenics"), CYTOGEN Corporation, a Delaware corporation
having its  place of  business at 600 College Road East, CN 5308, Princeton, NJ
08540 ("CYTOGEN"),  and  PSMA  Development  Company  LLC,  a  Delaware  limited
liability company  having its  principal place  of business at 777 Old Saw Mill
River Road, Tarrytown, NY  10591 (the "LLC").

          WHEREAS, CYTOGEN  has acquired  certain intellectual property rights,
including patent  rights, relating  to PSMA  and PSMP (as hereinafter defined),
and  may  in  the  future  acquire  additional  intellectual  property  rights,
including patent rights, relating to therapeutics based on PSMA and/or PSMP;

          WHEREAS,   Progenics    has   certain    expertise   in    developing
immunotherapeutics based  on novel  vaccine and  antibody technology and may in
the future  acquire intellectual  property rights,  including  patents  rights,
relating to immunotherapeutics based on PSMA and/or PSMP;

          WHEREAS, Progenics  and CYTOGEN  wish to establish a collaboration to
pursue the  development and  commercialization of immunotherapeutic products or
services  based   on  PSMA   and/or  PSMP  and,  in  order  to  implement  such
collaboration, Progenics  and CYTOGEN  have caused  the LLC to be organized and
have each  become the  owner of  50% of  the  outstanding  ownership  interests
thereof;

          WHEREAS, in  connection with  the organization of the LLC, Progenics,
CYTOGEN and  the LLC  have entered  into a  limited liability company agreement
providing for  the management  of the LLC and the rights and obligations of the
parties thereto;

          WHEREAS, in  furtherance of  the collaboration, each of Progenics and
CYTOGEN desires  to grant  rights to  the  LLC  with  respect  to  intellectual
property rights  now owned or hereafter acquired by Progenics or CYTOGEN in the
Field (as  hereinafter defined),  and Progenics,  CYTOGEN and  the LLC  wish to
provide for certain other matters related to the collaboration in the Field, as
set forth below;

          WHEREAS, CYTOGEN  previously  granted  to  Prostagen  Corporation,  a
Delaware corporation  ("Prostagen"), an  exclusive license  to  certain  rights
related to  PSMA pursuant  to a  PSMA Therapeutics  Sublicense Agreement, dated
December 9,  1996,  by  and  between  CYTOGEN  and  Prostagen  (the  "Prostagen
Agreement");

          WHEREAS, Prostagen  previously granted  to Northwest Clinicals LLC, a
Washington limited  liability  company  ("NWC"),  an  exclusive  sublicense  to
produce, process  or otherwise manufacture and sell PSMA and PSMP pursuant to a
PSMA Production  Sublicense Agreement,  dated as  of July  16, 1997  (the  "NWC
Agreement");

          WHEREAS, prior  to the  date hereof  and in  order to  facilitate the
above-referenced collaboration  among the  parties hereto, CYTOGEN has acquired
100% of  the  outstanding  equity  interests  in  Prostagen,  and  CYTOGEN  and
Prostagen have terminated the Prostagen Agreement to the extent of the Field;

          WHEREAS, CYTOGEN has agreed with Progenics to cause the NWC Agreement
to be  terminated and  to acquire for the LLC, at no cost to the LLC, exclusive
manufacturing rights  in the Field for PSMA and PSMP, and to indemnify and hold
the LLC  harmless for any cost, expense, damage or liability whatsoever related
to CYTOGEN's  inability to grant to the LLC as of the date hereof manufacturing
rights in the Field to PSMA and PSMP;

          WHEREAS, in  order to  pursue the  research and  development programs
contemplated  by  the  above-referenced  collaboration  between  Progenics  and
CYTOGEN, simultaneously  with the  execution and  delivery  of  this  Agreement
Progenics, CYTOGEN  and the  LLC are  entering into  a Services  Agreement (the
"Service Agreement") pursuant to which Progenics is agreeing to perform certain
research and development services.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

<PAGE>
          NOW, THEREFORE,  in consideration  of the  foregoing premises and the
mutual covenants contained herein, the parties hereto agree as follows:

          1.   DEFINITIONS.   For the purposes of this Agreement, the following
terms, whether  used in  the singular  or  plural,  shall  have  the  following
meanings:

               1.1.      Affiliate.    The  term  "Affiliate"  shall  mean  any
person, corporation,  company, partnership,  joint venture  and/or  firm  which
controls, is  controlled by  or is  under common  control with,  a party.   For
purposes of  this definition, "control" shall mean (a) in the case of corporate
entities, direct  or indirect  ownership of  at  least  50%  of  the  stock  or
participating shares entitled to vote for the election of directors, and (b) in
the case  of non-corporate  entities, direct  or indirect ownership of at least
50% of the equity interest with the power to direct the management and policies
of such non-corporate entity.

               1.2.      Commercial Sale.   The  term "Commercial  Sale"  shall
mean the  commercial sale  of a  Licensed Product  to an unrelated third party.
The sale  of a  Licensed Product  distributed or  used for  clinical trials  or
experimental purposes only shall not be considered a Commercial Sale.

               1.3.      Contract Period.   The  term "Contract  Period"  shall
mean the period beginning on the Effective Date and ending on the date on which
this Agreement  shall expire  or terminate in accordance with the provisions of
Section 11 hereof.

               1.4.      CYTOGEN.   The term  "CYTOGEN" shall  have the meaning
set forth in the recitals of this Agreement.

               1.5.      CYTOGEN License.   The  term "CYTOGEN  License"  shall
mean the  license granted by CYTOGEN to the LLC pursuant to Section 3.2 of this
Agreement.

               1.6.      CYTOGEN Technical  Information.    The  term  "CYTOGEN
Technical Information" shall mean Technical Information to the extent, but only
to the  extent, used  or useful  in the  Field in which CYTOGEN has or acquires
during the  Contract Period  a licensable  right; provided,  however, that  any
Technical Information  used or  useful in  the Field in which CYTOGEN currently
has a  licensable right  but which  is not disclosed on Annex A hereto, and any
Technical Information  used or  useful in the Field in which CYTOGEN acquires a
licensable right  after the  date hereof,  shall not  be deemed  to be  CYTOGEN
Technical Information unless and until Progenics shall have expressly consented
in writing pursuant to Section 3.3 hereof.

               1.7.      Effective Date.   The term "Effective Date" shall mean
the date of this Agreement, as set forth on the first page hereof.

               1.8.      FDA.  The term "FDA" shall mean the U.S. Food and Drug
Administration.

               1.9.      Field.  The term "Field" shall mean:

               (a)  any and  all means  of  developing,  making,  having  made,
distributing, using,  offering for  sale, selling,  having sold,  importing  or
exporting  any  Field  Immunogen  and/or  any  vaccine  incorporating  a  Field
Immunogen as a therapeutic, but excluding vaccines for prostate cancer that are
antigen presenting cells isolated from a patient's blood, bone marrow or spleen
and pulsed ex vivo with a Field Immunogen for return to the patient; and

               (b)  any and  all means  of  developing,  making,  having  made,
distributing, using,  offering for  sale, selling,  having sold,  importing  or
exporting any Field Antibody as a therapeutic.

               1.10.     Field Antibody.   The term "Field Antibody" shall mean
a  product   that  incorporates  a  peptide  that  includes  a  complementarity
determining region  of an  antibody recognizing  one or  more Field Immunogens,
including,  without   limitation,  antibodies,   antibody  fragments,  antibody
derivatives such  as humanized  antibodies and  single  chain  antibodies,  and
conjugates of any of the foregoing, but excluding MoAb 7E11.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      2

<PAGE>
               1.11.     Field Immunogen.   The  term "Field  Immunogen"  shall
mean any  immunogen that  derives its  immunogenicity wholly  or in significant
part from  PSMA or  PSMP or  mimetopes thereof,  or  any  combination  of  such
immunogens.

               1.12.     Licensed CYTOGEN  Patent.   The term "Licensed CYTOGEN
Patent" shall  mean any  Patent in  which CYTOGEN  has or  acquires during  the
Contract Period  a licensable right, to the extent, but only to the extent, any
such Patent  is used or useful in the Field; provided, however, that any Patent
used or  useful in  the Field in which CYTOGEN currently has a licensable right
but which  is not disclosed on Annex A hereto, and any Patent used or useful in
the Field  in which  CYTOGEN acquires a licensable right after the date hereof,
shall not  be deemed to be a Licensed CYTOGEN Patent unless and until Progenics
shall have  expressly consented in writing pursuant to Section 3.3 hereof.  The
term "Licensed  CYTOGEN Patent"  shall include  the  rights  (including  Patent
rights) granted to CYTOGEN pursuant to the SKICR Agreement and Wright Agreement
as well as the other Patent rights listed on Annex A hereto.

               1.13.     Licensed CYTOGEN  Product.  The term "Licensed CYTOGEN
Product" shall  mean any product, apparatus, method or service the manufacture,
use, sale,  provision or  practice of which would, in the absence of a license,
infringe one or more claims of a Licensed CYTOGEN Patent.

               1.14.     Licensed Patent.   The  term "Licensed  Patent"  shall
mean any Licensed Progenics Patent or Licensed CYTOGEN Patent.

               1.15.     Licensed Product.   The  term "Licensed Product" shall
mean any Licensed Progenics Product or Licensed CYTOGEN Product.

               1.16.     Licensed  Progenics   Patent.     The  term  "Licensed
Progenics Patent"  shall mean  any Patent  in which  Progenics has  or acquires
during the  Contract Period  a licensable right, to the extent, but only to the
extent, any such Patent is used or useful in the Field; provided, however, that
any Patent  used or  useful in  the Field  in which  Progenics currently  has a
licensable right  but which  is not disclosed on Annex B hereto, and any Patent
used or  useful in  the Field  in which  Progenics acquires  a licensable right
after the  date hereof,  shall not  be deemed to be a Licensed Progenics Patent
unless and  until CYTOGEN shall have expressly consented in writing pursuant to
Section 3.3 hereof.

               1.17.     Licensed  Progenics   Product.    The  term  "Licensed
Progenics Product"  shall mean  any product,  apparatus, method  or service the
manufacture, use, sale, provision or practice of which by the LLC would, in the
absence of  a license,  infringe one  or more  claims of  a Licensed  Progenics
Patent.

               1.18.     Licensed Technical  Information.   The term  "Licensed
Technical Information"  shall mean  the Progenics Technical Information and the
CYTOGEN Technical Information.

               1.19.       Licenses.    The  term  "Licenses"  shall  mean  the
Progenics License and the CYTOGEN License.

               1.20.     LLC.   The term "LLC" shall have the meaning set forth
in the recitals of this Agreement.

               1.21.     LLC Agreement.   The  term "LLC  Agreement" shall mean
the Limited Liability Company Agreement, dated as of even date herewith, by and
among Progenics, CYTOGEN and the LLC, and any amendments thereto.

               1.22.     Major Market.   The term "Major Market" shall mean any
of the  United States,  United Kingdom, France, Germany, Italy, Spain, Japan or
Canada.

               1.23.     Manufacturing Rights.  The term "Manufacturing Rights"
shall have the meaning set forth in Section 4.8 hereof.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      3

<PAGE>
               1.24.     MoAb 7E11.   The  term "MoAb  7Ell"  shall  mean  that
certain antibody  to PSMA known as MoAb 7E11-C5, which such antibody is claimed
in United  States Patent  No 5,162,504, granted November 10, 1992, and entitled
"Monoclonal Antibodies  to a New Antigenic Marker in Epithelial Prostatic Cells
and Serum  of Prostate  Cancer Patients."   The  term "MoAb 7E11"  includes all
subclones claimed in such Patent.

               1.25.     North American  Territory.   The term  "North American
Territory" shall  mean the  United States  of  America  and  Canada  and  their
respective territories and possessions.

               1.26.     NWB.   The term "NWB" shall have the meaning set forth
in the recitals of this Agreement.

               1.27.     NWC.   The term "NWC" shall have the meaning set forth
in the recitals of this Agreement.

               1.28.     NWC Agreement.   The  term "NWC  Agreement" shall have
the meaning set forth in the recitals of this Agreement.

               1.29.     Patent.   The term  "Patent" shall  mean (i) unexpired
letters patent  (including inventor's  certificates) which  have not  lapsed or
been held  invalid or  unenforceable by  a  court  or  administrative  body  of
competent jurisdiction  from which  no appeal  can be  taken or  has been taken
within  the   required  time   period,  including,   without  limitation,   any
substitution, extension,  registration, confirmation,  reissue,  reexamination,
renewal or  any like  filing thereof, and (ii) pending applications for letters
patent that  have not  been the  subject of  a rejection  notice from  which an
appeal cannot  be taken  or in respect of which the applicable period of appeal
has expired,  including, without  limitation,  any  continuation,  division  or
continuation-in-part thereof and any provisional applications.

               1.30.     Prime License.   The  term "Prime  License" shall mean
any license,  including, without  limitation, the  SKICR Agreement, pursuant to
which  Progenics  or    CYTOGEN  has  acquired,  or  acquires  in  the  future,
intellectual property rights licensed to the LLC hereunder.

               1.31.     Progenics.    The  term  "Progenics"  shall  have  the
meaning set forth in the recitals of this Agreement.

               1.32.     Progenics License.  The term "Progenics License" shall
mean the  license granted  by Progenics  to the  LLC pursuant to Section 3.1 of
this Agreement.

               1.33.     Progenics Technical  Information.  The term "Progenics
Technical Information" shall mean Technical Information to the extent, but only
to the  extent, used  or useful in the Field in which Progenics has or acquires
during the  Contract Period  a licensable  right; provided,  however, that  any
Technical Information  used or useful in the Field in which Progenics currently
has a  licensable right  but which  is not disclosed on Annex B hereto, and any
Technical Information used or useful in the Field in which Progenics acquires a
licensable right  after the  date hereof,  shall not  be deemed to be Progenics
Technical Information  unless and  until CYTOGEN shall have expressly consented
in writing pursuant to Section 3.3 hereof.

               1.34.     Prostagen.    The  term  "Prostagen"  shall  have  the
meaning set forth in the recitals of this Agreement.

               1.35.     Prostagen Agreement.   The  term "Prostagen Agreement"
shall have the meaning set forth in the recitals of this Agreement.

               1.36.     PSMA.   The term  "PSMA" shall  mean prostate specific
membrane antigen  as described  in Cancer  Research, 53:227-230  (1993) and  as
described in the U.S. Patent Application Serial Nos. 08/973,337 and 08/394,152,
including continuations  and continuations-in-part,  allelic variations thereof
and nucleic acids encoding the same.

               1.37.     PSMP.   The term  "PSMP" shall  mean prostate specific
membrane peptides,  which include  any peptide  sequence appearing  in  a  PSMA
protein and unique to PSMA proteins, and nucleic acids encoding the same.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      4

<PAGE>
               1.38.     Regulatory Authority.  The term "Regulatory Authority"
shall mean  the applicable governmental authority (which, in the United States,
is the  FDA) that  is responsible  for approval for manufacturing, marketing or
importing a therapeutic agent in a particular country for human use.

               1.39.     Services Agreement.   The  term  "Services  Agreement"
shall have the meaning set forth in the recitals of this Agreement.

               1.40.     SKICR.    The  term  "SKICR"  shall  mean  the  Sloan-
Kettering Institute  for Cancer  Research, a  New York  membership  corporation
having its  principal place of business at 1275 York Avenue, New York, New York
10021.

               1.41.     SKICR Agreement.   The  term "SKICR  Agreement"  shall
mean the  Option and  License Agreement, effective July 1, 1993, by and between
SKICR and  CYTOGEN, as  amended by  amendment no.  1 thereto  effective  as  of
November 22, 1993.

               1.42.     SKICR License.   The  term "SKICR  License" shall mean
the license granted to CYTOGEN pursuant to the SKICR Agreement.

               1.43.     Technical   Information.       The   term   "Technical
Information" shall  mean  unpublished  research  and  development  information,
unpatented  inventions,   formulae,  processes,  know-how,  trade  secrets  and
technical data.

               1.44.     Territory.  The term "Territory" shall mean the entire
world.

               1.45.          [*   *   *]

          2.   REPRESENTATIONS AND WARRANTIES.

               2.1.      By Progenics.   Progenics  represents and  warrants to
CYTOGEN and the LLC as follows:

               2.1.1.    Due Organization.   Progenics  is a  corporation  duly
organized and validly existing under the laws of the State of Delaware.

               2.1.2.    Power to  Act.   Progenics has all necessary corporate
power to  enter into  and perform  its obligations under this Agreement and has
taken all  necessary corporate  action under  the laws of the State of Delaware
and its certificate of incorporation and by-laws to authorize the execution of,
and performance  of its  obligations under,  this Agreement.  Progenics has the
full right,  power and  authority to grant all of the right, title and interest
in the license granted by Progenics under Section 3 hereof.

               2.1.3.    No Default.   Progenics is not in default under, or in
conflict with  respect to,  its certificate  of incorporation or by-laws or any
term or  provision of  any agreement,  mortgage or  indenture to  which it is a
party or  by which any of its properties are bound or any statute, rule, order,
writ, injunction,  decree  or  regulation  applicable  to  it  or  any  of  its
properties that  will preclude  the performance  of its  obligations under this
Agreement in any material respect.

               2.1.4.    No Material  Contracts.   Progenics is  not subject to
any contract  or agreement  that will  preclude or  otherwise conflict with the
performance of its obligations under this Agreement in any material respect.

               2.1.5.    No Conflicts.   Neither  the execution nor delivery of
this Agreement,  the consummation  of the  transactions herein contemplated nor
the fulfillment  of or compliance with the terms and provisions hereof will (i)
require the  consent, approval  or authorization  of, or  notice,  declaration,
filing or  registration with,  any governmental  or  regulatory  authority,  or
violate any  provisions of  law,  administrative  regulation  or  court  decree
applicable to Progenics or (ii) conflict with, result in a breach of any of the
terms,  conditions   or  provisions  of  or  constitute  a  default  under  the
certificate of  incorporation or  by-laws of  Progenics or  of any agreement or
instrument to which it is a party or by which any of its property is bound.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      5

<PAGE>
               2.1.6.    Execution  and   Delivery;   Enforceability.      This
Agreement has been duly executed and delivered and constitutes the legal, valid
and binding  obligation of Progenics, enforceable against it in accordance with
the terms  hereof,  subject,  as  to  enforcement,  to  bankruptcy,  fraudulent
conveyance, insolvency,  reorganization, moratorium  and other laws relating to
or affecting creditors' rights generally and by general equitable principles.

               2.1.7.    Patents in  the Field.   To  Progenics's knowledge, on
the date  hereof Progenics  does not have a licensable right to any Patent used
or useful in the Field except as disclosed on Annex B hereto.

               2.2.      By  CYTOGEN.    CYTOGEN  represents  and  warrants  to
Progenics and the LLC as follows:

               2.2.1.    Due Organization.    CYTOGEN  is  a  corporation  duly
organized and validly existing under the laws of the State of Delaware.

               2.2.2.    Power To  Act.   CYTOGEN has  all necessary  corporate
power to  enter into  and perform  its obligations under this Agreement and has
taken all  necessary corporate  action under  the laws of the State of Delaware
and its certificate of incorporation and by-laws to authorize the execution of,
and performance of its obligations under, this Agreement.  CYTOGEN has the full
right, power and authority to grant all of the right, title and interest in the
licenses granted,  or contingent licenses that may be granted, by CYTOGEN under
Section 3 hereof.

               2.2.3.    No Default.   CYTOGEN  is not  in default under, or in
conflict with  respect to,  its certificate  of incorporation or by-laws or any
term or  provision of  any agreement,  mortgage or  indenture to  which it is a
party or  by which any of its properties are bound or any statute, rule, order,
writ, injunction,  decree  or  regulation  applicable  to  it  or  any  of  its
properties that  will preclude  the performance  of its  obligations under this
Agreement in any material respect.

               2.2.4.    No Material  Contracts.  CYTOGEN is not subject to any
contract or  agreement that  will  preclude  or  otherwise  conflict  with  the
performance of its obligations under this Agreement in any material respect.

               2.2.5.    No Conflicts.   Neither  the execution nor delivery of
this Agreement,  the consummation  of the  transactions herein contemplated nor
the fulfillment  of or compliance with the terms and provisions hereof will (i)
require the  consent, approval  or authorization  of, or  notice,  declaration,
filing or  registration with,  any governmental  or  regulatory  authority,  or
violate any  provisions of  law,  administrative  regulation  or  court  decree
applicable to  CYTOGEN or  (ii) conflict with, result in a breach of any of the
terms,  conditions   or  provisions  of  or  constitute  a  default  under  the
certificate of  incorporation or  by-laws of  CYTOGEN or  of any  agreement  or
instrument to which it is a party or by which any of its property is bound.

               2.2.6.    Execution  and   Delivery;   Enforceability.      This
Agreement has been duly executed and delivered and constitutes the legal, valid
and binding  obligation of  CYTOGEN, enforceable  against it in accordance with
the terms  hereof,  subject,  as  to  enforcement,  to  bankruptcy,  fraudulent
conveyance, insolvency,  reorganization, moratorium  and other laws relating to
or affecting creditors' rights generally and by general equitable principles.

               2.2.7.    SKICR and Wright Agreements.  (a)  Attached as Exhibit
1 is  a true and complete copy of the SKICR Agreement and attached as Exhibit 2
is a  true and  complete copy  of the [*  *  *] Agreement.  No provision of the
SKICR Agreement  or the  [*   *   *] Agreement  has been  amended, modified  or
waived.   All of the rights granted under the SKICR Agreement and the [*  *  *]
Agreement to  CYTOGEN are valid and enforceable, and neither this Agreement nor
the LLC Agreement contravene any provision of such agreements or give rise to a
termination right  thereunder.   The option  described in Section III.A. of the
SKICR Agreement  was duly  and validly exercised by CYTOGEN in a timely manner,
the license  issue fee  described in  Section III.B. of the SKICR Agreement was
paid by  CYTOGEN in  accordance with  such section and the license described in
Section III.C. of the SKICR Agreement was thereupon duly and validly issued.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      6

<PAGE>
               (b)  To  CYTOGEN's   knowledge:    (i) the  representations  and
warranties made  by SKICR  in the  SKICR Agreement  were true  in all  material
respects when made; (ii) there has occurred no act or failure to act that would
render such representations untrue in any material respect if made on and as of
the date  hereof; and  (iii) there exists  no breach  or anticipatory breach by
SKICR or [*  *  *] of any of its material obligations under the SKICR Agreement
or the  [*  *  *] Agreement, respectively.  Each of the SKICR Agreement and the
[*   *   *] Agreement  is in full force and effect, and CYTOGEN has complied in
all material  respects with  its obligations  thereunder.  There does not exist
any default by CYTOGEN under such agreements that, after notice or the lapse of
time or  both, would  constitute a  material event of default or give rise to a
right of  termination thereunder.   CYTOGEN  has neither given nor received any
notice of  termination or  breach under  such agreements.   In the event of any
misrepresentation or  breach of  warranty by  SKICR under  the SKICR Agreement,
CYTOGEN will cooperate with all reasonable requests of the Management Committee
of the  LLC regarding  the assertion  of any  claim or  cause of action against
SKICR for  such misrepresentation or breach of warranty; provided, that the LLC
shall bear  any and  all costs, expenses, liabilities or obligations of CYTOGEN
in connection therewith or arising therefrom.

               2.2.8.    No Litigation, Claims or Conflicts.   (a)  There is no
action, suit,  claim or proceeding pending or threatened against CYTOGEN or, to
CYTOGEN'S knowledge,  SKICR or  [*   *   *] with respect to any of the Licensed
CYTOGEN Patents  or CYTOGEN  Technical Information, either at law or in equity,
before  any   court  or   administrative  agency  or  before  any  governmental
department, commission,  board,  bureau,  agency  or  instrumentality,  whether
United States  or foreign,  relating to  validity, infringement,  ownership  or
otherwise, and  neither CYTOGEN nor, to CYTOGEN's knowledge, SKICR or [*  *  *]
has received any notice that any person may bring such a claim, and CYTOGEN has
no belief  that any  basis or  grounds exists  for any  such actions,  suits or
claims.

               (b)  [*  *  *]

               (c)  There are no proceedings or claims pending in which CYTOGEN
or, to  CYTOGEN's knowledge,  SKICR or  [*   *   *] alleges  that any person is
infringing upon, or otherwise violating, any of the Licensed CYTOGEN Patents or
CYTOGEN Technical  Information, nor  are any  proceedings threatened by CYTOGEN
or, to  CYTOGEN's knowledge,  SKICR or [*  *  *] alleging any such violation or
infringement.

               2.2.9.    Subsisting Rights.   The  Licensed CYTOGEN  Patents in
existence on  the Effective  Date are  in full  force  and  effect,  have  been
maintained to  date and  are not invalid or unenforceable, in whole or in part.
No act  has been  done or omitted to be done which had or could have the effect
of impairing  or dedicating  to the  public, or  entitling any  U.S. or foreign
government authority or any other person to cancel, forfeit, modify or consider
abandoned any  of the  Licensed CYTOGEN  Patents, or give any person any rights
with respect  thereto.   All of  CYTOGEN's rights under the SKICR Agreement and
the [*   *   *] Agreement, and CYTOGEN's ownership rights in the Patents listed
in paragraph 2 of Annex A hereof, are valid, enforceable and free of defects.

               2.2.10.   No Prior  Transfer.   (a) CYTOGEN  has not  previously
sublicensed, assigned, transferred, conveyed or otherwise encumbered its right,
title and  interest in any of the Licensed CYTOGEN Patents or CYTOGEN Technical
Information other  than pursuant  to the  Prostagen  Agreement.    A  true  and
complete copy of the NWC Agreement is attached hereto as Exhibit 2.

               (b)  The Prostagen Agreement has been terminated in its entirety
with respect  to the  Field, and except for the Manufacturing Rights, no rights
in the Field remain outstanding under the Prostagen Agreement and all rights in
the Field  to Patents  and Technical Information granted thereunder (other than
the Manufacturing Rights) have been reacquired by CYTOGEN.

               2.2.11.   Exclusive  Owner,  etc.    CYTOGEN  is  the  sole  and
exclusive licensee  of the rights licensed to CYTOGEN under the SKICR Agreement
and the  [*   *   *] Agreement  and of  the rights  to the  Patents  listed  in
paragraph 2  of Annex  A hereof,  all of  which are owned free and clear of any
liens, charges  and encumbrances,  and no  other person,  corporation or  other
private or  governmental entity  or subdivision  thereof has  or shall have any
claims of  ownership whatsoever  with respect  to such  rights.   There are  no
judgments or settlements against or owed by CYTOGEN relating to such rights.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      7

<PAGE>
               2.2.12.   Confidentiality;  Effective   Waivers.  (a)    Neither
CYTOGEN nor, to CYTOGEN's knowledge, SKICR or [*  *  *] has divulged, furnished
to or  made accessible to any person any trade secrets included in the Licensed
CYTOGEN Patents  or CYTOGEN  Technical Information without prior thereto having
obtained an agreement of confidentiality from such person.

               (b)  CYTOGEN and,  to CYTOGEN's  knowledge, SKICR  and [*  *  *]
have obtained  from all  individuals who  participated in  any respect  in  the
invention or  authorship of  any Licensed  CYTOGEN Patents or CYTOGEN Technical
Information (as  employees, consultants  or otherwise) effective waivers of any
and all  ownership rights of such individuals in such rights and assignments to
CYTOGEN, SKICR or [*  *  *], as applicable, all rights with respect thereto.

               2.2.13.   Patent Prosecution  Disclosure.  CYTOGEN has disclosed
to the  LLC all  of the  prosecution files  of all  of the  patents and  patent
applications licensed to the LLC by CYTOGEN hereunder.

               2.2.14.   Patents in  the Field.  To CYTOGEN's knowledge, on the
date hereof  CYTOGEN does  not have  a licensable  right to  any Patent used or
useful in the Field except as disclosed on Annex A hereto.

          3.   LICENSES.

               3.1.      Grant  by   Progenics.    Subject  to  the  terms  and
conditions herein  contained, Progenics hereby grants to the LLC, to the extent
(but only  to the  extent) of  the Field,  the exclusive (even as to Progenics)
right and license throughout the Territory under the Licensed Progenics Patents
and  the   Progenics  Technical   Information  to  develop,  make,  have  made,
distribute, use,  offer for  sale, sell,  have sold,  import or export Licensed
Progenics Products.

               3.2.      Grant by CYTOGEN.  Subject to the terms and conditions
herein contained,  CYTOGEN hereby grants to the LLC, to the extent (but only to
the extent)  of the Field, the exclusive (even as to CYTOGEN) right and license
throughout the  Territory under  the Licensed  CYTOGEN Patents  and the CYTOGEN
Technical Information  to develop,  make, have made, distribute, use, offer for
sale, sell,  have sold,  import or  export Licensed CYTOGEN Products; provided,
however, that  until such time as the NWC Agreement is terminated in accordance
with Section  4.8 hereof,  the license  granted by CYTOGEN hereunder to make or
have made  Licensed CYTOGEN  Products is  subject to  the manufacturing license
granted to NWC pursuant to the NWC Agreement.

               3.2.1.    Limited Right  to MoAb  7E11.    To  enable  the  LLC,
Affiliates of  the LLC and third party sublicensees to utilize MoAb 7E11 solely
in connection  with the  development, manufacturing,  testing and/or conducting
quality control  tests on  Licensed Products,  CYTOGEN hereby grants to the LLC
the right to use MoAb 7E11 solely for such purposes.

               3.2.2.    Antibody Requirements.  CYTOGEN agrees  to sell to the
LLC its  MoAb 7E11 needs at a purchase price not to exceed CYTOGEN's actual and
direct costs.

               3.2.3.    Contingent License.   In  the event  that  CYTOGEN  is
unable to  supply the  LLC with  its requirements  of MoAb 7E11, CYTOGEN shall,
upon written  request by  the LLC,  provide to  the LLC,  at the  LLC's cost, a
viable sample of a hybridoma capable of producing MoAb 7El1, and license to the
LLC on  a non-exclusive,  royalty-free basis the right to use the hybridoma and
to produce  and use  MoAb 7E11  for the  purposes set  forth in  Section  3.2.1
hereof.

               3.3.      Licensing  of   Additional   Patents   and   Technical
Information.   (a)   If Progenics or CYTOGEN (in either case, the "Non-Offering
Party") identifies  any Patent  or Technical  Information used or useful in the
Field in  which the  other party  (the "Offering Party") has a licensable right
that has  not theretofore  been licensed  to the LLC by the Offering Party, the
Non-Offering Party  may request  the Offering  Party to  offer to  license such
Patent or  Technical Information  to the  LLC pursuant  to the  terms  of  this
Agreement.  Any such request shall be in writing and shall reference the rights
requested to  be licensed.  If so requested, the Offering Party shall make such
an offer  in writing,  and in  connection therewith  shall disclose to the Non-
Offering Party  the nature of the Patent or Technical Information and the terms
on which  the  Offering  Party  owns  or  licenses  such  Patent  or  Technical
Information, and  if such  Patent or  Technical Information  is licensed, shall
provide to the Non-Offering Party an accurate and complete copy of the relevant
license agreement.   The  Offering Party shall offer to make to the LLC and the
Non-Offering Party,  with respect  to such Patent or Technical Information, the
representations and  warranties set  forth in  Annex D  hereto, subject to such
exceptions as shall be identified by the Offering Party.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      8

<PAGE>
               (b)  If after  the date  hereof Progenics  or CYTOGEN (in either
case, also  the "Offering  Party") acquires a licensable right in any Patent or
Technical Information  used or  useful in  the Field,  the Offering Party shall
promptly thereafter  offer in  writing to  license  such  Patent  or  Technical
Information to  the LLC pursuant to the terms of this Agreement.  In connection
with any  such offer,  the Offering  Party shall  disclose to  the other  party
(also, the  "Non-Offering  Party")  the  nature  of  the  Patent  or  Technical
Information and  the terms  on which  the Offering  Party owns or licenses such
Patent or Technical Information, and if such Patent or Technical Information is
licensed, shall provide to the Non-Offering Party an accurate and complete copy
of the relevant license agreement.  In addition, the Offering Party shall offer
to make  to the  LLC and the Non-Offering Party, with respect to such Patent or
Technical Information,  the representations and warranties set forth in Annex C
hereto, subject to such exceptions as shall be identified by such party.

               (c)       If a  license grant  offer is made pursuant to Section
3.3(a) or  Section 3.3(b) hereof, the Non-Offering Party shall have 30 calendar
days to  determine whether  to cause  the LLC to accept such offer.  Such offer
shall be  deemed accepted  by the  LLC if  the Non-Offering  Party  delivers  a
written acceptance  notice to  the Offering  Party within  such  30-day  period
(which shall  be deemed  to be the written consent contemplated by Section 1.6,
1.12, 1.16  or 1.33  hereof, as  the case  may be).   Upon the delivery of such
acceptance notice,  (i) any  Patents or  Technical Information  subject to  the
offer shall thereupon be deemed to be Licensed Progenics Patents (under Section
1.16 hereof),  Progenics Technical  Information (under  Section  1.33  hereof),
Licensed CYTOGEN  Patents (under  Section 1.12  hereof)  or  CYTOGEN  Technical
Information (under  Section 1.6  hereof), as  the case  may be,  and  (ii)  the
Offering Party  shall be deemed to have made the representations and warranties
referred to  in Sections  3.3(a) and  3.3(b) hereof,  subject to the exceptions
identified by the Offering Party as described in such sections.

               3.4.      Sublicenses.   The LLC  shall have  the right to grant
sublicenses of  the rights  granted hereunder,  provided that:   (i)  each such
sublicensee agrees  in writing  to keep  books and records and permit Progenics
and CYTOGEN  to  review  such  books  and  records  pursuant  to  the  relevant
provisions, and to comply with all terms of this Agreement expressly applicable
to a  sublicensee of  the LLC;  and (ii)  within 15  days of  granting any such
sublicense the  LLC shall  give written  notice of  such grant to Progenics and
CYTOGEN and  provide Progenics  and CYTOGEN with a copy of such sublicense.  No
consent or  approval of  Progenics or  CYTOGEN shall  be required in connection
with the granting of such sublicenses.

               3.5.      Guarantee of  Performance of  Sublicensee.    The  LLC
hereby unconditionally  guarantees to  Progenics and CYTOGEN the performance of
any of  its sublicensees' financial obligations hereunder, including making all
payments due,  and making all reports required, under this Agreement to be made
by reason  of  sales  of  Licensed  Products  by  its  sublicensees  and  their
compliance  with  all  applicable  terms  of  this  Agreement.    In  any  such
sublicense, the  sublicensee shall  agree that  in the event of a breach by the
sublicensee in  the observance  of any  applicable  terms  of  this  Agreement,
Progenics and/or  CYTOGEN, as  applicable, shall  be entitled to proceed either
against such  sublicensee or  directly against  the LLC,  as  Progenics  and/or
CYTOGEN, as  applicable, may  determine in their respective sole discretion, to
enforce this Agreement.

               3.6.      Cure of  Breach by  Sublicensee.  Upon notification to
Progenics and  CYTOGEN by  the LLC  of the  grant by  the LLC of any sublicense
under this Agreement, Progenics and CYTOGEN shall become obligated to notify in
writing any  such sublicensee  of any  breach by  the LLC  hereunder, or of any
purported termination  by CYTOGEN  or Progenics, with such notice to be sent to
such sublicensee  (at the  address specified  by the  LLC) at  the same time as
notice is  sent to the LLC.  In the event that the LLC breaches this Agreement,
which breach  remains uncured  through the  expiration of  any applicable  cure
period, any  sublicensee of the LLC hereunder shall have the right, but not the
obligation, during  a period  of 45  days after the expiration of the aforesaid
cure period, to cure such breach in its own name, and, upon curing such breach,
such sublicensee shall have the right to be substituted for the LLC as a direct
sublicensee under  the Licenses  to the exclusion of, and on the same terms as,
the LLC  to the  extent of  the sublicense.   A  provision to the effect of the
foregoing shall be included in any sublicense granted hereunder.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      9

<PAGE>
               3.7       [*  *  *]

               3.8       [*  *  *]

               3.9.      Reservation of  Rights.   Progenics reserves the right
to practice  and use  the Progenics Technical Information and to develop, make,
have made  and use  Licensed Progenics Products, and CYTOGEN reserves the right
to practice  and use  the CYTOGEN  Technical Information  and to develop, make,
have made  and use  Licensed CYTOGEN  Products, in  each case  without cost and
subject to the confidentiality provisions of this Agreement, for non-commercial
internal research and development purposes.

               3.10.     No Other Rights.  Except as expressly provided herein,
no right,  title or  interest is  granted (i)  by Progenics  under the Licensed
Progenics Patents,  the Progenics Technical Information or otherwise or (ii) by
CYTOGEN under  the Licensed  CYTOGEN Patents, the CYTOGEN Technical Information
or otherwise.   Progenics  and CYTOGEN  expressly do  not  grant,  and  nothing
contained herein  is intended  to grant, or shall be construed as granting, any
right, title or interest outside of the Field.

               3.11.     Competition Not  Prohibited.  No license granted under
this Agreement,  and no  other provision  contained herein,  shall be deemed to
prohibit Progenics  or CYTOGEN  from engaging  in any  activity outside  of the
Field, whether  or not  such activity  is competitive  with the  development or
commercialization of any Licensed Product or any other activity of the LLC.

          4.   CERTAIN COVENANTS.

               4.1.      Diligence.   The LLC  shall use  reasonable commercial
efforts consistent with its sound business judgment to promptly develop, obtain
regulatory approval  for, manufacture,  market and  sell Licensed Products.  In
the event  that Progenics  and/or CYTOGEN, from time to time during the term of
this Agreement, determines, in the exercise of its or their reasonable business
judgment after  discussion with  the LLC,  that the LLC is not using reasonable
commercial efforts  to develop,  obtain regulatory  approval for,  manufacture,
market and  sell a  Licensed Product  within the United States and at least one
other Major  Market, then  Progenics and/or  CYTOGEN, as the case may be, shall
have the  right to request that the LLC immediately undertake such efforts.  In
the event that any such request is made by Progenics and/or CYTOGEN to the LLC,
and the  LLC, within 90 days of such request, does not provide Progenics and/or
CYTOGEN, as  the case  may be,  with satisfactory  evidence  that  the  LLC  is
undertaking such  efforts, Progenics  and/or CYTOGEN, as the case may be, shall
have the  right to  terminate the  license granted  by such  party to  the  LLC
hereunder.    In  the  event  that  the  LLC  does  not  agree  with  any  such
determination by Progenics or CYTOGEN, the LLC and Progenics and/or CYTOGEN, as
the case  may be,  shall resolve  such matter  in accordance with Section 14.11
hereof. For  purposes of the foregoing, the efforts of the LLC's Affiliates and
sublicensees, and  of distributors,  clinical research  organizations and other
third parties  acting on  behalf of  the LLC,  its Affiliates  or sublicensees,
shall be  deemed to  be the efforts of the LLC.  Notwithstanding the provisions
of this  Section 4.1  neither  Progenics  nor  CYTOGEN  shall  be  entitled  to
terminate, pursuant  to this Section 4.1, the licenses granted hereunder if the
LLC's failure  to use  reasonable best  efforts  to  promptly  develop,  obtain
regulatory approval for, manufacture, market and sell Licensed Products results
from such  party's actions  or omissions  in its capacity as an owner of equity
interest of  the  LLC  or  from  the  actions  or  omissions  of  such  party's
representatives in their capacity as managers of the LLC.

               4.2.      No Waivers  or Grant of Further Rights.  Neither party
hereto will,  without the  prior written  consent of  the other parties hereto,
terminate, amend,  modify or  grant any  waivers or  consents under  any  Prime
License with  respect to  the Field,  or grant  any further rights in the Field
except to  the LLC,  or take  any other  action with  respect to  the  Licensed
Patents or  the Licensed  Technical Information that could adversely affect the
rights granted to the LLC hereunder.

               4.3.      Summary Reports.  For so long as the LLC is developing
Licensed Products,  the LLC  shall keep  Progenics and CYTOGEN informed through
written summary  reports about  the  status  of  the  development  of  Licensed
Products.  Such reports shall be provided to Progenics and CYTOGEN on an annual
basis, with  the first  report due  on the  first anniversary  of the Effective
Date.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      10

<PAGE>
               4.4.      Breach of  SKICR Agreement.  In the event that CYTOGEN
shall be in breach of or default under any of the material terms, conditions or
agreements contained in the SKICR Agreement or the Wright Agreement to be kept,
observed or  performed by it, or receives notice of breach or termination of or
default under such agreements, it shall immediately notify the LLC thereof.  If
CYTOGEN has  not cured  such breach  or default  within [*   *   *]  after  the
effective date  of any notice of termination issued with respect to such breach
or default,  the LLC  shall have the right, but not the obligation, to cure any
such breach  or default in its own name, and the LLC shall have the right to be
substituted for  CYTOGEN as  direct licensee  in the  Field under  either  such
agreement to  the exclusion  of, and on the same terms as, CYTOGEN.  If the LLC
elects not  to cure  such breach  or default  or fails  to cure  such breach or
default within  [*   *   *] of the notice, then Progenics shall have the right,
but not  the obligation, to cure any such breach or default in its own name, [*
*  *].

               4.5.      Acquiring Other  Rights in  the Field.   Progenics and
CYTOGEN agree  that they  will not,  without the  prior written  consent of the
other, acquire  by license  or otherwise  intellectual property  rights in  the
Field unless such rights include the right to grant a sublicense of such rights
to the LLC.

               4.6.      Notices under  Prime Licenses.   Each of Progenics and
CYTOGEN shall  require each  licensor of  any Prime  License to  which it is or
becomes a  party to  furnish copies  of all  notices and  other  communications
required or  permitted under  such Prime  License (including without limitation
notices of  breach or termination) to the LLC and, upon the request of the LLC,
to such  sublicensee(s) of the LLC as the LLC shall specify.  In addition, each
of Progenics  and CYTOGEN will furnish copies of all notices and communications
to the LLC and, upon the request of the LLC, to such sublicensees of the LLC as
the LLC shall specify.

               4.7.      Compliance with  Terms of  Prime Licenses; Assignment.
Each of  Progenics and  CYTOGEN shall fulfill each of its obligations under any
Prime License  to which  it is a party.  Without limiting the generality of the
foregoing, within  30 days  of the  execution of  this Agreement  CYTOGEN shall
notify SKICR  of the  execution of  this Agreement  and provide  SKICR with the
LLC's name  and address as required by Section III.D.3. of the SKICR Agreement.
Neither Progenics  nor CYTOGEN  will assign any interests under a Prime License
unless the  assignee expressly  agrees to  take such  interest subject  to  the
interest of the LLC hereunder.

               4.8       [*  *  *]

          5.   ROYALTIES AND  OTHER PAYMENTS.  In further consideration for the
exclusive licenses  granted by Progenics and CYTOGEN to the LLC pursuant to the
provisions of Sections 3.1 and 3.2 hereof, the LLC agrees to make the following
payments to Progenics and CYTOGEN as follows:

               5.1.      Amounts Payable with Respect to the Progenics License.
The LLC  shall pay  earned royalties  to Progenics  with respect to any sale of
Licensed Progenics  Products.  Such royalties shall be paid at cost -- i.e., at
the minimum  royalty rate(s) required to be paid by Progenics, and at the times
any such  payments are due, under any Prime License.  In addition, the LLC will
pay to  Progenics fees  equal in  amount to  the minimum amount of any license,
milestone, minimum  royalty or  other fees  required to be paid by Progenics to
any third party under any Prime License at the times any such payments are due.
Any license,  milestone, minimum  royalty or  other fees  (but excluding earned
royalties) payable  by the  LLC to  Progenics pursuant  to this  Section 5.1 in
respect of a Prime License shall be discounted if Progenics has not sublicensed
to the  LLC all  of the  intellectual property  rights acquired by Progenics in
such Prime License.  Such discount shall be equal to the proportionate economic
value, as  agreed upon  in good  faith by  the parties  hereto at the time such
rights are sublicensed to the LLC, of the rights not so sublicensed relative to
the totality of rights licensed to Progenics in the Prime License.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      11

<PAGE>
               5.2.      Amounts Payable  with Respect  to the CYTOGEN License.
The LLC  shall pay  earned royalties  to CYTOGEN  with respect  to any  sale of
Licensed CYTOGEN  Products.   Such royalties  shall be paid at cost -- i.e., at
the minimum  royalty rate(s)  required to  be paid by CYTOGEN, and at the times
any such  payments are due, under any Prime License.  In addition, the LLC will
pay to  CYTOGEN fees  equal in  amount to  the minimum  amount of  any license,
milestone, minimum  royalty or other fees required to be paid by CYTOGEN to any
third party  under any  Prime License  at the  times any such payments are due.
Any license,  milestone, minimum  royalty or  other fees  (but excluding earned
royalties) payable  by the  LLC to  CYTOGEN pursuant  to this  Section  5.2  in
respect of  a Prime  License shall be discounted if CYTOGEN has not sublicensed
to the  LLC all of the intellectual property rights acquired by CYTOGEN in such
Prime License.   Such  discount shall  be equal  to the  proportionate economic
value, as  agreed upon  in good  faith by  the parties  hereto at the time such
rights are sublicensed to the LLC, of the rights not so sublicensed relative to
the totality  of  rights  licensed  to  CYTOGEN  in  the  Prime  License.    In
particular, the  license, milestone,  minimum royalty  or other fees payable by
the LLC  to CYTOGEN pursuant to this Section 5.2 with respect to amounts due by
CYTOGEN to  SKICR pursuant  to the SKICR Agreement shall be discounted by [*  *
*] to  reflect the  value of  rights sublicensed  by SKICR  to CYTOGEN  but not
sublicensed by CYTOGEN to the LLC.

               5.3.      Allocation of  Royalties.   If (i)  any Prime  License
requires the  payment of royalties at a rate which varies with sales volume and
(ii) CYTOGEN  or Progenics  (as the  case may  be as  to any  particular  Prime
License) has sublicensed rights under such Prime License to one or more persons
("Other Licensees")  in addition  to the LLC, then the royalty rates applicable
to the  sale of Licensed Products for purposes of determining royalties payable
with respect  to such  Prime License shall be calculated by making an equitable
allocation (on  a notional  basis) of  net sales  by  the  LLC  and  the  Other
Licensees as to each royalty rate/sales level.

          6.   PATENT PROSECUTION AND MAINTENANCE, ETC.

               6.1.      Prosecution and  Maintenance.   To the  fullest extent
legally or  contractually entitled, each of Progenics and CYTOGEN hereby grants
to the  LLC the  exclusive right  to prepare,  file  or  prosecute  any  patent
application licensed  to the  LLC by such party, maintain or extend the term of
any issued  Patent licensed  to the  LLC by  such party  and defend against any
conflicts, oppositions  or interferences  involving third-party  challenges  to
Patents licensed  to the  LLC by such party.  The cost of such activities shall
be borne  by the LLC; provided, however, that if less than all of the rights to
any such  Patent has  been licensed  to the  LLC pursuant hereto, the LLC shall
bear only  that portion  of  the  cost  of  such  activities  as  reflects  the
proportionate economic  value, as  agreed upon  in good  faith by  the  parties
hereto, of  the rights  licensed to  the LLC.    Progenics  and  CYTOGEN  shall
cooperate, at the LLC's expense, with all reasonable requests of the LLC in all
such activities.   If  at any  time the  LLC determines not to prepare, file or
prosecute patent applications licensed to the LLC hereunder, maintain or extend
the term  of any  issued Patent licensed to the LLC hereunder or defend against
any conflicts, oppositions or interferences involving third-party challenges to
any Patent  licensed to the LLC hereunder, the LLC shall notify CYTOGEN (in the
case of  Licensed CYTOGEN  Patents) or  Progenics  (in  the  case  of  Licensed
Progenics Patents)  of any  such determination  and grant  back to  CYTOGEN  or
Progenics, as  the case may be, the right to conduct any such activity.  If the
right to  prepare, file  or prosecute  any patent  application licensed  to the
Company hereunder,  or to  maintain or  extend or  to defend against any third-
party conflicts,  oppositions or interferences involving any Patent licensed to
the LLC hereunder cannot be granted to the LLC, the party licensing such Patent
shall use commercially reasonable efforts diligently to perform, or cause to be
performed, in  consultation with  the LLC,  such activities.   The cost of such
activities shall  be borne by the LLC; provided, however, that if less than all
of the  rights to any such Patent has been licensed to the LLC pursuant hereto,
the LLC shall bear only that portion of the cost of such activities as reflects
the proportionate  economic value,  as agreed upon in good faith by the parties
hereto, of the rights licensed to the LLC.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

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               6.2.      Disclosure Regarding  Patent Activities.   Each  party
which engages  in patent  activities of  the nature  described in  section  6.1
hereof shall  promptly provide the other parties hereto with all correspondence
(including any  filings sent  or received) and all other information concerning
such  activities   which  comes   into  such   party's  possession,  and  shall
periodically update  the other  parties  hereto  on  all  relevant  information
concerning the  actions described  in Section  6.1 hereof.   In addition to the
foregoing, each party required to disclose information pursuant to this Section
6.2 shall  provide to  the other  parties hereto  a reasonable  opportunity  to
review any  materials to  be submitted or filed with any patent or governmental
authority or  in connection  with any  such proceeding  and to  comment on such
materials and  will discuss  and consider  such comments  in good  faith.   The
parties hereto  consent to the disclosure of such correspondence by the LLC, at
its discretion,  to any and all of its Affiliates and any sublicensee, provided
that such Affiliates and sublicensees shall receive such correspondence under a
confidential disclosure agreement reasonably satisfactory in form and substance
to Progenics or CYTOGEN, as the case may be.

          7.   REPORTS AND ROYALTY PAYMENTS; BOOKS AND RECORDS.

               7.1.      Reports.   On or before the last day of each February,
May, August,  and November  commencing  with  the  first  Commercial  Sale  and
thereafter throughout  the Contract Period, the LLC shall furnish Progenics and
CYTOGEN with  a written report, signed by an authorized officer or agent of the
LLC, showing  all Commercial  Sales with  respect to which earned royalties are
due Progenics  and/or CYTOGEN  hereunder with  respect to  the  quarters  ended
December 31, March 31, June 30 and September 30, respectively.

               7.2.      Royalty Payments.   With  each such  quarterly report,
the LLC  shall remit  to Progenics  and/or CYTOGEN  the total  amount of earned
royalties shown  thereby to be due.  All payments shall be made in lawful funds
of the United States of America.

               7.3.      Calculation of Royalties and Other Payments.  In order
to permit  the LLC  to calculate  the amount  of royalties  and other  payments
payable pursuant  to Section  5 hereof,  Progenics and CYTOGEN shall provide to
the LLC  true and  complete copies of all Prime Licenses. Progenics and CYTOGEN
will also  furnish the  LLC with  a written  report, signed  by  an  authorized
officer, stating product sales by each  of the other licensees (if any) covered
by such  Prime License (to the extent available to, and not subject to legal or
contractual restrictions  on disclosure  by, Progenics  or CYTOGEN, as the case
may be), and will make their respective personnel available to answer questions
and otherwise  provide information  with  respect  to  any  matters  reasonably
necessary for  the LLC  to calculate  amounts due  by the  LLC to  Progenics or
CYTOGEN under Section 5 hereof.

               7.4.      Currency Control  Restrictions.  In the event that the
LLC is  precluded from  transferring royalties  due  Progenics  and/or  CYTOGEN
hereunder at  any time  during the  Contract Period  because the LLC has failed
after  due  diligence  to  obtain  the  approval  of  such  transfer  from  the
appropriate governmental  agency responsible  for control of currency exchanges
of a  particular country  in which the LLC has sold Licensed Products, then the
LLC agrees  (a) to  deposit or  to cause  the deposit  of such royalties to the
account of Progenics or CYTOGEN, as the case may be,  in a bank in such country
designated by the beneficiary of such deposit; (b) to provide or to cause to be
provided to  such beneficiary documentary evidence of such deposits; and (c) to
remit or  to cause  remittance of such deposits to such beneficiary immediately
upon the subsequent approval of such transfers by such governmental agency. The
LLC further  agrees that  the form of such depository account shall permit such
beneficiary to withdraw the deposited amounts at will, but shall permit the LLC
to withdraw  the deposited  amounts solely  for the  purpose of  remitting such
amounts to such beneficiary pursuant to the provisions of this Paragraph 7.4.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

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               7.5.      Books and  Records.   The LLC  agrees to keep adequate
and complete  records showing  all Commercial  Sales and/or other revenues with
respect to  which earned  royalties and/or  other payments  are  due  Progenics
and/or CYTOGEN  hereunder. Such records shall include all information necessary
to verify  the total  amount and  computation of  earned royalties and/or other
payments hereunder,  and shall  be open  to inspection by Progenics and CYTOGEN
during reasonable  business hours  to the extent necessary to verify the amount
thereof.   Such inspection  by each  of Progenics and CYTOGEN shall be made not
more often  than once  each calendar  year at  the request  of Progenics and/or
CYTOGEN (unless  good cause  is shown  by Progenics  or CYTOGEN of the need for
more frequent  inspection) by  an auditor appointed by the requesting party and
to whom  the LLC  has no reasonable objection, provided that such auditor shall
be  under  a  confidentiality  obligation  to  the  LLC  to  reveal  only  that
information, and  only  to  the  requesting  party,  necessary  to  verify  the
royalties due  hereunder.   In addition,  such inspection shall be limited to a
period not  to extend  beyond three  years after  the date  of receipt  by  the
requesting party  of a report from the LLC relating to such records pursuant to
Section 7.1  hereof.   After such  three-year period,  any such  report and the
records upon which such report was based shall be deemed presumptively correct.
The expenses of any such audit shall be borne by the party requesting the audit
unless the  audit determines  a discrepancy in favor of the requesting party of
at least  [*   *   *], in  which event the audit expenses shall be borne by the
LLC.   Notwithstanding the  foregoing, either  Progenics or  CYTOGEN shall,  at
reasonable times  and upon  reasonable notice,  be granted  access  after  such
three-year period  to such  records (to  the extent  retained by  the LLC)  for
purposes of preparing tax returns and related materials.

          8.   TAXATION OF PAYMENTS.  Insofar as any earned royalties which are
due Progenics or CYTOGEN hereunder are subject to taxation by any country under
the provisions  of the  tax laws  of that  country, then the LLC agrees to bear
such taxes, and Progenics and CYTOGEN hereby authorize the LLC to withhold such
taxes from  the  payments  which  are  payable  to  Progenics  and  CYTOGEN  in
accordance with  this Agreement  if the  LLC is  either required to do so under
such country's  tax laws  or directed  to do  so by an agency of such country's
government. Whenever  the LLC  deducts such tax from any payments due Progenics
or CYTOGEN,  the LLC  shall furnish  Progenics or  CYTOGEN, as the case may be,
with a  tax certificate  showing the  payment of  such tax to the government of
such country.   In  the event such taxes are assessed against the LLC by reason
of its failure to withhold such taxes from any payments which have been paid to
Progenics or  CYTOGEN in  accordance with  this Agreement,  then  Progenics  or
CYTOGEN, as  the case  may be,  agrees  to  reimburse  the  LLC  for  such  tax
assessment but  not for any fine, penalty, fee or interest related to the LLC's
failure to withhold, pay or make timely payment of such taxes.

          9.   PRODUCT LIABILITY DISCLAIMERS.

               9.1.      Product Liability  Disclaimer by Progenics.  Progenics
assumes no  responsibility for the manufacture, product specifications, end use
or provision  of any  Licensed Products that are manufactured or provided by or
for, or  sold by,  the LLC  or any  Affiliate or  third-party  licensee.    All
warranties in  connection with  such Licensed  Products made or provided by the
LLC or  any Affiliate  or third-party  licensee shall not directly or impliedly
obligate Progenics in any manner whatsoever under such warranties or otherwise.

               9.2.      Product Liability  Disclaimer  by  CYTOGEN.    CYTOGEN
assumes no  responsibility for the manufacture, product specifications, end-use
or provision  of any  Licensed Products that are manufactured or provided by or
for, or  sold by,  the LLC  or any  Affiliate or  third-party  licensee.    All
warranties in  connection with  such Licensed  Products made or provided by the
LLC or  any Affiliate  or third-party  licensee shall not directly or impliedly
obligate CYTOGEN in any manner whatsoever under such warranties or otherwise.

               9.3.      Product Liability  Disclaimer by  the LLC.    The  LLC
assumes no  responsibility for the manufacture or product specifications of any
products which  are manufactured  by or for Progenics or CYTOGEN except for the
manufacture or  product specifications of materials made by or for the LLC. Any
warranties in  connection with  such products  made by  Progenics or CYTOGEN as
user of such products shall not directly or impliedly obligate the LLC.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

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          10.  INDEMNIFICATION AND INFRINGEMENT.

               10.1.     Indemnification.

               10.1.1.   By Progenics.   Progenics  shall indemnify, defend and
hold CYTOGEN  and the  LLC, their  respective Affiliates and any sublicensee of
the LLC  hereunder harmless  from and  against any  and all  claims,  suits  or
demands for  liability, damages,  losses, costs  and  expenses,  including  the
reasonable costs  and expenses of counsel (collectively, "Losses"), arising out
of (i)  any breach  of the  representations and  warranties, or  the failure to
perform when  and as  required any  of the  covenants or  agreements,  made  by
Progenics in  this Agreement or (ii) any infringement or purported infringement
of  third-party   intellectual  property  rights  by  practicing  the  Licensed
Progenics Patents or the Progenics Technical Information.

               10.1.2.   By CYTOGEN.   CYTOGEN shall indemnify, defend and hold
Progenics and  the LLC,  their respective Affiliates and any sublicensee of the
LLC hereunder  harmless from  and against any and all Losses arising out of (i)
any breach  of the  representations and  warranties, or  the failure to perform
when and  as required  any of  the covenants  or agreements, made by CYTOGEN in
this Agreement  or (ii)  any infringement  or purported  infringement of third-
party intellectual  property rights  by practicing the Licensed CYTOGEN Patents
or the CYTOGEN Technical Information.

               10.1.3.   By the  LLC.  The LLC shall indemnify, defend and hold
Progenics and  CYTOGEN their  respective Affiliates  and any sublicensee of the
LLC hereunder  harmless from  and against any and all Losses arising out of (i)
any breach  of the  representations and  warranties, or  the failure to perform
when and  as required  any of  the covenants  or agreements, made by the LLC in
this Agreement  or (ii)  any claim  by a  third party that any Licensed Product
made, used  or sold  by or  on behalf  of the  LLC or  any  sublicense  thereof
infringes patent  rights of  such third party (except insofar as any such claim
gives rise  to an  indemnification obligation of Progenics under Section 10.1.1
hereof or of CYTOGEN under Section 10.1.2 hereof.

               10.2.     Third Party  Infringement of  Licensed Patent  Rights.
The following  provisions relate  to third-party  infringement of  any  of  the
Licensed Patents:

               10.2.1.   Infringement of  Licensed Progenics  Patents.   In the
event that  any party  hereto becomes  aware that any third party is infringing
any claims  of any issued patent included within the Licensed Progenics Patents
sublicensed to  the LLC hereunder, then such party shall immediately advise the
other parties  hereto, and  the parties shall consult with each other as to the
most effective way of proceeding.  Under such circumstances:

               (a)  the  LLC,   as  the  exclusive  licensee  of  the  Licensed
Progenics Patents, shall have the right, but not the obligation, and subject to
any applicable  third-party rights,  to commence  and prosecute an action under
the  appropriate  Licensed  Progenics  Patents  against  any  such  third-party
infringer, in which event the LLC shall bear the costs of such action and shall
be entitled to retain any recovery resulting therefrom;

               (b)  if the  LLC declines  or fails to commence and/or prosecute
such action,  then Progenics  shall be  entitled to  commence and  prosecute an
action under  the appropriate  Licensed Progenics  Patents against  such third-
party infringer,  in which  event Progenics shall bear the costs of such action
and shall be entitled to retain any recovery resulting therefrom.

               The parties  hereto shall cooperate fully with each other in any
such  proceedings,   including  joining   as  a  necessary  party  (subject  to
appropriate indemnification  arrangements),  shall  consult  as  to  litigation
strategies and  other matters related to any such proceedings, and shall, among
other things,  furnish information and evidence when so requested by the other,
including testimony by the requested party, its agents and employees, as may be
required by the party commencing and prosecuting such action.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

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<PAGE>
               10.2.2.   Infringement of  Licensed CYTOGEN  Patents.    In  the
event that  any party  hereto becomes  aware that any third party is infringing
any claim  or claims  of any issued patent included within the Licensed CYTOGEN
Patents sublicensed  to the  LLC hereunder,  then such  party shall immediately
advise the  other parties hereto, and the parties shall consult with each other
as to the most effective way of proceeding.  Under such circumstances:

               (a)  the LLC,  as the exclusive licensee of the Licensed CYTOGEN
Patents, shall  have the  right, but  not the  obligation, and  subject to  any
applicable third-party  rights, to  commence and  prosecute an action under the
appropriate Licensed CYTOGEN Patents against any such third-party infringer, in
which event  the LLC  shall bear the costs of such action and shall be entitled
to retain any recovery resulting therefrom;

               (b)  if the  LLC declines  or fails to commence and/or prosecute
such action, then CYTOGEN shall be entitled to commence and prosecute an action
under  the  appropriate  Licensed  CYTOGEN  Patents  against  such  third-party
infringer, in which event CYTOGEN shall bear the costs of such action and shall
be entitled to retain any recovery resulting therefrom.

               The parties  hereto shall cooperate fully with each other in any
such proceedings,  consulting as  to litigation  strategies and  other  matters
related to  any such  proceedings,  and  shall,  among  other  things,  furnish
information and evidence when so requested by the other, including testimony by
the requested  party, its agents and employees, as may be required by the party
commencing and prosecuting such action.

          11.  TERM AND TERMINATION.

               11.1.     Term.   Unless sooner  terminated in  a manner  herein
provided, this  Agreement shall  commence as  of the  Effective Date  and shall
terminate upon  the last  to expire  or terminate  of any  licensable rights to
Patents that  have been  licensed by Progenics or CYTOGEN to the LLC hereunder;
provided, however,  that the  provisions of Sections 7.1, 7.5, 9, 10, 12 and 14
hereof shall survive any such termination.

               11.2.     Termination.   This Agreement may be terminated at any
time prior to the end of the term set forth in Section 11.1 hereof, as follows:

               11.2.1.   For Breach.   In  the event  any  party  hereto  shall
breach any  of the material representations or warranties or any material term,
condition or  agreement contained  herein made  or  to  be  kept,  observed  or
performed by  it, then  any other party hereto may terminate this Agreement, at
its option  and without prejudice to any of its other legal or equitable rights
and remedies,  by giving  the other  parties hereto 60 days' notice in writing,
identifying with  reasonable specificity  the breach,  unless (in the case of a
breach of  any term, condition or agreement) the notified party within such 60-
day period  shall have  cured the  breach.  Notwithstanding the foregoing, if a
party hereto  has given  notice of  the breach of another party hereto, and the
breaching party  has not  cured the  breach within the 60-day  period described
above, the  third party hereto may (but shall not be obligated to), upon notice
given to  the other  non-breaching party hereto prior to the expiration of such
60-day period, elect to cure such breach.  If the third party cures such breach
within 30  days of  the expiration  of the  60-day period described above, such
third party  shall be  substituted for  the breaching party for all purposes of
this Agreement,  and shall thereafter be entitled to all the rights and subject
to all  the obligations  of such  breaching party hereunder.  The breach of the
representation contained  in Section  2.1.7 or 2.2.14 hereof, absent fraud, bad
faith or  willful misrepresentation, shall not give rise to a termination right
under this Section 11.2.1.

               11.2.2.   For Bankruptcy.   (a)  In the event (i) a party hereto
shall suspend  business, or  shall file  a voluntary  petition  or  any  answer
admitting the  jurisdiction of  the court  and the  material allegations of, or
shall consent  to an  involuntary petition  pursuant to  or  purporting  to  be
pursuant to  any reorganization or insolvency law of any jurisdiction, or shall
make an  assignment for the benefit of creditors, or shall apply for or consent
to the  appointment of  a receiver  or trustee  of a  substantial part  of  its
property, and  (ii) no  Affiliate of  such party  shall undertake to assume its
obligations under the provisions of this Agreement within 90 days from the date
on which  such party  becomes so  disabled, then to the extent permitted by law
either of the other parties may thereafter immediately terminate this Agreement
by giving written notice of termination to the other parties.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

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               (b)  In the  event Progenics and/or CYTOGEN, as the case may be,
terminates this  Agreement under  Section 11.2.2(a)  or rejects  this Agreement
pursuant to  Section 365  of the  U.S. Bankruptcy Code, all rights and licenses
granted under or pursuant to this Agreement by Progenics and/or CYTOGEN, as the
case may  be, to the LLC are, and shall otherwise be deemed to be, for purposes
of  Section  365(n)  of  the  U.S.  Bankruptcy  Code,  licenses  of  rights  to
"intellectual property" as defined under Section 101(52) of the U.S. Bankruptcy
Code.   The parties agree that the LLC, as a licensee of such rights under this
Agreement, shall  retain and may fully exercise all of its rights and elections
under the  U.S. Bankruptcy  Code.  The parties further agree that, in the event
of the  commencement of  a bankruptcy  proceeding by  or against  Progenics  or
CYTOGEN under the U.S. Bankruptcy Code, the LLC shall be entitled to a complete
duplicate of  (or complete  access to,  as appropriate)  any such  intellectual
property and all embodiments of such intellectual property upon written request
therefor by  the LLC.   Such  intellectual property and all embodiments thereof
shall be  promptly delivered  to the  LLC (i)  upon any  such commencement of a
bankruptcy  proceeding  upon  written  request  therefor  by  the  LLC,  unless
Progenics or  CYTOGEN, as the case may be, elects to continue to perform all of
its obligations  under this Agreement or (ii) if not delivered under (i) above,
upon the  rejection of  this Agreement by or on behalf of Progenics or CYTOGEN,
as the  case may  be, upon  written request  therefor by the LLC.  Progenics or
CYTOGEN, as  the case may be, shall not interfere with the rights of the LLC as
provided in  this Agreement,  or any  agreement supplementary  hereto, to  such
intellectual property  (including all  such embodiments thereof), including any
right of the LLC to obtain such intellectual property (or such embodiment) from
any other entity.

               11.2.3.   By Progenics  or the LLC Upon Termination of the SKICR
License.   Either Progenics  or the  LLC may terminate this Agreement by giving
the other  parties hereto  30 days'  written notice upon the termination of the
SKICR License; provided that, without limiting the other rights and remedies of
the parties  hereto, each  of Progenics  and CYTOGEN  may seek  an  appropriate
remedy against the other if the other is responsible for the termination of the
SKICR License.

               11.3.     Accrued Rights  and Obligations.   Termination of this
Agreement shall not relieve any party of any rights or obligations then accrued
hereunder or  which by  the  terms  hereof  extend  beyond  the  date  of  such
termination.

          12.  EFFECT OF  TERMINATION ON SUBLICENSEE.  Upon termination of this
Agreement by  Progenics or CYTOGEN pursuant to Section 11.2.1 or Section 11.2.2
hereof, any  third-party licensee  of the  LLC which  has not  breached in  any
material respect its sublicense related to the Licensed Patents or the Licensed
Technical Information  shall be  entitled to  receive a license to the Licensed
Patents and  the Licensed  Technical Information  directly from  Progenics  and
CYTOGEN granting  rights substantially  the  same  as  those  granted  in  such
sublicense and  containing obligations as a licensee similar to those set forth
in this Agreement.

          13.  EXPORT LICENSES.   This Agreement is subject to any restrictions
concerning the  export of  products or  technical information  from the  United
States which  may be  imposed by  the United  States. Accordingly,  each  party
agrees  that  it  will  not  export,  directly  or  indirectly,  any  technical
information acquired  under this  Agreement or  any products utilizing any such
technical information  to any country for which the United States Government or
any agency  thereof at  the time  of export requires an export license or other
governmental approval,  without first  obtaining the  written consent  to do so
from the Department of Commerce or other agency of the United States Government
when required by an applicable statute or regulation.

          14.  MISCELLANEOUS PROVISIONS.

               14.1.     Assignability.   Except as  expressly provided herein,
neither this  Agreement nor  any interest  hereunder shall be assignable by any
party hereto  without the  written consent  of the  others, and  any  attempted
assignment without  such consents  shall be null and void.  Without the consent
of any  other party  hereto, this Agreement may be assigned by any party hereto
to any  wholly owned  subsidiary of such party that agrees in writing with each
other party  hereto to be jointly and severally liable with the assigning party
for  the  timely  satisfaction  of  all  obligations  of  the  assigning  party
hereunder; provided,  however,  that  no  such  assignment  shall  relieve  the
assigning party  of its obligations hereunder.  This Agreement shall be binding
upon the successors and permitted assignees of the parties.  Any such successor
or permitted  assignee shall  be subject  to the same rights and obligations as
the original party hereunder.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

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               14.2.     Notices.     All  notices   and  other  communications
provided for  hereunder shall be in writing and shall be mailed or delivered to
the business address of the respective parties aforementioned, or to such other
address or  addresses as either party shall designate in writing to the others.
All such notices and communications shall be considered given and/or delivered:
(i) when  given if delivered in person or sent by facsimile and acknowledged by
a responsible  person at  the office of the recipient; (ii) one day after being
sent by  a major  overnight courier;  or (iii)  four days after being mailed by
registered mail,  return receipt  requested, at  the business  address  of  the
respective parties  as specified above.  All notices or communications required
or permitted  to be  given or  sent to  the LLC  shall also be given or sent to
Progenics (if  such notice or communication is  given or sent by CYTOGEN) or to
CYTOGEN (if such notice or communication is given or sent by Progenics).

               14.3.     Independent Contractors.   No  agency, partnership  or
joint venture  is hereby  established.   None of  Progenics, CYTOGEN or the LLC
shall enter  into, or  incur, or  hold itself  out to  third parties  as having
authority to  enter into  or incur on behalf of the other party any contractual
obligations, expenses  or liabilities  whatsoever, except as expressly provided
herein.

               14.4.     Counterparts.     This  Agreement   may  be   executed
simultaneously in multiple counterparts, each of which shall be deemed to be an
original but all of which together shall constitute one and the same agreement.

               14.5.     Entire Understanding.   This Agreement constitutes the
entire understanding  between the  parties hereto  with respect  to the subject
matter hereof.   No  modifications, extensions,  or waiver  of  any  provisions
hereof or any release of any right hereunder shall be valid, unless the same is
in writing,  contains reference  to this  Agreement and  sets forth the plan or
intention to modify same, and is consented to by all parties hereto.

               14.6.     Headings.  The headings in this Agreement are intended
solely for  convenience of  reference and  shall be  given  no  effect  in  the
construction or interpretation of this Agreement.

               14.7.     No Implied  Rights.   Except as expressly provided for
in this  Agreement, nothing  contained herein  shall be construed as conferring
any license  or other  rights, by  implication or  estoppel, under  any  patent
(including design  patent and  utility model  patent) or patent application, or
any copyrights, trademarks, trade names or trade dress.

               14.8.     No Waiver.   The  failure of  any party  hereto at any
time or times to require performance of any provision hereof shall in no manner
affect the  right of such party at a later time to enforce the same.  No waiver
by any  party hereto of any condition, or of the breach of any provision, term,
covenant, representation  or warranty  contained in  this Agreement, whether by
conduct or  otherwise, in  any one  or more instances, shall be deemed to be or
construed as  a further  or continuing  waiver of  any such condition or of the
breach of  any other  provision, term,  covenant, representation or warranty of
this Agreement.

               14.9.     Publicity.   In the  absence of prior written approval
of the  other parties  hereto, no  party hereto  shall originate any publicity,
news release,  or other  public announcement,  written or  oral, whether to the
public press,  to stockholders or otherwise, relating to this Agreement, to any
amendment hereto  or activities hereunder, unless such announcement is required
by law  to be made. The party making any such announcement shall give the other
parties an opportunity to review the announcement before it is made.

               14.10.    Promotion and  Advertising.  Nothing contained in this
Agreement shall be construed as conferring on any party hereto any right to use
in advertising,  publicity or other promotional activities any name, tradename,
trademark, service  mark  or  other  designation  (including  any  contraction,
abbreviation or  simulation of any of the foregoing of any other party hereto);
and, each  party hereto agrees not to use any designation of any other party in
any promotional  activity associated  with  this  Agreement,  or  with  product
licensed thereunder, without the express written approval of such other party.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

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               14.11.    Arbitration.   Any dispute  arising out of or relating
to any  provisions of this Agreement shall be finally settled by arbitration to
be held  in New  York, New  York, under the auspices and the current commercial
arbitration rules  of the  American Arbitration Association.  Arbitration shall
be initiated  by delivery  of a  notice (an  "Arbitration Notice") by any party
hereto to the other parties hereto.  Such arbitration shall be conducted by one
arbitrator mutually  selected and  approved by  the parties to the dispute.  If
within 20  calendar days after receipt of the Arbitration Notice the parties to
the dispute  have not  agreed on a mutually acceptable arbitrator, the American
Arbitration Association  in New York,  New York shall be retained to appoint an
arbitrator within 30 calendar days after the receipt of the Arbitration Notice.
The arbitrator's  authority shall  be  limited  to  determining  the  issue  or
question presented in each instance and shall not extend to any other aspect of
this Agreement or the parties' relationship generally.  Judgment upon any award
rendered may be entered in any court having jurisdiction, or application may be
made to  such court  for a  judicial acceptance  of the  award and  an order of
enforcement, as the case may be.

               14.12.    Confidentiality.

               14.12.1.  As  used   in  this   Section   14.12,   "Confidential
Information"  means   confidential  and   proprietary  business,  technical  or
financial  information  relating  to  the  collaboration  contemplated  hereby,
including the  Licensed Technical  Information, of  any other party hereto (the
"Confidential Information").

               14.12.2.  In order  to protect  the Confidential  Information of
any party  hereto (in  such capacity,  the "Disclosing  Party") that has become
available to  any other party hereto (in such capacity, the "Receiving Party"),
each party hereto agrees as follows:

               (a)  Each party  hereto agrees  that it  will make no use of any
Confidential Information  except in furtherance of the purposes contemplated by
this Agreement.

               (b)  Each party  hereto agrees  that it  will not,  without  the
prior written  consent of the other parties hereto, disclose to any third party
Confidential Information  (which for  purposes of this Section 14.12.2(b) shall
include the terms or existence of this Agreement or of the LLC Agreement or the
Services Agreement  or other matters relating to the collaboration contemplated
hereby and  thereby) received  in its  capacity as a Receiving Party during the
Contract Period and for a period of five years thereafter.

               (c)  Notwithstanding the foregoing:

               (i)  Each party  hereto may disclose Confidential Information to
                    those  of   its  representatives,   employees  and   agents
                    ("Representatives")  who   have  a   need  to   know   such
                    Confidential  Information   in  relation   to  the  matters
                    discussed  herein   and  who   are  under   obligations  of
                    confidentiality and non-use consistent with those set forth
                    herein.     Any  unauthorized  disclosure  of  Confidential
                    Information by  a party's Representatives shall be a breach
                    by such party of this Section 14.12.

               (ii) Disclosure of  Confidential Information is permitted to the
                    extent  that   such  disclosure  is  required  pursuant  to
                    applicable  laws,   rules  or   regulations  or  government
                    requirement or  court order,  provided  however,  that  the
                    Receiving Party  shall promptly notify the Disclosing Party
                    in writing  of the  existence or  imposition  of  any  such
                    requirement or  order and  cooperate  with  the  Disclosing
                    Party in  seeking an  appropriate protective order or other
                    reliable assurance  that  confidential  treatment  will  be
                    accorded the Confidential Information.

               14.12.3.  The provisions  governing confidentiality  and non-use
contained in this Section 14.12 shall not apply to any Confidential Information
which:

               (a)  the  Receiving   Party  can  establish  was  known  to  the
Receiving Party  prior to disclosure under or in connection with this Agreement
by the Disclosing Party;

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      19

<PAGE>
               (b)  was in the public domain or the subject of public knowledge
at the time of disclosure under or in connection with this Agreement;

               (c)  becomes part of  the public domain or the subject of public
knowledge through no breach by or act of default of the Receiving Party;

               (d)  is obtained by the Receiving Party from a third party other
than in  breach of a legal or contractual obligation of confidentiality owed by
such third  party to  the Disclosing Party in respect thereof, the existence of
which such  obligation was  known or  should have  been known  by the Receiving
Party; or

               (e)  the  Receiving   Party  can   establish  was  independently
developed by it without reference to Confidential Information received.

               14.12.4.  Termination of  this Agreement  shall not  affect  the
obligations  concerning   confidentiality  and   non-use  of  the  Confidential
Information as set forth in this Section 14.12.

               14.13.    No Third  Party  Beneficiaries.    This  Agreement  is
solely for  the benefit  of the  parties hereto  and should not be construed to
confer  upon   any  other   person  any  remedy,  claim,  liability,  right  of
reimbursement, claim of action or other right.

               14.14.    Governing Law.   This  Agreement shall be interpreted,
construed, and  governed in  accordance with the laws of the State of New York,
without reference to conflict of laws principles.

               14.15.    SKICR Agreement.   Pursuant to Section III.D.4. of the
SKICR Agreement,  the parties  hereto hereby  reference the SKICR Agreement and
all rights  which revert  to SKICR upon termination of the SKICR Agreement.  In
accordance with  Section III.D.8.  of the SKICR Agreement, this Agreement shall
automatically be modified or terminated, in whole or in part, upon any relevant
modification, in  whole or  in part, of the SKICR Agreement.  Such modification
or termination  of this  Agreement shall  be consistent  with and  reflect  the
relevant modifications or terminations of the SKICR Agreement.

               14.16.    Limitation on  Liability.   Notwithstanding any  other
provision  in   this  Agreement,   the  sole  remedy  for  the  breach  of  the
representation contained  in Section  2.1.7 or 2.2.14 hereof, absent fraud, bad
faith or  willful misrepresentation,  is the prompt compliance with Section 3.3
hereof.

               IN WITNESS  WHEREOF, the  parties hereto  have each caused these
presents to be signed by their respective officers thereunto duly authorized.


                                   PROGENICS PHARMACEUTICALS, INC.


                                   By:  /s/  Ronald J. Prentki
                                   -------------------------------
                                     Name:  Ronald J. Prentki
                                     Title:  President


                                   CYTOGEN CORPORATION


                                   By:  /s/ Donald F. Crane
                                   -------------------------------
                                      Name:  Donald F. Crane
                                      Title:  Vice President


                                   PSMA DEVELOPMENT COMPANY LLC


                                   By:  /s/  Ronald J. Prentki
                                   -------------------------------
                                      Name:  Ronald J. Prentki
                                      Title:  Representative
__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      20

<PAGE>

<PAGE>
                                                        ANNEX A
                                                           to
                                                       PSMA/PSMP
                                                   LICENSE AGREEMENT


                  Licensed CYTOGEN Patents as of Date Hereof

                                   [*  *  *]


__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

<PAGE>
                                                        ANNEX B
                                                           to
                                                       PSMA/PSMP
                                                   LICENSE AGREEMENT


                 Licensed Progenics Patents as of Date Hereof

                                   [*  *  *]


__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

<PAGE>
                                                        ANNEX C
                                                           to
                                                       PSMA/PSMP
                                                   LICENSE AGREEMENT


                        Representations and Warranties



     1.   Agreement.   Attached is  a true  and complete  copy of  the [License
Agreement].  No provision of the [License Agreement] has been amended, modified
or waived by [CYTOGEN/Progenics].  To [CYTOGEN/Progenics]'s knowledge:  (i) the
representations  and   warranties  made  by  [the  licensor]  in  the  [License
Agreement] were  true in  all  material  respects  when  made;  (ii) there  has
occurred no act or failure to act that would render such representations untrue
in any  material respect  if made on and as of the date hereof, and (iii) there
exists no  breach or  anticipatory breach  by [the  licensor]  of  any  of  its
material obligations under the [License Agreement].  The [License Agreement] is
in full  force and effect, and [CYTOGEN/Progenics] has complied in all material
respects with  its obligations thereunder.  There does not exist any default by
[CYTOGEN/Progenics] under  the [License  Agreement] that,  after notice  or the
lapse of  time or  both, would  constitute a  material event of default or give
rise to  a right  of termination  thereunder.   [CYTOGEN/Progenics] has neither
given nor  received any  written notice  of termination  or  breach  under  the
[License Agreement].   In  the event  of any  misrepresentation  or  breach  of
warranty by  [the licensor]  under the [License Agreement], [CYTOGEN/Progenics]
will cooperate  with all reasonable requests of the Management Committee of the
LLC regarding  the assertion  of any  claim or  cause of  action  against  [the
licensor] for  such misrepresentation or breach of warranty; provided, that the
LLC shall  bear any  and all  costs, expenses,  liabilities or  obligations  of
[CYTOGEN/Progenics] in connection therewith or arising therefrom.

     2.   No Litigation,  Claims or  Conflicts.   (a) There is no action, suit,
claim or  proceeding pending  or threatened  against [CYTOGEN/Progenics] or, to
[CYTOGEN's/Progenics'] knowledge,  [the licensor]  with respect  to any  of the
rights (including Patent rights) granted to [CYTOGEN/Progenics] pursuant to the
[License  Agreement],  either  at  law  or  in  equity,  before  any  court  or
administrative agency or before any governmental department, commission, board,
bureau, agency  or instrumentality,  whether United States or foreign, relating
to   validity,    infringement,   ownership    or   otherwise,    and   neither
[CYTOGEN/Progenics] nor,  to [CYTOGEN's/Progenics']  knowledge, [the  licensor]
has  received  any  notice  that  any  person  may  bring  such  a  claim,  and
[CYTOGEN/Progenics] has no belief that any basis or grounds exists for any such
actions, suits or claims.

     (b)   To [CYTOGEN/Progenic]'s  knowledge, there  is no  conflict  with  or
violation or  infringement of any rights or asserted rights of any other person
with respect  to the  Patent or  other rights  licensed to  [CYTOGEN/Progenics]
under the [License Agreement]; and

     (c)     There  are   no   proceedings   or   claims   pending   in   which
[CYTOGEN/Progenics] or,  to [CYTOGEN/Progenics]'s  knowledge, any  other person
alleges that  any person is infringing upon, or otherwise violating, any of the
rights licensed  to [CYTOGEN/Progenics]  under the [License Agreement], nor are
any proceedings  threatened by [CYTOGEN/Progenics] or, to [CYTOGEN/Progenics]'s
knowledge, any other person alleging any such violation or infringement.

     3.   Subsisting Rights.   The  [relevant patent  rights, as applicable] in
existence on the date hereof are in full force and effect, have been maintained
to date  and are not invalid or unenforceable, in whole or in part.  No act has
been done or omitted to be done which had or could have the effect of impairing
or dedicating  to the  public, or  entitling any  U.S.  or  foreign  government
authority or  any other person to cancel, forfeit, modify or consider abandoned
any  of   the  rights   licensed  to  [CYTOGEN/Progenics]  under  the  [License
Agreement], or  give any  person any  rights with  respect  thereto.    All  of
[CYTOGEN/Progenics] rights under the [License Agreement] are valid, enforceable
and free of defects.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

<PAGE>
     4.   No  Prior   Transfer.     [CYTOGEN/Progenics]  has   not   previously
sublicensed, assigned, transferred, conveyed or otherwise encumbered its right,
title and interest in any of the rights granted to [CYTOGEN/Progenics] pursuant
to the [License Agreement].

     5.   Exclusive Owner,  etc.  [CYTOGEN/Progenics] is the sole and exclusive
licensee of  the rights  licensed to  [CYTOGEN/Progenics]  under  the  [License
Agreement], all  of which  are  free  and  clear  of  any  liens,  charges  and
encumbrances, and no other person, corporation or other private or governmental
entity or  subdivision thereof  has or  shall  have  any  claims  of  ownership
whatsoever with  respect to  such rights  as so granted to [CYTOGEN/Progenics].
There are  no judgments  or settlements  against or owed by [CYTOGEN/Progenics]
relating to such rights.

     6.   Confidentiality; Effective Waivers.  (a)  Neither [CYTOGEN/Progenics]
nor, to  [CYTOGEN/Progenics] knowledge,  [the licensor] has divulged, furnished
to or  made accessible  to any  person any trade secrets included in the rights
licensed to  [CYTOGEN/Progenics] under  the [License  Agreement] without  prior
thereto having obtained an agreement of confidentiality from such person.

     (b)  [If applicable] The licensor or [CYTOGEN/Progenics] has obtained from
all individuals  who participated in any respect in the invention or authorship
of any rights licensed to [CYTOGEN/Progenics] under the [License Agreement] (as
employees, consultants or otherwise) effective waivers of any and all ownership
rights of  such individuals  in such  rights and assignments to the licensor or
[CYTOGEN/Progenics], as applicable, all rights with respect thereto.

     7.   Patent Prosecution  Disclosure.   [If applicable] [CYTOGEN/Progenics]
has disclosed to the LLC all of the prosecution files of all of the patents and
patent applications proposed to be licensed to the LLC by [CYTOGEN/Progenics].

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      2

<PAGE>
                                                                  Exhibit 10.35


[Confidential treatment has been requested for portions of this Agreement.  The
portions of this Agreement for which confidential treatment have been requested
are omitted from this document; such portions are indicated by asterisks.  The
omitted material has been filed separately with the Securities and Exchange
Commission.]












                      LIMITED LIABILITY COMPANY AGREEMENT

                                      OF

                         PSMA DEVELOPMENT COMPANY LLC





                              Dated June 15, 1999



<PAGE>
                      LIMITED LIABILITY COMPANY AGREEMENT

                                      OF

                         PSMA DEVELOPMENT COMPANY LLC

          This Limited  Liability Company  Agreement (this "Agreement") is made
this 15th  day of  June, 1999,  by and among Progenics Pharmaceuticals, Inc., a
Delaware corporation ("Progenics"), CYTOGEN Corporation, a Delaware corporation
("CYTOGEN"), and  PSMA Development  Company LLC,  a Delaware  limited liability
company (the "Company").

                             EXPLANATORY STATEMENT

          The parties  have agreed to organize and operate the Company pursuant
to the  Delaware Limited  Liability Company  Act (the "Act") in accordance with
the terms and conditions set forth herein.

          NOW, THEREFORE,  for good  and valuable  consideration, the  parties,
intending to be legally bound, agree as follows:

                                   ARTICLE I
                  FORMATION AND NAME:  OFFICE; PURPOSE; TERM

     1.1.      Organization.   The parties  have organized the Company pursuant
to the  Act and  the provisions  of this  Agreement and, for that purpose, have
caused a  Certificate of Formation (the "Certificate"), in the form attached as
Exhibit A, to be executed and filed as required by the Act.

     1.2.      Name of  the Company.   The  name of  the Company  shall be PSMA
Development Company  LLC, and all Company business must be conducted under that
name or  such other  name that  complies with  applicable law as the Management
Committee (as hereinafter defined) may select from time to time.

     1.3.      Principal Place  of Business.   The Company's principal place of
business shall  be c/o  Progenics Pharmaceuticals, Inc., 777 Old Saw Mill River
Road, Tarrytown,  New York  10591  or  any  other  place  of  business  as  the
Management Committee may from time to time deem advisable.

     1.4.      Purpose.  The purposes of the Company are to:

               (i)       acquire,   exploit,   control   and   distribute   all
licensing/sublicensing rights  regarding products in the Field, as such term is
defined in  Section 1.9  of the  PSMA/PSMP License  Agreement, dated  the  date
hereof, by and among Progenics, CYTOGEN and the Company (the "PSMA/PSMP License
Agreement");

               (ii)      research, develop,  manufacture or  have manufactured,
market and  promote or  have marketed  and promoted and otherwise commercialize
products in the Field;

               (iii)     raise capital for the foregoing;

               (iv)      engage in  any and all things necessary, convenient or
incidental thereto; and

               (v)       engage in  any other business or activity lawful under
the Act and authorized by the Management Committee.

     1.5.      Company Authority.    The  Company  shall  have  the  power  and
authority to  take any  and all  actions necessary,  appropriate, convenient or
incidental to  or for  the  furtherance  of  the  purposes  set  forth  herein,
including all of the powers of a limited liability company under the Act.

     1.6.      Term.   The term of the Company (the "Term") shall commence upon
the date the Certificate is filed as required by the Act and shall be perpetual
unless terminated as provided in this Agreement.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

<PAGE>
     1.7.      Registered Agent.   The  name and  address in  Delaware  of  the
Company's registered  agent upon  whom and at which process against the Company
can be  served is  Corporation Service  Company, 1013  Centre Road, Wilmington,
Delaware 19805, or such other person or such other persons as may be designated
by the Management Committee.

     1.8.      Members  and   Initial  Contribution.     The   names,  taxpayer
identification numbers  and present  mailing  addresses  of  the  members  (the
"Members") of  the Company  are set  forth in  Schedule A attached hereto.  The
initial ownership  interest in the Company of each of Progenics and CYTOGEN, as
the initial  Members, shall  be 50%.  Each Member's interest in the Company (an
"Interest") shall at all times be equal to such Member's Percentage, as defined
in Section  2.2 hereof.   The Interest of each Member is subject to change from
time to  time as provided herein.  Each of Progenics and CYTOGEN is admitted as
a Member  of the Company effective contemporaneously with the execution by such
person of this Agreement.

     1.9.      Additional Members.   Additional  persons  or  entities  may  be
admitted as  Members of  the Company  only upon  the prior  written consent  or
approval of  the Management Committee, which may grant or withhold admission in
its sole and absolute discretion.

                                  ARTICLE II
                                CAPITALIZATION

     2.1.      Capital Accounts.

     (a)       An individual  capital account  (the "Capital Account") shall be
maintained for  each Member  in accordance with the capital account maintenance
rules set  forth in  Treasury Regulation  Section 1.704-1(b).  Without limiting
the generality  of the foregoing, a Member's Capital Account shall be increased
by (a)  the amount  of money  contributed by the Member to the Company, (b) the
fair market  value of  property (other  than Intellectual  Property (as defined
below) unless  all Members  shall agree  to assign a value to such property for
purposes of  this Article  II hereafter  contributed  by  such  Member  to  the
Company, net  of liabilities  secured by  such property, and (c) allocations to
the Member  of the  Company's net  income and  gains (as determined for federal
income tax  purposes but  on the  basis of  the book  values of  the  Company's
assets).   A Member's  Capital Account  shall be decreased by (i) the amount of
money distributed  to the  Member, (ii)  the fair  market value of any property
(other than  any Intellectual  Property transferred  previously by Progenics or
CYTOGEN to  the Company  without any  value being  reflected in  the transferor
Member's Capital  Account if  such property  is reconveyed  to  the  transferor
Member) distributed  to the Member, as determined by the distributee Member and
the Company  (net of  any liabilities  secured by the property) after adjusting
each Member's  Capital Account by such Member's share of the unrealized income,
gain, loss and deduction inherent in such property and not previously reflected
in such  Capital Account,  as if  the property  had been sold for its then fair
market value  on the  date of  distribution, (iii)  expenditures described,  or
treated under  Section 704(b) of the Code as described, in Section 705(a)(2)(B)
of the  Code, and  (iv) the  Member's share  of losses  and  deductions.    For
purposes of  this Agreement,  "Intellectual Property"  shall include inventions
(patented  or  unpatented),  improvements,  rights  under  patents  and  patent
applications,  unpublished  research  and  development  information,  formulae,
processes, expertise, know-how, trade secrets and technical data.

     (b)       This Section  2.1 and  the other  provisions of  this  Agreement
relating to  maintenance of  Capital  Accounts  are  intended  to  comply  with
Treasury Regulation  Section 1.704-1(b) and shall be interpreted and applied in
a manner  consistent  with  such  Treasury  Regulations.    In  the  event  the
Management Committee shall determine that it is prudent to modify the manner in
which the  Capital Accounts,  or any debits or credits thereto, are computed in
order to  comply with  such Treasury  Regulations, the Management Committee may
make such  modification; provided,  however, that  it shall not have an adverse
effect on the amounts distributable to any Member.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      2

<PAGE>
     2.2.      Capital Contributions.

     (a)       Each Member's  share of  Capital Contributions and each Member's
Percentage (each  as defined  hereinafter) shall  be set  forth on  Schedule A,
which shall  be updated  by the  Management Committee  upon any  changes in any
Member's share  of total  Capital Contributions.   As used herein, (i) the term
"Capital Contribution"  shall mean a contribution to the capital of the Company
made by  a Member  pursuant to this Agreement, (ii) the term "Percentage" shall
mean a  Member's share  of the  Adjusted Capital  Contributions expressed  as a
percentage of  the aggregate Adjusted Capital Contributions of all Members; and
(iii) the  term "Adjusted  Capital Contributions" shall mean a Member's Capital
Contributions as  adjusted  pursuant  to  the  terms  of  this  Agreement  (but
excluding, for  these purposes,  in the  case of  Progenics, the  Progenics R&D
Capital Contributions  as defined in Section 2.2(d) hereof and the Supplemental
Capital Contributions  as defined  in Section 2.2(e) hereof and, in the case of
CYTOGEN, any [*   *   *] as defined in Section 2.2(e) hereof).

     (b)       Simultaneously herewith,  the Members  are contributing  to  the
Company cash in the amounts set forth on Schedule A.

     (c)       (i)   The  Management  Committee  may  from  time  to  time,  in
connection with  preparing the  Budget (as  defined hereinafter)  or otherwise,
call for  the Members to make additional capital contributions (the "Additional
Capital Contributions"),  in which  event the  Management Committee  shall give
notice to  each Member  of:   (A) the  total amount  of the  Additional Capital
Contribution being  called; (B)  the reason the Additional Capital Contribution
is being  called; (C) each Member's proportionate share of the total Additional
Capital Contribution  (determined in  accordance with  this Section 2.2(c); and
(D) the date the Additional Capital Contribution is due and payable, which date
shall not, without the written consent of the Members, be less than 30 nor more
than 90 calendar days after the notice has been given.  A Member's share of the
total Additional Capital Contribution shall be equal to the product obtained by
multiplying  the   Member's  Percentage   and  the   total  Additional  Capital
Contribution required.  A Member's share shall be payable in cash, by certified
check or  wire transfer.   No Additional Capital Contribution by any Member may
be made or required to be made on an in-kind or any other non-cash basis unless
consented to in writing by each of the Members.  Upon payment of the Additional
Capital Contributions,  the Capital  Contributions  of  each  Member  shall  be
adjusted.

               (ii)      If a  Member (the  "Non-Contributing Member") fails to
pay when  due all  or any portion of any Additional Capital Contribution called
by the  Management Committee  (the  amount  not  contributed  being  a  "Failed
Contribution"), and  the other  Member (the "Contributing Member") makes proper
and timely  payment of its portion of the Additional Capital Contribution, then
the following adjustments shall be made:

                    (1)       the Adjusted  Capital Contributions  of the  Non-
Contributing Member  shall automatically and without further act on the part of
any party  be adjusted  by reducing the amount of the Non-Contributing Member's
Adjusted Capital Contributions by 10% (the "Reduction Amount") of the amount of
the Failed  Contribution and increasing the amount of the Contributing Member's
Adjusted Capital Contributions by the Reduction Amount; and

                    (2)       the Percentages  of the Members shall be adjusted
to stand  in the  ratio of their respective Adjusted Capital Contributions, and
Schedule A shall be amended accordingly.

               (iii)     If a Non-Contributing Member fails to pay when due all
or any  portion of  any Additional  Capital  Contribution  called  for  by  the
Management Committee,  the Management  Committee shall  give  notice  (a  "Non-
Contribution Notice")  within 15  days after  the date  such Additional Capital
Contribution  is   due  and   payable  to  the  Contributing  Member,  and  the
Contributing Member  shall have  the option (but not the obligation) to make an
Additional  Capital   Contribution  by  reason  of  such  default  (a  "Default
Contribution") to  the Company  in an  amount  not  in  excess  of  the  Failed
Contribution.   Any Default  Contribution, if  made, must  be funded  within 30
calendar days  after delivery  of  the  Non-Contribution  Notice,  or,  if  the
Management Committee  shall fail to give the Non-Contribution Notice, within 45
calendar days  after the  date such  Additional Capital Contribution is due and
payable.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      3

<PAGE>
               (iv)      Except as  expressly stated herein, no Member shall be
required to  contribute any  additional capital  to the  Company, and no Member
shall have  any personal  liability for  any debt, obligations, or liability of
the Company.  The rights provided in this Section 2.2(c) shall be the exclusive
remedies available  to the Company and any Contributing Member against any Non-
Contributing Member  for such Non-Contributing Member's failure to pay when due
any Additional Capital Contribution called for by the Management Committee.

     (d)       Progenics  shall   be  required   to  make   additional  Capital
Contributions to the Company of up to $3 million to fund the Company's research
and development  programs as  budgeted in  the work  plans (the  "Work  Plans")
described in  Section 2 of the Services Agreement, dated as of the date hereof,
between Progenics,  CYTOGEN and the Company (the "Services Agreement"), subject
to the  terms and  conditions described  below.   The  amounts  so  funded  are
referred to  herein as  the "Progenics R&D Capital Contributions."  [*   *   *]
The Progenics  R&D Capital Contributions shall be provided and applied when and
as needed  (as determined  in  the  reasonable  discretion  of  the  Management
Committee) to  fund the Company's research and development programs through and
including the  filing by the Company of an Investigational New Drug application
with the  U.S. Food  and Drug  Administration (the  "FDA") with  respect  to  a
product under  development by  the Company  (an "IND Filing").  Progenics shall
not be  obligated to  fund through  Progenics R&D  Capital  Contributions,  and
Progenics R&D  Capital Contributions  shall not  be applied  to  fund  (i)  any
clinical development  or other  activities of  the Company  with respect  to  a
product beyond  an IND  Filing or (ii) any administrative or other non-research
and development  functions, activities  or expenses.   During the period ending
with the  discharge in full of Progenics' funding obligation under this Section
2.2(d), Progenics  shall have  the right  to  direct  the  application  of  the
Progenics  R&D  Capital  Contributions  in  accordance  with  the  Work  Plans.
Notwithstanding the  foregoing, if  Progenics ceases  to be  a  Member  in  the
Company before  Progenics has  funded  to  the  Company  all  amounts  required
pursuant to  this Section  2.2(d), Progenics  shall be  relieved of its funding
obligation  with   respect  to  such  portion  of  the  Progenics  R&D  Capital
Contributions not theretofore funded.

     (e)       [*   *   *] The parties intend that such reduction in Progenics'
obligation to  make Progenics  R&D Capital Contributions shall reduce Progenics
R&D Capital  Contributions applied  to  fund  development  of  a  vaccine-based
product. [*   *   *]

     (f)       Progenics  shall   be  required   to  make   additional  Capital
Contributions (the  "Supplemental Capital Contributions") to the Company in the
following amounts not later than five business days after the dates indicated:

 Amount         Date

 $500,000       The date of this Agreement;

 $500,000       On the earlier to occur of (i) the date that is six months
                after the date of this Agreement or December 31, 1999;

 $500,000       On the  earlier to  occur of  (i) the  date on  which  the
                Management Committee  by written  resolution identifies  a
                lead compound for product development or (ii) December 31,
                2000; and

 $500,000       On the  earlier to  occur of (i) the date on which the FDA
                approves an  Investigational  New  Drug  application  with
                respect to a Licensed Product (as defined in the PSMA/PSMP
                License Agreement) or (ii) December 31, 2001.

Notwithstanding the foregoing, Progenics shall have no obligation to make any
Supplemental Capital Contribution if at the time any such capital contribution
is due Progenics is not a member of the Company.

     (g)       No Member  shall be  paid interest on its Capital Contributions.
Except as  otherwise provided in this Agreement, no Member shall have the right
to receive any return of or on any Capital Contribution.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      4

<PAGE>
     2.3.      Loans.   The Management  Committee may,  in its sole discretion,
authorize and  cause the Company to borrow from any person (including a Member)
on such  terms and subject to such conditions as the Management Committee shall
determine.   No Member  shall be  required to  lend funds  to the Company or to
guarantee or  provide security or any other form of credit support with respect
to any such borrowing.

     2.4.      Budget.

     (a)       The Management Committee shall promptly prepare a budget for the
Company's activities  covering such  time period  as the  Management  Committee
shall deem  appropriate.   The Budget  may include  provisions  for  Additional
Capital Contributions  to made  by the Members.  The Management Committee shall
meet to  review and  update the  Budget on  a semi-annual  basis or  as it  may
otherwise determine to be appropriate.

     (b)       If at  any time the Management Committee is unable to agree upon
a proposed Budget or a proposed update to the Budget (a "Budget Dispute"), such
disagreement will  be resolved  in  accordance  with  the  management  deadlock
provisions contained  in Section 4.1(f) hereof (provided that if any portion of
the Budget  is not  in dispute, the provisions of such undisputed portion shall
be implemented to the extent practicable).  If a Budget Dispute is submitted to
arbitration, and  the arbitrator  determines that  a Member (the "Uncooperative
Member") acted  in bad faith in unreasonably withholding approval of a proposed
Budget, the  Adjusted Capital Contributions of the Uncooperative Member and the
other Member  shall without further act on the part of any party be adjusted by
reducing  the   amount  of   the  Uncooperative   Member's   Adjusted   Capital
Contributions by  the greater  of (A) [*   *   *] of the Uncooperative Member's
pro  rata  share  of  any  Additional  Capital  Contribution  required  by  the
arbitrator (if  the dispute involved an Additional Capital Contribution) or (B)
[*    *    *] of the Uncooperative Member's Adjusted Capital Contributions, and
increasing the  amount of  the other Member's Adjusted Capital Contributions by
such amount.

                                  ARTICLE III
                       PROFITS, LOSSES AND DISTRIBUTIONS

     3.1.      Allocation of Profits and Losses

     (a)       The Company's  profits and  losses (as  determined  for  federal
income tax  purposes but  as adjusted  under the  rules of  Treasury Regulation
Section 1.704-1(b)(2)(iv))  for each  Fiscal Year  shall be  allocated  to  the
Members (i)  first, in such amounts as will adjust the Capital Account balances
of each  of the Members to be in the same proportion as the Members' respective
Percentages and  (ii) thereafter,  in  proportion  to  the  Members  respective
Percentages.

     (b)       Notwithstanding Section 3.1(a) hereof, losses allocated pursuant
to Section  3.1(a) to  any Member  for any  Fiscal Year  shall not  exceed  the
maximum amount  of loss  that may  be allocated  to such Member without causing
such  Member   to  have   an  Adjusted  Capital  Account  Deficit  (as  defined
hereinafter) at  the end  of such  Fiscal Year.   Any  loss in  excess  of  the
limitation in  this Section  3.1(b) shall  be specially allocated solely to the
other  Members  to  the  maximum  extent  permitted  by  this  Section  3.1(b).
"Adjusted Capital  Account Deficit"  means a  deficit Capital  Account  balance
after that  balance has  been adjusted pursuant to the penultimate sentences of
Treasury Regulations Sections 1.704-2(g)(1) and 1.704-2(i)(5).

     (c)       Notwithstanding Section  3.1(a) hereof,  the  following  special
allocations shall  be made  in the  following order prior to the application of
Section 3.1(a) hereof:

               (i)       If there  is a  net decrease  in Company  minimum gain
("Minimum Gain")  (as such  decrease is  determined  as  provided  in  Treasury
Regulations Sections 1.704-2(d) and 1.704-2(g)) during any Fiscal Year, certain
items of income and gain, including gross income or gain, shall be allocated to
the Members in the amounts and manner described in Treasury Regulations Section
1.704-2(f).  This Section 3.1(c)(i) is intended to comply with the minimum gain
chargeback requirement  relating to  partnership non-recourse  liabilities  (as
defined in Treasury Regulations Section 1.704-2(b) and shall be so interpreted

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      5

<PAGE>
               (ii)      If  there   is  a   net  decrease   in  Minimum   Gain
attributable to  partner non-recourse  debt (determined  pursuant  to  Treasury
Regulations Section 1.704-2(i)) during any Fiscal Year, certain items of income
and gain,  including gross  income or  gain, shall  be allocated  as quickly as
possible to those Members which had a share of the Minimum Gain attributable to
the partner non-recourse debt (such share to be determined pursuant to Treasury
Regulations Section  1.704-1(i)(5)) in  the amounts  and  manner  described  in
Treasury Regulations  Sections 1.704-2(i)  and (j).  This Section 3.1(c)(ii) is
intended to  comply with  the minimum  gain chargeback  requirement relating to
partner  non-recourse   debt  set   forth  in   Treasury  Regulations   Section
1.704-2(i)(4)) and shall be so interpreted.

               (iii)     Deductions attributable to obligations with respect to
which a  Member bears  the economic risk of loss within the meaning of Treasury
Regulation Section  1.704-2(b)(4) shall  be allocated  to the Member or Members
that bear  the economic  risk of  loss for  such debt  in accordance  with  the
requirements  of  Treasury  Regulation  Section  1.704-2(i)(1).    "Nonrecourse
Deductions"  (as   such  term  is  defined  in  Treasury  Regulations  Sections
1.704-2(b)(1) and  1.704-2(c)) of the Company shall be allocated to the Members
in proportion to their Percentages.

               (iv)      If one  or more  of the  Members unexpectedly receives
any adjustment,  allocation or  distribution described  in Treasury Regulations
Sections 1.704-1  (b)(2)(ii)(d)(4), (5)  or (6),  then items of income and gain
shall be specially allocated to such Members in an amount and manner sufficient
to eliminate  the Adjusted Capital Account Deficit created by such adjustments,
allocations  or   distributions  as  quickly  as  possible,  provided  that  an
allocation pursuant to this Section 3.1(c)(iv) shall be made only if and to the
extent that  such Member  would have  an Adjusted Capital Account Deficit after
all other  allocations provided  for in  this Section 3.1 have been tentatively
made as  if this Section 3.1(c)(iv) were not in this Agreement.  This provision
is intended  to qualify  as a  "qualified income  offset" within the meaning of
Treasury Regulations Section 1.704-1(b)(2)(ii)(d).

               (v)       If one  or more  of the  Members has a deficit Capital
Account at  the end of any Fiscal Year which is in excess of the sum of (i) the
amount such Member is obligated to contribute pursuant to any provision of this
Agreement and  (ii) the amount such Member is deemed to be obligated to restore
pursuant  to   the  penultimate  sentences  of  Treasury  Regulations  Sections
1.704-2(g)(1) and  1.704-2(i)(5), each such Member shall be specially allocated
items of  Company income  and gain  in the  amount of such excess as quickly as
possible, provided  that an allocation pursuant to this Section 3.1(c)(v) shall
be made only if and to the extent that such Member would have a deficit Capital
Account in  excess of such sum after all other allocations provided for in this
Section 3.1  have been  made as  if Section  3.1(c)(iv) hereof and this Section
3.1(c)(v) were not in the Agreement.

               (vi)      The allocations  set  forth  in  Sections  3.1(b)  and
3.1(c)(i)-(v) hereof (the "Regulatory Allocations") are intended to comply with
certain requirements  of the  Treasury Regulations.  It is  the intent  of  the
Members that,  to the  extent possible,  all Regulatory  Allocations  shall  be
offset either  with other Regulatory Allocations or with special allocations of
other items of Company income, gain, loss or deduction pursuant to this Section
3.1(c)(vi).   Therefore, the  Management Committee  shall make  such offsetting
special allocations  of Company  income, gain,  loss and  deduction in whatever
manner they  determine appropriate,  so that, after such offsetting allocations
are made,  each Member's  Capital Account  balance is,  to the extent possible,
equal to  the Capital  Account balance such Member would have if the Regulatory
Allocations were not part of the Agreement and all Company items were allocated
pursuant to  Section 3.1(a).   In  exercising its  discretion,  the  Management
Committee shall  take into  account future  Regulatory Allocations  pursuant to
Sections 3.1(c)(i)  and (ii)  hereof that, although not yet made, are likely to
offset other  Regulatory Allocations  previously made under Section 3.1(c)(iii)
hereof.

               (vii)      If  the Internal  Revenue Service reallocates an item
of income, deduction or loss to a Member or an affiliate ("Affiliate") pursuant
to Section  482 of  the Code or any similar rule or principle of law (a "Member
Section 482  Allocation"), and the Company has a corresponding correlative item
of deduction,  loss or  income (as  determined under  Section 1.482-1(g) of the
Regulations (the  "Company Correlative  Item"), such  Company Correlative  Item
shall be  specially allocated  to and  reflected in  the Capital Account of the
Member that  received (or  whose Affiliate  received) such  Member Section  482
Allocation, and  a corresponding  deemed  contribution  or  distribution  shall
likewise be credited or debited to the Capital Account of such Member.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      6

<PAGE>
               (viii)    If the Internal Revenue Service reallocates an item of
income, deduction or loss to the Company pursuant to Section 482 of the Code or
any similar  rule or principle of law (a "Company Section 482 Allocation"), and
any Member  has a  corresponding correlative  item of deduction, loss or income
(as determined  under  Section  1.482-1(g)  of  the  Regulations  (the  "Member
Correlative Item")),  such Company  Section 482  Allocation shall  be specially
allocated to  and reflected  in the Capital Account of the Member that received
(or whose Affiliate received) such Member Correlative Item, and a corresponding
deemed contribution  or distribution  shall likewise  be credited or debited to
the Capital Account of such Member.

               (ix)      If any  Member is  required to contribute an amount to
the Company  pursuant to  the last  sentence of  Section  3.9  hereof,  special
allocations of gross items of income, gain, loss and deduction shall be made to
the Members  to  ensure  that  after  such  contribution  and  all  liquidating
distributions to  the Members,  each of  the Members'  Capital Account balances
will equal zero.

     3.2.      Allocation-Rules

     (a)       For purposes  of determining  the profits,  losses or  any other
items allocable  to any  period, profits, losses and any such other items shall
be determined  on a  daily, monthly  or  other  basis,  as  determined  by  the
Management Committee  using any method that is permissible under Section 706 of
the Code and the Treasury Regulations thereunder.

     (b)       The Members  are aware  of the  income tax  consequences of  the
allocations made  by this  Article III  and hereby  agree to  be bound  by  the
provisions of  this Article III in reporting their shares of Company income and
loss for income tax purposes.

     3.3.      Tax Allocations: Section 704(c) of the Code

     (a)       In accordance  with Section  704(c) of the Code and the Treasury
Regulations thereunder,  income, gain,  loss and  deduction with respect to any
property contributed  to the  capital of the Company or which has been adjusted
pursuant to Treasury Regulation Section 1.704-1 (b)(2)(iv)(f) shall, solely for
income tax  purposes, be  allocated among  the Members so as to take account of
any variation  between the  adjusted basis  of such property to the Company for
federal income  tax purposes and its fair market value reflected in the capital
accounts initially or on adjustment, as the case may be.

     (b)       Any elections  or other  decisions relating to allocations under
this Section  3.3 shall  be made by the Management Committee in any manner that
reasonably reflects  the purpose  and intention  of this Agreement. Allocations
pursuant to  this Section  3.3 are  solely for  purposes of  federal, state and
local taxes  and shall  not affect,  or in  any way  be taken  into account  in
computing, any  Member's Capital  Account or  share of  profits, losses,  other
items or distributions pursuant to any provision of this Agreement.

     3.4.      Fiscal Year.   The  Fiscal Year  of the Company for both tax and
accounting purposes (the "Fiscal Year") shall be the calendar year.

     3.5.      Partnership for Tax Purposes.  The Members hereby agree that the
Company shall  be treated  as a  partnership for  tax purposes under the United
States federal,  state and  local income  tax laws  or other  laws, and further
agree not  to take  any position  or to  make any  election, in a tax return or
otherwise, inconsistent herewith,

     3.6.      Tax Matters.

     (a)       The tax  matters partner ("Tax Matters Partner") for purposes of
Section 623  of the  Code shall be Progenics. Unless otherwise required by law,
the Tax  Matters Partner (i) shall not take any action pursuant to this Section
3.6 unless  such action  has been  consented to  by each  Member and (ii) shall
perform all such duties and responsibilities as directed by each Member.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      7

<PAGE>
     (b)       All elections  by the  Company  for  income  and  franchise  tax
purposes and  all determinations  regarding the  book  basis,  depreciation  or
amortization of  any Company  assets, and all other matters relating to all tax
returns  (including   amended  returns),  including  the  characterization  and
allocation of  income and  loss, filed by the Company, including tax audits and
related matters  and controversies,  shall be  made and  conducted by  the  Tax
Matters Partner  at the expense of the Company, subject to the approval of each
Member.   The Tax  Matters Partner  shall, at  the expense  of the  Company and
subject to  the approval of each Member, cause to be prepared and filed all tax
returns (including  amended returns)  required to  be  filed  by  the  Company;
provided, however,  that CYTOGEN  shall have  the opportunity to review any and
all tax  returns in  advance of such filing.  In the event of a dispute between
the Members concerning the preparation and filing of the Company's tax returns,
the Members  hereby agree  to submit  the dispute  to arbitration to one of the
major nationally-recognized  certified public  accounting firms, whose decision
on the matter shall be final and binding.

     (c)       The  Tax   Matters  Partner   shall  be   responsible  for   all
negotiations on  behalf of the Company with the Internal Revenue Service or the
Departments of the Treasury or Justice or any state or local tax authority with
respect to  the income  tax treatment  of Company items, and shall provide each
Member with  the opportunity,  at the expense of the Company, to participate in
any such  negotiations.  The Tax Matters Partner shall not bind any Member to a
settlement agreement  unless each  Member has given its written consent to such
agreement.

     3.7.      Cash Flow Distributions.  Cash flow distributions of the Company
shall be made only after payment of all liabilities and expenses of the Company
and establishment  of reasonable reserves.  Such distributions shall be made to
the Members  in accordance  with their  Percentages at  such times  and in such
amounts as  determined by  the Management  Committee in its sole, exclusive and
complete discretion.

     3.8.      Liquidating Distributions Upon Dissolution.  Upon dissolution of
the Company, the remaining assets shall be applied as follows:

     (a)       First, to  payment of  the liabilities  of the  Company owing to
third parties  and then  to Members,  as creditors.   After payment of any such
known liabilities,  the Management  Committee  shall  set  up  such  reasonable
reserves as  it deems  reasonably necessary  for any  contingent or  unforeseen
liabilities or  obligations of  the Company.   Such reserves shall be held in a
separate account  for the  purpose of  paying any such contingent or unforeseen
liabilities or  obligations, and,  at the  expiration of  such  period  as  the
Management Committee  may deem advisable, such reserves shall be distributed to
the Members or their assigns in the manner set forth in Section 3.8(b) hereof.

     (b)       Second, to  the Members in accordance with their Capital Account
balances.   If such  distributions are insufficient to return to any Member the
full amount  of its Capital Account, such Member shall have no recourse against
any other  Member.   If the  Management Committee  determines that  the Company
should distribute  any of  its assets in kind, such assets shall, except as set
forth in  the following  sentence, be  distributed on  the basis  of their fair
market values, as determined by an appropriate appraisal procedure as set forth
or approved  by the  Management Committee,  and the  Capital  Accounts  of  the
Members shall  be adjusted  prior to  liquidating distributions  being made  to
reflect how  any resulting gain or loss would have been allocated under Section
3.1 hereof  if such  assets had  been sold.  In the event of a dispute over the
proper valuation  of the Company's in-kind assets, either Member shall have the
right to  submit such  dispute to  arbitration in  accordance with Section 10.2
hereof.   Each Member  shall have  the right to require the Company to make the
distributions set  forth in  this Section  3.8(b) first with any in-kind assets
contributed by  such Member  to the  Company,  but  only  to  the  extent  such
distributions do  not exceed  the amount  to  which  such  Member  is  entitled
pursuant  to   this  Section  3.8(b);  provided,  however,  that  any  and  all
Intellectual Property  transfers  from  a  Member  to  the  Company  that  were
transferred without  any value  being reflected  in  the  transferor's  Capital
Account shall  be reconveyed  to the  transferor in  addition to,  and  without
diminishing, any other distributions to which the transferor shall be entitled.
Upon the  Company's dissolution,  any and  all  rights  to  other  Intellectual
Property, developed  or acquired  by the Company prior to its dissolution (such
Company developments  and acquisitions collectively referred to as the "Company
Inventions"), shall  be co-owned by Progenics and CYTOGEN.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      8

<PAGE>
     3.9.      Tax Distributions.   To  the extent that for any Fiscal Year the
amount of  net income and gains of the Company allocated to each Member exceeds
the amount of losses of the Company allocated to that Member for that and prior
Fiscal Years  reduced by  the amount  of net  income and  gains of  the Company
allocated to the Members for prior Fiscal Years, the Management Committee shall
use reasonable efforts to cause the Company to distribute to each Member, as an
advance against the amounts thereafter distributable to it pursuant to Sections
3.7 and  3.8, no  later than  April 1  of the following year, an amount of cash
equal to  (a) the  amount reasonably  calculated by the Management Committee to
equal the  amount of  the federal, state and local tax liability on that excess
(based on  the highest individual or corporate marginal federal income tax rate
for that  year and  the percentage  with respect  to state and local income tax
rates for that year that the Management Committee determines appropriate), less
(b) the  aggregate amount  of prior distributions by the Company to that Member
for such  Fiscal Year.   No  such distribution  shall be  made, however, to the
extent that  distributions are  restricted under  the  terms  of  any  note  or
agreement relating  to borrowings  by the  Company or  to the  extent that  the
Management Committee determines that the cash is necessary for the operation of
the business  of the Company or for the establishment of reasonable reserves or
if the Company would be rendered insolvent.  The Management Committee shall, to
the extent  practical, make distributions under this Section 3.9 annually based
on projections of income.  If upon the liquidation of the Company the aggregate
amount of  distributions to any Member pursuant to this Section 3.9 exceeds the
aggregate amount  that would  have been  distributed to that Member pursuant to
Sections 3.7  and 3.8  hereof (had there been no distributions pursuant to this
Section 3.9), then that Member shall pay to the Company an amount equal to such
excess, to  be distributed  to the other Member in accordance with Sections 3.7
and 3.8 hereof.

     3.10.     Deficit Capital  Account Restoration.  Except as provided in the
last sentence  of Section  3.9 hereof,  no Member  shall have any obligation to
make Additional  Capital Contributions  to the  Company in order to restore any
deficit Capital  Account balance upon liquidation of the Company or liquidation
of such Member's Interest in the Company.

     3.11.     Other Distributions.   Except  as provided in this Agreement, no
Member shall  be entitled  to receive any distribution from the Company without
the consent of all other Members.

                                  ARTICLE IV
                                  MANAGEMENT

     4.1.      Management Committee

     (a)       Except as  otherwise reserved  to the  Members pursuant  to this
Agreement, the overall management and control of the Company shall be exercised
by the  Members through  a committee  (the "Management  Committee").  Except as
determined by the Management Committee pursuant to this Article IV or otherwise
pursuant to this Agreement, no Member shall have any right or authority to take
any action on behalf of the Company with respect to third parties.

     (b)       The Management  Committee  shall  consist  of  four  individuals
(each,  a  "Representative")  or  such  other  number  of  individuals  as  the
Management Committee  may, from time to time determine.  Of the initial members
of the  Management Committee, two shall be appointed by Progenics and two shall
be  appointed  by  CYTOGEN.  The  initial  Representatives  of  the  Management
Committee are:

          Progenics:     [*   *   *]


          CYTOGEN:       [*   *   *]


Each Representative  shall hold  office until  death, resignation or removal at
the pleasure  of the  Member which appointed such Representative.  If a vacancy
occurs on  the Management  Committee, the  Member which  appointed the vacating
Representative shall appoint such Representative's successor.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      9

<PAGE>
     (c)       Meetings of  the Management  Committee  shall  be  held  on  two
Business Days (as defined herein) written notice (which may be waived and shall
be deemed  to be  waived by  attendance at  the meeting,  unless an  individual
objects, prior to or at the beginning of the meeting, to holding the meeting or
transacting business  at the  meeting).   Attendance may  be in  person  or  by
conference telephone.   Notwithstanding  the number  of Representatives  on the
Management Committee,  each Member's  Representatives shall be required to vote
as a  block ("Voting  Block") on  behalf of such Member.  The Voting Block of a
Member's Representatives  as of  any  given  date  shall  equal  such  Member's
Percentage as  of such date.  The Voting Blocks shall be automatically adjusted
upon any change in Percentage of any appointing Member.  Except as set forth in
the  next  sentence,  the  Management  Committee  shall  act  by  vote  of  the
Representative(s) whose  Voting Block  constitutes more than [*   *   *] of the
aggregate Voting  Blocks of all Representatives, at a meeting of the Management
Committee duly called and held.

               (i)       All Major  Decisions (as defined hereinafter) shall be
made by  a vote  of the  Representative(s) whose  Voting Block constitutes more
than [*     *    *]  of the  aggregate Voting  Blocks of all Representatives (a
"Supermajority Vote").   A  "Major Decision"  means  decisions  concerning  the
merger or  consolidation of the Company or the sale of all or substantially all
of the Company's assets.

               (ii)      The vote of each Member shall be cast by such Member's
Managing Representative (as defined hereinafter).  The Management Committee may
also  act   by  unanimous   written  consent   of  the  Representatives.    The
Representatives shall  not be compensated for their services as such, but shall
be entitled  to indemnification  by the  Company in accordance with Section 4.3
hereof. Any Deadlock (as defined hereinafter) of the Management Committee shall
be resolved pursuant to Section 4.1(f) hereof.

     (d)       Any Representative on the Management Committee (or alternatively
the  Member   who  appointed   such   Representative)   may   appoint   another
Representative on  the Management  Committee to  act for  him or  her, and  the
Management Committee  may delegate in writing, to any of the Representatives or
to any  Member or  to any other agent such authority to act on its behalf or on
behalf of the Company as it shall deem appropriate.

     (e)       Subject to  the other  provisions  of  this  Agreement  and  the
requirements of  applicable law,  the Management Committee shall have the full,
complete and  exclusive power  and  discretion  to  take  all  action  that  it
considers necessary  or desirable  in connection  with the  management  of  the
Company, and  may exercise,  on behalf  of the  Company, all of the powers of a
limited liability  company under  the Act  including, without  limitation,  the
following powers:

               (i)       to enter  into contracts  or agreements  of any  kind,
including selling,  leasing,  conveying,  licensing,  exchanging  or  otherwise
transferring or  disposing of  any Company  property  or  assets,  as  well  as
contracts of guaranty and suretyship with any person including with any Member,
Representative or affiliate of either of them without the vote of the Members;

               (ii)      to determine the strategies and methods for developing
and commercializing  products and  for  exploiting  the  intellectual  property
rights of the Company;

               (iii)     to establish  and maintain, or cause to be maintained,
the Capital Accounts of the Members and the books and records of the Company as
required by law and by this Agreement;

               (iv)      to appoint  such Officers  (as defined hereinafter) of
the Company as the Management Committee determines desirable, and such Officers
of the Company:

                    (1)       need not be members or Representatives;

                    (2)       shall have  the powers  and duties  delegated  to
them by the Management Committee; and

                    (3)       shall serve  at the  pleasure of  the  Management
Committee;.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      10

<PAGE>
               (v)       to  employ   and   dismiss   attorneys,   accountants,
independent auditors,  custodians, brokers and such other advisers or agents in
connection with  any matter relating to the business of the Company (including,
without limitation,  the Representatives on the Management Committee or persons
or firms  affiliated with them) and to make payment for such services and other
expenses out of the funds of the Company;

               (vi)      to open,  maintain and  close bank  accounts  for  the
Company;

               (vii)     to sign checks of the Company;

               (viii)    to admit additional members to the Company;

               (ix)      to call meetings of the Members of the Company;

               (x)       to declare and make distributions;

               (xi)      to permit,  require or prohibit withdrawals of capital
from and Capital Contributions to the Company;

               (xii)     to hold  part of  the assets  of the  Company in  cash
without liability  for interest  or the  payment of  expenses or  the making of
distributions therewith;

               (xiii)    to  determine  the  accounting  period  or  accounting
periods to  which any  income, gain,  obligation, loss, liability, deduction or
expense is attributable;

               (xiv)     to  prepare,   execute  and   file  tax   returns   or
information returns  for the  Company and  to make  tax elections  as they deem
appropriate, subject to the provisions of Section 3.6 hereof;

               (xv)      to incur indebtedness for any purpose;

               (xvi)     to make  loans, including  loans to  Members,  and  to
provide indemnification  or  guarantee  the  indebtedness  and  obligations  of
others, including Members;

               (xvii)    to  settle,   compromise,  assign,  pledge,  transfer,
release, submit  to arbitration, or stipulate to judgment, or consent to do the
same, any claim, suit, demand or judgment against the Company;

               (xviii)   to  delegate   authority  to  subcommittees,  Members,
Representatives, Officers  or other  parties to  take actions  on behalf of the
Company consistent with the terms of this Agreement and to execute documents on
behalf of the Company in connection therewith; and

               (xix)     to bring, threaten to bring or prosecute, on behalf of
the Company, any claim in a judicial proceeding or arbitration forum.

     (f)       If, at  any time  the vote  of the  Representatives required  to
approve action  with respect to a particular matter has not been obtained after
comprehensive discussion  between the  Representatives,  and  such  failure  to
obtain the requisite vote impedes in any material respect the Company's ability
to continue  its  business  (the  "Deadlock"),  the  Deadlock  shall  first  be
submitted (the "Submission") by the Management Committee (but if the Management
Committee cannot  agree on  the  form  or  substance  of  the  Submission,  the
Submission may be made by any Representative) to the Chief Executive Officer of
Progenics and the Chief Executive Officer of CYTOGEN for review and discussion.
Such persons  shall meet as soon as possible after the Submission is given, and
in any  event within  ten calendar  days, and endeavor in good faith to resolve
the matter.   If  these officers  do not,  within ten  calendar days after they
first meet,  or within 20 calendar days after the Submission is given, mutually
resolve the  Deadlock or  agree on  a method  of resolving the Deadlock, either
Member may,  within the  30 calendar day period following such 20 calendar days
after delivery  of the  Submission, by written notice given to the other Member
within such  30 day  period, cause  the Deadlock to be submitted to arbitration
pursuant to Section 10.2 hereof.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      11

<PAGE>
     (g)       (i)       If  submission   of  a   Deadlock  to  the  procedures
described in  Section 4.1(f)  does not,  within the  time periods  specified in
Section 4.1(f)  hereof, result in resolution of the Deadlock, submission of the
Deadlock to  arbitration or  agreement by the Members on an alternative dispute
resolution procedure,  either party  may elect  to exercise  the buy/sell right
contained in  this Section  4.1(g) (the "Buy/Sell Right").  The Member electing
to exercise  the Buy/Sell Right (the "Offeror") shall furnish in writing to the
other Member  (the "Offeree")  the Offeror's irrevocable, unconditional (except
as provided  herein) and binding offer (such notice being referred to herein as
the "Exercise  Notice") to  purchase the  Offeree's Interest  or  to  sell  the
Offeror's Interest  for a  cash purchase  price determined  in accordance  with
Section 4.1(g)(ii)  hereof (the  "Purchase Price").   The Exercise Notice shall
set forth  an amount  expressed  in  dollars  and  without  contingencies  (the
"Valuation"), which  amount shall  be used  to calculate,  in  accordance  with
Section 4.1(g)(ii)  hereof, the  Purchase Price.   The Valuation is intended to
represent the  amount that  would be  payable for  100% of the Interests of the
Company.   Within 15  calendar days  after the  Exercise Notice  is given,  the
Offeree may  give notice  to the  Offeror  of  its  irrevocable,  unconditional
(except as provided herein) and binding election either:

                    (1)       to purchase  the entire  Interest of  the Offeror
for an amount in cash equal to the Purchase Price; or

                    (2)       to sell its entire Interest to the Offeror for an
amount in cash equal to the Purchase Price.

Failure of  the Offeree  to give  notice of its decision within such applicable
time period  shall constitute  a conclusive election by the Offeree to sell its
entire Interest pursuant to this Section 4.1(g)(i).

               (ii)      The Purchase  Price shall  be equal  to  the  seller's
Percentage multiplied by the Valuation.

               (iii)     Subject  to   the  provisions  of  Section  4.1(g)(iv)
hereof, a  transfer of  Interests pursuant  to this  Section 4.1(g)  shall take
place at a closing to be held on a day other than Saturday, Sunday or any other
day on  which commercial  banks located in New York, New York are authorized by
law to be closed for business ("Business Day").  Such date shall be selected by
and set forth in a notice by the Offeror given promptly after the Offeree gives
notice of  its election  under Section 4.1(g)(i) hereof, which date shall be at
least ten  days but  prior to  20 days  after the  Offeree gives  notice of its
election under Section 4.1(g)(i), at such location in New York, New York as the
Offeror selects  or as otherwise agreed to by the parties.  In such notice, the
purchasing Member  shall additionally  specify whether  the purchase will be by
the Member,  the Company,  a combination  of the Company and the Member, and/or
the designee(s)  of the  Company and/or  the designee(s)  of  the  Member  (the
"Purchaser").  At the closing, the Purchase Price specified above shall be paid
by the  Purchaser by wire transfer of immediately available federal funds to an
account designated  by the  selling Member.  The terms of the purchase and sale
shall be  unconditional, except  that the  selling Member  shall represent  and
warrant to the Purchaser that its Interest in the Company is not subject to any
legal or  equitable claims  (other than  legal  or  equitable  claims  to  such
Interest, if  any, of  the Purchaser  pursuant to  this  Agreement)  and  shall
deliver at  the  closing  an  instrument  confirming  such  representation  and
warranty.   In addition,  the Purchaser  shall represent  and  warrant  to  the
selling Member  that it  has the  full right, power and authority to effectuate
the purchase  and upon  demand shall  deliver  at  the  closing  an  instrument
confirming such  representation and  warranty.   Upon the  sale of  a  Member's
Interest in  the Company  pursuant to this Section 4.1(g), the selling Member's
appointed Representatives  shall be  deemed to have automatically resigned from
the Management Committee.

               (iv)      The closing  date set  forth  in  Section  4.1(g)(iii)
hereof shall be postponed if any required regulatory filings have not been made
or any  required consents  or approvals (regulatory or otherwise) have not been
received by  such closing  date, but  only until such filings have been made or
such consents  have been  received and,  if applicable, until the expiration or
earlier termination  of the  applicable waiting  period under  the  Hart-Scott-
Rodino Antitrust  Improvements Act  of 1976,  as amended  (the "HSR Act").  The
Members hereby agree to use their reasonable best efforts and to cooperate with
each other  to effect  any such  required regulatory filings, including but not
limited to,  a filing  under the HSR Act, if applicable, and to obtain any such
required consents  or approvals,  in order  to close  a transfer  of  Interests
pursuant to this Section 4.1(g).

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      12

<PAGE>
               (v)       The consummation  of any purchase or sale of Interests
pursuant to  this Section  4.1(g) shall  be subject  to the satisfaction of the
provisions of Section 6.2 hereof.

     (h)       Each  of  Progenics  and  CYTOGEN  shall  appoint  one  managing
Representative (the "Managing Representative") from the Representatives.  Every
contract, agreement, certificate, document or other instrument executed by both
Managing Representatives  shall be conclusive evidence in favor of every person
relying thereon  or claiming  thereunder that,  at the  time  of  the  delivery
thereof, (1)  the Company  was in  existence, (2)  this Agreement  had not been
terminated or  canceled or  amended in  any  manner  so  as  to  restrict  such
authority (except  as shown in any instrument duly filed under the Act) and (3)
the execution  and delivery  thereof was  duly  authorized  by  the  Management
Committee.   Any person  dealing with  the Company  or the Management Committee
may, until  and unless  subsequently notified by both Managing Representatives,
rely on a certificate signed by both Managing Representatives hereunder:

               (i)       as  to   who  are  the  Representatives  and  Managing
Representatives hereunder;

               (ii)      as to  the existence  or nonexistence  of any  fact or
facts which constitute conditions precedent to acts by the Management Committee
or are in any other manner germane to the affairs of the Company;

               (iii)     as to  who is  authorized to  execute and  deliver any
instrument, contract, agreement, certificate or document for the Company;

               (iv)      as to  the authenticity  of any copy of this Agreement
and amendments thereto; or

               (v)       as to  any act  or failure to act by the Company or as
to any other matter whatsoever involving the Company.

     (i)       The  Management   Committee  shall   establish  an  Intellectual
Property subcommittee, composed of such members of the Management Committee, or
such other  persons, as  the Management  Committee may  determine and with such
authority as  may be  delegated thereto.   The  Intellectual Property Committee
shall have  responsibility for  establishing and  implementing, in consultation
with counsel,  the Company's  strategies for  creating and/or  maintaining  its
patent estate.

     4.2.      Meetings of  Members.   The Members  shall meet on such periodic
basis as  the Management  Committee may  determine.   Special meetings  of  the
Members, for any purpose or purposes, may be called by the Management Committee
or by  any Member  of the Company.  All meetings shall be held at the Company's
principal place  of business or at any other place designated by the Management
Committee, and,  unless otherwise  prohibited by law, may be conducted by means
of conference  telephone or  similar communication equipment, in the discretion
of the  Management Committee.   Not  less than  two Business  Days before  each
meeting, the  Management Committee  shall give written notice of the meeting to
each Member entitled to vote at the meeting.  The notice shall state the place,
date,  hour  and  purpose  of  the  meeting.    Notwithstanding  the  foregoing
provisions, each  Member who  is entitled  to notice  shall be  deemed to  have
waived notice  if such  Member attends the meeting, unless such Member objects,
prior to  or at  the beginning  of the  meeting,  to  holding  the  meeting  or
transacting business  at the  meeting.   At any  such meeting  of Members,  the
presence in  person or  by proxy  of the  Members holding  an  aggregate  of  a
majority in Interests constitutes a quorum.  A member may vote either in person
or by  written proxy signed by or on behalf of the Member or by or on behalf of
the Member's duly authorized attorney-in-fact.

In lieu  of holding a meeting, the Members may vote or otherwise take action by
the unanimous written consent of the Members.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      13

<PAGE>
     4.3.      Liability and Indemnification

     (a)       Except   as   otherwise   provided   by   law,   none   of   the
Representatives, any  Officer  or  any  Member  designated  by  the  Management
Committee to act on its behalf (or any officer, director, employee or affiliate
of any  such Member),  in each  case acting  in such capacity, shall be liable,
responsible or  accountable in  any way for damages or otherwise to the Company
or to  any of  the Members  for (a)  any act or failure to act pursuant to this
Agreement or  otherwise if  (i) such person acted in good faith and in a manner
it reasonably  believed to  be in,  or not  opposed to,  the interests  of  the
Company, (ii)  the conduct  of such person did not constitute gross negligence,
fraud, bad  faith, intentional  misconduct or  a knowing  violation of  law and
(iii) such  person did  not gain a financial benefit to which he or she was not
legally entitled,  or (b) any losses due to the negligence or unauthorized acts
of advisers, consultants or other agents of the Company.

     (b)       The Company  shall indemnify,  defend  and  hold  harmless  each
Representative, each  Officer and any Member designated to act on behalf of the
Management Committee  (and any officer, director, employee and affiliate of any
such Member),  in each  case acting in such capacity (an "Indemnified Person"),
from and  against any  claims, losses,  liabilities, damages, fines, penalties,
costs  and   expenses  (including,  without  limitation,  reasonable  fees  and
disbursements of  counsel  and  other  professionals)  arising  out  of  or  in
connection with  any act or failure to act by an Indemnified Person pursuant to
this Agreement,  or the business and affairs of the Company; provided, however,
that an  Indemnified Person  shall not be entitled to indemnification hereunder
if it  is judicially  determined that  (a) such Indemnified Person's actions or
omissions to act were (i) made in bad faith, (ii) constituted gross negligence,
fraud, intentional  misconduct or a knowing violation of law, or (iii) were the
result of  active and  deliberate dishonesty,  or (b)  such Indemnified  Person
personally gained  a financial  benefit to  which Indemnified  Person  was  not
legally entitled.

     4.4.      Duties, Right to Conduct Other Business

     (a)       To the  extent that,  at law  or in  equity, a  Member  (or  any
officer, director  or employee  of such Member) has duties (including fiduciary
duties) and  liabilities relating thereto to the Company or to the Members, (i)
the Member  (or any  officer, director  or employee of any Member) acting under
this Agreement or otherwise shall not be liable to the Company or to any Member
for its  good faith reliance on the provisions of this Agreement, and (ii) such
Member's duties  and liabilities (or the duties and liabilities of any officer,
director or  employee of  any Member)  may be  expanded or  restricted  by  the
provisions of this Agreement.

     (b)       For so  long as Progenics and CYTOGEN are Members of the Company
and for  a period  of three  years thereafter  (unless the  Company  liquidates
pursuant to  Article VII  hereof), neither  Progenics nor  CYTOGEN will engage,
either directly  or indirectly,  in the  research, development,  manufacturing,
marketing or  commercialization of products in the Field except for the benefit
of the  LLC.   Notwithstanding the foregoing, this Agreement shall not preclude
or limit,  in any  respect, the   rights  of Progenics and CYTOGEN to engage in
activities outside of the Field, whether or not such activities are competitive
with activities  of the  Company, and  neither Progenics nor CYTOGEN shall have
any obligation to offer such business activities to the Company.

     (c)       For so  long as Progenics and CYTOGEN are Members of the Company
and for  a period  of three  years thereafter  (unless the  Company  liquidates
pursuant to Article VII hereof), neither Progenics nor CYTOGEN shall solicit or
induce any  person who is employed by or who is a consultant to or is otherwise
affiliated with  the Company to terminate his or her employment, consultancy or
affiliation with  the Company.   In  addition, for  so long  as  Progenics  and
CYTOGEN are  Members of the Company and for a period of three years thereafter,
neither Progenics  nor CYTOGEN  shall solicit  or  induce  any  person  who  is
employed by  or who  is a  consultant to or otherwise affiliated with the other
Member to  terminate his or her employment, consultancy or affiliation with the
other Member.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      14

<PAGE>
     4.5.      Scientific Advisory Board

     (a)       The Management  Committee shall  be authorized  to  establish  a
Scientific Advisory  Board (the  "SAB").   The SAB  shall be  composed of  such
scientific or  other personnel  as the Management Committee deems advisable and
may include  as members  employees and  consultants of  the Company  as well as
persons otherwise  unaffiliated with  the Company.   The SAB shall meet at such
places and  at such  times as shall be determined as advisable.  The Management
Committee may authorize compensation for members of the SAB in such amounts and
under such terms as the Management Committee may determine.

     4.6.      Research Grants.   Neither  Progenics nor CYTOGEN shall, so long
as such  person is  a member  of the Company, apply to any funding source for a
Research Grant  in the Field unless such application is made for the benefit of
the Company.

                                   ARTICLE V
                                   OFFICERS

     5.1.      Designation,  Authority  and  Compensation  of  Officers.    The
Management Committee  may delegate  such of its authority as it deems advisable
from time  to time to officers of the Company, including, without limitation, a
president,  one  or  more  vice-presidents  and/or  a  secretary/treasurer  (an
"Officer").  The title, extent of authority, term of office and compensation of
any Officer  shall be  determined by  the  Management  Committee  in  its  sole
discretion.

     5.2.      Tenure of  Officers.   The Officers  of the  Company shall  hold
office until  their successors  are chosen and qualify, unless a different term
is specified  by the  Management Committee  in appointing the Officer, or until
the Officer's earlier death, resignation or removal.  Any Officer chosen by the
Management Committee may be removed at any time by the Management Committee, in
its sole  discretion, and  any vacancy occurring in any office may be filled by
the Management  Committee, in  its sole  discretion.  Any Officer may resign by
delivering his or her written resignation to the Company at its principal place
of business.  Such resignation  shall be  effective upon  receipt unless  it is
specified to  be effective  at some  other time  or upon  the happening of some
other event.

                                  ARTICLE VI
         TRANSFER OF INTERESTS, WITHDRAWAL AND TERMINATION OF MEMBERS

     6.1.      Transfer or Withdrawal Prohibited; Change of Control of a Member

     (a)       Except as expressly provided herein, no Member may withdraw from
the Company  or sell, assign, transfer, pledge, hypothecate, mortgage or create
a security interest, directly or indirectly ("Transfer"), in all or any portion
of its  Interest without the prior written consent of the Management Committee,
which consent  may be  withheld in  the sole  and absolute  discretion  of  the
Management Committee.  Any purported withdrawal or Transfer of an Interest by a
Member without the requisite consent in writing shall be null and void, and the
Company shall  be entitled  to damages as a result of, and/or injunctive relief
with respect to, any attempts to withdraw or Transfer.

     (b)       In the  event  that  the  Management  Committee  consents  to  a
Transfer of  a Member's  Interest, such  consent shall, unless expressly stated
otherwise, be deemed a consent only to the assignment of such Member's economic
interest in profits, losses and distributions and shall not be deemed a consent
to the  admission of  such assignee  as a member of the Company as a substitute
for the  assignor, and  such assignee  shall not  have any  of the  rights of a
member of  the Company,  including, without  limitation, voting  rights, unless
otherwise stated  in writing by the Management Committee.  Except to the extent
that the Management Committee has consented to the admission of the assignee as
a member  in the  Company and/or  consented to the exercise of voting rights by
the assignee, the assigning Member shall retain all voting rights in connection
with the transferred Interest.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      16

<PAGE>
     (c)       In the  event that  at any time there occurs a Change of Control
(as  hereinafter   defined)  of   a  Member,   such  Member's   Interest  shall
automatically convert into an economic interest only in the profits, losses and
distributions of  the Company,  and such Member shall not have any other rights
of a member of the Company, including, without limitation, voting and marketing
rights.   For purposes  hereof, a  "Change in  Control" shall be deemed to have
occurred: (i)  on the  sale or other disposition of all or substantially all of
the Member's  assets to  any entity,  person or  related group of persons; (ii)
when there  shall be  consummated any  consolidation, merger, reorganization or
similar corporate  transaction (a "Corporate Transaction") of the Member (A) in
which the  Member is  not the  continuing or  surviving entity  (other  than  a
consolidation or  merger with  a wholly owned subsidiary of the Member in which
all shares  of common stock of such Member outstanding immediately prior to the
effectiveness thereof are changed into or exchanged for the same consideration)
or (B)  pursuant to  which the  common stock  of such Member would be converted
into cash,  securities or  other property, in each case, other than a Corporate
Transaction that  is a  Qualifying Corporate  Transaction (as  defined  below);
(iii)  when any person, or any persons acting together which would constitute a
"group" for  purposes of  Section 13(d) of the Securities Exchange Act of 1934,
as amended,  together with  any affiliates  thereof, shall beneficially own (as
defined in  Rule 13d-3 under the Exchange Act) at least 50% of the total voting
power of  all classes of capital stock of the Member entitled to vote generally
in the  election of directors of the Member (unless the "acquisition" is deemed
to have occurred indirectly solely as a result of the completion of a Corporate
Transaction that  is not  a Change  in Control  pursuant to clause (ii) above);
(iv)   when at any time during any consecutive two-year period, individuals who
at the  beginning of  such period  constituted the  Board of  Directors of  the
Member (together  with any  new directors  whose  election  by  such  Board  of
Directors or  whose nomination  for election  by the stockholders of the Member
was approved  by a  vote of  75% of the directors then still in office who were
either directors  at  the  beginning  of  such  period  or  whose  election  or
nomination for  election was  previously so  approved) cease  for any reason to
constitute a  majority of  the Board of Directors of the Member then in office;
or   (v)   when the  Member is  liquidated or  dissolved or  adopts a  plan  of
liquidation or  dissolution.  A "Qualifying Corporate Transaction" shall be any
Corporate Transaction  in which  the holders  of common  stock  of  the  Member
immediately prior  to such  Corporate Transaction have, directly or indirectly,
at least  (i) a  majority of  the total  voting power of all classes of capital
stock entitled to vote generally in the election of directors of the continuing
or  surviving   entity  immediately   after  such   Corporate  Transaction   in
substantially the  same proportion  as their  ownership of  common stock before
such transaction  or (ii)  25% of  the total  voting power  of all  classes  of
capital stock  entitled to  vote generally  in the election of directors of the
continuing or  surviving entity immediately after such Corporate Transaction in
substantially the  same proportion  as their  ownership of  common stock before
such transaction  and, in  the case  of this  clause (ii), the other Member has
given a  CIC Approval.   A "CIC Approval" shall be given by the other Member if
such Member  cannot conclude in good faith and in its reasonable judgment after
discussions with  the parties  to the Corporate Transaction that such Corporate
Transaction and  any resulting change in management or leadership is reasonably
likely to  disrupt or  delay the  commercialization of  products by the LLC, or
fundamentally alter  the approach,  philosophy or vision of the LLC, giving due
regard to  the importance  of  good-faith  cooperation  and  collaboration  and
single-mindedness of purpose between CYTOGEN and Progenics which has formed the
basis for  the collaboration  initially contemplated  by the parties hereto.  A
CIC Approval  may not be unreasonably withheld, and failure of the other Member
to give  a CIC  Approval may be contested in arbitration pursuant to Article 10
hereof.   Notwithstanding the  foregoing, a Change of Control shall not include
any transaction  the purpose  of which  is to reorganize the Member's corporate
structure, reincorporate  the Member  in another  jurisdiction or undertake any
other action  which does not have the purpose or effect of materially affecting
the ownership and/or control of the Member at the time of such transaction.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      17

<PAGE>
     6.2.      Regulatory Matters.  Anything in this Article VI or elsewhere in
this Agreement  to  the  contrary  notwithstanding,  no  assignment,  transfer,
encumbrance or  other disposition  of all  or any part of any Member's Interest
shall be  made or  shall be  effective unless  (a) prior  to  the  consummation
thereof, all  assignees and transferees with respect thereto shall have made to
the Company  in writing  all of  the representations required by the Management
Committee, to  ensure compliance  with applicable securities and other laws and
(b) if  required by  the Management  Committee, the Company is provided with an
opinion of  its legal  counsel, or  other legal  counsel  satisfactory  to  the
Company's counsel,  stating that (i) such assignment, transfer, encumbrances or
other disposition is exempt from the Securities Act of 1933, as amended, and is
permissible under  all other  applicable  federal  and  state  securities  laws
without registration  or qualification  of any  security or any person and (ii)
the transaction is not prohibited under, and does not conflict with, such other
federal or state laws as the Management Committee may specify.

     6.3.      Default; Buyout/Liquidation Option

     (a)       A Member  shall be  in default  ("Defaulting Member") under this
Agreement upon the occurrence of any of the following events ("Default"):

               (i)       the Bankruptcy (as defined hereinafter) or dissolution
of the Member (the Bankruptcy or dissolution of the Member shall hereinafter be
referred to as the "Dissolution"), in which event such Member shall immediately
notify the  other Member  ("Other Member")  and the  Company in  writing of the
occurrence of such Dissolution.

As used herein, the term "Bankruptcy" shall mean:

                    (1)       A Member files a voluntary petition in bankruptcy
or shall  be adjudicated a bankrupt or insolvent, or shall file any petition or
answer  or   consent  seeking  any  reorganization,  arrangement,  composition,
readjustment, liquidation  or similar  relief for  itself under  the present or
future  applicable   federal,  state  or  other  statute  or  law  relating  to
bankruptcy, insolvency or other relief for debtors, or shall seek or consent to
or acquiesce  in the  appointment of  any  trustee,  receiver,  conservator  or
liquidator of  said Member  of all or any substantial part of its properties or
its Interest  (the term  "acquiesce" as  used in  this definition  includes the
failure to file a petition or motion to vacate or discharge any order, judgment
or decree);

                    (2)       A  court  of  competent  jurisdiction  enters  an
order, judgment or decree approving a petition filed against any Member seeking
a  reorganization,   arrangement,   composition,   readjustment,   liquidation,
dissolution  or  similar  relief  under  the  present  or  any  future  federal
bankruptcy act,  or any  other present  or future  applicable federal, state or
other statute  or law  relating to  bankruptcy, insolvency  or other relief for
debtors, and  such Member  shall acquiesce in the entry of such order, judgment
or decree or such order, judgment or decree shall remain unvacated and unstayed
for an aggregate of 60 calendar days (whether or not consecutive) from the date
of entry  thereof, or  any trustee, receiver, conservator or liquidator of such
Member or  of all  or any  substantial part  of its  properties or its Interest
shall be appointed without the consent or acquiescence of such Member, and such
appointment shall remain unvacated and unstayed for an aggregate of 60 calendar
days (whether or not consecutive);

                    (3)       A Member  admits in  writing its inability to pay
its debts as they mature; or

                    (4)       A Member  makes an  assignment for the benefit of
creditors or  takes other  similar action  for the  protection  or  benefit  of
creditors.

               (ii)      the Member  has breached  in any material respect this
Agreement, the  PSMA/PSMP License  Agreement or  the Services  Agreement, which
breach has  not been  cured  within  60  calendar  days  after  the  Management
Committee or  non-breaching Member  has given a written notice to the breaching
Member stating  that a breach has occurred and identifying in reasonable detail
the relevant facts with respect to such breach.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      18

<PAGE>
               (iii)     on two  occasions, an  arbitrator  determines  that  a
Member has  acted in  bad faith  in refusing  to approve  a Budget  pursuant to
Section 2.4(b).

               (iv)      so long  as Progenics and CYTOGEN are the only Members
of the Company, the Member's Percentage falls below [*   *   *] ("Nonconforming
Percentage"), in  which event  (provided that  at such  time  as  any  Member's
Percentage shall  be reduced to zero, such Member shall cease to be a member in
the Company)  the Management  Committee shall immediately notify all Members in
writing of  the Nonconforming  Percentage.  Subsequently, any further reduction
in such  Member's Percentage  shall constitute  a separate Default again giving
rise to the options under Section 6.3(b) hereof.

The Management  Committee shall promptly (but in any event within five Business
Days) give notice (a "Default Notice") to the Members of any Default under this
Section 6.3(a)  of which  it becomes aware.  The Other Member shall be entitled
to give the Default Notice to the Defaulting Member on behalf of the Management
Committee.   In any  event, failure  to provide notice to the Defaulting Member
does not constitute a waiver of the default.

     (b)       Upon the  occurrence of  a Default and the giving of the Default
Notice, in  each case  as described in Section 6.3(a) hereof, (i) all marketing
rights held  by the Defaulting Party under Article IX hereof, and all rights of
Progenics (if Progenics is the Defaulting Party) under Section 2.2(d) hereof to
direct the  application of  the Progenics  R&D  Capital  Contributions  and  to
conduct the  research and  development program  contemplated  by  the  Services
Agreement, shall terminate and (ii) an option to purchase all but not less than
all of  the Interest  of the Defaulting Member shall arise immediately in favor
of the  Company and/or  the Other  Member.  The determination as to whether the
Company will  exercise the  purchase option  shall be made by the Other Member.
If the purchase option is not exercised within 45 calendar days from the giving
of the  Default Notice,  the Other  Member may,  but shall  not be required to,
within 90  calendar days  from the  giving of  the Default  Notice,  cause  the
Company to be dissolved and liquidated pursuant to Article VII hereof.

     (c)       The purchase  option arising  under Section 6.3(b) hereof may be
exercised only  by giving  a written  notice to  the Defaulting  Member of  the
election to  exercise such  purchase option  within the  45 calendar  day  time
period specified in Section 6.3(b) hereof (the "Exercise Notice").

     (d)       If the  Company and/or  the Other  Member exercises the purchase
option arising under Section 6.3(b) hereof, the purchase price determination of
the Defaulting  Member's Interest  shall first  be submitted  by the Management
Committee to  the Chief  Executive  Officer  of  each  Member  for  review  and
discussion.   Such persons  shall meet  as soon  as possible after the Exercise
Notice is  given, and  in any  event within  ten calendar days, and endeavor in
good faith  to determine  the purchase price.  If these officers do not, within
ten calendar  days after  they first meet, or within 20 calendar days after the
Exercise Notice  is given,  mutually  agree  upon  a  purchase  price  for  the
Defaulting Member's  Interest, either  Member may,  within the  30 calendar day
period following  such 20  calendar days after delivery of the Exercise Notice,
by written  notice given  to the  other Member within such 30 day period, cause
the purchase  price determination  of the  Defaulting Member's  Interest to  be
submitted to  arbitration pursuant  to Section  10.2 hereof.  In the event such
dispute is  submitted to  arbitration, the  purchase price  for the  Defaulting
Member's Interest  shall be  calculated by  the arbitrator  by multiplying  the
total entity  value of  the Company  (as determined  by the  arbitrator) by the
Defaulting Member's  Percentage.   In the  event the  Company and/or  the Other
Member exercises  the purchase  option, the Company and/or the Other Member and
the Defaulting  Member shall  be obligated  to consummate  the purchase  at the
purchase price determined in the manner described above.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      19

<PAGE>
     (e)       (i)       Subject  to   the  provisions  of  Section  6.3(e)(ii)
hereof, a  transfer of  Interests pursuant to this Section 6.3 shall take place
at a  closing to be held on a Business Day at least ten calendar days but prior
to 20  calendar days  after the  determination of  the purchase  price  of  the
Defaulting Member's  Interest pursuant  to Section  6.3(d) hereof,  which  date
shall be  determined by mutual agreement of the Members, or if no agreement can
be reached,  on a date unilaterally set by the Company and/or the Other Member,
at such  location in  New York, New York as the Company and/or the Other Member
selects or  as otherwise agreed to by the parties.  In the Exercise Notice, the
Company and/or the Other Member shall additionally specify whether the purchase
will be  by the Other Member, the Company, a combination of the Company and the
Other Member,  and/or the  designee(s) of the Company and/or the designee(s) of
the Other  Member (the  "Purchasing Party(ies)").  At the closing, the purchase
price specified  above shall  be paid  by the  Purchasing  Party(ies)  by  wire
transfer of immediately available federal funds to an account designated by the
Defaulting Member.   The  term of the purchase and sale shall be unconditional,
except that  the Defaulting  Member shall be deemed to represent and warrant to
the Purchasing Party(ies) that its Interest is subject to no legal or equitable
claims (other  than legal  or equitable claims to such Interest, if any, of the
Purchasing Party(ies)  pursuant to  this Agreement)  and shall  deliver at  the
closing  an  instrument  confirming  such  representation  and  warranty.    In
addition,  the  Purchasing  Party(ies)  shall  represent  and  warrant  to  the
Defaulting Member that it has the full right, power and authority to effectuate
the purchase  and upon  demand shall  deliver  at  the  closing  an  instrument
confirming such  representation and  warranty.   Upon the  sale of  a  Member's
Interest pursuant  to this  Section 6.3, the Member's appointed Representatives
shall be deemed to have automatically resigned from the Management Committee.

               (ii)      The closing date set forth in Section 6.3(e)(i) hereof
shall be postponed if any required regulatory filings have not been made or any
required consents or approvals (regulatory or otherwise) have not been received
by such  closing date,  but only  until such  filings have  been made  or  such
consents have been received and, if applicable, until the expiration or earlier
termination of  the applicable  waiting period  under the HSR Act.  The Members
hereby agree  to use  their reasonable  best efforts and to cooperate with each
other to effect any such required regulatory filings, including but not limited
to, a  filing under the HSR Act, if applicable, and to obtain any such required
consents or  approvals, in  order to  close a transfer of Interests pursuant to
this Section 6.3.

     (f)       The consummation  of any  purchase or sale of Interests pursuant
to this  Section 6.3  shall be subject to the satisfaction of the provisions of
Section 6.2 hereof.

     (g)       A Defaulting Member shall be liable to the Company and the Other
Member for  all damages  arising out  of a  Default and  any other  amounts the
Defaulting Member  owes to  the  Company  or  Other  Member  pursuant  to  this
Agreement or  any other  agreement, and  any such amounts may be offset against
any other  payments  otherwise  due  from  the  Purchasing  Party(ies)  to  the
Defaulting Member  hereunder.   Exercise or  failure to  exercise  any  of  the
options pursuant to this Section 6.3 shall not relieve the Defaulting Member of
the liabilities arising out of the Default.

                                  ARTICLE VII
            DISSOLUTION, LIQUIDATION AND TERMINATION OF THE COMPANY

     7.1.      Events of  Dissolution.   The Company  shall  be  dissolved  and
liquidated upon the first to occur of the following events:

     (a)       Upon the unanimous written consent of the Management Committee.

     (b)       Upon the  termination of  the Company's  business as a result of
the sale by the Company of all or substantially all of its business and assets.

     (c)       Upon the  Other Member's  exercise of  its right to dissolve and
liquidate the Company under Section 6.3 hereof.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      20

<PAGE>
     7.2.      Procedure for  Winding Up  and Dissolution.   If  the Company is
dissolved, the  Management Committee  shall wind up its affairs pursuant to the
appropriate provisions of the Act.  On winding up of the Company, the assets of
the Company shall be distributed in accordance with Section 3.8 hereof.

     7.3.      Termination of  Company.  Upon the completion of the liquidation
of' the  Company and  the distribution  of all  Company assets,  the  Company's
affairs shall  terminate and  the Management Committee shall execute and file a
certificate of  cancellation of  the Company's  Certificate, as well as any and
all other documents required to effect the termination of the Company under the
Act.

     7.4.      License Grants on Dissolution.  Upon dissolution of the Company,
each Member  (in each  case, the  "Grantee Member")  shall be  granted, at  its
request, by  the other  Member (the  "Grantor Member") a non-exclusive license,
with the right to sublicense, for use in the Field to any Intellectual Property
rights in which the Grantor Member has a licensable right ("Grantor Rights") to
the extent that the development and commercialization of any product or service
that includes  or embodies  a Company  Invention (including developing, making,
having made,  distributing, using,  offering for  sale, selling,  having  sold,
importing and  exporting such  products and  services) would  in the absence of
such non-exclusive  license, infringe  or conflict  with such  Grantor  Rights.
Royalties in  respect of  such non-exclusive  license shall  be payable at cost
(calculated as  described in  Section 5 of the PSMA/PSMP License Agreement, and
including any  milestone or  other payments required to be paid to any licensor
of the  Grantor Member  resulting from  the  development  or  commercialization
activities of  the Grantee  Member relating  to Company Inventions).  Such non-
exclusive licenses  shall contain  such  other  commercially  reasonable,  fair
market value terms as the parties shall in good faith agree.

                                 ARTICLE VIII
                 BOOKS, RECORDS, ACCOUNTING AND TAX ELECTIONS

     8.1.      Bank Accounts.  All funds of the Company shall be deposited in a
bank account  or accounts  opened  in  the  Company's  name.    The  Management
Committee shall determine the institution or institutions at which the accounts
will be  opened and  maintained, the types of accounts and the persons who will
have authority with respect to the accounts and the funds therein.

     8.2.      Fiscal Year.  Pursuant to Section 3.4 hereof, the Fiscal Year of
the Company for both accounting and tax purposes shall be the calendar year.

     8.3.      Method of  Accounting.   The  Company's  books  (for  accounting
purposes) shall  be maintained in accordance with generally accepted accounting
principles.   The determinations of the Management Committee or the Tax Matters
Partner, as  the case  may be, with respect to the treatment of any item or its
allocation for  federal, state  or local  income tax  purposes shall be binding
upon all  Members so  long as  that determination  is not inconsistent with any
express provision  of this  Agreement, provided that any determinations made by
the Tax Matters Partner are subject to the approval of CYTOGEN.

     8.4.      Books and  Records.   The books and records of the Company shall
be maintained  at the Company's expense under the supervision of the Management
Committee at  such office as the Management Committee shall approve, and may be
examined and  copied there by any Member or its duly authorized representatives
at reasonable  times and  upon reasonable notice.  The Company shall furnish to
each Member,  no later than 30 calendar days after the end of each of the first
three fiscal  quarters, quarterly  and year-to-date  statements of income and a
balance sheet as of the end of that quarter.  The Company shall furnish to each
Member, no  later than  45 calendar  days after  the end  of each  Fiscal Year,
financial statements  of the  Company with respect to that year prepared by the
Company's accountant  and audited  by  the  accounting  firm  selected  by  the
Management Committee.   The  Company will  seek to  engage the  services of  an
independent auditing firm as its independent auditor upon terms satisfactory to
the Company.   The  financial statements  shall include  a balance sheet of the
Company as  of the  end of  the Fiscal  Year,  a  statement  of  operations,  a
statement of  Members' Interests and a statement of changes in cash flow of the
Company for  the year.  The Company shall also furnish to each Member copies of
any additional  financial reports  delivered by  the Company to its lenders and
copies of all financial reports.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      21

<PAGE>
     8.5.      Tax Information.   Not  later than  the date  of delivery of the
annual financial  statements pursuant  to Section  8.4 hereof,  the  Management
Committee shall  cause the  Company's accountants to furnish to each Member any
information required  by that  Member to complete any income tax return that it
is required to file with respect to the year to which such financial statements
relate.   The Company  shall also  furnish tax information to the Members on an
interim basis to the extent the Management Committee determines appropriate.

                                  ARTICLE IX
                                MARKETING RIGHTS

     9.1.      Grant of  North American Marketing Rights.  Subject to the terms
and conditions  described herein,  the LLC  hereby grants  to CYTOGEN exclusive
marketing rights  with respect  to Licensed  Products sold in the United States
and Canada  (the "North  American Territory").   The exercise of such rights by
CYTOGEN is  conditioned on  CYTOGEN's  capability  to  perform  the  marketing,
detailing,  distribution   and  other   promotional  and   selling   activities
(hereinafter, "marketing  activities") required  to be  performed hereunder and
under the  Marketing Agreement  (as hereinafter  defined).   Such determination
shall take  into consideration CYTOGEN's ability to perform the necessary sales
and marketing  functions based  upon  an  assessment  of  its  existing  sales,
marketing and  distribution capabilities  compared to  those of other companies
promoting similar  products to  similar market  segments, as well as such other
factors as may be reasonably relevant.

     9.2.      Diligence Obligations.   CYTOGEN  shall use  diligent efforts to
market Licensed  Products in the North American Territory ("Diligent Efforts").
For purposes  of the foregoing, "Diligent Efforts" shall mean carrying out such
obligation in  a sustained  manner consistent  with the  efforts a  party would
devote to  a product of similar market potential, profit potential or strategic
value resulting from its own research efforts to which such party has exclusive
rights based  on conditions  then prevailing.   Diligent Efforts requires:  (i)
developing  a   strategic  plan   for  product  launch  and  subsequent  market
penetration with  defined objectives;  (ii) establishing  systems and protocols
reasonably designed  to achieve  such objectives;  (iii) allocating appropriate
resources to  support  such  systems  and  protocol;  (iv)  promptly  assigning
responsibility for  executing all  phases of  the Marketing  Plan  to  specific
employees  who   are  held   accountable   for   discharging   their   assigned
responsibilities; and  (v) monitoring  on an ongoing basis the execution of the
Marketing Plan  and its  success and  making such  changes as  are warranted by
market and/or  operational conditions.   CYTOGEN  shall provide  the  LLC  with
access to  all relevant records and personnel, during normal business hours and
with reasonable advance notice, under customary confidentiality conditions, for
the purpose  of determining  the utilization  by CYTOGEN of Diligent Efforts to
commercialize Licensed Products.

     9.3.      Assistance by Progenics; Contingent Grant of Rights.

     (a)       Subject to  the terms and conditions described herein, Progenics
shall be  entitled to  assist CYTOGEN,  under  the  direction  of  CYTOGEN,  in
connection  with  marketing  activities  regarding  Licensed  Products  in  any
territory (including  the North  American Territory)  in which CYTOGEN has been
granted or  is subsequently  granted marketing  rights pursuant  hereto.    The
assistance by  Progenics in  marketing activities  shall  be  conditioned  upon
Progenics' capability  to augment  in a  commercially  significant  manner  the
marketing activities  of CYTOGEN  (or any  other person  then  responsible  for
marketing Licensed  Products).   The nature  of  the  assistance  in  marketing
activities provided  by Progenics will be determined in good faith by Progenics
and CYTOGEN,  with the  approval of  the  LLC,  from  time  to  time  based  on
Progenics' capabilities.

     (b)       [*   *   *]

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      22

<PAGE>
     9.4.      Marketing Agreement.   The  LLC,  CYTOGEN  and  Progenics  shall
negotiate in  good faith  the terms  of  a  Product  Marketing  Agreement  (the
"Marketing Agreement")  to be  entered into  after the  completion of  Phase II
clinical trials  with respect to any Licensed Product.  The Marketing Agreement
shall be  based on  the terms  set forth in this Article IX, shall include, but
not be  limited to,  provisions  relating  to  marketing,  sales,  pricing  and
distribution  of   Licensed  Product  and  shall  further  define  the  rights,
responsibilities and obligations of the LLC, CYTOGEN and Progenics with respect
thereto.   No term  of the  Marketing Agreement  shall be  in conflict with any
material term  of this  Article IX without the written agreement of the parties
hereto.   Until the  terms of  the Marketing  Agreement are  agreed upon,  such
parties acknowledge  and agree  that the terms set forth in this Article IX are
fully binding  and enforceable.   The  Marketing Agreement  shall  include  the
following terms in addition to the other terms described above:

     (a)       At least  one year  in advance  of  the  anticipated  commercial
launch (as  determined in  good faith  by the  LLC) of each Licensed Product in
each country  in the  North American  Territory, CYTOGEN shall submit a plan (a
"Marketing Plan")  for approval   by the LLC for such commercial launch and the
subsequent period  of twelve  months plus  any subsequent  period prior  to the
start of  a calendar  year.   For each  calendar year thereafter, CYTOGEN shall
submit a  Marketing Plan  with respect to, and at least one year prior to, such
calendar year describing in reasonable detail the marketing activities for each
such Licensed  Product for  approval by  the LLC.   The  LLC's approval  of any
Marketing Plan  shall not  be unreasonably withheld.  Each Marketing Plan shall
include an overall level of anticipated product detailing, promotion, marketing
and sales  efforts regarding  the period covered thereby, a resource commitment
on the  part of  CYTOGEN with  respect thereto,  market and sales forecasts and
pricing analysis,  a monthly  budget and, with respect to commercial launch, an
estimated launch  date of  product marketing  and promotion  activities.   Each
Marketing  Plan  shall  also  include  the  general  operating  guidelines  and
strategies  for   targeting,  pricing  and  discounting  Licensed  Products  to
customers, a  detailed budget  for marketing  and distribution activities and a
forecast product line contribution statement for the applicable calendar year.

     (b)       The LLC  may from  time to time review with CYTOGEN such matters
regarding marketing  activities as  it reasonably requests.  CYTOGEN, Progenics
and the  LLC agree  to facilitate  communication and  cooperation between their
respective  organizations  in  order  to  maximize  the  success  of  marketing
activities.

     (c)       CYTOGEN  shall   develop  all   written  sales,   promotion  and
advertising materials relating to the commercialization of Licensed Products in
the North  American Territory.   The general form and content of such materials
shall be  subject to  annual approval  of the  LLC  and  general  and  specific
implementation by  CYTOGEN.   Ownership of  all names,  tradenames, trademarks,
service marks  and other  designations  of  Licensed  Products  (including  any
related registrations)  shall be  vested in the LLC.  In any given country, any
given Licensed  Product shall  be marketed  under only one tradename, except as
agreed to by the LLC.

     (d)       The LLC  shall be  responsible for  the cost of all advertising,
sales and promotion materials, market research and Phase IV studies ("Marketing
Materials") reasonably  incurred  in  connection  with  a  previously  approved
Marketing Plan.  The LLC will at all times own the Marketing Materials.

     (e)       The LLC  will have  responsibility  for  manufacturing  finished
packaged product, both for sale and for promotional samples.  The LLC will also
have responsibility  for manufacturing  clinical  supplies  for  any  Phase  IV
studies.   The LLC   will  purchase and  pay for  all raw (active and inactive)
materials and  packaging materials  (collectively,  "Manufacturing  Materials")
from third parties necessary to manufacture product.  The LLC will at all times
have title  to the  Manufacturing Materials,  work-in-process product and final
packaged product  (collectively, "Inventory")  until sale.   The LLC shall have
responsibility for  ensuring that  sufficient Inventory is available to satisfy
sales requirements pursuant to customer orders and for procuring and paying for
space to  warehouse Inventory.   The  LLC shall  have custodial  and managerial
responsibility for Inventory.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      23

<PAGE>
     (f)       CYTOGEN shall  be responsible for procuring order processing and
distribution  services   for  product.      CYTOGEN   shall   have   managerial
responsibility for  order processing,  including processing customer orders and
billing customers  for shipments  in satisfaction  of  their  orders,  and  for
product distribution,  including shipping  product in  satisfaction of customer
orders.

     (g)       The LLC  shall be  entitled to  inspect and  audit CYTOGEN's and
Progenics' books  and records  pertaining to  marketing activities  relating to
Licensed Products  for legitimate  business purposes under such terms as may be
set forth in the Marketing Agreement.

     9.5.      Negotiation Rights.

     (a)       In the  event that  the LLC  determines to  license, engage,  or
otherwise contract  with or  authorize a person other than the LLC to engage in
marketing activities  with respect to a Licensed Product in any territory other
than in  the North  American Territory,  the LLC  shall so  notify CYTOGEN  and
negotiate in  good faith  with CYTOGEN  the terms  of  an  agreement  regarding
marketing activities  with  respect  to  any  such  Licensed  Product  in  such
territory.   As a condition to any such negotiations, CYTOGEN shall demonstrate
to the  LLC's reasonable  satisfaction  CYTOGEN's  capability  to  perform  the
marketing activities  desired by the LLC in the relevant territory.  If CYTOGEN
is unable  to satisfy  such condition,  or if CYTOGEN does not desire to, or is
unable to  negotiate any  such agreement, or any such agreement is subsequently
terminated, the  LLC shall so notify Progenics and negotiate in good faith with
Progenics a marketing agreement as described above.  As a condition to any such
negotiations, Progenics  shall demonstrate to the LLC's reasonable satisfaction
Progenics' capability to perform the marketing activities desired by the LLC in
the relevant territory.  Any such determination as to the capability of CYTOGEN
or Progenics  shall take  into consideration  the relevant  party's ability  to
perform the necessary sales and marketing functions based upon an assessment of
such party's  existing sales,  marketing and distribution capabilities compared
to those  of other  companies promoting  similar  products  to  similar  market
segments, as well as such other factors as may be reasonably relevant.

     (b)       If CYTOGEN  elects not  to exercise  the marketing rights it has
been granted  under Section  9.1 hereof, or such rights are terminated pursuant
to this  Agreement or  the Marketing  Agreement, then  the LLC  shall so notify
Progenics, and  Progenics shall  be entitled to assume, on a prospective basis,
CYTOGEN's marketing  rights hereunder  and under the Marketing Agreement.  As a
condition to  any such assumption, Progenics must demonstrate to the reasonable
satisfaction  of  the  LLC  Progenics'  capability  to  perform  the  marketing
activities  required   to  be  performed  hereunder  and  under  the  Marketing
Agreement.  Such determination shall take into consideration Progenics' ability
to perform the necessary sales, marketing and distribution functions based upon
an assessment  of its  existing sales  and marketing  capabilities compared  to
those of other companies promoting similar products to similar market segments,
as well  as such  other factors  as may  be reasonably  relevant.  If Progenics
assumes  such   rights,  such   rights  shall  be  terminable  under  the  same
circumstances as such rights were terminable when held by CYTOGEN.

     9.6.      Marketing Compensation.  CYTOGEN and Progenics shall be entitled
to compensation  for marketing  activities conducted  pursuant hereto or to the
Marketing Agreement [*   *   *].  For purposes of this Section 9.6, [*   *   *]
as the case may be, as more specifically described in the Marketing Agreement.

     9.7.      Non-Transferability of  Rights.   The product  marketing  rights
granted by  the LLC  pursuant to  this Agreement  shall  not  be  transferable,
licensable or  otherwise exercisable  by any  person or  entity other  than the
party to which such rights have been granted hereby.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      24

<PAGE>
     9.8.      Termination of  Rights.   The  rights  granted  by  the  LLC  to
Progenics and  CYTOGEN in  Section 9.1  and 9.3  hereof  shall  be  subject  to
termination as follows:

        9.8.1.      Ownership Change.   In  the event that either Progenics' or
     CYTOGEN's Interest shall at any time be less than [*   *   *] of all then-
     outstanding Interests  (any such  party being  referred to  herein as  the
     "Diluted Party"),  the rights  granted to  the Diluted  Party pursuant  to
     Section 9.1  or  9.3  hereof,  as  the  case  may  be,  shall  immediately
     terminate.   In the  event that  the LLC  determines to  issue  additional
     ownership interests  to third-party investors, which issuance would result
     in substantial  dilution of Progenics's and CYTOGEN's ownership Interests,
     the parties hereto agree to negotiate in good faith the provisions of this
     Section 9.8.1 as  it relates  to any party that has not, prior to any such
     additional issuance of ownership interests, become a Diluted Party.

        9.8.2.      Breach.   In the  event that  either Progenics  or  CYTOGEN
     shall breach  any of  the material  representations or  warranties or  any
     material terms,  conditions or  agreements contained  herein made or to be
     kept, observed and performed by it, then each of the LLC and Progenics (in
     the event  of a breach by CYTOGEN) or CYTOGEN (in the event of a breach by
     Progenics), at  its sole  option and without prejudice to any of its other
     legal or  equitable rights  and remedies, may, by giving the other parties
     hereto 60 days' notice in writing, identifying with reasonable specificity
     the breach,  and unless (in the case of a breach of any term, condition or
     agreement) the  notified party  within such 60-day period shall have cured
     the breach,  terminate the  rights granted to Progenics or CYTOGEN, as the
     case may be, pursuant to Sections 9.1.

          9.8.3.    Diligence.   The LLC  may terminate  the rights  granted to
     CYTOGEN pursuant  to Section  9.1 hereof  as to  any Licensed Product (but
     only as to such Licensed Product) if CYTOGEN [*   *   *]

     9.9.      Retention of  Rights.   The parties hereto acknowledge and agree
that all  marketing rights  not expressly  granted by  the LLC  to  CYTOGEN  or
Progenics pursuant  to this  Article IX,  including without  limitation product
marketing rights  outside of  the North American Territory, are retained by the
LLC.  The LLC shall be entitled to retain or dispose of (by license, sublicense
or otherwise) any such rights in its sole discretion, and the proceeds, if any,
of any such disposition shall inure solely to the LLC.

                                   ARTICLE X
                              DISPUTE RESOLUTION

     10.1.     Escalation Procedure.   Except  as provided  in  Section  3.6(b)
hereof and  except for  any Deadlock  of the  Management Committee which is not
resolved  pursuant   to  Section  4.1(f)  hereof  (including  related  buy/sell
provisions in  Section 4.1(g)  hereof), all  disputes, controversies, claims or
differences between Progenics and CYTOGEN (any such event, a "Dispute") arising
out of  this Agreement,  its interpretation  or performance  by the  Members of
their respective  obligations hereunder,  including any questions regarding the
existence, validity  or termination  hereof, shall  be  resolved  as  described
below.  The Dispute shall first be submitted (the "First Notice of Dispute") to
the Chief  Executive Officer  of each of the Members for review and discussion.
Such persons  shall meet  as soon  as possible,  and in  any event  within  ten
calendar days  after the giving of the First Notice of Dispute, and endeavor in
good faith  to resolve  the matter.   If  these officers do not reach agreement
within ten  calendar days after they meet, or within 20 calendar days after the
First Notice  of Dispute  is given,  or otherwise  agree on  another method  of
resolving the  dispute, the  Dispute shall be resolved pursuant to Section 10.2
hereof.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      25

<PAGE>
     10.2.     Arbitration

     (a)       Either Member  may make  a demand  for binding  arbitration with
respect to  any dispute  arising hereunder by filing with the other a demand in
writing signed by an officer of the Member making such demand.

     (b)       The Members  may agree  on one arbitrator, but in the event they
cannot agree, there shall be three, one named in writing by each of the Members
within ten  Business Days  after demand  for arbitration  is given, and a third
chosen by  the two  appointed within ten Business Days after their appointment.
If the  two arbitrators  appointed by  the  Members  do  not  appoint  a  third
arbitrator within  such period, the American Arbitration Association ("AAA") in
New York,  New York  shall be retained to appoint a third arbitrator within ten
Business Days  after the  end of  such period.   Should either Member refuse or
neglect to  join in  the appointment  of the  arbitrator(s) or  to furnish  the
arbitrator(s) with  any papers  or information  demanded, the arbitrator(s) are
empowered to proceed ex parte.

     (c)       Arbitration shall  take place  in New  York, New  York (or  such
other location  as may  be agreed  between Progenics  and CYTOGEN)  at a single
hearing before the arbitrator(s) of the matter.  The arbitrator(s) shall select
such time  and place  promptly after  his/her (or  their) appointment, provided
that the  time scheduled  for the  hearing shall  not be later than 20 Business
Days after  the appointment of the last arbitrator(s).  The arbitrator(s) shall
give written  notice thereof to each Member at least ten Business Days prior to
the date  so fixed.   In the event a panel of three arbitrators is necessitated
by the Members' inability to agree upon a single arbitrator, such notice of the
time and  place of  the hearing  shall also  identify the  third member  of the
panel.   At the hearing, any relevant evidence may be offered by either Member,
and the  formal rules  of evidence applicable to judicial proceedings shall not
govern.   Evidence may  be admitted  or  excluded  in  the  discretion  of  the
arbitrator(s).  Said arbitrator(s) shall hear and determine the matter and such
determination  may   be  based   on  such  factors  and  consideration  as  the
arbitrator(s) deems  relevant and/or appropriate.  The arbitrator(s)' authority
shall be  limited to  determining the  issue  or  question  presented  in  each
instance and  shall not  extend to  any other  aspect of  this Agreement or the
parties' relationship  generally.   In addition,  the arbitrator(s)  shall  not
require the  LLC to pursue a particular research and development program unless
the general  elements thereof  have been  approved by the Management Committee.
The arbitrator(s)  shall execute  and acknowledge a binding decision in writing
setting forth  the basis  for their  decision in  reasonable detail and cause a
copy thereof to be delivered to each of the Members within ten Business Days of
the hearing date.

     (d)       The determination  of the  panel shall  be by majority vote with
each arbitrator  having a single vote.  The decision rendered by the arbitrator
(or the majority, if more than one) shall be final, and judgment may be entered
upon it  in accordance  with the  applicable law  in  any  court  of  competent
jurisdiction.

     (e)       Prior to  the scheduled hearing date, the Members shall agree on
procedures to  be used  in connection  with the arbitration.  To the extent the
Members cannot  agree upon  procedures, the  arbitration shall  be conducted in
accordance with  the Commercial Arbitration Rules of the AAA under the auspices
of the AAA.

     (f)       The costs  of such  arbitration shall  be borne  by the Company;
provided, however, that if the arbitrator(s) determines that one of the Members
acted in  bad faith in submitting the dispute to arbitration, such Member shall
bear all  costs and  expenses (including  the costs  and expenses  of the other
Member) in connection with the arbitration proceeding.

     10.3.     Injunctive Relief.    Notwithstanding  anything  herein  to  the
contrary, any  Member may  seek interim  or provisional relief in the form of a
temporary restraining  order, preliminary injunction or other interim equitable
relief concerning  any Dispute  in a court of competent jurisdiction; provided,
however, that,  once the  selection  of  the  arbitrator(s)  is  complete,  the
continuation,  termination,   amendment  or  modification  of  the  interim  or
provisional relief  shall be  determined by  the arbitrator(s)  and,  after  an
arbitration hearing  is commenced,  the action, suit or proceeding commenced in
such court seeking such interim or provisional relief shall be dismissed by the
stipulation of all Members.  In the event that the Members fail to stipulate to
the dismissal  of the  action, the  Members agree  that the  arbitrator(s)  may
submit a  stipulation dismissing the action.  The arbitrator(s) may conduct any
hearings or  order any  discovery they  deem necessary  to properly  review the
interim or  provisional relief.    This  Section  10.3  shall  be  specifically
enforceable by each Member.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      26

<PAGE>
                                  ARTICLE XI
                           MISCELLANEOUS PROVISIONS

     11.1.     Assurances.   Each Member  shall execute  all  certificates  and
other documents  and shall  do all such filing, recording, publishing and other
acts  as  the  Management  Committee  deems  appropriate  to  comply  with  the
requirements of  law for  the formation  and operation  of the  Company and  to
comply with  any laws,  rules and  regulations  relating  to  the  acquisition,
operation or holding of the property of the Company.

     11.2.     Disclaimer of  Agency.   This  Agreement  does  not  create  any
relationship beyond  the scope  set  forth  herein,  and  except  as  otherwise
expressly provided  herein, this  Agreement shall not constitute any Member the
legal representative or agent of the other, nor shall any Member have the right
or authority to assume, create or incur any liability or obligation, express or
implied, against,  in the  name of  or on  behalf of  any other  Member of  the
Company.

     11.3.     Entire Agreement; Amendment.  This Agreement contains a complete
statement of  the arrangements  among the  Members with  respect to the Company
supersedes all  prior agreements  and understandings among them with respect to
the Company and may not be amended except by unanimous written agreement of the
Members.

     11.4.     Notices.  Any notice or other communication under this Agreement
shall be  in writing  and shall be considered given when delivered in person or
sent by facsimile and acknowledged by a responsible person at the office of the
recipient, one  day after being sent by a major overnight courier, or four days
after being mailed by registered mail, return receipt requested, to the Members
at the addresses set forth below their names on the Schedule A hereto.

     11.5.     Counterparts.   The Members may execute this Agreement in two or
more counterparts, which shall, in the aggregate, be signed by all the Members.
Each counterpart  shall be  deemed an original instrument as against any Member
who has signed it.

     11.6.     Governing  Law.    This  Agreement  shall  be  governed  by  and
construed in  accordance with  the law  of the  State of Delaware applicable to
agreements made and to be performed in Delaware.

     11.7.     Binding  Effect.    This  Agreement  shall  be  binding  on  all
successors and  assigns of  the  Members  and  inure  to  the  benefit  of  the
respective permitted  successors and  assigns of  the Members,  except  to  the
extent of any express contrary provision in this Agreement.

     11.8.     Severability.   If any provision of this Agreement is invalid or
unenforceable, the  balance of  this Agreement shall remain in effect and shall
be enforceable  to the maximum extent permitted by law, and if any provision is
inapplicable to  any person  or  circumstance,  it  shall  nevertheless  remain
applicable to all other persons and circumstances.

     11.9.     Survival of Rights, Duties and Obligations.  Termination of this
Agreement for  any cause  shall not  release either  Member from  any liability
which at the time of termination has already accrued to the other Member hereto
or which  thereafter may accrue in respect of any act or omission prior to such
termination, nor  shall any  such termination  hereof affect  in  any  way  the
survival of  and right,  duty or obligation of either Member which is expressly
stated elsewhere in this Agreement to survive termination hereof.

     11.10.    Captions and  Exhibits.   Titles  or  captions  of  Sections  or
Articles contained  in  this  Agreement  are  inserted  only  as  a  matter  of
convenience and  for reference  and in no way define, limit, extend or describe
the scope of this Agreement or the intent of any provision hereof. All Exhibits
and Schedules attached hereto shall be considered a part hereof as though fully
set forth herein.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      27

<PAGE>
     11.11.    Specific Performance.   The  Members acknowledge  that  monetary
damages may not be an adequate remedy for violations of this Agreement and that
any Member  may, in its sole discretion, through arbitration or otherwise under
Article X  or, in  circumstances where Article X hereof is not applicable, in a
court of  competent jurisdiction,  apply for specific performance or injunctive
or other  relief as  such arbitrator or court may deem just and proper in order
to enforce  this Agreement  or to  prevent violation  hereof and, to the extent
permitted by applicable law, each Member waives any objection to the imposition
of such relief.

     11.12.    Assignability.   Except as  otherwise provided  in  Section  6.1
hereof, neither this Agreement nor any Interest, including the right to receive
distributions, shall be assignable by either Member without the written consent
of the  other, and  any attempted assignment without such consent shall be null
and void.   This  Agreement shall  be binding upon the successors and permitted
assigns of the Members. Any such successor or permitted assign shall be subject
to the same rights and obligations as the original Member hereunder.

     11.13.    Confidentiality

     (a)       As used  in this Section 11.13, "Confidential Information" means
all confidential  and proprietary business, technical, or financial information
relating to the matters discussed herein.

     (b)       In order  to protect  the Confidential Information of any Member
hereto (in such capacity, the "Disclosing Member") that has become available to
any other Member hereto (in such capacity, the "Receiving Member"), each Member
agrees as follows:

               (i)       Each Member  agrees that  it will  make no  use of any
Confidential Information  except in furtherance of the purposes contemplated by
this Agreement.

               (ii)      Each Member agrees that it will not, without the prior
written consent  of the  other Member, disclose to any third party Confidential
Information (which  for purposes  of this  Section 11.13(b)  shall include  the
terms or  existence of  this Agreement or of the PSMA/PSMP License Agreement or
the  Services   Agreement  or  other  matters  relating  to  the  collaboration
contemplated hereby  and thereby)  received in its capacity as Receiving Member
so long  as such  Member is  a member  of the  Company and for a period of five
years thereafter.

               (iii)     Notwithstanding the foregoing:

                    (1)       Each Member may disclose Confidential Information
                    to those  of  its  representatives,  employees  and  agents
                    ("Representatives")  who   have  a   need  to   know   such
                    Confidential  Information   in  relation   to  the  matters
                    discussed  herein   and  who   are  under   obligations  of
                    confidentiality and non-use consistent with those set forth
                    herein.     Any  unauthorized  disclosure  of  Confidential
                    Information by a Member's Representatives shall be a breach
                    by such Member of this Section 11.13.

                    (2)       Disclosure   of   Confidential   Information   is
                    permitted to  the extent  that such  disclosure is required
                    pursuant  to  applicable  laws,  rules  or  regulations  or
                    government requirement  or court  order, provided  however,
                    that  the   Receiving  Member  shall  promptly  notify  the
                    Disclosing Member in writing of the existence or imposition
                    of any  such requirement  or order  and cooperate  with the
                    Disclosing Member  in  seeking  an  appropriate  protective
                    order  or   other  reliable   assurance  that  confidential
                    treatment will be accorded the Confidential Information.

__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      28

<PAGE>
     (c)       The provisions  governing confidentiality  and non-use contained
in this Section 11.13 shall not apply to any Confidential Information which:

               (i)       the Receiving  Member can  establish was  known to the
                  Receiving Member  prior to  disclosure under or in connection
                  with this Agreement by the Disclosing Member;

               (ii)      was in  the public  domain or  the subject  of  public
                  knowledge at  the time  of disclosure  under or in connection
                  with this Agreement;

               (iii)     becomes part  of the  public domain  or the subject of
                  public knowledge  through no  breach by  or act of default of
                  the Receiving Member;

               (iv)      is obtained by the Receiving Member from a third party
                  other than  in breach of a legal or contractual obligation of
                  confidentiality owed  by such  third party  to the Disclosing
                  Member in  respect  thereof,  the  existence  of  which  such
                  obligation was  known  or  should  have  been  known  by  the
                  Receiving Member; or

               (v)       the Receiving  Member can  establish was independently
                  developed by it without reference to Confidential Information
                  received.

     (d)       Termination of  this Agreement  shall not affect the obligations
concerning confidentiality and non-use as set forth in this Section 11.13.

          IN WITNESS  WHEREOF, the parties hereto have signed this Agreement as
of the date first above written.

                              PROGENICS PHARMACEUTICALS, INC.


                              By:  /s/  Ronald J. Prentki
                              -------------------------------
                                Name:  Ronald J. Prentki
                                Title:  President


                              CYTOGEN CORPORATION


                              By:  /s/  Donald F. Crane
                              ------------------------------
                                Name:  Donald F. Crane
                                Title:  Vice President


                              PSMA DEVELOPMENT COMPANY LLC


                              By:  /s/  Ronald J. Prentki
                              ------------------------------
                                Representative


                              By:  /s/  Donald F. Crane
                              ------------------------------
                                Representative


__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

                                      29

<PAGE>
                                  SCHEDULE A

                               MEMBER PERCENTAGE





As of June 15, 1999


                                                    Addi-
                                Addi-              tional
 Members (Taxpayer   Initial   tional              Contri-   Adjusted
 Identification      Capital   Capital             bution    Capital   Percen-
 Number and          Contri-   Contri-   Percen-   Adjust-   Contri-   tage as
 Mailing Address)     bution   bution     tage      ment      bution   Adjusted
- ------------------   -------   -------   -------   -------   --------  --------

Progenics
 Pharmaceuticals,    $[* * *]             50.00%
 Inc.
Tax IDN 13-
 3379479
777 Old Saw Mill
 River Road
 Tarrytown, NY
 10591

CYTOGEN
 CORPORATION         $[* * *]             50.00%
Tax IDN 22-
 2322400
 600 College Road
 East
 CN5308
 Princeton, NJ
 08540

Total                $[* * *]            100.00%


__________________
*  *  *  Confidential  treatment  requested;  omitted  material  has been filed
         separately with the Commission.

<PAGE>
                                   EXHIBIT A

                           CERTIFICATE OF FORMATION

                                      OF

                         PSMA DEVELOPMENT COMPANY LLC


   Pursuant to Section 18-201 of the Delaware Limited Liability Company Act:

FIRST:    The name of the limited liability company is PSMA Development    Comp
          any LLC.

SECOND:   The address  of the registered office and the name and address of the
          registered agent  for service of process required to be maintained by
          Section 18-104 of the Delaware Limited Liability Company Act is:

          Corporation Service Company
          1013 Centre Road
          Wilmington, Delaware  19805


          IN WITNESS  WHEREOF, this  certificate has  been subscribed this 14th
day of  June, 1999,  by the  undersigned who  affirms that  the statements made
herein are true under the penalties of perjury.

                              By:___________________________
                                Name:
                                Title:



<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
This Schedule contains summary financial information extracted from the
Financial Statements of Progenics Pharmaceuticals, Inc. at June 30, 1999
and is qualified in its entirety by reference to such Financial
Statements.
</LEGEND>

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                      13,384,326
<SECURITIES>                                 9,455,931
<RECEIVABLES>                                1,700,218
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                            22,063,502
<PP&E>                                       2,865,886
<DEPRECIATION>                               1,697,894
<TOTAL-ASSETS>                              26,079,434
<CURRENT-LIABILITIES>                        2,108,010
<BONDS>                                              0
                                0
                                          0
<COMMON>                                        12,272
<OTHER-SE>                                  23,090,950
<TOTAL-LIABILITY-AND-EQUITY>                26,079,434
<SALES>                                         34,815
<TOTAL-REVENUES>                             5,910,758
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                             9,399,018
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              28,505
<INCOME-PRETAX>                             (3,516,765)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                (3,516,765)
<EPS-BASIC>                                    (0.37)
<EPS-DILUTED>                                    (0.37)


</TABLE>


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