CISTRON BIOTECHNOLOGY INC
10-Q, 1998-11-16
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<TABLE>

                     ----------------------------------
                     SECURITIES AND EXCHANGE COMMISSION
                          Washington, D.C. 20549
                     ----------------------------------

                                 FORM 10-Q

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

              For the Quarterly Period Ended September 30, 1998
              
                                      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 No. 0-15271


                         CISTRON BIOTECHNOLOGY, INC.
              (Exact Name of Registrant as Specified in its Charter)


        Delaware                                   22-2487972
(State or other jurisdiction of                (I.R.S. Employer
  incorporation or organization)                Identification Number)


 10 Bloomfield Avenue, Pine Brook, New Jersey           07058
(Address of Principal Executive Offices)              (Zip Code)

          Registrant's telephone number, including area code:
                              (973) 575-1700

	Indicate by check mark whether the Registrant (1) has filed all 
reports required to be filed by Section 13 and 15 (d) of the Securities 
Exchange Act of 1934 during the preceding 12 months and (2) has been 
subject to such filing requirements for the past 90 days.

                              Yes _X_ No ___

    The aggregate number of Registrant's outstanding shares on November 10,
1998 was 24,317,020 shares of Common Stock, .01 par value.

                            Page 1 of 13 pages
<PAGE> 2

                        CISTRON BIOTECHNOLOGY, INC.
                        ---------------------------
                       (A DEVELOPMENT STAGE COMPANY)
                        ---------------------------

                                  INDEX
                                  -----
										  	      	       
                                                                         PAGE

PART I  -  FINANCIAL INFORMATION

           Item 1. Financial Statements

           Balance sheets as of September 30, 1998 and June 30, 1998...    3

           Statements of operations for the three months ended 
           September 30, 1998 and 1997.................................    4

           Statements of cash flows for the three months ended 
           September 30, 1998 and 1997.................................    5

           Notes to financial statements...............................    6

           Item 2. Management's discussion and analysis of results of 
           operations and financial condition..........................    8

PART II - OTHER INFORMATION............................................   11

          Item 2. Changes in Securities................................   11

          Item 5. Other Information....................................   12

          Item 6. Exhibits and Report on Form 8-K......................   12

          Signatures...................................................   13

                                     -2-
<PAGE> 3

<CAPTION>
                           CISTRON BIOTECHNOLOGY, INC.
                           ---------------------------
                                 BALANCE SHEETS
                                 --------------

                                                    June 30,      September 30,
                                                      1998            1998
                                                   ------------   -------------
                                                                   (unaudited)
ASSETS
- ------
<S>
CURRENT ASSETS:                                    <C>             <C>
 Cash and equivalents                              $  5,832,031    $  5,597,609
 Accounts receivable-trade                              101,859          58,505
 Accounts receivable-other                            2,940,673       2,980,222
 Inventories                                              3,635           2,548
 Taxes receivable                                       329,024         329,024
 Notes receivable $230,000; reserve $230,000"                 -               -
                                                     ----------      ----------
TOTAL CURRENT ASSETS                                  9,207,222       8,967,908
						
ACCOUNTS RECEIVABLE - OTHER - Long Term               3,670,221       3,721,116
                                                     ----------      ----------
PROPERTY AND EQUIPMENT:
 Machinery and equipment                                502,908         502,908
 Furniture and fixtures                                 147,113         147,113
 Leasehold improvements                                  77,674          77,674
                                                        727,695         727,695
                                                     ----------      ----------
 Less: Accumulated depreciation                         701,477         702,736
                                                     ----------      ----------
                                                         26,218          24,959
                                                     ----------      ----------
SECURITY DEPOSITS                                        23,938          23,938
                                                     ----------      ----------
PATENTS, Net of accumulated amortization                                       
of $14,536 and $15,198, respectively                     22,569          21,907
DEFERRED TAX ASSET                                       49,313          49,313
TOTAL ASSETS                                       $ 12,999,481    $ 12,809,141
                                                     ==========      ==========
LIABILITIES AND SHAREHOLDERS' EQUITY                                     
- ------------------------------------                                         
CURRENT LIABILITIES:						
 Accrued expenses and accounts payable             $    114,894    $     71,637
 Taxes payable                                          348,898         284,718
 Other current liabilities                              691,058         700,352
                                                     ----------      ----------
TOTAL CURRENT LIABILITIES                             1,154,850       1,056,707
                                                     ----------      ----------
 Other non-current liabilities                          902,174         914,693
                                                     ----------      ----------
SHAREHOLDERS' EQUITY:
 Common stock, $.01 par value; 50,000,000 shares
 authorized; issued and outstanding 26,930,187
 shares in each period                                  269,302         269,302
 Additional paid-in capital                           8,683,680       8,683,680
 Earnings accumulated during the development stage    2,384,125       2,279,409
 Treasury stock 3,946,500 shares at cost               (394,650)       (394,650)
                                                     ----------      ----------
TOTAL SHAREHOLDERS' EQUITY                           10,942,457      10,837,741
                                                     ----------      ----------
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY         $ 12,999,481    $ 12,809,141
                                                     ==========      ==========
						
                     See accompanying notes to financial statements. 

                                        -3-
</TABLE>
<PAGE> 4
<TABLE>
<CAPTION>
                                CISTRON BIOTECHNOLOGY, INC.
                                ---------------------------
                                 STATEMENTS OF OPERATIONS
                                 ------------------------
                                        (UNAUDITED)
                                                                               February 2, 1982
                                                                               (commencement of
                                             Three Months ended September 30,   operations) to
                                                   1997              1998      September 30, 1998
                                             ----------------------------------------------------
<S>                                           <C>              <C>               <C>
Sales.......................................  $    175,290     $    153,570      $  9,568,555
Cost of sales...............................        81,315           79,634         4,196,963
                                                ----------       ----------        ----------
       Gross profit.........................        93,975           73,936         5,371,592
Other income:
  Litigation settlements....................             -                -        14,684,206 
  License fees and funded research..........       100,000                -         4,111,149
Expenses:                                                           
  Research and development..................        98,420          103,661         8,647,007
  Administrative and marketing..............       319,393          225,669        11,432,731
  Occupancy.................................        46,122           50,213         2,521,178
                                                ----------       ----------        ----------
Total expenses..............................       463,935          379,543        22,600,916
       Operating income (loss)..............      (269,960)        (305,607)        1,566,031
Interest income/(expense) - net.............       138,282          136,711         1,017,275
Other expense...............................             -                -            59,895
Amortization of deferred financing costs....             -                -           173,079
Acquisition expense.........................             -                -           429,620
                                                ----------       ----------        ----------
Income (loss) before income taxes
 and extraordinary credit...................      (131,678)        (168,896)        1,920,712
Income tax provision (benefit)..............       (63,338)         (64,180)        1,403,619
                                                ----------       ----------        ----------
Income/(loss) before extraordinary credit...       (68,340)        (104,716)          517,093
Extraordinary credit - benefit of tax loss                            
  carryforward..............................             -                -           262,838
                                                ----------       ----------        ----------
       Net income/(loss)....................  $    (68,340)    $   (104,716)     $    779,931
                                                ==========       ==========        ==========
Net loss per share..........................  $          -     $          -   
Weighted average shares outstanding.........    26,884,990       22,983,687
                                                ==========       ==========
Net income/(loss) per share -                                               
 assuming dilution..........................  $          -     $          -
                                                ==========       ==========
Weighted average shares outstanding                                  
 assuming dilution..........................    26,884,990       22,983,687 
                                                ==========       ==========         

                            See accompanying notes to financial statements
                                                -4-
</TABLE>
<PAGE>  5
<TABLE>
<CAPTION>
                                      CISTRON BIOTECHNOLOGY, INC.
                                      ---------------------------
                                       STATEMENTS OF CASH FLOWS
                                       ------------------------
                                              (UNAUDITED)
                                              -----------
                                                                                         February 2, 1982
                                                                                         (commencement of
                                                     Three Months ended September 30,     operations) to
                                                            1997              1998       September 30, 1998
                                                     ------------------------------------------------------
<S>                                                  <C>                <C>               <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
 Cash received from customers                         $    190,323      $    199,319      $  11,454,013
 Cash paid to suppliers and employees                   (1,112,103)         (504,529)       (31,623,299)
 Interest received                                          69,655            68,080            674,137
 Acquisition expenses paid                                       -                 -           (429,620)
 Royalties, research funding, license fees received        100,000                 -          2,677,987
 Other receipts                                                 82             2,708         15,140,256
                                                        ----------        ----------        -----------
  Net cash provided by (used in) operating activities     (752,043)         (234,422)        (2,106,526)
                                                        ----------        ----------        -----------
CASH FLOWS FROM INVESTING ACTIVITIES:
 Collection of note receivable                                   -                 -             15,097
 Issuance of note receivable                                     -                 -           (230,000)
 Purchase of property and equipment                              -                 -           (762,472)
                                                        ----------        ----------        -----------
  Net cash (used in) investing activities                        -                 -           (977,375)
                                                        ----------        ----------        -----------
CASH FLOWS FROM FINANCING ACTIVITIES:
 Proceeds from issuance of capital stock and
  additional contributions                                       -                 -          9,946,398
 Principal payments on notes payable                             -                 -           (870,238)
                                                        ----------        ----------        -----------
 Purchase of treasury stock                                      -                 -           (394,650)
                                                        ----------        ----------        -----------
  Net cash provided by financing activities                      -                 -          8,681,510
                                                        ----------        ----------        -----------
  Net change in cash and cash equivalents                 (752,043)         (234,422)         5,597,609
CASH AND CASH EQUIVALENTS, beginning of period           6,368,228         5,832,031                 -
                                                        ----------        ----------        -----------
CASH AND CASH EQUIVALENTS, end of period              $  5,616,185      $  5,597,609      $   5,597,609
                                                        ==========        ==========        ===========
RECONCILIATION OF NET INCOME (LOSS) TO NET CASH
PROVIDED BY (USED IN) OPERATING ACTIVITIES:
  Net income (loss)                                   $    (68,340)     $   (104,716)     $     779,931
  Adjustments to reconcile net income (loss) to net
   cash provided by (used in) operating activities:
  Depreciation and amortization                              1,976             1,921            744,786
  Issuance of warrants                                      65,000                 -             65,000
  Deferred income taxes                                    (77,163)                -            (49,313)
  Loss on disposal of property and equipment                 4,552                 -              8,531
  Increase in reserve for note receivable                        -                 -            230,000
  Amortization of deferred financing costs and other             -                 -            195,179
  Decrease (increase) in assets:
   Accounts receivable                                      12,257            43,354            (58,505)
   Inventory                                                 1,115             1,087             (2,548)
   Taxes receivable                                              -                 -           (329,024)
   Notes and other long-term receivables                   (90,440)          (90,444)        (6,717,038)
   Security Deposits                                             -                 -            (23,938)
   Intangible assets                                             -                 -            (37,105)
  Increase (decrease) in liabilities:
   Accounts payable and accrued expenses                  (576,638)          (43,257)         1,536,653
  Other current and non-current liabilities                (24,362)          (42,367)         1,550,865
                                                        ----------        ----------        -----------
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES:  $   (752,043)     $   (234,422)     $  (2,106,526)
                                                        ==========        ==========        ===========

                                 See accompanying notes to financial statements

                                                       -5-
</TABLE>
<PAGE> 6


                            CISTRON BIOTECHNOLOGY, INC.
                            ---------------------------
                           NOTES TO FINANCIAL STATEMENTS
                                   (Unaudited)


A. BASIS OF PRESENTATION
   ---------------------

   The financial statements for the periods ended September 30, 1998 and 
1997 have been prepared without audit and, in the opinion of management, 
all adjustments (which include only  normal recurring adjustments) 
necessary to fairly present the Company's financial position, results of 
operations, and cash flows at September 30, 1998 and 1997 and for the 
periods then ended have been made.

   Certain information and footnote disclosures normally included in 
financial statements prepared in accordance with generally accepted 
accounting principles have been omitted.  These financial statements 
should be read in conjunction with the financial statements and notes 
thereto included in the Company's Annual Report on Form 10-K for the 
fiscal year ended June 30, 1998.  The results of operations for the 
periods ended September 30, 1998 and 1997 are not necessarily indicative 
of the operating results for the full year.

B. OTHER INCOME
   ------------

   During the three-month period ended September 30, 1997, the Company
received non-refundable research and development funding of $100,000 
representing the ninth of 10 consecutive quarterly research and 
development payments of $100,000 which another company had agreed to 
make to Cistron.

C. INCOME TAXES
   ------------

   Tax benefits of $63,338 and $64,180 were recorded in the three-month 
periods ended September 30, 1997 and 1998, respectively, against the net 
losses incurred.

D. ACCOUNTS RECEIVABLE 
   -------------------

   Accounts receivable - other consists of amounts due in November 1998 
(current) and amounts due in November 1999 and 2000 (long term) pursuant 
to a litigation settlement agreement entered into in 1996.  Long-term 
amounts have been discounted to reflect their present value.

E. CHANGES IN SHAREHOLDERS' EQUITY
   -------------------------------

   During the three-month period ended September 30, 1997, shareholders' 
equity decreased by a net loss of  $68,340 which was partially offset by 
a $65,000 increase in additional paid-in capital as the result of 
recording the value of warrants issued to third parties.  During the 
three-month period ended September 30, 1998, shareholders' equity 
decreased due to a net loss of $104,716.

                                  -6-
<PAGE> 7

F. EARNINGS PER SHARE CALCULATIONS 
   -------------------------------

   In February 1997, The Financial Accounting Standards Board issued 
Statement of Accounting Standards ("SFAS") No. 128, "Earnings Per 
Share".  SFAS No. 128 specifies the computation, presentation and 
disclosure requirements for earnings per share ("EPS") and became 
effective for both interim and annual periods ending after December 15, 
1997.  All prior period EPS data has been restated to conform with the 
provisions of SFAS No. 128.  The following is a reconciliation of the 
numerators and denominators used to calculate Earnings per Share: 

<TABLE>
<CAPTION>
                                              Three Months Ended
                                                 September 30, 
                                           1997               1998
                                     --------------------------------
<S>                                  <C>                <C>
Earnings per common share:
- ------------------------------
 Net income (loss) (numerator)       $    (68,340)      $   (104,716)
 Weighted average shares
  (denominator)                        26,884,990         22,983,687
Income (loss) per share              $          -       $          -
                                       ==========         ==========

Earnings per common share - 
 assuming dilution:
- -----------------------------

Net income (loss) (numerator)        $    (68,340)      $   (104,716)
Weighted average shares                26,884,990         22,983,687
Effect of dilutive options                      -                  -
                                       ==========         ==========

Weighted average shares - 
  assuming dilution (denominator)      26,884,990         22,983,687

Income (loss) per share              $          -       $          -
                                       ==========         ==========
</TABLE>

G. NEW ACCOUNTING PRONOUNCEMENT
   ----------------------------

   In June 1997, the Financial Accounting Standards Board issued Statement 
of Financial Accounting Standards No. 131, "Disclosures About Segments 
of an Enterprise and Related Information."  This Statement became 
effective for the Company during the current year.  The Company is 
currently in compliance with this accounting pronouncement.

                                 -7-
<PAGE>  8


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

        The following discussion should be read in conjunction with and is 
qualified in its entirety by the accompanying financial information and 
notes thereto, and management's discussion and analysis of results of 
operations and financial condition contained in the Company's Annual Report 
on Form 10-K for the fiscal year ended June 30, 1998.

        Certain statements in this discussion and analysis constitute forward-
looking statements, are not historical facts, and involve risks and 
uncertainties that could cause actual results to differ from those expected 
and projected.  Such risks and uncertainties include but are not limited 
to: (i) general economic conditions; (ii) conditions specific to the 
biotechnology industry; (iii) the Company's ability to develop or acquire 
new technology or products through licensing, merger or acquisition and to 
obtain regulatory approval to commercialize diagnostic or therapeutic 
products; (iv) the effectiveness and ultimate market acceptance of any such 
products; (v) limitations on third party reimbursements with respect to any 
such products; and (vi) competition.  The Company does not undertake to 
update or revise any forward-looking statements contained herein whether as 
a result of new information, future events or otherwise.

Results of Operations
- ---------------------
        The Company sells its products to the research market and has not
generated significant revenues therefrom.  None of its products have been
submitted to or received approval from the Food and Drug Administration for
the sale of such products to the diagnostic or therapeutic markets.

        The Company believes it is a development stage enterprise because
planned principal operations have not yet commenced.  The Company's planned 
principal operations include the development of clinical and therapeutic 
products for distribution through pharmaceutical and diagnostic companies.  
This requires the approval of the Company's products by the Food and Drug 
Administration ("FDA").  At September 30, 1998, none of the Company's 
products had received such approval.  In addition, the Company continues to 
devote most of its efforts to activities such as research and development, 
financial planning and developing markets which are typical activities for 
a development stage enterprise.  Specifically, the Company has expended 
funds relating to the dental assay and vaccine adjuvant programs.  With 
respect to financial planning, from September 1997 to September 1998, the 
Company engaged the services of BlueStone Capital Partners, LP 
("Bluestone") to act as Cistron's financial advisor as to corporate 
strategic and financial initiatives.  In October 1998, the Company engaged 
Genome Securities, Inc. to act in this capacity.  Accordingly, as the 
Company has not yet commenced principal operations and is devoting most of 
its efforts to activities typical of a development stage enterprise as 
outlined in Statement of Financial Accounting Standards No.7, the Company 
believes that it continues to be in the development stage.

                                -8-
<PAGE> 9

Three Months Ended September 30, 1998 and Three Months Ended September 30, 1997
- -------------------------------------------------------------------------------

        Sales decreased $21,720 (12.4%) in the quarter ended September 30, 1998
versus the same period of the prior year due to decreased bulk cytokine 
assay kit components offset, in part, by increased bulk cytokine protein 
sales.  While customers may vary, Cistron's product sales are usually 
concentrated among a limited number of customers.  In the quarter ended 
September 30, 1997, two customers accounted for approximately 65% of sales 
while in the quarter ended September 30, 1998, three customers accounted 
for approximately 60% of sales.  Export sales decreased $35,975 (55.0%) 
primarily due to decreased bulk assay kit component sales.  Domestic sales 
increased $14,255 (13.0%) due to increased protein sales, offset, in part, 
by lower bulk assay kit component sales.

        Cost of sales decreased $1,681 (2.1%) from the prior year due to the
lower sales volume, offset, in part, by increased manufacturing salary expense.

        During the quarter ended September 30, 1997, the Company received non-
refundable research and development funding of $100,000, representing the 
ninth of 10 consecutive quarterly research and development payments of 
$100,000 which another company had agreed to make to Cistron. 

        Operating expenses decreased $84,392 (18.2%) in the quarter ended
September 30, 1998 versus the same quarter of the prior year.  Research and 
development expenses increased $5,241 (5.3%) due to higher external 
research funding for vaccine adjuvant studies, offset, by lower research 
salary and consulting expenses.  

        Administrative and marketing expenses decreased $93,724 (29.3%)
primarily due to lower consulting expenses in the quarter ended September 30,
1998 as compared to last year's quarter, in which BlueStone Capital Partners,
LP were engaged and $65,000 was charged as non-cash compensation related to 
the issuance of an initial warrant to purchase 400,000 shares.  Occupancy 
expenses increased $4,091 (8.9%) as the result of higher utility expenses 
incurred in the quarter ended September 30, 1998 than in the same quarter 
of the previous year.

        Interest income of $68,080 was earned on the investment of higher cash
balances.  In addition, net interest income of $68,631 was recognized on 
accounts receivable-other and other non-current liabilities to reflect the 
increase in their present value.

        The Company had an operating loss of $305,607 in the quarter and there
can be no assurance that its operations will reach profitability.

                                    -9-
<PAGE> 10

Liquidity and Capital Resources
- -------------------------------

        At September 30, 1998, the Company had current assets of $8,967,908 
including cash and cash equivalents of $5,597,609 and had current 
liabilities of $1,056,707.  Cash used in the quarter ended September 30, 
1998 was largely for operating expenses.

        In September 1997, the Company engaged the services of BlueStone
Capital Partners, LP to act as Cistron's financial advisor as to corporate 
strategic and financial initiatives. The Company's agreement with BlueStone 
was not renewed at its expiration in September 1998.  In October 1998, 
Cistron engaged Genome Securities, Inc., whose Chairman and CEO, Robert 
Naismith, Ph. D. is also a member of the Company's Board of Directors, to 
perform these services.  In this regard, the Company has held exploratory 
discussions with several biotechnology and pharmaceutical companies 
regarding possible strategic alliances including joint ventures, mergers or 
the sale of the Company.   There can be no assurances that any of these 
discussions will result in any agreements with the Company.

        On June 30, 1998, Cistron and Pasteur Merieux Serums & Vaccins, S.A. 
(PMS&V), the world's largest vaccine company, entered into a letter of 
intent for an option and license agreement pertaining to the use of IL-1 as 
a vaccine adjuvant in the fields of preventive and therapeutic vaccines.  
On October 30, 1998, PMS&V purchased 1,333,333 shares of Cistron common 
stock at approximately $.75 per share and received warrants to purchase 
666,667 additional shares at $.25 per share, for an aggregate price of 
$1,000,000.  BlueStone Capital is entitled to a fee from Cistron of 7% of 
this transaction and to receive an additional warrant to purchase 400,000 
shares of common stock at $.25 per share.

        Simultaneously, the parties also entered into an option and
collaboration agreement, under which PMS&V obtained a three-year option to
acquire an exclusive license to use Cistron's interleukin-1 beta technology
in the fields of therapeutic and preventive vaccines.  Under that agreement,
PMS&V also agreed to fund Cistron's vaccine adjuvant development program over
the three-year period for $900,000.  The agreement contemplates that PMS&V
will conduct its own preclinical and clinical work on the use of IL-1 beta as
a vaccine adjuvant in these fields.  

        If the option is exercised, Cistron could receive an aggregate of $31 
million in milestone payments based upon the development progress of 
adjuvanted vaccine products using Cistron's IL-1 beta technology or joint 
technology developed by the parties, through clinical trials and FDA 
approvals, provided PMS&V exercises all its rights under the agreement and 
subject to completion of the development program as currently contemplated.  
Cistron would also receive royalties should PMS&V sell vaccines using that 
technology.

        There can be no assurance that PMS&V will exercise its option to
license IL-1 adjuvant rights or if they do, that product development milestones
will be achieved.

        Management believes that it will have sufficient assets to fund the 
Company's current programs and plans through fiscal 1999 and beyond. 

                                   -10-
<PAGE> 11


PART II - OTHER INFORMATION
- ---------------------------

Item 1.	Legal Proceedings
        -----------------
        Not applicable.


Item 2.	Changes in Securities
        ---------------------
        a.  Not applicable.

        b.  Not applicable.

        c.  On October 30, 1998, the Company issued and sold to Pasteur 
        Merieux Serums & Vaccins, S.A. ("PMS&V") 1,333,333 shares of Common 
        Stock of the Company (the "Common Stock") and a warrant to purchase 
        666,667 shares of Common Stock at an exercise price of $.25 per 
        share, for an aggregate consideration of $1,000,000, under the terms 
        of a Common Stock and Warrant Purchase Agreement dated as of October 
        30, 1998 between the Company and PMS&V.  The shares of Common Stock 
        and the warrant were purchased for investment and the issuance of 
        those securities was exempt from the registration requirements of 
        the Securities Act of 1933, as amended, by virtue of Section 4(2) 
        thereof and Rule 506 thereunder. The certificate representing the 
        shares of Common Stock and the warrant were appropriately legended 
        to reflect that they have not been registered under said Act. 
        On October 30, 1998, at partial compensation for the financial 
        advisory services of BlueStone Capital Partners, L.P. ("BlueStone"), 
        on the transactions described in the preceding paragraph, the 
        Company issued to BlueStone's designee, Robert Naismith, Ph.D. (a 
        former Managing Director of BlueStone), a warrant to purchase 
        400,000 shares of Common Stock at an exercise price of $.25 per 
        share.  The warrant was purchased for investment and the issuance of 
        the warrant was exempt from the registration requirements of the 
        Securities Act of 1933, as amended, by virtue of Section 4(2) 
        thereof.  The warrant was appropriately legended to reflect that 
        neither it nor the shares of Common Stock issuable upon exercise of 
        the warrant have been registered under said Act.


Item 3.	Defaults upon Senior Securities
        -------------------------------
        Not applicable.


Item 4.	Submission of Matters to a Vote of Security Holders
        ---------------------------------------------------
	Not applicable.

                                   -11-
<PAGE> 12

Item 5.	Other Information
        ----------------- 
        On October 30, 1998, PMS&V purchased 1,333,333 shares of Cistron 
        common stock at approximately $.75 per share and received warrants 
        to purchase 666,667 additional shares at $.25 per share, for an 
        aggregate price of $1,000,000. PMS&V was granted demand and 
        piggyback registration rights with certain priorities (i.e. PMS&V 
        will be included in the registration of a potential future offering 
        of other securities of the Company).

        Simultaneously, the parties also entered into an option and 
        collaboration agreement, under which PMS&V obtained a three-year 
        option to acquire an exclusive license to use Cistron's interleukin-
        1 beta technology in the fields of therapeutic and preventive 
        vaccines.  Under that agreement, PMS&V also agreed to fund Cistron's 
        vaccine adjuvant development program over the three-year period for 
        $900,000.  The agreement contemplates that PMS&V will conduct its 
        own preclinical and clinical work on the use of IL-1 beta as a 
        vaccine adjuvant in these fields.  

        If the option is exercised, Cistron could receive an aggregate of 
        $31 million in milestone payments based upon the development 
        progress of adjuvanted vaccine products using Cistron's IL-1 beta 
        technology or joint technology developed by the parties, through 
        clinical trials and FDA approvals, provided PMS&V exercises all its 
        rights under the agreement and subject to completion of the 
        development program as currently contemplated.  Cistron would also 
        receive royalties should PMS&V sell vaccines using that technology.


Item 6.	Exhibits and Reports on Form 8-K
        --------------------------------
        a.  Exhibit.     

            4.1  Common Stock Purchase Warrant of Registrant issued 
                 to Kirkland & Ellis LLP to purchase 250,000 shares 
                 of Common Stock.

            4.1a Amendment to Common Stock Purchase Warrant of 
                 Registrant issued to Kirkland & Ellis LLP to 
                 purchase 250,000 shares of Common Stock.

            4.2  Common Stock Purchase Warrant of Registrant issued
                 to BlueStone Capital Partners, L.P. to purchase
                 400,000 shares of Common Stock.

            4.3  Common Stock and Warrant Purchase Agreement pursuant 
                 to which Pasteur Merieux Serums & Vaccins, S.A. 
                 purchased 1,333,333 shares of Common Stock and a 
                 warrant to purchase 666,667 shares of Common Stock.

            4.4  Registration Rights Agreement between Registrant and 
                 Pasteur Merieux Serums & Vaccins, S.A.

            4.5  Common Stock Purchase Warrant of Registrant issued 
                 to Robert Naismith, Ph.D. to purchase 400,000 shares 
                 of Common Stock.

                                         -2-
<PAGE> 13

           10.18 Collaboration and Option Agreement between 
                 Registrant and Pasteur Merieux Serums & Vaccins, S.A.
                 + Portions have been omitted and filed separately
                 with the Securities and Exchange Commission pursuant to a
                 request for confidential treatment.

           10.19 Letter of engagement, dated October 5, 1998, between 
                 Registrant and Genome Securities, Inc.

           27.   Financial Data Schedule

        b.  Reports on Form 8-K.  Not applicable.


                            _________________________

                                   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.


Date: November 10, 1998                 CISTRON BIOTECHNOLOGY, INC.


                                        BRUCE C. GALTON
                                        ----------------
                                        Bruce C. Galton
                                        Chairman & CEO, 
                                        Chief Financial Officer and 
                                        Treasurer
                                        (Principal Financial and
                                          Accounting Officer)

                                     -13-


<PAGE> 1

Void after 5:00 P.M.                   Common Stock Warrant
New York Time                          To Purchase 250,000 Shares
December 5, 2000                       Of Common Stock of Cistron
                                       Biotechnology, Inc.

                                                No. 1

                            CISTRON BIOTECHNOLOGY, INC.
                       1.1.  Common Stock Purchase Warrant
                              __________________

                This Warrant and the shares of Common Stock issuable upon 
        exercise of this Warrant have not been registered under the 
        Securities Act of 1933, as amended (the "Act"), and may not be 
        sold or otherwise disposed of except (a) to a person who, in the 
        opinion of counsel reasonably acceptable to the Company, is a 
        person to whom the securities may be legally transferred without 
        registration and without delivery of a current prospectus under 
        the Act or (b) to a person upon delivery of a prospectus or 
        offering circular then meeting the requirements of the Act 
        relating to such securities and the offering thereof for such 
        sale or disposition.
                              __________________

        This certifies that, FOR VALUE RECEIVED, KIRKLAND & ELLIS or registered
assigns (the "Holder"), is entitled to purchase, subject to the provisions of
this Warrant, from CISTRON BIOTECHNOLOGY, INC., a Delaware corporation (the
"Company"), 250,000 shares of the Company's common stock, $.01 par value (the
"Common Stock"), at a price of $.50 per share at any time prior to 5:00 P.M.,
New York Time, on December 5, 2000, at which time this Warrant shall expire
and become void.  The number of shares of Common Stock to be received upon
exercise of this Warrant and the price to be paid for each share of Common
Stock are subject to possible adjustment from time to time as hereinafter set
forth.  The shares of Common Stock or other securities or property deliverable
upon such exercise as adjusted from time to time are hereinafter sometimes
referred to as the "Warrant Shares" and the exercise price of a share of
Common Stock in effect at any time and as adjusted from time to time is
hereinafter sometimes referred to as the "Exercise Price."  Unless the context
otherwise requires, the term "Warrant" as used herein includes this Warrant
and any other warrant or warrants that may be issued pursuant to the provisions
of this Warrant, whether upon transfer, assignment, partial exercise,
divisions, combinations, exchange, or otherwise, and the term "Holder"
includes any transferee or transferees or assignee or assignees of the Holder
named above, all of whom shall be subject to the provisions of this Warrant,
and, when used with reference to Warrant Shares, means the holder or holders
of such Warrant Shares.
                                     -1-
<PAGE> 2

Section 1.    Exercise of Warrant.
              --------------------

      1.1.    Method of Exercise. This Warrant may be exercised in whole or in
part, but for not less than 25,000 Warrant Shares or the balance then 
exercisable, at any time by the Holder prior to 5:00 P.M., New York Time, 
on December 5, 2000, by presentation and surrender hereof to the Company at 
its principal office with the Subscription Form annexed hereto, duly 
executed and accompanied by payment, by certified or official bank checks 
payable to the order of the Company, of the Exercise Price for the total 
number of Warrant Shares purchased.

      1.2.    Delivery of Shares.  Upon proper exercise of this 
Warrant, the Company promptly shall deliver certificates for the Warrant 
Shares to the Holder duly legended as authorized in the Subscription Form.

      1.3.    Partial Exercise.  If this Warrant is exercised in part 
only, the Company shall, upon presentation of this Warrant upon such 
exercise, execute and deliver (with the certificate for the Warrant Shares 
purchased) a new Warrant evidencing the rights of the Holder hereof to 
purchase the balance of the Warrant Shares purchasable hereunder upon the 
same terms and conditions as herein set forth.

      1.4.    Fractional Shares.  No fractional shares or scrip 
representing fractional shares shall be issued upon exercise of this 
Warrant but, in lieu thereof, the Company shall round up to the next full 
share.

Section 2.    Exercise Price and Adjustments.
              -------------------------------

      2.1.    Initial Exercise Price and Capital Adjustments.  The 
Exercise Price at which the Warrant Shares shall be purchasable shall be 
$.50 per share, subject to adjustment from time to time in the event of 
stock dividends, stock subdivisions, stock splits, or stock combinations, 
as follows:  In the event the Company shall at any time after the date 
hereof issue shares of its Common Stock as a stock dividend or shall 
subdivide or split or combine the outstanding shares of its Common Stock, 
the Exercise Price shall forthwith proportionately be decreased in the case 
of a stock dividend, subdivision, or stock split or proportionately be 
increased in the case of combination, to the nearest one cent to give 
effect to such change.  Concurrently, the number of Warrant Shares issuable 
upon exercise of this Warrant shall be increased or decreased in proportion 
to the increase or decrease in the number of shares of Common Stock 
outstanding resulting from such change.  Any such adjustment shall become 
effective at the close of business on the date that the subdivision or 
combination shall become effective, in the event of a subdivision or 
combination, or at the close of business on the record date fixed for the 
determination of stockholders entitled to receipt of the stock dividend, in 
the event of a stock dividend.

      2.2.    Reorganizations, Mergers, and Sale of Assets.  In the 
event of any reorganization or reclassification of the outstanding shares 
of Common Stock (other than a change in par value, or from par value to no 
par value, or from no par value to par value, or as a

                               -2-
<PAGE> 3

result of a subdivision or combination) or in the case of any consolidation
of the Company with, or merger of the Company into, another corporation after
which no securities of the Company will be publicly held, or in the case of 
any sale, lease, or conveyance of all, or substantially all, of the 
property, assets, business, and goodwill of the Company as an entity, the 
Holder shall thereafter have the right upon exercise to purchase the kind 
and amount of shares of stock and other securities and property receivable 
upon such reorganization, reclassification, consolidation, merger, or sale 
by a holder of the number of shares of Common Stock that the Holder would 
have received had he exercised this Warrant immediately prior to such 
reorganization, reclassification, consolidation, merger, or sale, at a 
price equal to the aggregate Exercise Price then in effect pertaining to 
this Warrant (the kind, amount, and price of such stock and other 
securities to be subject to adjustment as herein provided).

      2.3.    Liquidation and Dissolution.  In the event the Company 
shall, at any time prior to the expiration of this Warrant and prior to the 
exercise thereof, dissolve, liquidate, or wind up its affairs, the Holder 
shall be entitled, upon the exercise thereof, to receive, in lieu of the 
shares that he would have been entitled to receive, the same kind and 
amount of assets as would have been issued, distributed, or paid to him 
upon any such dissolution, liquidation, or winding up with respect to such 
shares had he been the holder of record of such shares on the record date 
for the determination of those entitled to receive any such liquidating 
distribution.  After any such dissolution, liquidation, or winding up that 
shall result in any cash distribution in excess of the Exercise Price 
provided for by this Warrant, the Holder may, at his option, exercise the 
same without making payment of the Exercise Price, and in such case, the 
Company shall upon the distribution to the Holder consider that the 
Exercise Price has been paid in full to it and, in making settlement to the 
Holder, shall deduct from the amount payable to the Holder an amount equal 
to such Exercise Price.

      2.4.    Amendments Not Required to Reflect Adjustments.  
Irrespective of any adjustments in the Exercise Price or the number or kind 
of shares purchasable upon exercise of this Warrant, this Warrant may 
continue to express the same price and number and kind of shares as 
originally issued and need not be amended to reflect each such adjustment.

Section 3.    Exchange, Assignment, or Loss of Warrant.
              -----------------------------------------

      3.1.    Exchange of Warrant.  This Warrant is exchangeable,
without expense, at the option of the Holder, upon presentation and 
surrender hereof to the Company for other Warrants of different 
denominations entitling the Holder thereof to purchase in the aggregate the 
same number of Warrant Shares purchasable hereunder on the same terms and 
conditions as herein set forth.

      3.2.    Assignment of Warrant.  Subject to compliance with
Section 4 hereof, this Warrant may be assigned by presentation and 
surrender to the Company at its principal office or at the office of its 
stock transfer agent, if any, with the Assignment Form annexed hereto duly 
executed accompanied by funds sufficient to pay any transfer tax.  Upon 
such presentation and surrender, the Company shall, without charge, execute 
and deliver a new Warrant in the name of the assignee named in the 
Assignment Form and shall promptly cancel this Warrant.

                                 -3-
<PAGE> 4

      3.3.    Loss or Mutilation of Warrant.  Upon receipt by the
Company of evidence satisfactory to it of the loss, theft, destruction, or 
mutilation of this Warrant, and (in the case of loss, theft, or 
destruction) or reasonably satisfactory indemnification, and upon surrender 
and cancellation of this Warrant, if mutilated, the Company will execute 
and deliver a new Warrant of like tenor and date and any such lost, stolen, 
or destroyed Warrant shall thereupon become void.  Any such new Warrant 
executed and delivered shall constitute an additional contractual 
obligation on the part of the Company, whether or not this Warrant so lost, 
stolen, destroyed, or mutilated shall be at any time enforceable by anyone.

Section 4.    Compliance with Securities Act of 1933.
              ---------------------------------------

      4.1.    Disposition of Warrant and/or Warrant Shares.  This
Warrant and/or the Warrant Shares may not be sold or otherwise disposed of 
except as follows:

              (a)       To a person who, in the opinion of counsel reasonably
        satisfactory to the Company, is a person to whom this Warrant or the
        Warrant Shares may legally be transferred without registration and
        without the delivery of a current prospectus under the Act with respect
        thereto and then only against receipt of an agreement of such person
        to comply with the provisions of this Section 4 with respect to any
        resale or other disposition of such securities unless, in the opinion
        of counsel, such agreement is not required; or

              (b)       To any person upon delivery of a prospectus or offering
              circular then meeting the requirements of the Act relating to such
              securities and the offering thereof for such sale or disposition.

      4.2     Legending of Certificates.  Each certificate for Warrant Shares
or for any other security issued or issuable upon exercise of this Warrant 
shall contain a legend on the face thereof, in form and substance 
satisfactory to counsel to the Company, setting forth the restrictions on 
transfer thereof contained in this Section 4.

Section 5.    Company Covenants.
              ------------------
      5.1     Reservation and Issuance of Warrant Shares.  The Company hereby
undertakes until expiration of this Warrant to reserve for issuance and/or 
delivery upon exercise of this Warrant, such number of shares of its Common 
Stock as shall be required for issuance and/or delivery upon exercise 
hereon in full and agrees that all Warrant Shares so issued and/or 
delivered will be validly issued, fully paid, and non-assessable and 
further agrees to pay all taxes and charges that may be imposed upon such 
issuance and/or delivery.

      5.2     Officer's Certificate.  In the event the Exercise Price shall be
adjusted as required by Section 2 hereof, the Company shall mail to the 
Holder an officer's certificate setting forth the adjustments so required 
and including, in reasonable detail, the

                                  -4-
<PAGE> 5

method of calculating the adjustments and the transaction requiring the
adjustment.

Section 6.    Miscellaneous.
              --------------

      6.1     Status of Holder.  The Holder shall not be entitled to vote or
receive dividends and shall not otherwise be deemed a shareholder of the 
Company.

      6.2     Notices.  All notices required hereunder shall be sent by first-
class mail, postage prepaid, and shall be addressed, if to the Holder, to 
the last known address furnished to the Company and if to the Company, to: 
Cistron Biotechnology, Inc., 10 Bloomfield Avenue, Pine Brook, New Jersey  
07058, Attn: Bruce Galton, President, unless another address is designated 
in writing by the Holder of the Company.

      6.3     Binding Effect.  This Warrant shall be binding upon the Company,
its successors, and/or assigns and upon the Holder.

      6.4     Governing Law.  The validity, interpretation and performance of
this Warrant shall be governed by the laws of the State of New York.

      IN WITNESS WHEREOF, this Warrant has been duly executed by the Company
under its corporate seal as of the 6th day of December, 1996.

                                        CISTRON BIOTECHNOLOGY, INC.  


                                        By:/s/BRUCE C. GALTON
                                           ------------------
                                        Name: BRUCE C. GALTON

ATTEST:

/s/SETH I. TRUWIT, ESQ.
- -----------------------
Name: SETH I. TRUWIT, ESQ.

                                   -5-
<PAGE> 6

FORM OF ASSIGNMENT

                  (To be signed only upon such assignment)

                FOR VALUE RECEIVED, the undersigned hereby sells, assigns and
transfers unto 
the right represented by the within Warrant to purchase, from CISTRON
BIOTECHNOLOGY, INC. (the "Company"), shares of the Common  Stock of the
Company, to which the within Warrant relates, and appoints

attorney to transfer said right, with full power of substitution 
in the premises.


Dated:

_____________________________
(Signature must conform in all
 respects to name of holder as
 specified on the face of the 
 Warrant)

ATTEST:
_____________________________
Name

                                    -6-
<PAGE> 7
FORM OF SUBSCRIPTION

               (To be signed only upon exercise of Warrant)

To:	CISTRON BIOTECHNOLOGY, INC.

        The undersigned, the holder of the within Warrant, hereby irrevocably
elects to exercise the purchase rights represented by said Warrant for, and
to purchase thereunder, shares of Common Stock of the Company, and herewith
makes payment of $              therefor, consents to the affixation of a
legend on the certificate for such shares to the effect that such shares 
have not been registered under the Securities Act of 1933, as amended (the
"Act"), and may be transferred only in compliance with the Act, and requests
that such certificate(s) be issued in the name of and be delivered to


whose address is
and if such shares shall not be all of the shares purchased hereunder, that 
a new Warrant of like tenor for the balance of shares purchasable hereunder 
be delivered to the undersigned.

Dated:                                  _________________________________
                                        (Signature must conform in all
                                        respects to name of holder as
                                        specified on the face of the
                                        Warrant)

                                     -7-

<PAGE> 1


                                                        February 4, 1998

Kirkland & Ellis
200 East Randolph Drive
Chicago, Illinois  60601

        Re:     Warrants to purchase 250,000 of Common
                Stock of Cistron Biotechnology, Inc.
                --------------------------------------

Gentlemen:

        In consideration for your agreement to the terms set forth in your
letter dated October 17, 1997, Cistron Biotechnology, Inc. ("Cistron") 
agrees to amend the warrant dated December 6, 1996, entitling you to purchase
up to 250,000 shares of Cistron's Common Stock at $.50 per share.

        Pursuant to the terms of this letter agreement, you may elect to
exercise your warrants, as amended herein, and receive, without the payment of
any cash consideration, shares equal to the value of your warrants or any
portion thereof by the surrender of the warrants or such portion to Cistron.
Upon such surrender, Cistron shall issue to you such number of fully paid and
non-assessable shares of its Common Stock as is computed using the following
formula:

                                  X=Y(A-B)
                                    ------
                                      A

where X equals the number of shares to be issued to you, Y equals the 
number of shares covered by your warrants in respect of which this net 
issue election is made, A equals the fair market value of one share of 
Common Stock at the time the net issue election is made and B equals the 
exercise price in effect under your warrants at the time this net issue 
election is made.  The determination of fair market value shall be closing 
bid price of the Common Stock on the trading day immediately preceding the 
date of exercise or if there shall be no such closing bid price then as 
determined in good faith by Cistron's Board of Directors.

                                 -1-
<PAGE>2

        Except as modified herein, all terms and provisions of your 
warrants shall remain in full force and effect.

        Please indicate your agreement with the foregoing by signing below
where indicated below and returning a copy of this letter to me by fax 
and mail.

                                        Very truly yours,

                                        CISTRON BIOTECHNOLOGY, INC.

                                        By:/s/BRUCE C. GALTON
                                           ------------------
                                           BRUCE C. GALTON
                                           Acting Chairman and Chief
                                           Executive Officer

ACKNOWLEDGED AND ACCEPTED:

KIRKLAND & ELLIS

By: /s/ROBERT G. KRUPKA
    -------------------
Name:ROBERT G. KRUPKA
Title: PARTNER

                                     -2-
<PAGE>2

<PAGE> 1

Void after 5:00 P.M.                         Common Stock Warrant
New York Time                                to Purchase 400,000 Shares 
September 3, 2002                            of Common Stock of Cistron 
                                             Biotechnology, Inc.    
						  		

                            CISTRON BIOTECHNOLOGY, INC.

                           Common Stock Purchase Warrant
                                __________________

			This Warrant and the shares of Common Stock 
                issuable upon exercise of this Warrant have not been 
                registered under the Securities Act of 1933, as amended 
                (the "Act"), and may not be sold or otherwise disposed 
                of except (a) to a person who, in the opinion of 
                counsel reasonably acceptable to the Company, is a 
                person to whom the securities may be legally 
                transferred without registration and without delivery 
                of a current prospectus under the Act or (b) to a 
                person upon delivery of a prospectus or offering 
                circular then meeting the requirements of the Act 
                relating to such securities and the offering thereof 
                for such sale or disposition.

                                __________________

                                    -1-
<PAGE>2

        This certifies that, FOR VALUE RECEIVED, BLUESTONE CAPITAL 
PARTNERS, L.P. or registered assigns (the "Holder"), is entitled to 
purchase, subject to the provisions of this Warrant, from CISTRON 
BIOTECHNOLOGY, INC., a Delaware corporation (the "Company"), 400,000 shares 
of the Company's common stock, $.01 par value (the "Common Stock"), at a 
price of $.25 per share, exercisable to the extent provided below, at any 
time prior to 5:00 P.M., New York Time, on September 3, 2002, at which time 
this Warrant shall expire and become void.  The Holder has entered into a 
consulting agreement (the "Consulting Agreement") with the Company dated 
the date hereof for a term of six months, subject to renewal or earlier 
termination as provided therein.  The number of shares of Common Stock to 
be received upon exercise of this Warrant and the price to be paid for each 
share of Common Stock are subject to possible adjustment from time to time 
as hereinafter set forth.  The shares of Common Stock or other securities 
or property deliverable upon such exercise as adjusted from time to time 
are hereinafter sometimes referred to as the "Warrant Shares" and the 
exercise price of a share of Common Stock in effect at any time and as 
adjusted from time to time is hereinafter sometimes referred to as the 
"Exercise Price."  Unless the context otherwise requires, the term 
"Warrant" as used herein includes this Warrant and any other warrant or 
warrants that may be issued pursuant to the provisions of this Warrant, 
whether upon transfer, assignment, partial exercise, divisions, 
combinations, exchange, or otherwise, and the term "Holder" includes any 
transferee or transferees or assignee or assignees of the Holder named 
above, all of whom shall be subject to the provisions of this Warrant, and, 
when used with reference to Warrant Shares, means the holder or holders of 
such Warrant Shares.  Commencing on the date hereof, 200,000 Warrant Shares 
shall be exercisable, commencing December 3, 1997, subject to the 
Consulting Agreement then being in full force and effect, 100,000 
additional Warrant Shares shall become first exercisable and commencing 
March 3, 1998, subject to the Consulting Agreement then being in full force 
and effect, 100,000 additional Warrant Shares shall become first 
exercisable. 

        Section 1.      Exercise of Warrant.
                        --------------------

                1.1.    Method of Exercise.  This Warrant may be exercised
in whole or in part, but for not less than 25,000 Warrant Shares or the 
balance then exercisable, at any time by the Holder prior to 5:00 P.M., New 
York Time, on September 3, 2002 by presentation and surrender hereof to the 
Company at its principal office with the Subscription Form annexed hereto, 
duly executed and accompanied by payment, by certified or official bank 
checks payable to the order of the Company, of the Exercise Price for the 
total number of Warrant Shares purchased.

                1.2.    Delivery of Shares.  Upon proper exercise of this 
Warrant, the Company promptly shall deliver certificates for the Warrant 
Shares to the Holder duly legended as authorized in the Subscription Form.

                                  -2-
<PAGE>3
                1.3.    Partial Exercise.  If this Warrant is exercised in 
part only, the Company shall, upon presentation of this Warrant upon such 
exercise, execute and deliver (with the certificate for the Warrant Shares 
purchased) a new Warrant evidencing the rights of the Holder hereof to 
purchase the balance of the Warrant Shares purchasable hereunder upon the 
same terms and conditions as herein set forth.

                1.4.    Fractional Shares.  No fractional shares or scrip 
representing fractional shares shall be issued upon exercise of this 
Warrant but, in lieu thereof, the Company shall round up to the next full 
share. 

        Section 2.      Exercise Price and Adjustments.
                        -------------------------------

                2.1.    Initial Exercise Price and Capital Adjustments.  The 
Exercise Price at which the Warrant Shares shall be purchasable shall be 
$.25 per share, subject to adjustment from time to time in the event of 
stock dividends, stock subdivisions, stock splits, or stock combinations, 
as follows:  In the event the Company shall at any time after the date 
hereof issue shares of its Common Stock as a stock dividend or shall 
subdivide or split or combine the outstanding shares of its Common Stock, 
the Exercise Price shall forthwith proportionately be decreased in the case 
of a stock dividend, subdivision, or stock split or proportionately be 
increased in the case of combination, to the nearest one cent to give 
effect to such change.  Concurrently, the number of Warrant Shares issuable 
upon exercise of this Warrant shall be increased or decreased in proportion 
to the increase or decrease in the number of shares of Common Stock 
outstanding resulting from such change.  Any such adjustment shall become 
effective at the close of business on the date that the subdivision or 
combination shall become effective, in the event of a subdivision or 
combination, or at the close of business on the record date fixed for the 
determination of stockholders entitled to receipt of the stock dividend, in 
the event of a stock dividend.  

                2.2.    Reorganizations, Mergers, and Sale of Assets.  In the
event of any reorganization or reclassification of the outstanding shares 
of Common Stock (other than a change in par value, or from par value to no 
par value, or from no par value to par value, or as a result of a 
subdivision or combination) or in the case of any consolidation of the 
Company with, or merger of the Company into, another corporation after 
which no securities of the Company will be publicly held, or in the case of 
any sale, lease, or conveyance of all, or substantially all, of the 
property, assets, business, and goodwill of the Company as an entity, the 
Holder shall thereafter have the right upon exercise to purchase the kind 
and amount of shares of stock and other securities and property receivable 
upon such reorganization, reclassification, consolidation, merger, or sale 
by a holder of the number of shares of Common Stock that the Holder would 
have received had he exercised this Warrant immediately prior to such 
reorganization, reclassification, consolidation, merger, or sale, at a 
price equal to the aggregate Exercise Price then in effect pertaining to 
this Warrant (the kind, amount, and price of such stock and other 
securities to be subject to adjustment as herein provided).

                               -3-
<PAGE>4
                2.3.    Liquidation and Dissolution.  In the event the 
Company shall, at any time prior to the expiration of this Warrant and 
prior to the exercise thereof, dissolve, liquidate, or wind up its affairs, 
the Holder shall be entitled, upon the exercise thereof, to receive, in 
lieu of the shares that he would have been entitled to receive, the same 
kind and amount of assets as would have been issued, distributed, or paid 
to him upon any such dissolution, liquidation, or winding up with respect 
to such shares had he been the holder of record of such shares on the 
record date for the determination of those entitled to receive any such 
liquidating distribution.  After any such dissolution, liquidation, or 
winding up that shall result in any cash distribution in excess of the 
Exercise Price provided for by this Warrant, the Holder may, at his option, 
exercise the same without making payment of the Exercise Price, and in such 
case, the Company shall upon the distribution to the Holder consider that 
the Exercise Price has been paid in full to it and, in making settlement to 
the Holder, shall deduct from the amount payable to the Holder an amount 
equal to such Exercise Price.

                2.4.    Amendments Not Required to Reflect Adjustments.  
Irrespective of any adjustments in the Exercise Price or the number or kind 
of shares purchasable upon exercise of this Warrant, this Warrant may 
continue to express the same price and number and kind of shares as 
originally issued and need not be amended to reflect each such adjustment.

        Section 3.      Exchange, Assignment, or Loss of Warrant.
                        -----------------------------------------

                3.1.    Exchange of Warrant.  This Warrant is exchangeable, 
without expense, at the option of the Holder, upon presentation and 
surrender hereof to the Company for other Warrants of different 
denominations entitling the Holder thereof to purchase in the aggregate the 
same number of Warrant Shares purchasable hereunder on the same terms and 
conditions as herein set forth.

                3.2.    Assignment of Warrant.  Subject to compliance with 
Section 4 hereof, this Warrant may be assigned by presentation and 
surrender to the Company at its principal office or at the office of its 
stock transfer agent, if any, with the Assignment Form annexed hereto duly 
executed accompanied by funds sufficient to pay any transfer tax.  Upon 
such presentation and surrender, the Company shall, without charge, execute 
and deliver a new Warrant in the name of the assignee named in the 
Assignment Form and shall promptly cancel this Warrant.

                3.3.    Loss or Mutilation of Warrant.  Upon receipt by the 
Company of evidence satisfactory to it of the loss, theft, destruction, or 
mutilation of this Warrant, and (in the case of loss, theft, or 
destruction) or reasonably satisfactory indemnification, and upon surrender 
and cancellation of this Warrant, if mutilated, the Company will execute 
and deliver a new Warrant of like tenor and date and any such lost, stolen, 
or destroyed Warrant shall thereupon become void.  Any such new Warrant 
executed and delivered shall constitute an

                                -4-
<PAGE>5

additional contractual obligation on the part of the Company, whether or not
this Warrant so lost, stolen, destroyed, or mutilated shall be at any time
enforceable by anyone.

        Section 4.      Compliance with Securities Act of 1933.
                        ---------------------------------------

                4.1.    Disposition of Warrant and/or Warrant Shares.  This 
Warrant and/or the Warrant Shares may not be sold or otherwise disposed of 
except as follows:

                        (a)     To a person who, in the opinion of counsel 
        reasonably satisfactory to the Company, is a person to whom this 
        Warrant or the Warrant Shares may legally be transferred without 
        registration and without the delivery of a current prospectus 
        under the Act with respect thereto and then only against receipt 
        of an agreement of such person to comply with the provisions of 
        this Section 4 with respect to any resale or other disposition of 
        such securities unless, in the opinion of counsel, such agreement 
        is not required; or

                        (b)     To any person upon delivery of a prospectus
        or offering circular then meeting the requirements of the Act 
        relating to such securities and the offering thereof for such 
        sale or disposition.

                4.2.    Legending of Certificates.  Each certificate for
Warrant Shares or for any other security issued or issuable upon exercise 
of this Warrant shall contain a legend on the face thereof, in form and 
substance satisfactory to counsel to the Company, setting forth the 
restrictions on transfer thereof contained in this Section 4.

        Section 5.      Registration Rights.
                        --------------------

                5.1.    Demand Registration Rights.  At any time subsequent 
to September 4, 1997 and prior to the Termination Date, upon the written 
request of the Holders of a majority of the Warrant Shares issuable (or 
issued) under this Warrant, the Company shall on one occasion promptly file 
(notwithstanding that at the time of the request this Warrant shall not 
theretofore have been exercised) and process to effectiveness under the 
Securities Act of 1933, the requisite post-effectiveness amendments or new 
registration statement necessary to permit the public offering of the 
Warrant Shares requested to be registered in such written request and shall 
keep the final prospectus current for a period of nine months to permit the 
public offering to be effected during such period.  All costs, expenses and 
fees of such registration shall be paid by the Company. 

                5.2.    "Piggyback" Registration Rights.  In the event the 
Company at any time subsequent to September 4, 1997 and prior to the 
Termination Date contemplates the filing of a registration statement under 
the Securities Act of 1933 on Form S-1, S-2 or S-3 for the public offering 
of shares of its Common Stock for its own account, the Company shall give 
written notice thereof to the Holder of this Warrant (and/or the Warrant 
Shares issued upon
                                  -5-
<PAGE>6

exercise hereof) at least 30 days prior to the anticipated filing date and,
upon the written request of such Holder, will, subject to the consent of the
managing underwriter of such offering, include in such registration statement,
at the Company's expense, the number of Warrant Shares requested.  Nothing in
this Section 5.2 shall be deemed to create any liability on the part of the
Company to the Holder if the Company, at its sole discretion, should decide
not to proceed with the processing of such registration statement after filing
and before the registration statement shall become effective.  The Company
shall be under no obligation to the Holder to keep such registration statement
current after completion of the offering by the underwriters.  Any Warrant
Shares not sold by the Holder pursuant to such registration statement shall
be de-registered.

                5.3.    Expenses.  The expenses to be paid by the Company in 
connection with the registration rights granted in Section 5.2 shall 
include, without limitation, the fees and expenses of the Company's counsel 
and accountants, the costs and expenses incident to the preparation, 
printing, filing and processing to effectiveness of the registration 
statement, the costs of furnishing the selling Holder of Warrant Shares 
with a reasonable number of copies of the Final Prospectus, and the fees 
and disbursements incurred in qualifying the Warrant Shares under 
applicable blue sky or securities laws, but shall not include any 
underwriting discounts or commissions, stock transfer taxes and fees and 
expenses of counsel for the Holder of this Warrant and/or the Warrant 
Shares issuable upon exercise hereof.

                5.4.    Information To Be Furnished By Holder.  The Holder 
shall furnish in writing to the Company all appropriate information 
reasonably requested by the Company concerning such Holder in connection 
with the preparation and processing of the requisite registration statement 
or post-effective amendments relating to a public offering of the Warrant 
Shares, including a shareholder's questionnaire, a warranty as to legal 
capacity to sell and a statement as to knowledge of adverse facts relating 
to the Company, and shall otherwise cooperate with the Company in 
connection therewith.

                5.5.    Indemnification.  The Company shall indemnify and 
hold harmless each Holder of Warrant Shares included in any registration 
statement or post-effective amendment relating to a public offering of 
Warrant Shares and each underwriter, within the meaning of the Securities 
Act of 1933, who may purchase Warrant Shares from, or sell Warrant Shares 
on behalf of, any such Holder from and against any and all losses, claims, 
damages and liabilities, joint or several, to which any such person may 
become subject under the Securities Act of 1933, or otherwise, caused by, 
arising out of or based upon any untrue statement or alleged untrue 
statement of a material fact contained in such registration statement or 
post-effective amendment or any prospectus included therein, or caused by, 
arising out of or based upon the omission or alleged omission to state 
therein a material fact required to be stated therein or necessary to make 
the statements therein not misleading, and to reimburse each such Holder 
and underwriter for any legal or other expenses reasonably incurred in

                             -6-
<PAGE>7

connection with investigating or defending any such loss, claim, damage, 
liability or action, except insofar as such losses, claims, damages or 
liabilities arose out of or are based upon any such untrue statement or 
alleged untrue statement or omission or alleged omission based upon 
information furnished in writing to the Company by such Holder or 
underwriter expressly for use in such registration statement or post-
effective amendment, which indemnification shall include such person, if 
any, who controls any such Holder or underwriter within the meaning of the 
Securities Act of 1933; provided, however, that the Company shall not be 
obligated to so indemnify any such Holder or underwriter unless such Holder 
or underwriter shall at the same time reciprocally indemnify the Company, 
its directors, each officer signing the related registration statement or 
post-effective amendment and each person, if any, who controls the Company 
within the meaning of the Securities Act of 1933 from and against any and 
all losses, claims, damages and liabilities, joint and several, to which 
the Company or any such person may become subject under the Securities Act 
of 1933, or otherwise, caused by, arising out of or based upon any true 
statement or alleged untrue statement of a material fact contained in such 
registration statement or post-effective amendment or any prospectus 
included therein, or caused by, arising out of or based upon the omission 
or alleged omission to state therein a material fact required to be stated 
therein or necessary to make the statements therein not misleading, and to 
reimburse the Company and each such person for any legal or other expenses 
reasonably incurred in connection with investigating or defending any such 
loss, claim, damage, liability or action, but only to the extent that such 
untrue statement or alleged untrue statement, omission or alleged omission 
is caused by, arises out of or is based upon information furnished in 
writing to the Company by such Holder or underwriter expressly for use in 
such registration statement or post-effective amendment.

        Section 6.      Company Covenants.
                        ------------------

                6.1.    Reservation and Issuance of Warrant Shares.  The 
Company hereby undertakes until expiration of this Warrant to reserve for 
issuance and/or delivery upon exercise of this Warrant, such number of 
shares of its Common Stock as shall be required for issuance and/or 
delivery upon exercise hereon in full and agrees that all Warrant Shares so 
issued and/or delivered will be validly issued, fully paid, and non-
assessable and further agrees to pay all taxes and charges that may be 
imposed upon such issuance and/or delivery.

                6.2.    Officer's Certificate.  In the event the Exercise 
Price shall be adjusted as required by Section 2 hereof, the Company shall 
mail to the Holder an officer's certificate setting forth the adjustments 
so required and including, in reasonable detail, the method of calculating 
the adjustments and the transaction requiring the adjustment.

        Section 7.      Miscellaneous.
                        --------------

                7.1.    Status of Holder.  The Holder shall not be entitled 
to vote or receive dividends and shall not otherwise be deemed a 
shareholder of the Company.

                                -7-
<PAGE>8
                7.2.    Notices.  All notices required hereunder shall be 
sent by first-class mail, postage prepaid, and shall be addressed, if to 
the Holder, to the last known address furnished to the Company and if to 
the Company, to: Cistron Biotechnology, Inc., 10 Bloomfield Avenue, Pine 
Brook, New Jersey  07058, Attn: Bruce Galton, President, unless another 
address is designated in writing by the Holder of the Company.

                7.3.    Binding Effect.  This Warrant shall be binding upon 
the Company, its successors, and/or assigns and upon the Holder.

                7.4.    Governing Law.  The validity, interpretation and 
performance of this Warrant shall be governed by the laws of the State of 
New York.
                                  -8-

<PAGE>9
		IN WITNESS WHEREOF, this Warrant has been duly executed by
the Company under its corporate seal as of the 4th day of September 1997. 



                                              CISTRON BIOTECHNOLOGY, INC.  


                                              By:/s/BRUCE C. GALTON
                                                 ------------------
                                              Name: BRUCE C. GALTON
                                              Title: CHAIRMAN OF THE BOARD
                                                     CHIEF EXECUTIVE OFFICER

ATTEST:


/s/SETH I. TRUWIT, ESQ.
- -----------------------
Name: SETH I. TRUWIT

                                 -9-
<PAGE>10

FORM OF ASSIGNMENT

                     (To be signed only upon such assignment)



		FOR VALUE RECEIVED, the undersigned hereby sells, 
assigns and transfers unto 
the right represented by the within Warrant to purchase, from 
CISTRON BIOTECHNOLOGY, INC. (the "Company"), shares of the Common 
Stock of the Company, to which the within Warrant relates, and 
appoints

attorney to transfer said right, with full power of substitution 
in the premises.

Dated:

							
                                ______________________________
                                (Signature must conform in all
                                 respects to name of holder as
                                 specified on the face of the 
                                 Warrant)                    


ATTEST:


_____________________________
Name:

                                 -10-
<PAGE>11

FORM OF SUBSCRIPTION

                (To be signed only upon exercise of Warrant)



To:	CISTRON BIOTECHNOLOGY, INC.



		The undersigned, the holder of the within Warrant, hereby 
irrevocably elects to exercise the purchase rights represented by said 
Warrant for, and to purchase thereunder,      shares of Common Stock of the 
Company, and herewith makes payment of $               therefor, consents 
to the affixation of a legend on the certificate for such shares to the 
effect that such shares have not been registered under the Securities Act 
of 1933, as amended (the "Act"), and may be transferred only in compliance 
with the Act, and requests that such certificate(s) be issued in the name 
of and be delivered to

whose address is
and if such shares shall not be all of the shares purchased hereunder, that 
a new Warrant of like tenor for the balance of shares purchasable hereunder 
be delivered to the undersigned.


Dated:                                  _________________________________
                                          (Signature must conform in all
                                           respects to name of holder as
                                           specified on the face of the
                                           Warrant)

                                 -11-

<PAGE> 1

               COMMON STOCK AND WARRANT PURCHASE AGREEMENT


        THIS COMMON STOCK AND WARRANT PURCHASE AGREEMENT (this "Agreement"),
is entered into as of October 30, 1998, by CISTRON BIOTECHNOLOGY, INC., a 
Delaware corporation (the "Company") and PASTEUR MeRIEUX SERUMS & VACCINS, 
S.A., a societe anonyme organized under the Laws of France (the 
"Purchaser").

        WHEREAS, the Company has authorized the sale and issuance to Purchaser
of 1,333,333 shares of Common Stock of the Company (the "Shares") and a 
warrant to purchase 666,667 shares of Common Stock at $0.25 per share, 
subject to adjustment in the form of Exhibit A hereto (the "Warrant") for 
the aggregate purchase price of $1,000,000.

        WHEREAS, the Company desires to issue and sell the Shares and Warrant
to the Purchaser, and Purchaser desires to purchase the shares, on the terms 
and conditions set forth herein; and

        NOW, THEREFORE, in consideration to the mutual covenants and agreements
contained herein and for other good and valuable consideration, the receipt 
and sufficiency of which are hereby acknowledged by the parties, the 
parties hereto agree as follows:

                             ARTICLE 1

                        SALE AND PURCHASE

SECTION 1.1     SALE AND PURCHASE.   Upon the terms and subject to the
conditions hereof, the Company hereby issues and sells to the Purchaser, and
the Purchaser purchases and accepts from the Company, the Shares and Warrant. 

                              ARTICLE 2

                  CLOSING, DELIVERY AND PAYMENT

SECTION 2.1     CLOSING.  The closing of the sale and purchase of the Shares
under this Agreement (the "Closing") has been held on the date hereof at the
principal offices of the Company, 10 Bloomfield Avenue, Pine Brook, New 
Jersey  07058.

SECTION 2.2     DELIVERY.  At the Closing, the Company delivered to the
Purchaser one or more stock certificates registered in the name of the
Purchaser representing the Shares to be purchased hereunder, the Warrant,
the registration rights agreement in the form of Exhibit B hereto (the 
"Registration Rights Agreement") and the other documents required to be 
delivered pursuant to Article 6 and the Purchaser paid the aggregate 
purchase price for the Shares and Warrant of $1,000,000 by wire transfer of 
immediately available funds delivered in accordance with the Company's 
instructions and delivered the other documentation to the Company required 
pursuant to Article 6.

                                -1-
<PAGE>2
                             ARTICLE 3

                REPRESENTATIONS AND WARRANTIES OF THE COMPANY

        The Company hereby represents and warrants to the Purchaser that,
except as disclosed in writing to the Company in a disclosure schedule
previously delivered by the Company to the Purchaser (the "Disclosure
Schedule"):

SECTION 3.1     ISSUER'S ORGANIZATION, GOOD STANDING AND QUALIFICATION.  The
Company is a corporation duly organized, validly existing and in good 
standing under the laws of the State of Delaware, and has all requisite 
corporate power and authority to own, operate and lease its properties and 
to carry on its business as presently conducted and as described in the 
Company's Annual Report on Form 10-K for the fiscal year ended June 30, 
1998 (the "Company 10-K for 1998") as filed with the United States 
Securities and Exchange Commission (the "SEC").  The Company is duly 
qualified as a foreign corporation and is in good standing in each 
jurisdiction where the character of the property owned or leased by it or 
the nature of its activities makes such qualification necessary, except for 
those jurisdictions where the failure to do so would not, individually or 
in the aggregate, have a material adverse effect on the business or
financial condition or operations of the Company.

SECTION 3.2     ISSUER'S POWER AND AUTHORITY.  (a) The Company has all
requisite power and authority to execute and deliver this Agreement and to
perform its obligations hereunder and to consummate the transactions
contemplated hereby.  The execution, delivery and performance by the Company
of this Agreement and the Warrant and the consummation by the Company of the 
transactions contemplated hereby have been duly authorized and approved by 
the Company's Board of Directors and no further action on the part of the 
Company or its stockholders is necessary to authorize the execution, 
delivery and performance of this Agreement, the Warrant or the consummation 
by the Company of the transactions contemplated hereby.  This Agreement, 
the Warrant and the Registration Agreement have been duly executed and 
delivered by the Company and constitute the valid and binding obligation of 
the Company, enforceable against the company in accordance with their 
respective terms, except as enforcement thereof (i) may be limited by 
bankruptcy, insolvency, reorganization, fraudulent conveyance, moratorium 
or other similar laws relating to or affecting enforcement of creditors' 
rights generally, or (ii) is subject to general principles of equity 
(regardless of whether enforcement is considered in a proceeding in equity 
or at law).

SECTION 3.3     NO CONFLICT, CONSENTS.

(a)     No Conflict.  The execution and delivery of this Agreement by the
Company does not, and the performance of this Agreement and the consummation
of any of the transactions contemplated by this Agreement by the Company will
not, directly or indirectly (with or without notice or lapse of time):

        (i)   contravene, conflict with or result in a violation of (A) any of
the provisions of the certificate of incorporation or bylaws of the Company, or
(B) any resolution adopted by the Company's Board of Directors;

                                   -2-
<PAGE>3

        (ii)  contravene, conflict with or result in a violation of, any law,
rule, regulation or order binding upon the Company or any of the properties or
assets owned or used by the Company;

        (iii) contravene, conflict with or result in a violation of any of the
terms or requirements of any governmental authorization that is held by the
Company or that otherwise relates to the business of, or any of the properties
or assets owned or used by, the Company;

        (iv)  contravene, conflict with or result in a violation or breach of,
or result in a default under, any provision of any material contract to which
the Company is a party, or give any person or entity the right to (A) declare a
default or exercise any remedy under any such contract, (B) accelerate the 
maturity or performance of any such contract, or (C) cancel, terminate, 
amend or modify any such contract; or

        (v)  result in the imposition or creation of any lien or other
encumbrance on or with respect to any property or asset owned or used by the
Company.

(b)     Consents.  The execution and delivery of this Agreement does not, and
the performance of this Agreement will not, require any filing with or the 
giving any notice to, or obtaining the consent from, any person, entity or 
governmental authority, except for applicable requirements, if any, of (i) 
the Securities Act of 1933, as amended (the "Securities Act"), (ii) the 
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and (iii) 
state securities or "blue sky" laws.

SECTION 3.4     REPORTS; FINANCIAL STATEMENTS; LIABILITIES.

(a)     The Company has filed all required forms, reports and documents with
the SEC required to be filed by it with respect to all periods commencing
since July 1, 1996 (the "SEC Reports"), all of which have complied in all 
material respects with all applicable requirements of the Securities Act 
and the Exchange Act, as the case may be, and the rules and regulations 
promulgated thereunder.  None of such forms, reports or documents 
(including the financial statements included therein, which are dealt with 
in the following paragraph), at the time filed, contained any untrue 
statement of a material fact or omitted to state a material fact required 
to be stated therein or necessary in order to make the statements therein, 
in light of the circumstances under which they were made, not misleading.  
There are no material contracts or documents of the Company required to be 
filed as exhibits to the SEC Reports by the Securities Act or the Exchange
Act, as the case may be, or the rules and regulations promulgated thereunder
that have not been so filed.

(b) The audited financial statements and unaudited interim financial statements 
of the Company included in the SEC Reports (the "Financial Statements") 
were prepared in accordance with generally accepted accounting principles 
applied on a consistent basis throughout the periods covered (except as may 
be indicated therein or in the notes thereto or, in the case of unaudited 
interim statements, to the extent they may not include footnotes or may be 
condensed or summary financial statements).  The Financial Statements 
fairly present the financial position to the Company as at the respective 
dates thereof and the results of operations and cash flows of the Company 
for the periods covered thereby, subject, in the case of unaudited interim 
financial
                                -3-
<PAGE>4

statements, to normal and recurring year-end adjustments, which
were not and are not expected, individually or in the aggregate, to be 
material in amount).

SECTION 3.6     ABSENCE OF CERTAIN CHANGES.  Since June 30, 1998, there has
not been, except as indicated in any subsequently filed SEC Reports, any
change in the assets, liabilities, financial condition or operations of the 
company from that reflected in the Company 10-K for 1998, other than 
changes in the ordinary course of business, none of which individually or 
in the aggregate has had or is expected to have a material adverse effect 
on the Company.

SECTION 3.6      NO INTEGRATION.  Neither the Company nor any of its
affiliates, nor any person acting on its or their behalf, has, within the
six-month period prior to the date hereof, offered or sold or otherwise
disposed of any shares of its capital stock or instruments representing
interest in its capital stock, nor agreed to do any of the foregoing by
means of any form of general solicitation or advertising within the meaning
of Rule 502(c) under the Securities Act.

SECTION 3.7     NO BROKERS.  Except as set forth on the Disclosure Schedule,
no broker, finder or investment banker is entitled to any brokerage, finder
or other fee or commission in connection with the transactions contemplated
by this Agreement based on arrangements made by or on behalf of the Company.

SECTION 3.8     CAPITALIZATION.  The authorized capital stock of the Company 
immediately following the Closing is set forth on the Disclosure Schedule.

(a)     Other than that which is set forth on Disclosure Schedule there are
no other authorized or issued shares of capital stock of the Company.

(b)     Other than that which is set forth on the Disclosure Schedule there
are: (i) no outstanding warrants, options, agreements, convertible securities
or other commitments or instruments pursuant to which the Company is or may 
become obligated to issue, sell, repurchase or redeem any shares of capital 
stock or other securities of the Company, except pursuant to the Company's 
certificate of incorporation, this Agreement and the Warrant; (ii) no 
preemptive, contractual or similar rights to purchase or otherwise acquire 
shares of capital stock of the Company pursuant to any provision of law or 
any agreement to which the Company is a party, except pursuant to this 
Agreement and the Warrant; (iii) no restrictions on the transfer of capital 
stock of the Company imposed by any statute, other than those imposed by 
relevant state and federal securities laws, or any agreement to which the 
Company is a party, or any order of any court or any governmental agency to 
which the Company is subject; (iv) to the best of our knowledge and belief, 
no cumulative voting rights for any of the Company's capital stock; (v) no 
registration rights under the Securities Act, with respect to shares of the 
Company's capital stock, except pursuant to the Registration Agreement; 
(vi) to the best of the Company's knowledge and belief, no options or other 
rights to purchase shares of capital stock from stockholders of the Company 
granted by such stockholders, except pursuant to the Warrant; and (vii) no 
agreements, written or oral, between the Company and any holder of its 
securities, or, to the best of the Company's knowledge and belief, among 
holders of its securities, relating to

                               -4-
<PAGE>5

the acquisition, disposition or voting of the securities of the Company,
except pursuant to the Warrant and Registration Agreement.

SECTION 3.9     BUSINESS OF THE COMPANY.  Since 1990 each employee of or
consultant to the Company who has or is proposed to have access to 
confidential and/or proprietary information of the Company (other than the 
Company's legal counsel) is a signatory to, and is bound by, an agreement 
with the Company relating to nondisclosure, proprietary information and 
assignment of intellectual property rights.

SECTION 3.10    SECURITIES LAWS.  Neither the Company nor, to the best
knowledge of the Company, anyone acting on its behalf has offered securities
of the Company for sale to, or solicited any offers to buy the same from, or
sold securities of the Company to, any person or organization, in any case so
as to subject the Company, its promoters, directors and/or officers to any 
liability under the Securities Act, the Exchange Act, or any state 
securities or "blue sky" law (collectively, "Securities Laws").  The sale 
of the Shares will not violate any provision of the Securities Laws when 
offered, issued and sold in accordance with this Agreement or the Warrant.

                             ARTICLE 4

            REPRESENTATIONS AND WARRANTIES OF THE PURCHASER

       The Purchaser hereby represents and warrants to the Company as follows:

SECTION 4.1     PURCHASER'S ORGANIZATION, GOOD STANDING AND QUALIFICATION. The
Purchaser is a societe anonyme duly organized, validly existing and in 
good standing under the laws of France, and has all requisite corporate 
power and authority to own, operate and lease its properties and to carry 
on its business as presently conducted.  The Purchaser is duly qualified as 
a foreign corporation and is in good standing in each jurisdiction where 
the character of the property owned or leased by it or the nature of its 
activities makes such qualification necessary, except for those 
jurisdictions where the failure to do so would not, individually or in the 
aggregate, have a material adverse effect on the business or financial 
condition or operations of the Purchaser.

SECTION 4.2     PURCHASER'S POWER AND AUTHORITY.  The Purchaser has all
requisite power and authority to execute and deliver this Agreement and to
perform its obligations under such agreements and to consummate the
transactions contemplated hereby.  The execution, delivery and performance
by the Purchaser of this Agreement and the consummation by the Purchaser of
the transactions contemplated hereby have been duly authorized and approved
by the Purchaser's Board of Directors and no further action on the part of
the Purchaser or its stockholders is necessary to authorize the execution, 
delivery and performance of such agreements or the consummation by the 
Purchaser of the transactions contemplated hereby.  This Agreement has been 
duly executed and delivered by the Purchaser and constitutes the valid and 
binding obligation of the Purchaser, enforceable against the Purchaser in 
accordance with its terms, except as enforcement thereof (i) may be limited 
by bankruptcy, insolvency, reorganization, fraudulent conveyance, 
moratorium or other similar laws

                                    -5-
<PAGE>6

relating to or affecting enforcement of creditors' rights generally, or
(ii) is subject to general principles of equity (regardless of whether
enforcement is considered in a proceeding in equity or at law).

SECTION 4.3     NO CONFLICT; CONSENTS.

(a)     No Conflict.  The execution and delivery of this Agreement by the
Purchaser does not, and the performance of this Agreement and the consummation
of any of the transactions contemplated by this Agreement by the Purchaser will
not, directly or indirectly (with or without notice or lapse of time):

        (i)  contravene, conflict with or result in a violation of (A) any of
the provisions of the articles of incorporation or bylaws of the Purchaser, or
(B) any resolution adopted by the Purchaser's Board of Directors;

        (ii) contravene, conflict with or result in a violation of, any law,
rule, regulation or order binding upon the Purchaser or any of the properties
or assets owned or used by the Purchaser;

        (iii) contravene, conflict with or result in a violation of any of the
terms or requirements of, any governmental authorization that is held by the 
Purchaser or that otherwise relates to the business of, or any of the 
properties or assets owned or used by, the Purchaser;

        (iv)  result in the imposition or creation of any lien or other
encumbrance on or with respect to any property or asset owned or used by the
Purchaser.

(b)     Consents.  The execution and delivery of this Agreement do not, and
the performance of this Agreement and the consummation of the transactions 
contemplated hereby will not, require any filing with or the giving of any 
notice to, or the obtaining any consent from, any governmental authority.

SECTION 4.4     INVESTMENT REPRESENTATIONS.

(a) Representations.  The Purchaser understands that the Shares and Warrants
(and the shares of Common Stock issuable upon exercise of the Warrant) have 
not been, and will not be, registered under the Securities Act or any other 
securities law.  The Purchaser also understands that the Shares and 
Warrants are being offered and sold pursuant to an exemption from 
registration contained in Section 4(2) of the Securities Act as part of an 
issue not involving a public offering.  To confirm to the Company the basis 
of such an exemption, Purchaser hereby represents and warrants to the 
Company as follows:

        (i)  Purchaser Bears Economic Risk.  The Purchaser understands that it
must bear the economic risk of this investment indefinitely unless the Shares
and Warrants (and the shares of Common Stock underlying the Warrants) are 
registered pursuant to the Securities Act, or an exemption from 
registration is available.  Purchaser acknowledges that Company is a 
development stage company and has not operated profitably and there can be 
no assurance it will operate profitably.  Purchaser acknowledges that it is 
fully capable of bearing such economic risk.

                                  -6-
<PAGE>7

        (ii)  Acquisition for Own Account.  The Purchaser is acquiring the
Shares and Warrant for the Purchaser's own account for investment only, and
not with a view towards their distribution or resale.

        (iii) Purchaser Can Protect Its Interest.  The Purchaser represents
that by reason of its, or of its management's, business or financial experience,
the Purchaser has the capacity to protect its own interests in connection 
with the transactions contemplated in this Agreement.  Further, the 
Purchaser is aware of no publication of any advertisement in connection 
with the transactions contemplated in the Agreement.

        (iv)  Accredited Investor.  The Purchaser represents that it is an
"accredited investor" within the meaning of Regulation D under the Securities
Act.

        (v)  Company Information.  The Purchaser has requested, received,
reviewed and considered all the information that the Purchaser considers
necessary for making an informed decision to invest in the Shares and Warrant,
and that Purchaser has received or has access (on its own) to copies of the SEC
Reports, including (i) the Company's report on Form 10-K for 1998.  The 
Purchaser has also had an opportunity (i) to ask questions of and receive 
answers from the Company regarding the contemplated issuance of the Shares 
and Warrant, and the business, properties, prospects and financial 
condition of the Company, and (ii) to obtain such additional information 
(to the extent that the Company possessed such information or could acquire 
it without unreasonable effort or expense) necessary to verify the accuracy 
of any information furnished to the Purchaser or to which the Purchaser had 
access.

(b)     Rule 144.  Purchaser acknowledges and agrees that the Shares and
Warrants (and shares of Common Stock issuable upon exercise of the Warrant)
must be held indefinitely unless they are subsequently registered under the 
Securities Act or an exemption from such registration is available.  
Purchaser understands that except for its obligations under the 
Registration Agreement to be delivered under Article 6, the Company is 
under no obligation (A) to register the Shares or Warrant (or shares of 
Common Stock isusable upon exercise of the Warrant) under the Securities 
Act or any state securities act or (B) to comply with the requirements for 
any exemption which might otherwise be available thereunder.  Further, 
Purchaser acknowledges that except for its obligations under the 
Registration Agreement to be delivered under Article 6, the Company has 
made no agreement to register the Shares or Warrant (or shares of Common 
Stock issauble upon exercise of the Warrant) under such laws or to take 
action to provide for the future availability of any exemption thereunder.  
Purchaser has been advised or is aware of the provisions of Rule 144 
promulgated under the Securities Act as in effect from time to time, which 
permits limited resale of securities purchased in a private placement 
subject to the satisfaction of certain conditions including, among other 
things, the availability of certain current public information about the 
Company, the resale occurring following the required holding period under 
Rule 144 and the number of shares being sold during any three-month period 
not exceeding specified limitations.

                                 -7-
<PAGE>8

(c)     Legend.  Purchaser understands and agrees that stop-transfer
instructions may be noted on the appropriate records of Company, and that
there will be placed on the certificates for the Shares and on the Warrant, or
any substitutions therefor, a legend stating in substance:

        The securities evidenced by this certificate have not been
        registered under the Securities Act of 1933, as amended (the 
        "Securities Act"), in reliance upon the exemption from 
        registration under the Securities Act and have not been 
        registered under the securities laws of applicable states in 
        reliance upon applicable exemptions from registration under the 
        securities laws of such states.  These shares have been acquired 
        for investment purposes only and may not be offered, sold or 
        transferred, nor will any assignee or transferee thereof be 
        recognized by the Company as having any interest in these 
        shares, in the absence of (i) an effective registration 
        statement with respect to the shares under the Securities Act 
        and applicable state securities laws or (ii) compliance with 
        applicable exemptions from registration under the Securities Act 
        and applicable state securities laws.  The Company may, if it 
        deems appropriate in its sole discretion, require an opinion of 
        counsel satisfactory to the Company that the offer, sale or 
        transfer of these shares is exempt from registration under the 
        Securities Act and applicable state securities laws.

                               ARTICLE 5

                    CERTAIN COVENANTS OF THE COMPANY

SECTION 5.1     RULE 144.  If at any time the Company is not subject to
Section 13 or 15(d) of the Exchange Act, the Company shall cause to be made
publicly available the information concerning the Company specified in
paragraphs (a)(5)(i) to (xiv), inclusive, and (xvi) of Rule 15c2-11 under the
Exchange Act.

SECTION 5.2     PRESS RELEASES; DISCLOSURES. Neither the Company nor the
Purchaser shall, without the prior written consent of the other, issue any 
press release or make any other public announcement or furnish any 
statement to any person or entity (other than either party's respective 
Affiliates, as that term is defined under the Securities Act) concerning 
the existence of this Agreement and the transactions contemplated by this 
Agreement except for (i) general statements referring to the existence of 
this Agreement, specifying its nature (Common Stock and Warrant Purchase), 
the identity of the parties but no other details, (ii) disclosures made in 
compliance with Section 4.1 (a) of the Collaboration and Option Agreement, 
dated as of October 30, 1998, by and between the Company and the Purchaser 
(the "Collaboration Agreement") or under any license agreement entered into 
under the Collaboration Agreement, (iii) attorneys, consultants and 
accountants retained to represent them in connection with the transactions 
contemplated hereby or as may be reasonably necessary to either party's 
bankers, investors, attorneys or other professional advisers in connection 
with a merger or acquisition, provided such advisors are bound by 
confidentiality obligations essentially identical to those set forth in 
Section 4.1 of the Collaboration Agreement or any license agreement entered 
into under the Collaboration Agreement, and (iv) occasional brief comments 
by the respective executive officers of both parties consistent with such 
guidelines for public statements as may be mutually agreed by the parties 
made in connection with routine interviews with analysts or members

                                -8-
<PAGE>9

of the financial press.  In addition, either party (after consultation with
counsel) in its own right may make such further announcements and 
disclosures, if any, as may be required by applicable securities laws and 
regulations (such as, without limitation, regulations of the SEC or the 
French Commission des Operations de Bourse (COB), or any equivalent 
authority of any country having jurisdiction), in which case the party 
making the announcement or disclosure shall use its best efforts to give 
advance notice to and discuss such announcement or disclosure with the 
other party and such other party's attorneys.

                             ARTICLE 6

                        CLOSING DOCUMENTS

SECTION 6.1     COMPANY'S DOCUMENTS.  Simultaneously with the execution and
delivery of this Agreement, the Company has delivered a certificate of Seth 
I. Truwit, its corporate secretary, certifying as to (1): the Company's 
current Certificate of Incorporation, as amended, duly certified by the 
Secretary of State of the State of Delaware, and that the Company is duly 
incorporated, validly existing and in good standing under Delaware law, (2) 
the Company's current by-laws, as amended, (3) the resolution(s) adopted by 
the Board of Directors of the Company approving this Agreement, the 
issuance of the Shares and the Warrant and the transactions contemplated 
hereby and thereby, and (4) a legal opinion from Epstein Becker & Green, PC 
in a form reasonably satisfactory to the Purchaser.

SECTION 6.2     PURCHASER'S DOCUMENTS.  Simultaneously with the execution and
delivery of this Agreement, Purchaser has delivered to the Company a 
certificate of its corporate secretary, certifying as to (1): the Company's 
current Certificate of Incorporation, as amended, duly certified by the 
appropriate regulatory authority of France, (2) the Purchaser's current by-
laws, as amended, and (3) the power of attorney executed by the Chairman of 
the  Purchaser appointing certain individuals to execute this Agreement and 
the Registration Rights Agreement and the transactions contemplated hereby 
and thereby.

                             ARTICLE 7

                           MISCELLANEOUS

SECTION 7.1     FEES AND EXPENSES.  Each party to this Agreement shall bear and
pay all fees, costs and expenses (including legal fees and accounting fees) 
that have been incurred or that are incurred by such party in correction 
with the transactions contemplated by this Agreement, including all fees, 
costs and expenses incurred by such party in connection with or by virtue 
of (a) the investigation and review conducted by the Purchaser with respect 
to the Company's business (and the furnishing of information to the 
Purchaser in connection with such investigation and review), (b) the 
negotiation, preparation and review of this Agreement (including the 
Disclosure Schedule) and all agreements, certificates, opinions and other 
instruments and documents delivered or to be delivered in connection with 
the transactions contemplated by this Agreement, (c) the preparation and 
submission of any filing or notice required to be made or given in 
connection with any of the transactions contemplated by this

                                -9-
<PAGE>10

Agreement, and the obtaining of any consent required to be obtained in
connection with any of such transactions, and (d) the consummation of the
transactions contemplated by this Agreement.

SECTION 7.2     GOVERNING LAW.  This Agreement shall be governed in all
respects by the laws of the State of New York.

SECTION 7.3     SURVIVAL.  The representations, warranties, covenants and
agreements made herein shall survive any investigation made by the 
Purchaser and the closing of the transactions contemplated hereby for a 
period of two years from the date hereof, except those contained in Section 
5.1 shall survive until the Purchaser no longer holds any Shares and those 
contained in Section 5.2 shall survive until the Purchaser is no longer 
deemed, under Section 13(d) of the Exchange Act, to own beneficially more 
than 5% of the Common Stock of the Company.

SECTION 7.4     SUCCESSORS AND ASSIGNS.  Except as otherwise expressly
provided herein, the provisions hereof shall inure to the benefit of, and
be binding upon, the successors, assigns, heirs, executors and administrators
of the parties hereto and shall inure to the benefit of and be enforceable by
each person who shall be a holder of the Shares or Warrant (or shares of
Common Stock issuable upon exercise of the Warrant) from time to time.

SECTON 7.5      ENTIRE AGREEMENT.  This Agreement and the other documents
delivered pursuant hereto constitute the full and entire understanding and 
agreement between the parties with regard to the subjects hereof and no 
party shall be liable or bound to any other in any manner by any 
representations, warranties, covenants and agreements except as 
specifically set forth herein and therein.

SECTION 7.6     SEVERABILITY.  In the event that any provision of this
Agreement, or the application of any such provision to any person or entity
or set of circumstances, shall be determined to be invalid, unlawful, void or
unenforceable to any extent, the remainder of this Agreement, and the 
application of such provision to persons or entities or circumstances other 
than those as to which it is determined to be invalid, unlawful, void or 
unenforceable, shall not be impaired or otherwise affected and shall 
continue to be valid and enforceable to the fullest extent permitted by 
law.
                               -10-
<PAGE>11

SECTION 7.7     NOTICES.

(a)	All notices, requests, demands and other communications hereunder
shall be in writing and shall be either (i) delivered by hand, (ii) mailed 
by registered or certified mail, return receipt requested, (iii) sent by 
overnight courier service, or (iv) sent by facsimile (with a confirming 
copy delivered as specified in any of the preceding clauses (i), (ii) or 
(iii)), to the parties addressed as follows:

        If to Purchaser:
        ---------------
        Pasteur Merieux Serums & Vaccins, S.A.
        58, avenue Leclerc
        69007 Lyon, France
        Telecopy No:  011 33 4 72 73 77 84
        Attention:  Senior Vice President, Legal and Corporate Affairs

        with copies to:

        Pasteur Merieux Connaught - USA
        Route 611
        Swiftwater, PA  18370
        Telecopy No:  (717) 839-4600
        Attention:  Vice President, Business Development 

        and

        L. Kevin O'Mara, Jr., Esq.
        Akin, Gump, Strauss, Hauer & Feld, L.L.P.
        590 Madison Avenue
        New York, NY  10022
        Telecopy No:  (212) 872-1002


                               -11-
<PAGE>12

        If to the Company:
        -----------------

        Cistron Biotechnology, Inc. 
        10 Bloomfield Avenue 
        Pine Brook, NJ  07058
        Telecopy Number:  (973) 575-4054 
        Attention: President

        With a copy to:

        Seth I. Truwit, Esq.
        Epstein Becker & Green, PC 
        250 Park Avenue
        New York, NY  10177
        Telecopy Number:  (212) 661-0989 

(b)     All notices, requests, instructions or documents given to any 
party in accordance with this Section shall be deemed to have been given 
(i) on the date of receipt, if delivered by hand, sent by overnight courier 
service, or sent by facsimile or (ii) on the date which is seven business 
days after delivery to the United States Postal Service, if mailed in the 
manner prescribed above.  Any party hereto may change its address specified 
for notices herein by designating a new address for such notices by a notice 
given in accordance with this Section.

SECTION 7.8     REMEDIES CUMULATIVE; SPECIFIC PERFORMANCE.  The rights and
remedies of the parties hereto shall be cumulative (and not alternative).  
The parties to this Agreement agree that, in the event of any breach or 
threatened breach by any party to this Agreement of any covenant, 
obligation or other provision set forth in this Agreement for the benefit 
of any other party to this Agreement, such other party shall be entitled 
(in addition to any other remedy that may be available to it) to (a) a 
decree or order of specific performance or mandamus to enforce the 
observance and performance of such covenant, obligation or other provision, 
and (b) an injunction restraining such breach or threatened breach.

SECTION 7.9     WAIVER.  No failure on the part of any party to exercise any
power, right, privilege or remedy under this Agreement, and no delay on the 
part of any party in exercising any power, right, privilege or remedy under 
this Agreement, shall operate as a waiver of such power, right, privilege 
or remedy; and no single or partial exercise of any such power, right, 
privilege or remedy shall preclude any other or further exercise thereof or 
of any other power, right, privilege or remedy.  No party shall be deemed 
to have waived any claim arising out of this Agreement, or any power, 
right, privilege or remedy under this Agreement, unless the waiver of such 
claim, power, right, privilege or remedy is expressly set forth in a 
written instrument duly executed and delivered on behalf of such party; and 
any such waiver shall not be applicable or have any effect except in the 
specific instance in which it is given.

SECTION 7.10    AMENDMENTS.  This Agreement may not be amended, modified,
altered or supplemented other than by means of a written instrument duly
executed and delivered on behalf of all of the parties hereto.

                              -12-
<PAGE>13

SECTION 7.11    HEADINGS.  The headings contained in this Agreement are for
convenience of reference only and are not to be considered in construing 
this Agreement.

SECTION 7.12    COUNTERPARTS.  This Agreement may be executed in several
counterparts, each of which shall constitute an original and all of which, 
when taken together, shall constitute one agreement.

                          [SIGNATURES ON NEXT PAGE]

                                     -13-
<PAGE>14

IN WITNESS WHEREOF, the parties hereto have executed this COMMON STOCK AND
WARRANT PURCHASE AGREEMENT as of the date set forth in the first paragraph 
hereof.


COMPANY:                             PURCHASER:

CISTRON BIOTECHNOLOGY, INC.          PASTEUR MERIEUX SERUMS & VACCINS, S.A.



By: /s/BRUCE C. GALTON               By: /s/DAVID J. WILLIAMS
    ------------------                   ---------------------
Name: BRUCE C. GALTON                    Name: DAVID J. WILLIAMS
Title: Chairman of the Board             Title: President 
       and Chief Financial Officer              and Chief Operating Officer



                               -14-
<PAGE>15

Void after 5:00 P.M.                               Common Stock Warrant
New York Time                                      to Purchase 666,667 Shares 
October 29, 2001                                   of Common Stock of Cistron
                                                   Biotechnology, Inc.    

                                                          No. 3

                       CISTRON BIOTECHNOLOGY, INC.

                      Common Stock Purchase Warrant
                           __________________

                This Warrant is being issued pursuant to the 
        Common Stock and Warrant Purchase Agreement dated the 
        date hereof, between Cistron Biotechnology, Inc. and 
        the Holder and is issued subject to the terms of such 
        Common Stock and Warrant Purchase Agreement.  This 
        Warrant and the shares of Common Stock issuable upon 
        exercise of this Warrant have not been registered under 
        the Securities Act of 1933, as amended (the "Act"), and 
        may not be sold or otherwise disposed of except (a) to 
        a person who, in the opinion of counsel reasonably 
        acceptable to the Company, is a person to whom the 
        securities may be legally transferred without 
        registration and without delivery of a current 
        prospectus under the Act or (b) to a person upon 
        delivery of a prospectus or offering circular then 
        meeting the requirements of the Act relating to such 
        securities and the offering thereof for such sale or 
        disposition.
                           __________________


        This certifies that, FOR VALUE RECEIVED, PASTEUR MERIEUX SERUMS & 
VACCINS, S.A. or registered assigns (the "Holder"), is entitled to 
purchase, subject to the provisions of this Warrant, from CISTRON 
BIOTECHNOLOGY, INC., a Delaware corporation (the "Company"), 666,667 shares 
of the Company's common stock, $.01 par value (the "Common Stock"), at a 
price of $.25 per share at any time prior to 5:00 P.M., New York Time, on 
October 29, 2001, at which time this Warrant shall expire and become void.  
The number of shares of Common Stock to be received upon exercise of this 
Warrant and the price to be paid for each share of Common Stock are subject 
to possible adjustment from time to time as hereinafter set forth.  The 
shares of Common Stock or other securities or property deliverable upon 
such exercise as adjusted from time to time are hereinafter sometimes 
referred to as the "Warrant Shares" and the exercise price of a share of 
Common Stock in effect at any time and as adjusted from time to time is 
hereinafter sometimes referred to as the "Exercise Price."  Unless the 
context otherwise requires, the term "Warrant" as used herein includes this 
Warrant and any other warrant or warrants that may be issued pursuant to 
the provisions of this Warrant, whether upon transfer, assignment, partial 
exercise, divisions, combinations, exchange, or otherwise, and the term 
"Holder" includes any transferee or transferees or assignee or assignees of 
the Holder named above, all of whom shall be subject to the provisions of 
this Warrant, and, when used with reference to Warrant Shares, means the 
holder or holders of such Warrant Shares.

        Section 1.      Exercise of Warrant.
                        --------------------

                1.1.    Method of Exercise.  This Warrant may be exercised in
whole or in part, but for not less than 50,000 Warrant Shares or the 
balance then exercisable, at any time by the Holder prior to 5:00 P.M., New 
York Time, on October 29, 2001, by presentation and surrender hereof to the 
Company at its

                                 -15-
<PAGE>16

principal office with the Subscription Form annexed hereto, duly executed
and accompanied by payment, by certified or official bank checks payable to
the order of the Company, of the Exercise Price for the total number of
Warrant Shares purchased.

                1.2.    Delivery of Shares.  Upon proper exercise of this 
Warrant, the Company promptly shall deliver certificates for the Warrant 
Shares to the Holder duly legended as authorized in the Subscription Form.

                1.3.    Partial Exercise.  If this Warrant is exercised in 
part only, the Company shall, upon presentation of this Warrant upon such 
exercise, execute and deliver (with the certificate for the Warrant Shares 
purchased) a new Warrant evidencing the rights of the Holder hereof to 
purchase the balance of the Warrant Shares purchasable hereunder upon the 
same terms and conditions as herein set forth.

                1.4.  Fractional Shares.  No fractional shares or scrip 
representing fractional shares shall be issued upon exercise of this 
Warrant but, in lieu thereof, the Company shall round up to the next full 
share. 

        Section 2.      Exercise Price and Adjustments.
                        -------------------------------

                2.1.    The Exercise Price at which the Warrant Shares shall 
be purchasable shall be $.25 per share, subject to adjustment as follows:

                                (a) Stock Dividends.  If at any time after the
date of the issuance of this Warrant (i) the Company shall pay a stock 
dividend payable in shares of Common Stock or (ii) the number of shares of 
Common Stock shall have been increased by a subdivision or split-up of 
shares of Common Stock, then, on the date of the payment of such dividend 
or immediately after the effective date of subdivision or split-up, as the 
case may be, the number of shares to be delivered upon exercise of this 
Warrant will be increased so that the Holder will be entitled to receive 
the number of shares of Common Stock that such Holder would have owned 
immediately following such action had this Warrant been exercised 
immediately prior thereto, and the Exercise Price will be adjusted as 
provided below in paragraph (d).

                                (b) Combination of Common Stock. If the number
of shares of Common Stock outstanding at any time after the date of the 
issuance of this Warrant shall have been decreased by a combination of the 
outstanding shares of Common Stock, then,  immediately after the effective 
date of such combination, the number of shares of Common Stock to be 
delivered upon exercise of this Warrant will be decreased so that the 
Holder thereafter will be entitled to receive the number of shares of 
Common Stock that such Holder would have owned immediately following such 
action had this Warrant been exercised immediately prior thereto, and the 
Exercise Price will be adjusted as provided below in paragraph (d).

                                (c) Reorganization, etc.  If any capital 
reorganization of the Company, or any reclassification of the Common Stock, 
or any consolidation of the Company with or merger of the Company with or 
into any other person or any sale, lease or other transfer of all or 
substantially all of the assets of the Company to any other person, shall 
be effected in such a way that the holders of Common Stock shall be 
entitled to receive stock, other securities or assets (whether such stock, 
other securities or assets are issued or distributed by the Company or 
another person) with respect to or in exchange for Common Stock, then, upon 
exercise of this Warrant the Holder shall have the right to receive the 
kind and amount of stock, other securities or assets receivable upon such 
reorganization, reclassification, consolidation, merger or sale, lease or 
other transfer of all or substantially all the assets of the Company that 
such Holder would have been entitled to receive upon exercise of this 
Warrant had this Warrant been exercised immediately before such 
reorganization, reclassification, consolidation, merger or sale, lease or 
other transfer of all or substantially all the assets of the

                             -16-
<PAGE>17

Company, subject to adjustments that shall be as nearly equivalent as may be
practicable to the adjustments provided for in this Section 2.1.

                                (d) Exercise Price Adjustment.  Whenever the 
number  of Warrant Shares purchasable upon the exercise of the Warrant is 
adjusted as provided pursuant to this Section 2.1, the Exercise Price 
payable upon the exercise of this Warrant shall be adjusted by multiplying 
such Exercise Price immediately prior to such adjustment by a fraction, of 
which the numerator shall be the number of Warrant Shares purchasable upon 
the exercise of the Warrant immediately prior to such adjustment, and of 
which the denominator shall be the number of Warrant Shares purchasable 
immediately thereafter; provided that the Exercise Price for each Warrant 
Share shall in no event be less than the par value of such Warrant Share.

                2.2.    No Adjustment for Dividends.  Except as provided in 
Section 2.1, no adjustment in respect of any dividends shall be made during 
the term of this Warrant or upon the exercise of this Warrant.  
Notwithstanding any other provision hereof, no adjustments shall be made on 
Warrant Shares issuable on the exercise of this Warrant for any cash 
dividends paid or payable to holders of record of Common Stock prior to the 
date as of which the Holder shall be deemed to be the record holder of such 
Warrant Shares.

                2.3.    Notice of Adjustment.  Whenever the number of Warrant 
Shares or the Exercise Price of such Warrant Shares is adjusted, as herein 
provided, the Company shall promptly mail by first class, postage prepaid, 
to the Holder, notice of such adjustment or adjustments and a certificate 
of a firm of independent public accountants of recognized standing selected 
by the Board of Directors of the Company (who are the independent public 
accountants regularly employed by the Company) setting forth the number of 
Warrant Shares and the Exercise Price of such Warrant Shares after such 
adjustment, setting forth a brief statement of the facts requiring such 
adjustment and setting forth the computation by which such adjustment was 
made.

                2.4.    Amendments.  Any provision of this Warrant may be 
amended and the observance thereof waived only with the written consent of 
the company and the Holder.

                2.5.    Cashless Exercise.  On any date on which this Warrant 
is exercisable, in lieu of the payment of the Exercise Price, the Holder 
shall have the right (the "Cashless Exercise Right") (but not the 
obligation), to require the Company to convert this Warrant, in whole or in 
part, into Common Stock in accordance with Section 1, and to require the 
Company to deliver to the Holder (without payment by the Holder of any of 
the Exercise Price) and in accordance with Section 1 that amount of Common 
Stock, equal to the quotient obtained by dividing (x) the value of the 
Warrant at the time the Cashless Exercise Right is exercised (determined by 
subtracting the aggregate Exercise Price in effect immediately prior to the 
exercise of the Cashless Exercise Right from the aggregate Fair Market 
Value for the shares of Stock covered by the Warrant immediately prior to 
the exercise of the Cashless Exercise Right) by (y) the Fair Market Value 
of one share of Common Stock immediately prior to the exercise of the 
Cashless Exercise Right.

                             (a) The Cashless Exercise Right may be exercised
by the Holder by delivering the Warrant, with a duly executed Subscription 
Form with the conversion section completed, to the Company, exercising the 
Cashless Exercise Right and specifying the total percentage of this Warrant 
that will be exercised.

                             (b) Fair Market Value of one share of Common 
Stock as of a particular date shall mean the average of the closing bid and 
asked prices as they are reported on the principal exchange of the Common 
Stock for the twenty (20) trading days ending on the day preceding the date 
the Warrant is exercised.

                             -17-
<PAGE>18

        Section 3.      Exchange, Assignment, or Loss of Warrant.
                        -----------------------------------------

                3.1.    Exchange of Warrant.  This Warrant is exchangeable, 
without expense, at the option of the Holder, upon presentation and 
surrender hereof to the Company for other Warrants of different 
denominations entitling the Holder thereof to purchase in the aggregate the 
same number of Warrant Shares purchasable hereunder on the same terms and 
conditions as herein set forth.

                3.2.    Assignment of Warrant.  Subject to compliance with 
Section 4 hereof, this Warrant may be assigned by presentation and 
surrender to the Company at its principal office or at the office of its 
stock transfer agent, if any, with the Assignment Form annexed hereto duly 
executed accompanied by funds sufficient to pay any transfer tax.  Upon 
such presentation and surrender, the Company shall, without charge, execute 
and deliver a new Warrant in the name of the assignee named in the 
Assignment Form and shall promptly cancel this Warrant.

                3.3.    Loss or Mutilation of Warrant.  Upon receipt by the 
Company of evidence satisfactory to it of the loss, theft, destruction, or 
mutilation of this Warrant, and (in the case of loss, theft, or 
destruction) of reasonably satisfactory indemnification, and upon surrender 
and cancellation of this Warrant, if mutilated, the Company will execute 
and deliver a new Warrant of like tenor and date and any such lost, stolen, 
or destroyed Warrant shall thereupon become void.  Any such new Warrant 
executed and delivered shall constitute an additional contractual 
obligation on the part of the Company, whether or not this Warrant so lost, 
stolen, destroyed, or mutilated shall be at any time enforceable by anyone.

                3.4.    Ownership of Warrant.  The Company may deem and treat 
the person in whose name this Warrant is registered as the holder and owner 
hereof (notwithstanding any notations of ownership or writing hereon made 
by anyone other than the Company) for all purposes and shall not be 
affected  by any notice to the contrary.

        Section 4.      Compliance with Securities Act of 1933.
                        ---------------------------------------

                4.1.    Disposition of Warrant and/or Warrant Shares.  This 
Warrant and/or the Warrant Shares may not be sold or otherwise disposed of 
except as follows:

                        (a)  To a person who, in the opinion of counsel 
        reasonably satisfactory to the Company, is a person to whom this 
        Warrant or the Warrant Shares may legally be transferred without 
        registration and without the delivery of a current prospectus 
        under the Act with respect thereto and then only against receipt 
        of an agreement of such person to comply with the provisions of 
        this Section 4 with respect to any resale or other disposition of 
        such securities unless, in the opinion of counsel, such agreement 
        is not required; or

                        (b)  To any person upon delivery of a prospectus or 
        offering circular then meeting the requirements of the Act 
        relating to such securities and the offering thereof for such 
        sale or disposition.

                4.2.    Legending of Certificates.  Each certificate for 
Warrant Shares or for any other security issued or issuable upon exercise 
of this Warrant shall contain a legend on the face thereof, in form and 
substance satisfactory to counsel to the Company, setting forth the 
restrictions on transfer thereof contained in this Section 4.

                                  -18-
<PAGE>19

        Section 5.      Company Covenants.
                        ------------------

                5.1.    Reservation and Issuance of Warrant Shares.  The
Company hereby undertakes until expiration of this Warrant to reserve for 
issuance and/or delivery upon exercise of this Warrant, such number of 
shares of its Common Stock as shall be required for issuance and/or 
delivery upon exercise hereon in full and agrees that all Warrant Shares so 
issued and/or delivered will be validly issued, fully paid, and non-
assessable and further agrees to pay all taxes and charges that may be 
imposed upon such issuance and/or delivery.

                5.2.    Officer's Certificate.  In the event the Exercise 
Price shall be adjusted as required by Section 2 hereof, the Company shall 
mail to the Holder an officer's certificate setting forth the adjustments 
so required and including, in reasonable detail, the method of calculating 
the adjustments and the transaction requiring the adjustment.

                5.3.    Notices of Corporate Action.  So long this Warrant 
has not been exercised in full, in the event of

                             (a) any taking by the Company of a record of the 
holders of any class of securities for the purpose of determining the 
holders thereof who are entitled to receive any dividend or other 
distribution, or any right to subscribe for, purchase or otherwise acquire 
any shares of Common Stock of any class or any other securities or 
property, or to receive any other right,

                             (b) any capital reorganization of the Company, 
any reclassification or recapitalization of the capital stock of the 
Company or any consolidation or merger involving the Company and any other 
person or any transfer of all or substantially all the assets of the 
Company to any other person, or

                             (c) any voluntary or involuntary dissolution, 
liquidation or winding-up of the Company, the Company will mail to the 
Holder a notice specifying (i) the date or expected date on which any such 
record is to be taken for the purpose of such dividend, distribution or 
right and the amount and character of any such dividend, distribution or 
right and (ii) the date or expected date on which any such reorganization, 
reclassification, recapitalization, consolidation, merger, transfer, 
dissolution, liquidation or winding-up is to take place and the time, if 
any such time is to be fixed, as of which the holders of record of Common 
Stock (or other securities) shall be entitled to exchange their shares of 
Common Stock (or other securities) for the securities or other property 
deliverable upon such reorganization, reclassification, recapitalization, 
consolidation, merger, transfer, dissolution, liquidation or winding-up.  
Such notice shall be delivered at least 10 days prior to the date therein 
specified, in the case of any date referred to in the foregoing 
subdivisions (i) and (ii).

        Section 6.      Miscellaneous.
                        --------------

                6.1.    Status of Holder.  The Holder shall not be entitled 
to vote or receive dividends and shall not otherwise be deemed a 
shareholder of the Company.

                6.2.    Notices.  All notices required hereunder shall be 
sent by first-class mail, postage prepaid, and shall be addressed, if to 
the Holder, to the last known address furnished to the Company and if to 
the Company, to: Cistron Biotechnology, Inc., 10 Bloomfield Avenue, Pine 
Brook, New Jersey  07058, Attn: Bruce Galton, Chairman and Chief Executive 
Officer, unless another address is designated in writing by the Holder of 
the Company.

                               -19-
<PAGE>20
                6.3.    Binding Effect.  This Warrant shall be binding upon 
the Company, its successors, and/or assigns and upon the Holder.

                6.4.    Governing Law.  The validity, interpretation and 
performance of this Warrant shall be governed by the laws of the State of 
New York.

                6.5.    No Rights or Liabilities as Common Stockholder.  
Nothing contained in this Warrant shall be determined as conferring upon 
the Holder any rights as a stockholder of the Company or as imposing any 
liabilities on the Holder to purchase any securities whether such 
liabilities are asserted by the Company or by creditors or stockholders of 
the Company or otherwise.

		IN WITNESS WHEREOF, this Warrant has been duly executed by the 
Company under its corporate seal as of this 30th day of October 1998. 



                                            CISTRON BIOTECHNOLOGY, INC.  


                                            By:/s/BRUCE C. GALTON
                                               ------------------
                                            Name: BRUCE C. GALTON
                                            Title: Chairman of the Board
                                                   and Chief Executive Officer


ATTEST:

/s/ SETH I. TRUWIT, ESQ.
- ------------------------
Name: SETH I. TRUWIT, ESQ.

                              -20-
<PAGE>21

FORM OF ASSIGNMENT

                        (To be signed only upon such assignment)



		FOR VALUE RECEIVED, the undersigned hereby sells, 
assigns and transfers unto 
the right represented by the within Warrant to purchase, from 
CISTRON BIOTECHNOLOGY, INC. (the "Company"), shares of the Common 
Stock of the Company, to which the within Warrant relates, and 
appoints

attorney to transfer said right, with full power of substitution 
in the premises.

Dated:

							
                                         ______________________________
                                        (Signature must conform in all
                                         respects to name of holder as
                                         specified on the face of the 
                                         Warrant)                    


ATTEST:


_____________________________
Name:

                                -21-
<PAGE>22

FORM OF SUBSCRIPTION

                        (To be signed only upon exercise of Warrant)



To:	CISTRON BIOTECHNOLOGY, INC.



		The undersigned, the holder of the within Warrant, hereby 
irrevocably elects to exercise the purchase rights represented by said 
Warrant for, and to purchase thereunder,      shares of Common Stock of the 
Company, and herewith makes payment of $               therefor, consents 
to the affixation of a legend on the certificate for such shares to the 
effect that such shares have not been registered under the Securities Act 
of 1933, as amended (the "Act"), and may be transferred only in compliance 
with the Act, and requests that such certificate(s) be issued in the name 
of and be delivered to

whose address is
and if such shares shall not be all of the shares purchased hereunder, that 
a new Warrant of like tenor for the balance of shares purchasable hereunder 
be delivered to the undersigned.

                Cashless Exercise Price Conversion Section

	By checking the following box the undersigned hereby irrevocably 
elects to exercise the Cashless Exercise Right in accordance with Section 2.5.


Dated:                                     _________________________________
                                           (Signature must conform in all
                                            respects to name of holder as
                                            specified on the face of the
                                            Warrant)

                                 -22-

<PAGE> 1
                        REGISTRATION RIGHTS AGREEMENT


        THIS AGREEMENT, dated as of October 30, 1998, is entered
into by and among Cistron Biotechnology, Inc., a corporation 
organized under the laws of Delaware (the "Company") and Pasteur 
Merieux Serums & Vaccins, S.A., a societe anonyme organized under 
the laws of France (the "Shareholder").

                             W I T N E S S E T H:

        WHEREAS, on the date hereof, the Company and the 
Shareholder are entering into a Common Stock and Warrant Purchase 
Agreement (the "Common Stock and Warrant Purchase Agreement"), 
relating to the Shareholder's investment in the Company; and

        WHEREAS, the Company, as partial inducement for the
Shareholder to enter into the Common Stock and Warrant Purchase 
Agreement, has elected to grant to the Shareholder the 
registration rights provided for herein.

        NOW, THEREFORE, in consideration of the premises, mutual
covenants and agreements herein contained and for other good and 
valuable consideration, the receipt and adequacy of which are 
hereby acknowledged, the parties hereto hereby agree as follows:

ARTICLE 1. Certain Definitions.
           --------------------

           (a) For the purposes of this Agreement, the following
terms shall have the respective meanings set forth below:

        "Advice" is as defined in Section 2.5.

        "Agreement" means this Agreement, as from time to time
assigned, supplemented, amended or modified in accordance with the 
terms hereof.

        "Common Stock and Warrant Purchase Agreement" is as defined
in the recitals.

        "Company" is as defined in the preamble.

        "Demand Registration" is as defined in Section 2.1.

        "Demand Request" is as defined in Section 2.1.

        "Exchange Act" means the United States Securities Exchange
Act of 1934, as amended, or any similar federal law then in force.

        "Indemnified Person" is as defined in Section 2.9(a).

        "Material Adverse Effect" is as defined in Section 2.3(a).

        "NASD" is as defined in Section 2.4(p).

        "Proposed Registration" is as defined in Section 2.2(a).

                                  -1-
<PAGE>2

        "Restricted Shares" means any Shares or other securities of
the Company which have not been registered under the Securities 
Act and which are owned by the Shareholder.

        "SEC" means the United States Securities and Exchange
Commission.

        "Securities Act" means the United States Securities Act of
1933, as amended, or any similar federal law then in force.

        "Shareholder" is as defined in the preamble.

        "Shares" means common stock of the Company, par value $.01
per share.

        "Suspension Notice" is as defined in Section 2.5.

           (b) Capitalized terms used herein but not defined
herein shall have the meaning set forth in the Common Stock and 
Warrant Purchase Agreement.

ARTICLE 2. Registration Rights.
           --------------------

            2.1. Demand Registration.  At any time after October 30,
2000 the Shareholder may require the Company (pursuant to a 
written notice to the Company) to effect the registration under 
the Securities Act of Shares of the Company (a "Demand 
Registration"). Such request (a "Demand Request") by the 
Shareholder shall (i) specify the class and number of Shares which 
the Shareholder intends to sell or dispose of, and (ii) state the 
intended method or methods by which the Shareholder intends to 
sell or dispose of such Shares.  In connection with any 
underwritten public offering, the underwriter thereof shall be 
selected by the Company, subject to the consent of the 
Shareholder, which shall not be unreasonably withheld.  Upon 
receipt of a Demand Request, the Company shall (as requested) (i) 
cause to be filed, within seventy-five (75) calendar days of the 
date of delivery to the Company of the request, a registration 
statement covering such Shares which the Company has been so 
requested to register, providing for the registration under the 
Securities Act of such Shares to the extent necessary to permit 
the disposition of such Shares so to be registered in accordance 
with the intended method of distribution specified in such request 
(provided, further, that in either case the Company may delay 
making such filing or taking such action by not more than sixty 
(60) calendar days if the Company, prior to the time it would 
otherwise have been required to file such registration statement 
or take such action, determines in good faith that the filing of 
such registration statement or the taking of such action would 
require the disclosure of material nonpublic information that, in 
the reasonable judgment of the Company, would be detrimental to 
the Company if so disclosed (and a delay would be likely to reduce 
the detrimental effect of such disclosure or obviate the need for 
such disclosure to be made), or would otherwise adversely affect a 
financing, acquisition, disposition, merger or other material 
transaction), and shall use its best efforts to have such 
registration statement declared effective by the SEC as soon as 
practicable thereafter. The Shareholder shall have the right to 
exercise up to one (1) such Demand Registration right.

            2.2. Piggyback Rights.
                 -----------------

             (a) Each time that the Company proposes (either
unilaterally or pursuant to the exercise of demand registration 
rights by any other third party) for any reason to register any of 
its securities under the Securities Act (a "Proposed 
Registration"), other than pursuant to a registration statement on 
Form F-4 or Form F-8 or similar or successor forms, the Company 
shall promptly give
                               -2-
<PAGE> 3

written notice of such Proposed Registration to the Shareholder
(which notice shall be given not less than thirty (30) calendar
days prior to the effective date of the Company's registration
statement) and such holders shall have the right, on a pro rata
basis, to request inclusion of any of the Shareholder's Shares
in the Proposed Registration.  No registration pursuant to this
Section 2.2 shall relieve the Company of its obligation to register
Shares pursuant to Section 2.1.

             (b) The Shareholder shall have twenty-five (25)
calendar days from the receipt of such notice to deliver to the 
Company a written request specifying the number of Shares the 
Shareholder intends to sell and the Shareholder's intended method 
of disposition.  The Shareholder shall have the right to withdraw 
its request for inclusion of such Shares in any registration 
statement pursuant to this Section 2.2 by giving written notice to 
the Company of such withdrawal.  Subject to Section 2.3 below, the 
Company shall include in such registration statement all such 
Shares so requested to be included therein; provided, however, 
that the Company may at any time withdraw or cease proceeding with 
any such piggyback registration if it shall at the same time 
withdraw or cease proceeding with the registration of all other 
equity securities originally proposed to be registered.

             (c) In the event that the Proposed Registration by the
Company is, in whole or in part, an underwritten public offering 
of securities of the Company, any request under Section 2.2(b) 
hereof must specify that the Shares be included in the 
underwriting on the same terms and conditions as the Shares 
otherwise being sold through underwriters under such registration.

            2.3. Priority on Registrations.
                 --------------------------

             (a) Notwithstanding the foregoing, if the Shares
requested to be included in the Proposed Registration pursuant to 
Section 2.2 hereof by the Shareholder differ from the type of 
securities proposed to be registered by the Company and the 
managing underwriter advises the Company that due to such 
differences the inclusion of such Shares would materially and 
adversely affect the price or success of the offering (a "Material 
Adverse Effect"), then (i) the number of the Shareholder' Shares 
to be included in the registration statement shall be reduced to 
an amount which, in the judgment of the managing underwriter, 
would eliminate such Material Adverse Effect or (ii) if no such 
reduction would, in the judgment of the managing underwriter, 
eliminate such Material Adverse Effect, then the Company shall 
have the right to exclude all such Shares from such registration 
statement provided no other securities of such type are included 
and offered for the account of any other person in such 
registration statement. Any partial reduction in the number of 
Shares to be included in the registration statement pursuant to 
clause (i) of the immediately preceding sentence shall be effected 
pro rata based on the ratio which the Shareholder's requested 
Shares bears to the total number of Shares requested to be 
included in such registration statement by all other persons who 
have requested that their Shares be included in such registration 
statement.  

           (b) If the Shares requested to be included in the
registration statement are of the same type as the securities 
being registered by the Company and the managing underwriter 
advises the Company that the inclusion of such Shares would cause 
a Material Adverse Effect, the Company will be obligated to 
include in such registration statement, as to the Shareholder 
(subject to the priority rules set forth below), the greater of 
(i) that portion of the Shares the Shareholder has requested be 
registered which the managing underwriter believes may be included 
(together with only securities to be offered by the Company) 
without causing a Material Adverse Effect, or (ii) that portion of 
the Shares the Shareholder has requested to be registered equal to 
the ratio which the Shareholder's requested Shares bears to the 
total number of Shares requested to be included in such 
registration statement by all other persons (other than (i) the 
Company, if such registration has been

                             -3-
<PAGE> 4

initiated by the Company for securities to be offered by the Company
or (ii) the Shareholder, if such registration has been initiated by it 
pursuant to Section 2.1 hereof) who have requested that their 
Shares be included in such registration statement.  It is 
acknowledged by the Shareholder that pursuant to the foregoing 
provision, the securities to be included in such registration 
shall be allocated (A) if the Company initiates the Proposed 
Registration (either unilaterally or pursuant to the exercise of 
demand registration rights by any other third party), (1) first, 
to the Company or such other third party exercising demand 
registration rights, (2) second, to the Shareholder (in accordance 
with the above described ratio if all Shares proposed to be 
included in the Proposed Registration cannot be so included) and 
(3) third, to all other persons requesting securities to be 
included therein (in accordance with the above described ratio if 
all Shares proposed to be included in the Proposed Registration 
cannot be so included) and  (B) if the Shareholder exercises a 
right to cause a Demand Registration, (1) first, to the 
Shareholder and (2) second, to all other persons requesting 
securities to be included therein (in accordance with the above 
described ratio if all Shares proposed to be included in the 
Proposed Registration cannot be so included).  If as a result of 
the provisions of this Section 2.3(b) the Shareholder shall not be 
entitled to include all of its Shares in a registration that the 
Shareholder has requested to be so included, the Shareholder may 
withdraw the Shareholder's request to include Shares in such 
registration statement.  The Shares that are excluded from the 
underwritten public offering pursuant to the preceding sentence 
shall be withheld from the market by the Shareholder for a period, 
not to exceed one hundred eighty (180) calendar days from the 
closing of such underwritten public offering, that the managing 
underwriter(s) determines as necessary in order to effect such 
underwritten public offering.  In granting any future registration 
rights the Company will include the priority of registration 
herein.

           (c)  The Shareholder may not participate in any
registration statement hereunder unless the Shareholder completes, 
executes and delivers all questionnaires, powers of attorney, 
indemnities, underwriting agreements, and other documents 
reasonably required under the terms of such underwriting 
arrangements, including an opinion of its counsel; provided, 
however, that the Shareholder shall not be required to make any 
representations or warranties in connection with any such 
registration other than representations and warranties as to (i) 
the Shareholder's ownership of its Shares to be sold or 
transferred free and clear of all liens, (ii) the Shareholder's 
power and authority to effect such transfer, and (iii) such 
matters pertaining to compliance with securities laws as may be 
reasonably requested.

            2.4. Registration Procedures.  Whenever the Shareholder
has requested that any Shares be registered pursuant to the 
provisions of this Article 2, the Company will use its 
commercially reasonable efforts to effect the registration and the 
sale of such Shares in accordance with the intended method of 
disposition thereof as set forth in the written request, and 
pursuant thereto the Company shall:  

             (a) prepare and file with the SEC a registration
statement with respect to such securities on the appropriate 
forms, and use its best efforts to cause such registration 
statement(s) to become and remain effective in accordance with 
Section 2.4(b) hereof and in accordance with all laws, rules and 
regulations applicable thereto; 

             (b) prepare and file with the SEC such amendments and
supplements to such registration statements and the prospectus 
used in connection therewith as may be necessary to keep such 
registration statement effective until the earlier of (i) the sale 
of all Shares covered thereby or (ii) the expiration of nine 
months from the effective date of the registration statement, and to

                              -4-
<PAGE>5

comply with the provisions of the Securities Act with respect
to the sale or other disposition of all Shares covered by such 
registration statement; 

             (c) furnish to the Shareholder pursuant to Section 2.1
or Section 2.2 such number of copies of any summary prospectus or 
other prospectus, including a preliminary prospectus, in 
conformity with the requirements of the Securities Act, and such 
other documents as the Shareholder may reasonably request in order 
to facilitate the public sale or other disposition of such Shares;

             (d) use its best efforts to register or qualify the
Shares covered by such registration statement under the securities 
or blue sky laws of such jurisdictions as the Shareholder shall 
reasonably request and do any and all other acts or things which 
may be necessary or advisable to enable the Shareholder to 
consummate the public sale or other disposition in such 
jurisdictions of such Shares; provided, however, that the Company 
shall not be required to consent to general service of process for 
all purposes in any jurisdiction where it is not then subject to 
process, qualify to do business as a foreign company where it 
would not be otherwise required to qualify or submit to liability 
for state or local taxes where it is not otherwise liable for such 
taxes;

             (e) at any time when a prospectus relating thereto
covered by such registration statement is required to be delivered 
under the Securities Act within the appropriate period mentioned 
in Section 2.4(b) hereof, promptly notify the Shareholder and each 
underwriter and (if requested by the Shareholder) confirm such 
notice in writing (i) when a prospectus or any prospectus 
supplement or post-effective amendment has been filed and, with 
respect to a registration statement or any post-effective 
amendment, when the same has become effective, (ii) of the 
issuance by any state securities or other regulatory authority of 
any order suspending the qualification or exemption from 
qualification of any of the Shares under state securities or blue 
sky laws or the initiation of any proceedings for that purpose, 
and (iii) of the happening of any event as a result of which the 
prospectus included in such registration, as then in effect, 
includes an untrue statement of a material fact or omits to state 
a material fact required to be stated therein or necessary to make 
the statements therein not misleading in light of the 
circumstances then existing and, at the request of the  
Shareholder, prepare, file and furnish to the Shareholder a 
reasonable number of copies of a supplement to or an amendment of 
such prospectus as may be necessary so that, as thereafter 
delivered to the purchasers of such shares, such prospectus shall 
not include an untrue statement of a material fact or omit to 
state a material fact required to be stated therein or necessary 
to make the statements therein not misleading in the light of the 
circumstances then existing;

             (f) if the Company has delivered preliminary or final
prospectuses to the Shareholder and after having done so the 
prospectus is amended to comply with the requirements of the 
Securities Act, the Company shall promptly notify the Shareholder 
and, if requested, the Shareholder shall immediately cease making 
offers of Shares and return all prospectuses to the Company.  The 
Company shall promptly provide the Shareholder with revised 
prospectuses and, following receipt of the revised prospectuses, 
the Shareholder shall be free to resume making offers of the 
Shares; 

             (g) furnish, at the request of the Shareholder on the
date such Shares are delivered to the underwriters for sale in 
connection with a registration pursuant to this Article 2, if such 
securities are being sold through underwriters, or, if such 
securities are not being sold through underwriters, on the date 
that the registration statement with respect to such securities 
becomes effective, (i) an opinion, dated such date, of the counsel 
representing the Company for the purposes

                             -5-
<PAGE>6

of such registration, in form and substance as is customarily given
to underwriters in an underwritten public offering, addressed to the
underwriters, if any, and to the Shareholder and (ii) a letter dated
such date, from the independent certified public accountants of the
Company, in form and substance as is customarily given by independent 
certified public accountants to underwriters in an underwritten 
public offering, addressed to the underwriters, if any, and the 
Shareholder;

             (h) if any proposed registration effected pursuant to
Section 2.1 or Section 2.2 involves an underwritten public 
offering, (i) subject to Section 2.1, select a reputable managing 
underwriter to underwrite such public offering, (ii) cause all 
Shares to be listed for trading on the principal national 
securities exchange where the Company's common stock is listed for 
trading, and (iii) enter into (A) an underwriting agreement with 
the underwriter providing for such representations, warranties, 
covenants, conditions and indemnities as may be requested by the 
underwriter and (B) a deposit agreement with a depositary, if 
applicable, providing for such representations, warranties, 
covenants, conditions and indemnities as may be requested by the 
depositary;

             (i) before filing a registration statement or amendment
thereto, furnish to each Shareholder and its counsel and other 
representatives and the underwriters, if any, copies of each such 
registration statement or amendment proposed to be filed, which 
documents shall be made available on a timely basis for review and 
comment by the Shareholder, the underwriters (if any) and their 
respective representatives;

             (j) make generally available to the Company's security
holders an earnings statement satisfying the provisions of Section 
11(a) of the Securities Act no later than thirty (30) calendar 
days after the end of the 12-month period beginning with the first 
day of the Company's first fiscal quarter commencing after the 
effective date of a registration statement, which earnings 
statement shall cover said 12-month period, and which requirement 
will be deemed to be satisfied if the Company timely files 
complete and accurate information on Forms 20-F and 6-K under the 
Exchange Act and otherwise complies with Rule 158 under the 
Securities Act;

             (k) if requested by the managing underwriter or the
Shareholder, promptly incorporate in a prospectus supplement or 
post-effective amendment such information as the managing 
underwriter or the Shareholder reasonably requests to be included 
therein, including, without limitation, with respect to the Shares 
being sold by the Shareholder, the purchase price being paid 
therefor by the underwriters and with respect to any other terms 
of the underwritten offering of the Shares to be sold in such 
offering, and promptly make all required filings of such 
prospectus supplement or post-effective amendment;

            (l) as promptly as practicable after filing with the
SEC of any document which is incorporated by reference into a 
registration statement (in the form in which it was incorporated), 
deliver a copy of each such document to the Shareholder;

             (m) cooperate with the Shareholder and the managing
underwriter to facilitate the timely preparation and delivery of 
certificates (which shall not bear any restrictive legends unless 
required under applicable law) representing securities sold under 
any registration statement (if any), and enable such securities to 
be in such denominations and registered in such names as the 
managing underwriter or such sellers may request and keep 
available and make available to the Company's transfer agent prior 
to the effectiveness of such registration statement a supply of 
such certificates;
                           -6-
<PAGE>7
             (n) in the event that the Shareholder may be considered
to be a "control person," promptly make available for inspection 
by the Shareholder, any underwriter participating in any 
disposition pursuant to any registration statement, and any 
attorney, accountant or other agent or representative retained by 
any the Shareholder or underwriter (collectively, the 
"Inspectors"), all financial and other records, pertinent 
corporate documents and properties of the Company (collectively, 
the "Records"), as shall be reasonably necessary to enable them to 
exercise their due diligence responsibility, and cause the 
Company's officers, directors and employees to supply all 
information requested by any such Inspector in connection with 
such registration statement; provided, that, unless the disclosure 
of such Records is necessary to avoid or correct a misstatement or 
omission in the registration statement or the release of such 
Records is ordered pursuant to a subpoena or other order from a 
court of competent jurisdiction, the Company shall not be required 
to provide any information under this subparagraph (n) if (i) the 
Company believes, after consultation with counsel for the Company, 
that to do so would cause the Company to forfeit an attorney-
client privilege that was applicable to such information or (ii) 
if either (A) the Company has requested and been granted from the 
SEC confidential treatment of such information contained in any 
filing with the SEC of documents provided supplementally or 
otherwise or (B) the Company reasonably determines in good faith 
that such Records are confidential and so notifies the Inspectors 
in writing unless prior to furnishing any such information with 
respect to (i) or (ii) the Shareholder requesting such information 
agrees to enter into a confidentiality agreement in customary form 
and subject to customary exceptions; and provided, further, that 
the Shareholder agrees that it will, upon learning that disclosure 
of such Records is sought in a court of competent jurisdiction, 
give notice to the Company and allow the Company at its expense, 
to undertake appropriate action and to prevent disclosure of the 
Records deemed confidential;

             (o) provide, if required, a CUSIP number for the Shares
included in any registration statement not later than the 
effective date of such registration statement;

             (p) cooperate with the Shareholder and each underwriter
participating in the disposition of such Shares and their 
respective counsel in connection with any filings required to be 
made with the National Association of Securities Dealers, Inc. 
("NASD");

             (q) during the period when the prospectus is required
to be delivered under the Securities Act, promptly file all 
documents required to be filed with the SEC pursuant to Sections 
13(a), 13(c), 14 or 15(d) of the Exchange Act;

             (r) notify the Shareholder promptly of any request by
the SEC for the amending or supplementing of such registration 
statement or prospectus or for additional information;

             (s) prepare and file with the SEC promptly any
amendments or supplements to such registration statement or 
prospectus which, in the opinion of counsel for the Company or the 
managing underwriter, is required in connection with the 
distribution of the Shares;

            (t) advise the Shareholder, promptly after it shall
have received notice or obtain knowledge thereof, of the issuance 
of any stop order by the SEC suspending the effectiveness of such 
registration statement or the initiation or threatening of any 
proceeding for such purpose and promptly use its best efforts to 
prevent the issuance of any stop order or to obtain its withdrawal 
at the earliest possible moment if such stop order should be 
issued; and
                          -7-
<PAGE>8
            (u) in the case of a Demand Request pursuant to Section
2.1 if the Shareholder so requests, to request acceleration of 
effectiveness of the registration statement from the SEC, provided 
at the time of such request the Company does not, in good faith, 
believe it is necessary to amend further the registration 
statement in order to comply with the provisions of this Section 
2.4.  If the Company wishes to further amend the registration 
statement prior to requesting acceleration, it shall have five (5) 
Business Days to so amend prior to requesting acceleration.

           2.5. Suspension of Dispositions.  The Shareholder agrees
that upon receipt of any notice (a "Suspension Notice") from the 
Company of the happening of any event of the kind described in 
Section 2.4(e)(iii), the Shareholder will forthwith discontinue 
disposition of Shares until the Shareholder's receipt of the 
copies of the supplemented or amended prospectus, or until it is 
advised in writing (the "Advice") by the Company that the use of 
the prospectus may be resumed, and has received copies of any 
additional or supplemental filings which are incorporated by 
reference in the prospectus, and, if so directed by the Company, 
the Shareholder will deliver to the Company all copies, other than 
permanent file copies then in the Shareholder's possession, of the 
prospectus covering such Shares current at the time of receipt of 
such Suspension Notice.  In the event the Company shall give any 
such Suspension Notice, the time period regarding the 
effectiveness of registration statements set forth in Section 
2.4(b) hereof shall be extended by the number of days during the 
period from and including the date of the giving of the Suspension 
Notice to and including the date when each seller of Shares 
covered by such registration statement shall have received the 
copies of the supplemented or amended prospectus or the Advice. 
The Company shall use its commercially reasonable efforts and take 
such actions as are reasonably necessary to render the Advice as 
promptly as practicable.

           2.6. Cooperation upon a Registration.  The Shareholder
and the Company agree that, in connection with any exercise of 
registration rights pursuant to this Article 2, the Shareholder 
will authorize, and will authorize and direct the Company to take, 
such actions as are necessary or appropriate to effectuate such 
registration.  In addition, the Shareholder agrees to cooperate 
fully with the Company and the underwriters of any underwritten 
public offering in the preparation of all documentation necessary 
or desirable to effectuate any registration of any Shares under 
the Securities Act pursuant to this Article 2, or registration or 
qualification of any Shares pursuant to Section 2.4(d) hereof.  In 
addition, the Company agrees to cooperate fully with the 
Shareholder in connection with any such registration or 
qualification.  

           2.7. Limitations.  Notwithstanding anything in this
Agreement to the contrary, if requested in writing by the managing 
underwriter(s), if any, of any underwritten public offering of the 
Company's capital stock pursuant to this Article 2, the 
Shareholder agrees not to offer, sell, contract to sell or 
otherwise dispose of any shares of capital stock of the Company 
except as part of such underwritten public offering within thirty 
(30) calendar days before or one hundred eighty (180) calendar 
days after the effective date of the registration statement filed 
with respect to said offering, unless expressly authorized to do 
so by the managing underwriter(s). 

           2.8. Expenses.  The Company shall pay all expenses
incurred by the Company in complying with Sections 2.1, 2.2 and 
2.4 hereof, including, without limitation, all registration and 
filing fees (including all expenses incident to filing with the 
NASD), fees and expenses of complying with the securities or blue 
sky laws of all such jurisdictions in which the Shares are 
proposed to be offered and sold (including reasonable fees and 
disbursements of counsel in connection with blue sky qualification 
of Shares), rating agency fees, printing expenses, messenger and 
delivery expenses, the Company's internal expenses (including 
without limitation all salaries

                              -8-
<PAGE>9

and expenses of its officers and employees performing legal or
accounting duties), fees and expenses incurred in connection with
any listing of the Shares, fees and expenses of counsel for the
Company and its independent certified public accountants (including
the expenses of any special audit or cold comfort letters required by
or incident to such performance), securities act liability insurance
(if the Company elects to obtain such insurance) and fees and 
disbursements of underwriters (to the extent the Company is liable 
therefor under the terms of any underwriting agreement), whether 
or not any registration statement becomes effective; provided, 
however, that all underwriting discounts and selling commissions 
applicable to the Shares covered by registrations effected 
pursuant to Section 2.1 or Section 2.2 hereof shall be borne by 
the Shareholder, in proportion to the number of Shares sold by the 
Shareholder, and except as expressly provided in this Section 2.8, 
in no event shall the Company pay any fees or expenses 
attributable to any counsel, accountants or other persons retained 
or employed by the Shareholder.

           2.9. Indemification.
                ---------------

            (a) In the event of any registration of any Shares
under the Securities Act pursuant to this Article 2 or 
registration or qualification of any Shares pursuant to Section 
2.4(d) hereof, the Company shall indemnify and hold harmless the 
Shareholder, each underwriter of such shares, if any, each broker 
or any other person acting on behalf of the Shareholders, each 
director, officer, employee and partner of any of the foregoing 
and each other person, if any, who controls any of the foregoing 
persons, within the meaning of the Securities Act (each, an 
"Indemnified Person"), against any losses, claims, damages, 
liabilities or expenses, joint or several, to which any of the 
foregoing persons may become subject under the Securities Act or 
otherwise, insofar as such losses, claims, damages or liabilities 
(or actions in respect thereof) arise out of, are related to, 
result from or are based upon an untrue statement or alleged 
untrue statement of a material fact contained in any registration 
statement under which such Shares were registered under the 
Securities Act, any preliminary prospectus or final prospectus 
contained therein, or any amendment or supplement thereto, or any 
document incident to registration or qualification of any Shares 
pursuant to Section 2.4(d) hereof, or arise out of, are related 
to, result from or are based upon the omission or alleged omission 
to state therein a material fact required to be stated therein or 
necessary to make the statements therein not misleading or, with 
respect to any prospectus, necessary to make the statements 
therein, in light of the circumstances under which they were made, 
not misleading, or any violation by the Company of the state 
securities or blue sky laws applicable to the Company and relating 
to action or inaction required of the Company in connection with 
such registration or qualification under such state securities or 
blue sky laws.  The Company shall reimburse on demand each 
Indemnified Person for any legal or any other costs and expenses 
reasonably incurred by any of them in connection with 
investigating, preparing for, defending or settling any such loss, 
claim, damage, liability or action by any governmental agency or 
body; provided, however, that the Company shall not be liable in 
any such case to the extent that any such loss, claim, damage, 
liability or expense arises out of or is based upon an untrue 
statement or alleged untrue statement or omission or alleged 
omission made in said registration statement, preliminary or final 
prospectus or amendment or supplement thereto or any document 
incident to registration or qualification of any Shares pursuant 
to Section 2.4(d) hereof, in reliance upon and in conformity with 
written information furnished to the Company by the Shareholder, 
underwriter, broker, other person or controlling person 
specifically for use in the preparation thereof or arises out of 
or is based upon the Indemnified Person's failure to deliver a 
copy of the registration statement or prospectus or any amendments 
or supplements thereto after the Company has furnished such 
Indemnified Person with a sufficient number of copies of the same.

                             -9-
<PAGE>10
            (b) Before Shares shall be included in any registration
pursuant to this Article 2, the Shareholder will furnish to the 
Company in writing such information and affidavits as the Company 
reasonably requests for use in connection with any such 
registration statement and prospectus, and the Shareholder and any 
underwriter acting on its behalf shall have agreed to indemnify 
and hold harmless (in the same manner and to the same extent as 
set forth in paragraph (a) above) the Company, each member of the 
Board of Directors of the Company, each officer of the Company who 
signs such registration statement, every other participating 
shareholder and any person who controls the Company within the 
meaning of the Securities Act, with respect to any untrue 
statement or omission from such registration statement, any 
preliminary prospectus or final prospectus contained therein, or 
any amendment or supplement thereto, if such untrue statement or 
omission was made in reliance upon and in conformity with such 
written information furnished to the Company by the Shareholder or 
such underwriter for use in the preparation of such registration 
statement, preliminary prospectus, final prospectus or amendment 
or supplement; provided, however, that the maximum amount of 
liability in respect of such indemnification shall be limited to 
an amount equal to the net proceeds actually received by the 
Shareholder from the sale of Shares effected pursuant to such 
registration.

            (c) Promptly after receipt by an Indemnified Person of
notice of the commencement of any action involving a claim 
referred to in Section 2.9(a) or (b) hereof, such Indemnified 
Person will, if a claim in respect thereof is to be made against 
the indemnifying party under this Section 2.9, give written notice 
to the latter of the commencement of such action (provided that 
the failure to give such notice shall not limit the rights of such 
Indemnified Person to the extent that such failure or delay in 
notifying the indemnifying party does not prevent the indemnifying 
party from presenting a proper defense against the claim).  In 
case any such action is brought against an Indemnified Person, the 
indemnifying party will be entitled to participate in and to 
assume the defense thereof, jointly with any other indemnifying 
party similarly notified to the extent that it may wish, with 
counsel reasonably satisfactory to such Indemnified Person, and, 
after notice to such Indemnified Person from the indemnifying 
party of its election to assume the defense thereof; provided, 
however, that, if any Indemnified Person shall have reasonably 
concluded that there may be one or more legal defenses available 
to such Indemnified Person which are different from, in conflict 
with or additional to those available to the indemnifying party, 
or that such claim or litigation involves or could have an effect 
upon matters beyond the scope of the indemnity agreement provided 
in this Section 2.9, or if the indemnifying party fails to take 
diligent action to defend such claim within twenty (20) calendar 
days following notice thereof from the Indemnified Person, the 
indemnifying party shall not have the right to assume the defense 
of such action on behalf of such Indemnified Person, and such 
indemnifying party shall reimburse such Indemnified Person and any 
person controlling such Indemnified Person for the fees and 
expenses of counsel retained by the Indemnified Person which are 
reasonably related to the matters covered by the indemnity 
agreement provided in this Section 2.9.  If the indemnifying party 
does assume its own defense as permitted hereunder, from such time 
the Indemnified Person shall bear the expenses of its own separate 
counsel.  If such defense is not assumed by the indemnifying party 
as permitted hereunder, the indemnifying party will not be subject 
to any liability for any settlement made by the Indemnified Person 
without its written consent, which consent shall not be 
unreasonably withheld.  If such defense is assumed by the 
indemnifying party pursuant to the provisions hereof, such 
indemnifying party shall not make any settlement of the applicable 
claim indemnified against hereunder without the written consent of 
the Indemnified Person or persons, which consent shall not be 
unreasonably withheld.  An indemnifying party who is not entitled 
to, or elects not to, assume the defense of a claim will not be 
obligated to pay the fees and expenses of more than one counsel 
for all parties indemnified by such indemnifying party with 
respect to such claim, unless in the 

                            -10-
<PAGE>11

reasonable judgment of any Indemnified Person, a conflict
of interest may exist between such Indemnified Person and any
other such Indemnified Person with respect to such claim, in
which event the indemnifying party shall be obligated to pay the
reasonable fees and disbursements of such additional counsel or
counsels.

            (d) In order to provide for just and equitable
contribution to joint liability under the Securities Act in any 
case in which an Indemnified Person makes a claim for 
indemnification pursuant to this Section 2.9, but it is judicially 
determined (by the entry of a final judgment or decree by a court 
of competent jurisdiction and the expiration of time to appeal or 
the denial of the last right of appeal) that such indemnification 
may not be enforced in such case notwithstanding the fact that 
this Section 2.9 provides for indemnification in such case, then 
the Company and the Shareholder will contribute to the aggregate 
losses, claims, damages or liabilities to which they may be 
subject as is appropriate to reflect, as between the Company and 
the Shareholder, on the one hand, and the underwriter on the other 
hand, the relative fault of the Company and the Shareholder in 
connection with the statements or omissions which resulted in such 
losses, claims, damages or liabilities, it being understood that 
the parties acknowledge that the overriding equitable 
consideration to be given effect in connection with this provision 
is the ability of one party or the other to correct the statement 
or omission which resulted in such losses, claims, damages or 
liabilities, and that it would not be just and equitable if 
contribution pursuant hereto were to be determined by pro rata 
allocation or by any other method of allocation which does not 
take into consideration the foregoing equitable considerations.  
Notwithstanding the foregoing, (i) the Shareholder will not be 
required to contribute any amount in excess of the net proceeds to 
it of all Shares sold by it pursuant to such registration 
statement, (ii) no underwriter shall be required to contribute any 
amount in excess of the proceeds to it from the offering pursuant 
to such registration statement, and (iii) no person guilty of 
fraudulent misrepresentation, within the meaning of Section 11(f) 
of the Securities Act, shall be entitled to contribution from any 
person who is not guilty of such fraudulent misrepresentation.  If 
indemnification is available under this Section 2.9, the 
indemnifying parties shall indemnify each Indemnified Person to 
the full extent provided in Section 2.9(a) and Section 2.9(b) 
without regard to the relative fault of said indemnifying party or 
Indemnified Person or any other equitable consideration provided 
for in this Section 2.9(d).

           (e) Notwithstanding any of the foregoing, if in
connection with an underwritten public offering of any Shares, the 
Company, the Shareholder and the underwriters enter into an 
underwriting or purchase agreement relating to such offering which 
contains provisions covering indemnification among the parties, 
the indemnification provided thereunder shall be in addition to 
(and not in lieu of) the indemnification provided to the 
Shareholders hereunder.

           (f) The indemnification and contribution required by
this Section 2.9 shall be made by periodic payment of the amount 
thereof during the course of the investigation or defense, as and 
when bills are received or expense, loss, damage or liability is 
incurred; provided, that if a court of competent jurisdiction 
finally determines that any Indemnified Person which has received 
payments hereunder does not have an indemnification right under 
this Section 2.9 for any reason, then such Indemnified Person 
shall within five (5) calendar days of such final determination, 
refund all amounts received hereunder to the Company or the 
Shareholder, as the case may be.

           (g) The indemnification and contribution provided for
hereunder will remain in full force and effect regardless of any 
investigation made by or on behalf of any Indemnified Person and 
will survive the transfer of Shares.

                                 -11-
<PAGE>12

ARTICLE 3. Miscellaneous
           -------------

           3.1. Notices.  Any and all notices, consents, offers,
acceptances, or any other communication provided for herein shall 
be sufficient if given in writing and deemed received when 
delivered by first class, registered or certified mail, postage 
prepaid or overnight courier or hand delivery, or when sent by 
facsimile transmission (confirmed by facsimile machine report and 
with a confirmation letter sent by first class mail, postage 
prepaid) which shall be addressed, or sent to the address or 
telecopier number of the party set forth below its signature 
hereto or, in each case, such other address or telecopier number, 
as the case may be, as such party may from time to time designate 
in writing to the other parties.

           3.2. Amendment and Waiver.  No change or modification
of, or waiver of compliance with, this Agreement shall be valid 
unless the same shall be in writing and signed by all of the 
parties hereto.

           3.3. Termination.  This Agreement may be terminated at
any time by an instrument in writing signed by all of the parties 
hereto.  This Agreement shall terminate automatically in the event 
that (i) the Shareholder transfers all of its Restricted Shares, 
or (ii) the Shareholder may sell all of its Restricted Shares 
pursuant to Rule 144(k) of the Securities Act.  Unless sooner 
terminated, this Agreement shall terminate fifteen (15) years from 
the date hereof, unless, at any time within one (1) year prior to 
such date, both of the parties extend its duration for as many 
additional periods, each not to exceed ten (10) years, as they may 
desire.

           3.4. No Waiver.  No failure or delay on the part of the
Company or the Shareholder in exercising any right, between the 
Company and the Shareholder shall operate as a waiver thereof nor 
shall any single or partial exercise of any right, power or 
privilege hereunder preclude the simultaneous or later exercise of 
any other right, power or privilege.  The rights and remedies 
herein expressly provided are cumulative and not exclusive of any 
rights or remedies which the Company or the Shareholder would 
otherwise have.  No notice to or demand on the Company or the 
Shareholder, as the case may be, in any case shall entitle the 
Company or the Shareholder, as the case may be, to any other or 
further notice or demand in similar or other circumstances or 
constitute a waiver of the rights of the Company or the 
Shareholder to take any other or further action in any 
circumstances without notice or demand.

           3.5. Specific Performance.  Each party to this Agreement
acknowledges that the other parties will suffer irreparable injury 
in the event of any breach of any provision of this Agreement and 
that therefore the remedy at law for any breach or threatened 
breach of any such provision of this Agreement will be inadequate.  
Accordingly, upon a breach or threatened breach of any such 
provision of this Agreement by any party hereto, the other parties 
shall, in addition and without prejudice to any of the rights and 
remedies they may have, be entitled as a matter of right, without 
proof of actual damages, to seek specific performance of such 
provisions of this Agreement and to such other injunctive or 
equitable relief to enforce, or prevent any violations (whether 
anticipatory, continuing or future) of, such provisions of this 
Agreement.

           3.6. Counterparts and Headings.  This Agreement may be
executed in two or more counterparts, each of which shall be 
deemed to be an original, but all of which together shall 
constitute one and the same instrument.  All headings and any 
cover page are inserted for convenience or reference only and 
shall not affect its meaning or interpretation.

                             -12-
<PAGE>13

           3.7. Nouns and Pronouns.  Whenever the context may
require, any pronouns used herein shall include the corresponding 
masculine, feminine or neuter forms, and the singular form of 
nouns and pronouns shall include the plural and vice-versa.

           3.8. Expenses.  Except as provided in Section 2.8
hereto, each of the parties to this Agreement shall bear its own 
expenses, including, without limitation, the fees and 
disbursements of its respective counsel, in connection with the 
negotiation and execution of this Agreement and the consummation 
of the transactions contemplated hereby.

           3.9. Governing Law.  This Agreement will be governed by,
and construed and enforced in accordance with, the laws of the 
State of New York, U.S.A., without regard to its conflict of law 
rules.

           3.10. Successors and Assigns.  This Agreement shall
be binding upon and shall inure to the benefit of the Company and 
its successors, and the Shareholder and its successors and 
assigns; provided that the rights and obligations of the 
Shareholder hereunder shall inure to the benefit of and be binding 
upon any transferee of the Shareholder only if such transferee (i) 
is an affiliate of the Shareholder and (ii) agrees in writing to 
be bound by the provisions of this Agreement.  

           3.11. Severability.  In the event that any provision
of this Agreement becomes or is declared by a court of competent 
jurisdiction to be illegal, invalid or unenforceable, the 
remaining provisions hereof shall nevertheless continue in full 
force and effect as though the illegal, invalid or unenforceable 
provisions were not a part hereof, and the parties shall exert 
their best efforts to amend this Agreement to include a provision 
which is legal, valid and enforceable, or to take such other 
action, which in either case carries out the original intent of 
the parties.

           3.12. Complete Agreement.  This Agreement contains
the entire agreement among the parties with respect to the subject 
matter hereof and supersedes all prior and contemporaneous 
arrangements or understandings, whether written or oral, between 
or among any of the parties hereto, with respect to the subject 
matter hereof.

           3.13. Further Assurances.  Each of the parties to
this Agreement agrees to execute such other documents and take 
such other action as may be reasonably necessary to implement and 
carry out the intent of this agreement.

                              -13-
<PAGE>14

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


CISTRON BIOTECHNOLOGY, INC.


By: /s/BRUCE C. GALTON
    ------------------
Name:  BRUCE C. GLATON
Title: Chairman of the Board
       and Chief Executive Officer
Notice Address: 

        Cistron Biotechnology, Inc.
        101 Bloomfield Avenue
        Pine Brook, NJ  07058
        Attention:  Chairman 
        Telecopier: (973) 575-4854
							

with a copy to:

        Seth I. Truwit, Esq.
        Epstein Becker & Green, PC
        250 Park Avenue
        New York, NY  10177
        Telephone:  (212) 351-4709
        Telecopier:  (212) 661-0989

Pasteur Merieux Serums & Vaccins, S.A.


By: /s/DAVID J. WILLIAMS
    --------------------
Name:  DAVOD J. WILLIAMS
Title: President
       and Chief Operating Officer

Notice Address: 


with a copy to:

        Pasteur Merieux Serums & Vaccins, S.A.
        58, avenue Leclerc
        69007 Lyon, France
        Attention:  Senior Vice President, Legal and
        Corporate Affairs
        Telecopier:  011 33 4 72 73 77 84

        Pasteur Merieux Connaught - USA 

                                 -14-
<PAGE>15

        Route 611
        Swiftwater, PA  18370
        Attention:  Vice President, 
        Business Development
        Telecopier:  (717) 839-4600

        and

        Akin, Gump, Strauss, Hauer & Feld, LLP
        590 Madison Avenue
        New York, New York 10022
        Attention:  L. Kevin O'Mara, Jr., Esq.
        Telephone:  (212) 872-1021
        Telecopier:  (212) 872-1002


                                  -15-

<PAGE> 1


Void after 5:00 P.M.                              Common Stock Warrant
New York Time                                     to Purchase 400,000 Shares 
September 3, 2002                                 of Common Stock of Cistron 
                                                  Biotechnology, Inc.    
                                                      No. 4
						  		

                        CISTRON BIOTECHNOLOGY, INC.

                       Common Stock Purchase Warrant
                           __________________

			This Warrant and the shares of Common Stock issuable 
        upon exercise of this Warrant have not been registered under the 
        Securities Act of 1933, as amended (the "Act"), and may not be 
        sold or otherwise disposed of except (a) to a person who, in the 
        opinion of counsel reasonably acceptable to the Company, is a 
        person to whom the securities may be legally transferred without 
        registration and without delivery of a current prospectus under 
        the Act or (b) to a person upon delivery of a prospectus or 
        offering circular then meeting the requirements of the Act relating 
        to such securities and the offering thereof for such sale or 
        disposition.
                                __________________

                                      -1-
<PAGE>2

                This certifies that, FOR VALUE RECEIVED, ROBERT NAISMITH,
PH.D., or registered assigns (the "Holder"), is entitled to purchase, subject
to the provisions of this Warrant, from CISTRON BIOTECHNOLOGY, INC., a Delaware
corporation (the "Company"), 400,000 shares of the Company's common stock,
$.01 par value (the "Common Stock"), at a price of $.25 per share, exercisable
at any time prior to 5:00 P.M., New York Time, on September 3, 2002, at which
time this Warrant shall expire and become void.  The Holder is being issued
this Warrant pursuant to an instruction letter from BlueStone Capital Partners,
L.P. ("BlueStone"), which was entitled to said Warrant pursuant to the
consulting agreement dated September 4, 1997 between the Company and Blues-
Stone, as amended, as partial consideration to BlueStone in connection with the
exeuction and delivery of agreements between the Company and PASTEUR MERIEUX
SERUMS & VACCINS, S.A., a societe anonyme organized under the Laws of France
("PMS&V") on the date hereof.  This Warrant is subject to the provisions of a
letter agreement, dated October 29, 1998, between the Company and PMS&V in
which the Company granted PMS&V a priority with respect to the piggyback
registration of its shares over other security holders of the Company who have
piggyback registration rights.  The number of shares of Common Stock to be
received upon exercise of this Warrant and the price to be paid for each share
of Common Stock are subject to possible adjustment from time to time as
hereinafter set forth.  The shares of Common Stock or other securities or
property deliverable upon such exercise as adjusted from time to time are
hereinafter sometimes referred to as the "Warrant Shares" and the exercise
price of a share of Common Stock in effect at any time and as adjusted from
time to time is hereinafter sometimes referred to as the "Exercise Price."
Unless the context otherwise requires, the term "Warrant" as used herein
includes this Warrant and any other warrant or warrants that may be issued
pursuant to the provisions of this Warrant, whether upon transfer, assignment,
partial exercise, divisions, combinations, exchange, or otherwise, and the
term "Holder" includes any transferee or transferees or assignee or assignees
of the Holder named above, all of whom shall be subject to the provisions of
this Warrant, and, when used with reference to Warrant Shares, means the holder
or holders of such Warrant Shares.

        Section 1.      Exercise of Warrant.
                        --------------------

                1.1.    Method of Exercise.  This Warrant may be exercised in
whole or in part, but for not less than 25,000 Warrant Shares or the balance
then exercisable, at any time by the Holder prior to 5:00 P.M., New York Time,
on September 3, 2002 by presentation and surrender hereof to the Company at
its principal office with the Subscription Form annexed hereto, duly executed
and accompanied by payment, by certified or official bank checks payable to
the order of the Company, of the Exercise Price for the total number of
Warrant Shares purchased.

                1.2.    Delivery of Shares.  Upon proper exercise of this
Warrant, the Company promptly shall deliver certificates for the Warrant Shares
to the Holder duly legended as authorized in the Subscription Form.

                                   -2-
<PAGE>3

                1.3.  Partial Exercise.  If this Warrant is exercised in part
only, the Company shall, upon presentation of this Warrant upon such exercise,
execute and deliver (with the certificate for the Warrant Shares purchased) a
new Warrant evidencing the rights of the Holder hereof to purchase the balance
of the Warrant Shares purchasable hereunder upon the same terms and conditions
as herein set forth.

                1.4.  Fractional Shares.  No fractional shares or scrip
representing fractional shares shall be issued upon exercise of this Warrant
but, in lieu thereof, the Company shall round up to the next full share. 

        Section 2.      Exercise Price and Adjustments.
                        -------------------------------

                2.1.    Initial Exercise Price and Capital Adjustments.  The
Exercise Price at which the Warrant Shares shall be purchasable shall be $.25
per share, subject to adjustment from time to time in the event of stock
dividends, stock subdivisions, stock splits, or stock combinations, as follows:
In the event the Company shall at any time after the date hereof issue shares
of its Common Stock as a stock dividend or shall subdivide or split or
combine the outstanding shares of its Common Stock, the Exercise Price shall
forthwith proportionately be decreased in the case of a stock dividend, sub-
division, or stock split or proportionately be increased in the case of
combination, to the nearest one cent to give effect to such change.
Concurrently, the number of Warrant Shares issuable upon exercise of this
Warrant shall be increased or decreased in proportion to the increase or
decrease in the number of shares of Common Stock outstanding resulting from
such change.  Any such adjustment shall become effective at the close of
business on the date that the subdivision or combination shall become
effective, in the event of a subdivision or combination, or at the close of
business on the record date fixed for the determination of stockholders
entitled to receipt of the stock dividend, in the event of a stock dividend.  

                2.2.    Reorganizations, Mergers, and Sale of Assets.  In the
event of any reorganization or reclassification of the outstanding shares of
Common Stock (other than a change in par value, or from par value to no par
value, or from no par value to par value, or as a result of a subdivision or
combination) or in the case of any consolidation of the Company with, or
merger of the Company into, another corporation after which no securities of
the Company will be publicly held, or in the case of any sale, lease, or
conveyance of all, or substantially all, of the property, assets, business,
and goodwill of the Company as an entity, the Holder shall thereafter have the
right upon exercise to purchase the kind and amount of shares of stock and
other securities and property receivable upon such reorganization,
reclassification, consolidation, merger, or sale by a holder of the number of
shares of Common Stock that the Holder would have received had he exercised
this Warrant immediately prior to such reorganization, reclassification,
consolidation, merger, or sale, at a price equal to the

                              -3-
<PAGE>4

aggregate Exercise Price then in effect pertaining to this Warrant (the kind,
amount, and price of such stock and other securities to be subject to
adjustment as herein provided).

                2.3.    Liquidation and Dissolution.  In the event the Company
shall, at any time prior to the expiration of this Warrant and prior to the
exercise thereof, dissolve, liquidate, or wind up its affairs, the Holder shall
be entitled, upon the exercise thereof, to receive, in lieu of the shares that
he would have been entitled to receive, the same kind and amount of assets as
would have been issued, distributed, or paid to him upon any such dissolution,
liquidation, or winding up with respect to such shares had he been the holder
of record of such shares on the record date for the determination of those
entitled to receive any such liquidating distribution.  After any such
dissolution, liquidation, or winding up that shall result in any cash
distribution in excess of the Exercise Price provided for by this Warrant,
the Holder may, at his option, exercise the same without making payment of the
Exercise Price, and in such case, the Company shall upon the distribution to
the Holder consider that the Exercise Price has been paid in full to it and,
in making settlement to the Holder, shall deduct from the amount payable to
the Holder an amount equal to such Exercise Price.

                2.4.    Amendments Not Required to Reflect Adjustments.  
Irrespective of any adjustments in the Exercise Price or the number or kind
of shares purchasable upon exercise of this Warrant, this Warrant may continue
to express the same price and number and kind of shares as originally issued
and need not be amended to reflect each such adjustment.

        Section 3.      Exchange, Assignment, or Loss of Warrant.

                3.1.    Exchange of Warrant.  This Warrant is exchangeable,
without expense, at the option of the Holder, upon presentation and surrender
hereof to the Company for other Warrants of different denominations entitling
the Holder thereof to purchase in the aggregate the same number of Warrant
Shares purchasable hereunder on the same terms and conditions as herein set
forth.

                3.2.    Assignment of Warrant.  Subject to compliance with
Section 4 hereof, this Warrant may be assigned by presentation and surrender
to the Company at its principal office or at the office of its stock transfer
agent, if any, with the Assignment Form annexed hereto duly executed
accompanied by funds sufficient to pay any transfer tax.  Upon such
presentation and surrender, the Company shall, without charge, execute and
deliver a new Warrant in the name of the assignee named in the Assignment
Form and shall promptly cancel this Warrant.

                3.3.    Loss or Mutilation of Warrant.  Upon receipt by the
Company of evidence satisfactory to it of the loss, theft, destruction, or
mutilation of this Warrant, and (in the case of loss, theft, or destruction)
or reasonably satisfactory indemnification, and upon

                             -4-
<PAGE>5

surrender and cancellation of this Warrant, if mutilated, the Company will
execute and deliver a new Warrant of like tenor and date and any such lost,
stolen, or destroyed Warrant shall thereupon become void.  Any such new
Warrant executed and delivered shall constitute an additional contractual
obligation on the part of the Company, whether or not this Warrant so lost,
stolen, destroyed, or mutilated shall be at any time enforceable by anyone.

        Section 4.      Compliance with Securities Act of 1933.
                        ---------------------------------------

                4.1.    Disposition of Warrant and/or Warrant Shares.  This
Warrant and/or the Warrant Shares may not be sold or otherwise disposed of
except as follows:

                        (a)     To a person who, in the opinion of counsel
        reasonably satisfactory to the Company, is a person to whom this
        Warrant or the Warrant Shares may legally be transferred without
        registration and without the delivery of a current prospectus under
        the Act with respect thereto and then only against receipt of an
        agreement of such person to comply with the provisions of this
        Section 4 with respect to any resale or other disposition of such
        securities unless, in the opinion of counsel, such agreement is not
        required; or

                        (b)     To any person upon delivery of a prospectus or
        offering circular then meeting the requirements of the Act relating to
        such securities and the offering thereof for such sale or disposition.

                4.2.    Legending of Certificates.  Each certificate for
Warrant Shares or for any other security issued or issuable upon exercise of
this Warrant shall contain a legend on the face thereof, in form and substance
satisfactory to counsel to the Company, setting forth the restrictions on
transfer thereof contained in this Section 4.

        Section 5.      Registration Rights.
                        --------------------

                5.1.    Demand Registration Rights.  At any time subsequent to
the date hereof and prior to the Termination Date, upon the written request of
the Holders of a majority of the Warrant Shares issuable (or issued) under this
Warrant, the Company shall on one occasion promptly file (notwithstanding that
at the time of the request this Warrant shall not theretofore have been
exercised) and process to effectiveness under the Securities Act of 1933, the
requisite post-effectiveness amendments or new registration statement necessary
to permit the public offering of the Warrant Shares requested to be registered
in such written request and shall keep the final prospectus current for a
period of nine months to permit the public offering to be effected during such
period.  All costs, expenses and fees of such registration shall be paid by
the Company.
                             -5-
<PAGE>6

                5.2.    "Piggyback" Registration Rights.  Pursuant to a letter
agreement between BlueStone and the Company, dated October 29, 1998, Bluestone
granted PMS&V a priority with respect to piggyback registration of its shares
over other security holders of the Company who have piggyback registration
rights, including the shares issuable upon exercise of this Warrant.  Subject
to the foregoing, in the event the Company at any time subsequent to the date
hereof and prior to the Termination Date contemplates the filing of a
registration statement under the Securities Act of 1933 on Form S-1, S-2 or
S-3 for the public offering of shares of its Common Stock for its own account,
the Company shall give written notice thereof to the Holder of this Warrant
(and/or the Warrant Shares issued upon exercise hereof) at least 30 days prior
to the anticipated filing date and, upon the written request of such Holder,
will, subject to the consent of the managing underwriter of such offering,
include in such registration statement, at the Company's expense, the number
of Warrant Shares requested.  Nothing in this Section 5.2 shall be deemed to
create any liability on the part of the Company to the Holder if the Company,
at its sole discretion, should decide not to proceed with the processing of
such registration statement after filing and before the registration statement
shall become effective.  The Company shall be under no obligation to the
Holder to keep such registration statement current after completion of the
offering by the underwriters. Any Warrant Shares not sold by the Holder
pursuant to such registration statement shall be de-registered.

                5.3.    Expenses.  The expenses to be paid by the Company in
connection with the registration rights granted in Section 5.2 shall include,
without limitation, the fees and expenses of the Company's counsel and
accountants, the costs and expenses incident to the preparation, printing,
filing and processing to effectiveness of the registration statement, the
costs of furnishing the selling Holder of Warrant Shares with a reasonable
number of copies of the Final Prospectus, and the fees and disbursements
incurred in qualifying the Warrant Shares under applicable blue sky or
securities laws, but shall not include any underwriting discounts or
commissions, stock transfer taxes and fees and expenses of counsel for the
Holder of this Warrant and/or the Warrant Shares issuable upon exercise
hereof.

                5.4.    Information To Be Furnished By Holder.  The Holder
shall furnish in writing to the Company all appropriate information
reasonably requested by the Company concerning such Holder in connection
with the preparation and processing of the requisite registration statement
or post-effective amendments relating to a public offering of the Warrant
Shares, including a shareholder's questionnaire, a warranty as to legal
capacity to sell and a statement as to knowledge of adverse facts relating
to the Company, and shall otherwise cooperate with the Company in connection
therewith.

                5.5.    Indemnification.  The Company shall indemnify and
hold harmless each Holder of Warrant Shares included in any registration
statement or post-effective amendment relating to a public offering of
Warrant Shares and each underwriter,

                                 -6-
<PAGE>7

within the meaning of the Securities Act of 1933, who may purchase Warrant
Shares from, or sell Warrant Shares on behalf of, any such Holder from and
against any and all losses, claims, damages and liabilities, joint or several,
to which any such person may become subject under the Securities Act of 1933,
or otherwise, caused by, arising out of or based upon any untrue  statement or
alleged untrue statement of a material fact contained in such registration
statement or post-effective amendment or any prospectus included therein, or
caused by, arising out of or based upon the omission or alleged omission to
state therein a material fact required to be stated therein or necessary to
make the statements therein not misleading, and to reimburse each such Holder
and underwriter for any legal or other expenses reasonably incurred in
connection with investigating or defending any such loss, claim, damage,
liability or action, except insofar as such losses, claims, damages or
liabilities arose out of or are based upon any such untrue statement or
alleged untrue statement or omission or alleged omission based upon information
furnished in writing to the Company by such Holder or underwriter expressly
for use in such registration statement or post-effective amendment, which
indemnification shall include such person, if any, who controls any such
Holder or underwriter within the meaning of the Securities Act of 1933;
provided, however, that the Company shall not be obligated to so indemnify any
such Holder or underwriter unless such Holder or underwriter shall at the same
time reciprocally indemnify the Company, its directors, each officer signing
the related registration statement or post-effective amendment and each person,
if any, who controls the Company within the meaning of the Securities Act of
1933 from and against any and all losses, claims, damages and liabilities,
joint and several, to which the Company or any such person may become subject
under the Securities Act of 1933, or otherwise, caused by, arising out of or
based upon any true statement or alleged untrue statement of a material fact
contained in such registration statement or post-effective amendment or any
prospectus included therein, or caused by, arising out of or based upon the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, and
to reimburse the Company and each such person for any legal or other expenses
reasonably incurred in connection with investigating or defending any such
loss, claim, damage, liability or action, but only to the extent that such
untrue statement or alleged untrue statement, omission or alleged omission is
caused by, arises out of or is based upon information furnished in writing to
the Company by such Holder or underwriter expressly for use in such
registration statement or post-effective amendment.

        Section 6.      Company Covenants.
                        ------------------

                6.1.    Reservation and Issuance of Warrant Shares.  The
Company hereby undertakes until expiration of this Warrant to reserve for
issuance and/or delivery upon exercise of this Warrant, such number of shares
of its Common Stock as shall be required for issuance and/or delivery upon
exercise hereon in full and agrees that all Warrant Shares so issued and/or
delivered will be validly issued, fully paid, and non-assessable and further
agrees to pay all taxes and charges that may be imposed upon such issuance
and/or delivery.
                             -7-
<PAGE>8

                6.2.    Officer's Certificate.  In the event the Exercise Price
shall be adjusted as required by Section 2 hereof, the Company shall mail to
the Holder an officer's certificate setting forth the adjustments so required
and including, in reasonable detail, the method of calculating the adjustments
and the transaction requiring the adjustment.

        Section 7.      Miscellaneous.
                        --------------

                7.1.    Status of Holder.  The Holder shall not be entitled to
vote or receive dividends and shall not otherwise be deemed a shareholder of
the Company.

                7.2.    Notices.  All notices required hereunder shall be sent
by first-class mail, postage prepaid, and shall be addressed, if to the Holder,
to the last known address furnished to the Company and if to the Company, to:
Cistron Biotechnology, Inc., 10 Bloomfield Avenue, Pine Brook, New Jersey
07058, Attn: Bruce Galton, Chairman and Chief Executive Officer, unless
another address is designated in writing by the Holder of the Company.

                7.3.    Binding Effect.  This Warrant shall be binding upon
the Company, its successors, and/or assigns and upon the Holder.

                7.4.    Governing Law.  The validity, interpretation and
performance of this Warrant shall be governed by the laws of the State of
New York.

                              -8-
<PAGE>9
		IN WITNESS WHEREOF, this Warrant has been duly executed by
the Company under its corporate seal as of the 30th day of October 1998. 



                                            CISTRON BIOTECHNOLOGY, INC.  


                                            By:/s/BRUCE C. GALTON
                                               ------------------
                                            Name: BRUCE C. GALTON
                                            Title: Chairman of the Board and
                                                   Chief Executive Officer


ATTEST:


/s/SEITH I. TRUWIT, ESQ.
- ------------------------
Name: SETH IT TRUWIT, ESQ.

                                 -9-
<PAGE>10

FORM OF ASSIGNMENT

                 (To be signed only upon such assignment)



		FOR VALUE RECEIVED, the undersigned hereby sells, assigns
and transfers unto 
the right represented by the within Warrant to purchase, from CISTRON 
BIOTECHNOLOGY, INC. (the "Company"), shares of the Common Stock of the
Company, to which the within Warrant relates, and appoints

attorney to transfer said right, with full power of substitution in the 
premises.

Dated:

                                          ______________________________
                                          (Signature must conform in all
                                           respects to name of holder as
                                           specified on the face of the 
                                           Warrant)                    


ATTEST:


_____________________________
Name:

                                 -10-
<PAGE>11

FORM OF SUBSCRIPTION

                (To be signed only upon exercise of Warrant)



To:	CISTRON BIOTECHNOLOGY, INC.



		The undersigned, the holder of the within Warrant, hereby
irrevocably elects to exercise the purchase rights represented by said
Warrant for, and to purchase thereunder, shares of Common Stock of the
Company, and herewith makes payment of $        therefor, consents to the
affixation of a legend on the certificate for such shares to the effect
that such shares have not been registered under the Securities Act of 1933,
as amended (the "Act"), and may be transferred only in compliance with the
Act, and requests that such certificate(s) be issued in the name of and be
delivered to

whose address is
and if such shares shall not be all of the shares purchased hereunder, that
a new Warrant of like tenor for the balance of shares purchasable hereunder
be delivered to the undersigned.


Dated:                                    _________________________________
                                          (Signature must conform in all
                                           respects to name of holder as
                                           specified on the face of the
                                           Warrant)


<PAGE> 1

                   ----------------------------------

                   COLLABORATION and OPTION AGREEMENT

                                IL-1 BETA 

                   ----------------------------------


This Agreement is entered this 30th day of October, 1998 (the "Effective 
Date") into by and between :


        CISTRON BIOTECHNOLOGY, INC., a corporation  organized and existing 
        under the laws of the State of Delaware, having its principal place
        of business at 10, Bloomfield Avenue, Pine Brook, New Jersey 07058,
        USA

	(hereinafter referred to as "CISTRON")

and

        PASTEUR MERIEUX Serums & Vaccins - a Pasteur Merieux Connaught
        Company, a societe anonyme organized and existing under the laws of
        the French Republic, having its registered head office at 58, avenue
        Leclerc, 69007, Lyon, France, 

	(hereinafter referred to as "PMC")

                                
                                WITNESSETH
                                ----------


WHEREAS, CISTRON has developed intellectual property, including inventions 
which are the subject matter of patents and patent applications and  secret 
and substantial know-how, relating to a cytokine called Interleukin 1 beta 
("IL-1b" or the "FACTOR") used as an immuno-adjuvant ;

WHEREAS, PMC wishes to obtain from CISTRON an option for a license to use 
CISTRON' inventions relating to the FACTOR for use as an adjuvant in human 
vaccines, and CISTRON is shalling to grant such license option to PMC, 
subject to the terms of and conditioned upon this Agreement ;

WHEREAS, CISTRON and PMC also want to collaborate in order to identify and 
discover vaccine antigens suitable for combination with the FACTOR as an 
adjuvant, to be used as either mucosal or parenteral preparations for the 
prevention or treatment and/or cure of infectious diseases and cancers, 
which shall be used by PMC to evaluate potential vaccine products for use 
in humans, thus expanding the intellectual property portfolio with respect 
to the use of the FACTOR as an immuno-adjuvant.


NOW, THEREFORE, in consideration of the respective representations and 
covenants of each of the Parties as set forth below, CISTRON and PMC, 
intending to be legally bound, agree as
follows :


ARTICLE I - DEFINITIONS AND INTERPRETATION
- ------------------------------------------

1.1.	Definitions : For the purposes of this Agreement the following words 
and phrases shall have the following meanings :

                                   -1-
<PAGE>2

        (a) "Affiliate" means, with respect to any Person, (i) any other 
            Person of which the securities or other ownership interests 
            representing fifty per cent (50 %) or more of the equity or fifty 
            per cent (50 %) or more of the ordinary voting power or fifty per 
            cent (50 %) or more of the general partnership interest are, at 
            the time such determination is being made, owned, Controlled or 
            held, directly or indirectly, by such Person (a "Subsidiary"), or 
            (ii) any other Person which, at the time such determination is 
            being made, is Controlling or under common Control with, such 
            Person. As used herein, the term "Control", whether used as a 
            noun or verb, refers to the possession, directly or indirectly, 
            of the power to direct, or cause the direction of, the management 
            or policies of a Person, whether through the ownership of voting 
            securities, by contract or otherwise.

        (b) "Agreement" means this agreement, all amendments and supplements 
            to this Agreement and all schedules to this Agreement, including 
            the following :

            Schedule A -    OPTIONED PATENTS
            Exhibit 1 -     RESEARCH PROGRAM
            Exhibit 2 -     LICENSE AGREEMENT

        (c) "Biological Materials" shall mean any biological materials 
            including but not limited to structural genes, genetic sequences, 
            promoters, enhancers, probes, linkage probes, vectors, hosts, 
            plasmids, peptides, polypeptides, transformed cell lines, 
            transgenic animals, proteins, biological modifiers, antigens, 
            reagents, hybridomas, antibodies, toxins, lectins, enzymes, 
            lipids, hormones, viruses, cells or parts of cells, cell lines, 
            fragments of any of the foregoing and any other biologically 
            active material or compound, whether or not occurring naturally 
            or howsoever derived, modified, conjugated, cross-linked, 
            immobilized, reduced, purified or produces, whether by 
            recombinant DNA techniques and/or otherwise.

        (d) "Calendar Quarter" means any of the three-month periods beginning 
            January 1, April 1, July 1 and October 1 in any year.

        (e) "CISTRON Improvement" means Improvements which are conceived 
            during the term of this Agreement solely or jointly by employees 
            or contractors acting on behalf of CISTRON or its Affiliates, to 
            the extent that CISTRON has now or hereafter shall have the right 
            to grant licenses, immunities or other rights thereon.
        
        (f) "CISTRON Technology" means the OPTIONED PATENTS, the OPTIONED 
            KNOW-HOW and the CISTRON  Improvements, and shall include 
            CISTRON's share in any JOINT INVENTIONS and Joint Patent Rights.

        (g) "Confidential Information" has the meaning ascribed to it in 
            Section 4.1. of this Agreement.

        (h) "Event of Force Majeure" has the meaning ascribed to it in 
            Article 4.4. of this Agreement.

        (i) "FACTOR" means the cytokine (a protein) called Interleukin 1 
            beta, or IL-1b, as described in the OPTIONED PATENTS, and any 
            derivatives thereof, and is intended to refer to both the protein 
            itself and the gene encoding thereto.

        (j) "Field of Preventative Vaccines" means the field comprised of 
            bio-pharmaceutical products for the prevention through active 
            immunization against infectious diseases and/or cancers in 
            humans.

        (k) "Field of Therapeutic Vaccines" means the field comprised of bio-
            pharmaceutical products for the immunotherapy through active 
            immunization against infectious diseases and/or cancers in 
            humans.
                                      -2-
<PAGE>3

        (l) "Field of Use" means either the Field of the Therapeutic Vaccines 
            or the Field of the Preventative Vacines or both.

        (m) "Improvements" means all patentable  and non-patentable 
            inventions, discoveries, technology and information of any type 
            whatsoever, including without limitation Biological Materials, 
            methods, processes, technical information, knowledge, experience 
            and know-how which utilize, incorporate, derive from, or are 
            based on CISTRON Technology or could not be conceived, developed 
            or reduced to practice but for the use of the CISTRON Technology. 

        (n) "JOINT INVENTIONS" and "Joint Patent Rights" have the meaning 
            ascribed to it in Section 3.7 hereof.

        (o) "License Issue Fee" is defined in Section 2.2.3 hereof.

        (p) "OPTIONED KNOW-HOW" means any and all technical information, 
            discoveries, improvements, processes, formulae, data, 
            engineering, technical and shop drawings, inventions, Biological 
            Materials, shop-rights, know-how and trade secrets which is 
            useful or necessary to make, have made, use or sell the FACTOR 
            and/or PRODUCTS or to practice under the OPTIONED PATENTS in the 
            Field of Use, which have been, or hereafter are, either developed 
            reduced to practice by CISTRON or its Affiliates, or the rights 
            to which in the Field of Use have been acquired by CISTRON or its 
            Affiliates and to which CISTRON or its Affiliates have a 
            transferable interest.

        (q) "OPTIONED PATENTS" means :

            (i)   any existing patents and patent applications listed in 
                  Schedule A to this Agreement ;

            (ii)  any future patents issued from any patent applications 
                  referred to in Paragraph 1.(p).(i) above and any future 
                  patents issued from a patent application filed in any country 
                  in the Territory which corresponds to a patent or patent 
                  application identified in Paragraph 1.(p).(i) above ;

            (iii) any reissues, confirmations, renewals, extensions, 
                  counterparts, divisions, continuations, continuations-in-
                  part, supplemental protection certificates or utility models
                  issued, assigned or licensed to CISTRON or its Affiliates of
                  or relating to the patents or patent applications identified
                  in Paragraph 1.(p).(i) and (ii) above 

            (iv)  any future patents and patent applications covering CISTRON 
                  Improvements, solely or jointly owned by CISTRON or its 
                  Affiliates, or licensed by CISTRON or its Affiliates with the
                  right to sublicense any JOINT INVENTIONS or Joint Patent 
                  Rights. 

        (r) "Notice of Dispute" has the meaning ascribed to it in Section 
            4.7.4.(a) of this Agreement.

        (s) "Option" and "Option Period" are defined in Article 2 hereof.

        (t) "Parties" means PMC and CISTRON, and "Party" means any one of 
            them.

        (u) "Person" means an individual, corporation, partnership, trust, 
            business trust, association, joint stock company, pool, 
            syndicate, sole proprietorship, unincorporated organization, 
            governmental authority or any other form of entity not 
            specifically listed herein.

        (v) "PMC Improvement" means Improvements which are conceived during 
            the term of this Agreement solely or jointly by employees or 
            contractors acting on behalf of PMC

                                  -3-
<PAGE>4
            or its Affiliates, to the extent that PMC has now or hereafter
            shall have the right to grant licenses, immunities or other
            rights thereon.
        
        (w) "PRODUCTS" means any and all vaccines or other bio-pharmaceutical 
            products intended for use in the Field of Preventative Vaccines 
            or the Field of Therapeutic Vaccines which (i) incorporate the 
            FACTOR as an adjuvant or (ii) more generally utilize any or are 
            based on any CISTRON Technology.

        (x) "Selected Field of Use" is defined in Section 2.2.3 hereof.

        (y) "Third-Party" means any Person other than PMC, CISTRON and their 
            respective Affiliates.

        (z) "Valid Patent Claim" means a claim of an issued and unexpired 
            patent or patent application included in OPTIONED PATENTS which 
            has not been held permanently revoked, unenforceable or invalid 
            by a decision of a court or other governmental agency of 
            competent jurisdiction, unappealable or unappealed within the 
            time allowed for appeal, and which has not been admitted to be 
            invalid or unenforceable through reissue or disclaimer or 
            otherwise. If there should be two or more decisions within the 
            same country which are conflicting with respect to the invalidity 
            of the same claim, the decision of the highest tribunal shall 
            thereafter control. However, should the tribunals be of equal 
            authority, then the decision or decisions holding the claim valid 
            shall prevail where the conflicting decisions are equal in number 
            and the majority of decisions shall prevail where the conflicting 
            decisions are not equal in number.
        

1.2.    Certain Rules of Interpretation in this Agreement and the Schedules:

        (a) An accounting term not otherwise defined has the meaning assigned 
            to it by, and every accounting matter shall be determined in 
            accordance with, generally accepted accounting principles in the 
            United States of America;

        (b) Unless otherwise specified, all references to monetary amounts 
            are to United States dollars currency (US$);

        (c) The descriptive headings of Articles and Sections are inserted 
            solely for convenience of reference and are not intended as 
            complete or accurate descriptions of the content of such Articles 
            or Sections ;

        (d) The use of words in the singular or plural, or with a particular 
            gender, shall not limit the scope or exclude the application of 
            any provision of this Agreement to such Person or Persons or 
            circumstances as the context otherwise permits ;

        (e) Whenever a provision of this Agreement requires an approval or 
            consent by a Party to this Agreement and notification of such 
            approval or consent is not delivered within the applicable time 
            limit, then, unless otherwise specified, the Party whose approval 
            or consent is required shall be conclusively deemed to have 
            withheld its approval or consent ;

        (f) Unless otherwise specified, time periods within or following 
            which any payment is to be made or act is to be done shall be 
            calculated by excluding the day on which the period commences and 
            including the day on which the period ends and by extending the 
            period to the next business day following if the last day of the 
            period is not a business day in the jurisdiction of the Party to 
            make such payment or do such act ; and 

        (g) Whenever any payment is to be made or action to be taken under 
            this Agreement is required to be made or taken on a day other than
            a business day, such payment shall be made or action taken on the
            next business day following such day in the jurisdiction of the
            Party to make such payment or do such act.

                                   -4-
<PAGE>5

ARTICLE 2 - OPTION
- ------------------

2.1.	Research License to PMC
        -----------------------

        Subject to the provisions of this Agreement, CISTRON hereby grants to
        PMC and its Affiliates, and PMC hereby accepts, for the term provided
        for in section 2.2.2. hereof  (the "Option Period"), the right to use
        CISTRON Technology solely for the purpose of conducting research &
        development activities (including pre-clinical and clinical studies)
        in the Field of Use relating to the FACTOR and PRODUCTS and evaluating
        PMC's interest in exercising the Option. PMC shall communicate to
        CISTRON an outline of the research work that PMC intends to conduct
        during the Option Period and shall keep CISTRON informed of its
        progress throughout such term in accordance with Section 3.2 hereof.

        CISTRON agrees that promptly following the execution of this Agreement,
        it shall make available to PMC and/or a designated PMC Affiliate such
        OPTIONED KNOW-HOW (including, but not limited to, non-published patent
        applications) and such quantities of research grade FACTOR as
        reasonably necessary to enable PMC to conduct its own research &
        development activities during the Option Period and to evaluate its
        interest in exercising the Option; provided, however, that CISTRON
        shall not be obligated to provide PMC with more than One Hundred
        milligrams (100 mg) of research grade FACTOR per Calendar Quarter.
        PMC hereby covenants to CISTRON that PMC shall not use research grade
        FACTOR supplied to it by CISTRON hereunder for the purpose of clinical
        trials or any similar experiments in humans. PMC shall be responsible
        for manufacturing or having manufactured clinical grade FACTOR, provided
        that PMC shall consult with CISTRON in this respect and shall exert
        commercially reasonable efforts in organizing such manufacturing so
        that there is sufficient supply of FACTOR for use by CISTRON for the
        needs of the Research Program and other CISTRON needs in addition to
        PMC's needs. CISTRON shall indicate to PMC its best estimates of the
        quantities of FACTOR that it may need during the Option Period.

        Certain research & development activities to be performed during the
        Option Period shall be conducted on a collaborative basis by PMC and
        CISTRON in accordance with and subject to the terms & conditions set
        forth in Article 3.

2.2.	Option
        ------

2.2.1.	Grant of the Option.
        --------------------

        Subject to the provisions of this Agreement, CISTRON hereby grants to 
        PMC, and PMC hereby accepts, an exclusive option (the "Option") to 
        enter into a license under terms and conditions set forth in the 
        License Agreement herewith attached as Exhibit 2. Without limiting the
        generality of the foregoing, CISTRON covenants that during the Option
        Period, neither CISTRON nor its Affiliates shall grant to any Third-
        Party any right, license or privilege to use CISTRON Technology in the
        Field of Use. PMC may exercise the Option at any time on or before the
        expiration of the Option Period in accordance with Section 2.2.3 
        hereinafter.


2.2.2.	Option Period.
        --------------

        The Option Period shall commence on the Effective Date and shall 
        continue for a period of three (3) years thereafter, unless otherwise 
        terminates in accordance with its terms.

                                     -5-
<PAGE>6

2.2.3.	Exercise of the Option.
        -----------------------
        PMC may exercise the Option at any time during the Option Period but 
        in any case no later than the date upon which the Option Period shall 
        expire by (i) providing written notice to CISTRON not less than thirty
        (30) days prior to the expiration of the Option Period specifying the 
        Selected Field(s) of Use and (ii) by paying to CISTRON a non-
        refundable, non-creditable license issue fee of Three Million and Five
        Hundred Thousand US Dollars (3,500,000.- US$) per Selected Field of 
        Use (the "License Issue Fee"), provided, however, that the License 
        Issue Fee with respect to the Field of Preventative Vaccines shall be
        paid at the latest by October 31, 2001 if such field is selected by 
        PMC, and the License Issue Fee with respect to the Field of 
        Therapeutic Vaccines shall be paid  not later than  January 30, 2002, 
        if such field is selected by PMC. For the purpose of this Agreement, 
        "Selected Field of Use" shall mean the field in which PMC may choose 
        to exercise its option right and therefore obtain the LICENSE, which 
        may be comprised of the Field of the Preventative Vaccines, or the 
        Field of the Therapeutic Vaccines, or both.


2.2.4.	Effect of Failure to Exercise Option.
        -------------------------------------

        Without prejudice to the last paragraph of this Section 2.2.4., in the
        event PMC fails to properly and timely exercise the Option in the 
        Field of Use, PMC shall be deemed to have forfeited all its rights 
        hereunder, and it shall promptly return to CISTRON all CISTRON 
        Technology and all embodiments of such technology.

        Without prejudice to the last paragraph of this Section 2.2.4., in the
        event PMC fails to properly and timely exercise the Option in either 
        the Field of Preventative Vaccines or the Field of Therapeutic 
        Vaccines, then PMC shall be deemed to have forfeited its rights 
        hereunder to the extent such rights pertain to the non-selected field 
        and it shall promptly return to CISTRON all CISTRON Technology and all 
        embodiments of such technology.

        In both cases, PMC and CISTRON shall remain joint owners of JOINT 
        INVENTIONS under the terms and conditions of Section 3.7 hereof.

2.2.5.	Actions to be Taken upon Option Exercise.
        -----------------------------------------

        In the event that PMC exercises the Option in a Field of Use, it shall
        send to CISTRON along with the notice provided for in Section 2.2.3. 
        hereof, two original counterparts of the License Agreement herewith 
        attached as Exhibit 2, ready for execution, adjusted to reflect the 
        Selected Field of Use if required. PMC shall also join a term sheet 
        describing proposed terms and conditions for the continued 
        commercialization of JOINT INVENTIONS by CISTRON outside the Selected 
        Field of Use.


ARTICLE 3 - RESEARCH COLLABORATION.
- -----------------------------------

3.1.	Object.
        -------

        Pursuant to a mutually agreed upon research program attached hereto as
        Exhibit 1 (the "Research Program"), CISTRON agrees to conduct 
        research works described therein and PMC agrees to support and fund 
        such Research Program in accordance with the terms and conditions set 
        forth here below.


3.2.	Oversight of the Research Program.
        ----------------------------------

        The Parties shall meet as they deem fit and in any event not less 
        than once a year during the term of the Research Program, at such 
        dates and times as agreed to by the Parties. Face to face meetings 
        shall normally take place at CISTRON's premises or such other place 
        as may be mutually agreed upon. Meetings may be held by 
        telecommunication means. At such meetings, CISTRON shall present  the 
        status of performance by CISTRON under the Research Program and 
        purposes and conditions of any collaboration with a Third-Party that

                                   -6-
<PAGE>7

        CISTRON may intend to enter into in connection with the Research 
        Program and the Parties shall jointly evaluate the results thereof 
        and set priorities therefor in accordance with CISTRON's 
        recommendations. PMC shall have the right to comment on CISTRON's 
        recommendations, and CISTRON shall give due consideration to such 
        PMC's comments, but CISTRON shall have the final decision on any 
        matters relating to the performance of the Research Program. 
        Similarly, during the above-mentioned meetings, PMC shall present the 
        status of performance by PMC under its own research program, and the 
        Parties shall jointly evaluate the results thereof and set priorities 
        therefor in accordance with PMC's recommendations. CISTRON shall have 
        the right to comment on PMC's recommendations, and PMC shall give due 
        consideration to such CISTRON's comments, but PMC shall have the 
        final decision on any matters relating to the performance of PMC 
        research in the Field of Use. The Parties shall prepare written 
        minutes of each meeting and a written record of all decisions whether 
        made at a formal meeting or not. Such minutes shall incorporate semi-
        annual research reports prepared by CISTRON and semi-annual reports 
        prepared by PMC.


3.3.	Conduct of Research Program. 
        ----------------------------
        
3.3.1.	Good Laboratory Practice. The Research Program shall be conducted 
        by CISTRON at CISTRON's laboratories and/or at Third-Party research 
        laboratories contracted by CISTRON.  CISTRON shall use all reasonable 
        efforts to complete research works in accordance with the said 
        Program. Any research work performed by CISTRON pursuant hereto shall 
        be in compliance with current Good Laboratory Practices (cGLP) as 
        applicable in the United States of America.

3.3.2.	Laboratory Notebooks. CISTRON shall cause its employees, agents 
        and subcontractors to maintain laboratory notebooks. Such laboratory 
        notebooks shall set forth such work in detail, including a clear 
        description of the purposes for which the work has been undertaken 
        and the results expected ; sufficient details, diagrams, plans, 
        sketches and identification of materials (including Biological 
        Materials) used, formulations and operating conditions under which 
        the work was conducted as may be necessary to understand and 
        reproduce the work conducted ; identification of any intermediate or 
        final results achieved ; and if such laboratory notebooks contain any 
        interpretations of data, they shall also describe the rough data upon 
        which such interpretations have been based. CISTRON shall further 
        cause its employees, agents and  subcontractors maintaining such 
        laboratory notebooks to have their work corroborated periodically, 
        which corroboration shall include at least personal witnessing of the 
        notebooks indicating that the witness has read and understood the 
        material on the page witnessed on the date that he or she signed it.


3.4.	Financial conditions.
        ---------------------

3.4.1.	Support commitment. In consideration of the work performed by 
        CISTRON pursuant to and in accordance with the Research Program, PMC 
        shall pay to CISTRON during the Research Program  Three Hundred 
        Thousand United States dollars  (300,000.- US$) per year for three 
        (3) years.  Such payments shall be non-refundable, guaranteed and not 
        contingent upon any research milestones.


3.4.2.	Payments Schedule. Support payments shall be made by PMC to 
        CISTRON in twelve (12) quarterly payments of Seventy Five Thousand 
        United States dollars (75,000- US$)  in advance with the first 
        payment to be made within fifteen (15) days of the Effective Date of 
        this Agreement, and the other payments payable on the first day of 
        each of the subsequent Calendar Quarters. 

                                   -7-
<PAGE>8

3.4.3.	No Conflict With Research Program. CISTRON agrees that the  funds 
        provided by PMC hereunder shall be applied to the Research Program 
        and to Field of Use-related research and may not, without PMC prior 
        written approval, be used in support of any r research at CISTRON 
        which would not be closely related to the Field of Use, the FACTOR or 
        PRODUCTS.


3.4.4.	Title to Equipment. CISTRON shall retain title to any equipment 
        purchased with funds provided by PMC under this Agreement, if such 
        purchase is mutually agreed upon  to support  the Research Program.
        

3.5.	Term of the Research Program.
        The term of the Research Program shall be three (3) years as from the 
        Effective Date.


3.6.	Confidentiality.
        In order to facilitate the Research Program, either Party may disclose
        confidential or proprietary information owned or controlled by it to 
        the other. It is hereby understood and agreed that such information 
        shall be deemed "Confidential Information" as defined in Article 4.1. 
        and treated as such.


3.7.	JOINT INVENTIONS.
        -----------------

3.7.1	Inventions Arising During Option Period.  All right, title and 
        interest in and to any technology or invention, whether or not 
        patentable, and any patent applications and patents based thereof, 
        made or conceived by or on behalf of either Party during the Option 
        Period which are (i) CISTRON Improvements, (ii) PMC Improvements or 
        (iii) inventions made jointly by CISTRON employees and PMC employees 
        in the course of the Research Program, shall be deemed to be joint 
        inventions ("Joint Inventions") and shall be jointly owned by the 
        Parties on an equal basis.  In the event that CISTRON wishes to 
        commercialize any Joint Invention which does not infringe on any 
        CISTRON Technology (i) outside the Fields of Use at any time, or 
        (ii) within either Field of Use following the expiration of the 
        Option Period (assuming PMC has declined to exercise the PMC Option 
        in respect of such Field of Use), CISTRON agrees to pay a royalty to 
        PMC, on the terms provided below.  In the event that PMC wishes to 
        commercialize any Joint Invention (i) outside the Fields of Use at 
        any time, or (ii) within either Field of Use following the 
        expiration of the Option Period (assuming PMC has declined to 
        exercise the PMC Option in respect of such Field of Use), PMC agrees 
        to pay a royalty to CISTRON, on the terms provided below.  In the 
        event that PMC wishes to commercialize any Joint Invention which 
        does infringe on any CISTRON Technology, it shall only do so under a 
        license from CISTRON.

3.7.2.	Inventions Arising Subsequent to Option Period.  Each of the 
        Parties hereto shall have the rights set forth below in respect of 
        any and all inventions, whether or not patentable, made by either 
        Party following expiration of the Option Period:  (a) in the event 
        that PMC has made an invention, PMC shall own all right, title and 
        interest in and to such invention and shall be free to use such 
        invention as it sees fit, provided it does not infringe upon any 
        CISTRON Technology under which PMC does not have a license (provided 
        this shall not limit PMC's obligations under that certain license 
        agreement between the Parties), and (b) in the event that CISTRON 
        has made an invention which is derived from or based upon any Joint 
        Invention, CISTRON will own all right, title and interest in and to 
        such invention, and (i) if PMC has not exercised the PMC Option, 
        CISTRON shall be free to use such invention as it sees fit, and 
        shall pay a royalty to PMC on sales of products using such invention 
        on the terms provided below, and (ii) if PMC has exercised the PMC 
        Option in respect of either or both Fields of Use, the rights to 
        such invention shall be automatically included in the

                                  -8-
<PAGE>9

        LICENSE AGREEMENT and licensed thereunder to PMC in the applicable
        Field(s) of Use, and CISTRON shall be free to use such invention as
        it sees fit outside the applicable Field(s) of Use, and shall pay a
        royalty to PMC on sales of products using such invention, on the terms 
        provided below.

3.7.3	Determination of Royalties.  In determining the royalty payable 
        to the other Party, in the event a royalty is to be paid pursuant to 
        subparagraph 3.7.1 or 3.7.2 hereof, the Parties agree to negotiate 
        in good faith a reasonable royalty which reflects the value of the 
        Joint Invention in relation to all other technology and proprietary 
        rights included in such product and, in the case of subparagraph 
        3.7.2 hereof only, the importance of the Joint Invention to the 
        discovery of the subsequent invention by a Party.  

3.7.4	As to any JOINT INVENTIONS made by the Parties during the term of 
        this Agreement, CISTRON shall have the first right to file patent 
        applications with respect to such inventions in the name of both 
        Parties. CISTRON may elect not to file and if it does so, PMC 
        shall have the right to file the patent application. Any patents 
        and patent applications covering a JOINT INVENTION are referred 
        to herein as "Joint Patent Rights". In any case, the filing Party 
        shall give the non-filing Party an opportunity to review the text 
        of the application before filing, shall consult with the non-
        filing Party with respect thereto and shall supply the non-filing 
        Party with a copy of the applications as filed, together with 
        notice of its filing date and serial number and fifty percent 
        (50%) of the out-of-pocket costs and expenses of the filing Party 
        shall be reimbursed by the other Party. Both Parties shall keep 
        the other advised of the status of actual and prospective patent 
        application filings and upon request, provide advanced copies of 
        any documents related to such filings and thereafter to the 
        prosecution and maintenance of all patent applications and 
        patents pertaining to Joint Patent Rights.


3.8	Commercialization of Inventions.
        --------------------------------

	CISTRON and PMC each hereby represents that all employees and other
        Persons acting on its behalf in performing its obligations under 
        this Agreement shall be obligated under a binding written 
        agreement to assign to it, or as it shall direct, all 
        Improvements conceived or reduced to practice by such employees 
        or other Persons during the term of this Agreement.


3.8.1	Patent Prosecution and Maintenance.
        -----------------------------------

	OPTIONED PATENTS. CISTRON shall be responsible for and shall control 
        the preparation, filing, prosecution, grant and maintenance of all 
        OPTIONED PATENTS. CISTRON shall prepare, file, prosecute and maintain 
        such OPTIONED PATENTS in good faith consistent with its customary 
        patent policy and its reasonable business judgement, and shall 
        consider in good faith the interests of PMC in so doing.

	Costs. With respect to all filings hereunder, the filing Party shall 
        be responsible for payment of all costs and expenses related to such 
        filings, prosecution and maintenance, unless relieved of same 
        pursuant to Section 3.8.2 hereinafter, and except for jointly owned 
        patents, for which fifty percent (50%) of all such costs and expenses 
        shall be reimbursed to the filing Party by the other Party.


3.8.2	Option to Prosecute and Maintain Patents.
        -----------------------------------------

        CISTRON shall give notice to PMC of any intention to cease prosecution
        and/or maintenance, or not to proceed with an extension, of OPTIONED 
        PATENTS and, in such case, shall permit PMC, at PMC's sole 
        discretion, to continue prosecution or maintenance or proceed with 
        the extension at its own expenses. If PMC elects to continue 
        prosecution or maintenance or to proceed with the extension, CISTRON 
        shall execute such documents and perform such acts at PMC's expense 
        as may be reasonably necessary to effect an

                                     -9-
<PAGE>10

        assignment of such OPTIONED PATENTS to PMC in a timely manner, and
        more generally to permit PMC to continue such prosecution and
        maintenance or to proceed with the extension. Any patents and patent
        applications so assigned shall not be considered as OPTIONED PATENTS
        as of the date of such assignment. No royalties shall be payable by
        PMC on sales of PRODUCTS covered only by a Valid Patent Claim of a
        OPTIONED PATENT which has been assigned to PMC pursuant to this
        Section 3.8.


3.8.3	Interference, Opposition, Reexamination and Reissue.
        ----------------------------------------------------

        (i)   The Parties shall use their respective best efforts to within
              ten (10) days of learning of any interference, opposition, 
              reexamination or reissue event, inform the other Party of any 
              request for, or filing or declaration thereof relating to
              OPTIONED PATENTS.  The Parties shall thereafter consult and
              cooperate fully to determine the course of action with respect
              to any such proceeding. Both Parties shall have the right to
              review and comment on any submission to be made in connection
              with any such proceeding.

        (ii)  CISTRON shall not institute any reexamination or reissue 
              proceeding relating to OPTIONED PATENTS without having first 
              consulted PMC.

        (iii) In connection with any interference, opposition, reissue or 
              reexamination proceeding relating to OPTIONED PATENTS, the
              Parties shall cooperate fully and shall provide each other
              with any information or assistance that either Party may
              reasonably request. CISTRON shall keep PMC informed of
              developments in any such action or proceeding, including,
              to the extent permissible, the status of any settlement
              negotiations and the terms of any offer related thereto.

        (iv)  CISTRON shall bear the expense of any interference, opposition,
              reexamination or reissue proceeding relating to OPTIONED
              PATENTS.


3.8.4	Enforcement and Defense. 
        ------------------------

        (i)   Each Party shall give the other notice of either (a) any 
              infringement of OPTIONED PATENTS, or (b) any misappropriation
              or misuse of OPTIONED KNOW-HOW that has come to its attention.
              The Parties shall thereafter consult and cooperate fully to
              determine a course of action, including but not limited to the
              commencement of legal action by either or both Parties to
              terminate any infringement of OPTIONED PATENTS or any
              misappropriation or misuse of OPTIONED KNOW-HOW.

        (ii)  In the event that OPTIONED PATENTS are infringed by any Third-
              Party with respect to a PRODUCT in the Field of Use, CISTRON,
              upon notice to PMC, shall have the first right, but not the
              obligation, to institute and prosecute any action or proceeding
              under OPTIONED PATENTS with respect to such infringement, by
              counsel of its choice, or to control the defense of any
              declaratory judgment action arising from such infringement or
              from the misappropriation or misuse of OPTIONED KNOW-HOW, at its
              own expense and in the name of both Parties. CISTRON shall not
              settle, compromise or take any action in such litigation which
              diminish, limit or inhibit the scope, validity or enforceability
              of OPTIONED PATENTS without the express permission of PMC.
              CISTRON shall keep PMC advised of the progress of such
              proceedings.

        (iii) In the event that a Third-Party is infringing any OPTIONED 
              PATENTS with respect to a PRODUCT in the Field of Use and CISTRON
              does not elect to institute an action, PMC, upon notice to 
              CISTRON, shall have the right, but not the obligation, to 
              institute and prosecute any action or proceeding under OPTIONED 
              PATENTS with respect to such infringement, by counsel of its 
              choice, or to control the defense of any declaratory judgment 
              action arising from such infringement or from the
              misappropriation or misuse of OPTIONED KNOW-HOW, at its own
              expense and in the name of both Parties. PMC shall not settle,
              compromise or take any action in such litigation which diminish,
              limit or
                                  -10-
<PAGE>11

              inhibit the scope, validity or enforceability of OPTIONED
              PATENTS without the prior approval of CISTRON, which
              shall not be unreasonably withheld.

        (iv)  With respect to any action to terminate any infringement of 
              OPTIONED PATENTS or any misappropriation or misuse of OPTIONED 
              KNOW-HOW, the Parties shall cooperate fully and shall provide
              each other with any information and assistance that either Party
              may reasonably request. In particular, either Party shall execute
              such documents necessary for the other Party to initiate and
              prosecute the action or proceeding and cause its Affiliates and
              Sublicensees to execute all such documents, if required. In the
              event that either Party is unable to initiate or prosecute an
              action solely in its own name, the other Party shall then join
              such action voluntarily. Each Party shall keep the other
              informed of the development of any action or proceeding
              including, to the extent permissible by law, the status of any
              settlement negotiations and the terms of any offer related
              thereto.

        (v)   Any recovery obtained by either or both Parties in connection 
              with or as a result of any action or proceeding contemplated by
              this Section 3.8, whether by settlement or otherwise, shall be 
              allocated in order as follows:

              (a) The Party which initiated and prosecuted the action shall
                  recoup all of its costs and expenses incurred in connection 
                  with the action (provided that if PMC was the initiating
                  Party and that the action proceeds were not sufficient for
                  PMC to recoup all its costs and expenses, then PMC shall be
                  allowed to deduct the balance of its unrecovered costs and
                  expenses from royalties payable to CISTRON under Article 3
                  hereof) ;

              (b) The other Party shall then, to the extent possible, recover 
                  its costs and expenses incurred in connection with the
                  action; and

              (c) The amounts of any recovery remaining shall then be 
                  allocated between the Parties with PMC receiving all amounts
                  in respect of damages in the Field of Use and CISTRON
                  receiving all amounts in respect of damages out of the Field
                  of Use, except that any amounts recovered in connection with
                  infringement actions relating to jointly-owned patents shall
                  be equally shared between the Parties.

        (vi)  CISTRON shall inform PMC of any certification regarding any 
              OPTIONED PATENTS it has received pursuant to 21 United States
              Code 355(b)(2)(A)(iv) or (j)(2)(A)(vii)(IV), or any similar
              provision in other countries, and shall provide PMC with a copy
              of such certification within five (5) days of receipt. Both
              Parties rights with respect to the initiation and prosecution of
              any legal action as a result of such certification or any
              recovery obtained as a result of such legal action shall be as
              defined in paragraphs (a) to (c) of this Section 3.8.4(v).


3.8.5	Notice of Patent Events.
        ------------------------

	CISTRON shall promptly give notice to the other Party of the grant, 
        lapse, revocation, surrender or invalidation of any OPTIONED PATENTS.


3.8.6	Patent Term Restoration.
        ------------------------

        CISTRON shall notify PMC of (a) the issuance of each U.S. patent
        included within the OPTIONED PATENTS, giving the date of issue and
        patent number for each such patent, and (b) each notice pertaining to
        any patent included within the OPTIONED PATENTS which it receives as
        patent owner pursuant to the United Sates Drug Price Competition and 
        Patent Term Restoration Act of 1984 (hereinafter called the "Act"), 
        including notices pursuant

                                  -11-
<PAGE>12

        to 101 and 103 of the Act from Persons who have filed a biological
        license application ("BLA") or an abbreviated new drug application
        ("ANDA"), whichever is applicable. Such notices shall be given 
        promptly, but in any event within five (5) calendar days of each such 
        patent's date of issue or receipt of each such notice pursuant to the 
        A
ct, whichever is applicable. CISTRON shall notify PMC of each filing 
        for patent term restoration under the Act, any allegations of failure 
        to show due diligence and all awards of patent term restoration 
        (extensions) with respect to the OPTIONED PATENTS.

	Likewise, CISTRON or PMC, as the case may be, shall inform the other
        Party of patent extensions and periods of data exclusivity in the rest
        of the world regarding any PRODUCTS and more generally the Parties
        shall diligently cooperate with respect to any procedures for patent
        and period of data exclusivity extensions, such as but not limited to 
        Supplementary Protection Certificates, the above-mentioned Patent 
        Term Restoration and corresponding GATT regulations.



ARTICLE 4 - GENERAL PROVISIONS
- ------------------------------

4.1.	Confidentiality
        ---------------

	(a) -	General
                -------

                Except as expressly set forth in this Section 4.1., each Party
                shall cause its respective Affiliates, officers, directors, 
                employees, agents and subcontractors (collectively, 
                "Representatives") to keep confidential any and all technical,
                commercial, scientific and other data, processes, documents or
                other information (whether in oral or written form) or physical
                object (including, without limitation, Biological Materials, 
                intellectual property, marketing data, agreements between any 
                Party and a  Third-Party, license applications, and business 
                plans and projections of any Party) acquired from the other
                Party (the "Other Party"), its Affiliates or its
                Representatives prior to or after the date of this Agreement
                and which relates (in the case of a Party) to the Other Party
                or any of its Affiliates or their respective businesses
                ("Confidential Information"), and each Party shall not disclose
                directly or indirectly, and shall cause its Representatives not
                to disclose directly or indirectly, any Confidential
                Information to anyone outside such Person, such Affiliates and
                their respective Representatives, except that the foregoing
                restriction shall not apply to any information disclosed
                hereunder to any Party, if such Person (the "Receiving Person")
                can demonstrate that such Confidential Information:

                (i)   is or hereafter becomes generally available to the trade
                      or public other than by reason of any breach or default
                      by the Receiving Person, any of its Affiliates or any
                      Representative of the foregoing with respect to a
                      confidentiality obligation under this Agreement;

                (ii)  was already known to the Receiving Person or such
                      Affiliate or Representative;

                (iii) is disclosed to the Receiving Person or such Affiliate
                      or Representative by a Third-Party who has the right to
                      disclose such information;

                (iv)  based on such Person's good faith judgement with the
                      advice of counsel, is otherwise required to be disclosed
                      in compliance with applicable legal requirements to a
                      public authority such as, without limitation, the US
                      Food & Drug Administration (FDA), the European Medicine
                      Evaluation Agency (EMEA), the French Agence du Medicament
                      or any comparable authority of any country having
                      jurisdiction. 

		Whenever the Receiving Person becomes aware of any state of
                facts which would or might result in disclosure of Confidential
                Information pursuant to subparagraph (iv)

                                  -12-
<PAGE>13
                above with the exception of the case here below referred to
                in Section 4.1.(g) in fine, it shall, if possible, promptly
                notify the Person making disclosure (the "Disclosing Person")
                prior to any such disclosure so that the Disclosing Person may
                seek a protective order or other appropriate remedy and/or
                waive compliance with the provisions of this Agreement.

		In any event, if the Receiving Person is unable to promptly 
                notify the Disclosing Person or if such protective order or
                other remedy is not obtained, or if the Disclosing Person
                waives compliance with the provisions of this Agreement, the
                Receiving Person shall furnish only that portion of the
                information which it is advised by counsel is legally required
                and shall exercise reasonable efforts to obtain assurance that
                confidential treatment shall be accorded the Confidential
                Information.

                Each Party shall be entitled, in addition to any other right or
                remedy it may have, at law or in equity, to an injunction, 
                without the posting of any bond or other security except as 
                required by the relevant laws, enjoining or restraining the
                other Party from any violation or threatened violation of this
                Section 4.1.

	(b) -	Use of Confidential Information
                -------------------------------

                Each Party agrees that no Confidential Information shall:

                (i)   be used in its own business except as necessary to the 
                      fulfilment of the rights and obligations of such Party
                      under this Agreement;

                (ii)  be assigned, licensed, sublicensed, marketed, transferred
                      or loaned, directly or indirectly to any Third-Party
                      other than a Representative or an Affiliate
                      Representative of such Party, except as necessary to the
                      fulfilment of the rights and obligations of the Parties
                      under this Agreement;

                (iii) be used or exploited by such Party or any of its
                      Affiliates or their Representatives for its or their
                      respective benefit or the benefit of any other
                      relationships with customers of such Party and its
                      Affiliates.

                Without limiting the generality of the foregoing, each Party 
                agrees that, it shall not (and shall not permit any of its 
                Affiliates) at any time use any Confidential Information in
                the conduct of its business without the prior written consent
                of the Other Party. 

                The obligations set forth in this Section 4.1. shall extend to
                copies, if any, of Confidential Information made by any 
                Representatives referred to in paragraph (a) and to documents 
                prepared by such Persons which embody or contain Confidential 
                Information.

	(c) -	Protection of Confidential Information
                --------------------------------------

		Each Party shall deal with Confidential Information so as to 
                protect it from disclosure with a degree of care not less than
                that used by it in dealing with its own information intended
                to remain exclusively within its knowledge and shall take
                reasonable steps to minimise the risk of disclosure of
                Confidential Information which shall include, without
                limitation, ensuring that only its Affiliates and its and
                their Representatives who have a bona fide "need to know" such
                Confidential Information for purposes permitted or contemplated
                by this Agreement shall have access thereto. Each Party, shall
                notify all of its Representatives who have access to
                Confidential Information of its confidentiality and the care
                therefor required, and shall obtain from any Affiliate or any
                agent or subcontractor who is a Representative that is
                permitted access to such Confidential Information in accordance
                with this Section 4.1. an agreement of confidentiality
                incorporating the restrictions set forth herein.

                                   -13-
<PAGE>14

	(d) -	Survival of Obligations
                -----------------------

                The obligations set forth in this Section 4.1. shall survive
                the termination of this Agreement for a period of five (5)
                years.

	(e) -	Return of Confidential Information
                ----------------------------------

                Within thirty (30) days after the termination of this
                Agreement, the  Receiving Person shall (and shall cause its
                Affiliates' Representatives and its Affiliates to) return to
                the Disclosing Person or destroy all related documents and
                tangible items (including but not limited to unused Biological
                Materials) then in its possession which it has received from
                the Disclosing Person or any Affiliate or Representative
                thereof pertaining, referring or relating to the Disclosing
                Person's Confidential Information, as well as all copies,
                summaries, records, descriptions, modifications, and
                duplications that it, or any of its Affiliates or
                Representatives, has made from the documents or tangible items
                received from the Disclosing Person or any Affiliate or
                Representative thereof; provided, however, that the Receiving
                Person may retain one copy of each document in its legal files
                solely to permit the Receiving Person to continue to comply
                with its obligations hereunder and, in addition, may upon
                notice to the Disclosing Person, retain in its legal files
                or in the office of outside legal counsel one copy of any
                document solely for use in any pending legal proceeding to
                which such document relates.

        (f) -   Publications
                ------------

		Each Party shall have the right to publish or present the
                results of the Research Program or of any research related
                to the Field of Use and announce scientific progress of the
                Research Program, provided such publication, presentation or
                announcement (and any revisions thereof, a "Publication") is
                submitted to the other Party at least sixty (60) days prior
                to submitting it to any Third-Party (including any editing
                Person). The other Party shall have sixty (60) days after
                receipt of the draft Publication to review and comment on
                such draft. Upon notice within such sixty (60) day period by
                the other Party that such Party reasonably believes the
                Publication would amount to the public disclosure of a
                patentable  JOINT INVENTION upon which a patent application
                should be filed prior to any such disclosure, submission of
                the concerned Publication to Third Parties shall be delayed
                for a ninety (90) day period from the date of said notice, or
                for such longer period which may appear necessary for
                appropriately drafting and filing a patent application covering
                such invention. In addition, each Party shall duly take into
                account comments made by the other Party on any Publication and
                shall accept to have employees or others acting on behalf of
                the other Party be mentioned as co-authors on any Publication
                describing results to which such Persons shall have
                contributed.  The terms of this paragraph may be modified from
                time to time in accordance with the Sponsored Research
                Agreement with Duke University dated September 1, 1998.

	(g) -	Press Releases  and other Disclosures to Third Parties.
                --------------

                Neither CISTRON nor PMC shall, without the prior written
                consent of the other, issue any press release or make any other
                public announcement or furnish any statement to any Person
                (other than either Party's respective Affiliates) concerning
                the existence of this Agreement and the transactions
                contemplated by this Agreement, except for (i) general
                statements referring to the existence of this Agreement,
                specifying  its nature (Research Collaboration and License
                Option), the Field of Use and identity  of the Parties but no
                other details, (ii) disclosures made in compliance with
                Section 4.1.(a) hereof, (iii) attorneys, consultants, and
                accountants retained to represent them in connection with the
                transactions contemplated hereby or as may be reasonably
                necessary to either Party's bankers, investors, attorneys or
                other professional advisers in connection with a merger or
                acquisition, provided such advisors are bound by
                confidentiality obligations essentially identical to those
                provided for herein, and (iv) occasional, brief comments by
                the respective executive officers of both Parties consistent
                with such guidelines for public statements as may be mutually
                agreed by the Parties made in connection with routine
                interviews with analysts or members of

                                   -14-
<PAGE>15
                the financial press. In addition, either Party (after
                consultation with counsel) in its own right may make such
                further announcements and disclosures, if any, as may be
                required by applicable security laws and regulations (such as,
                without limitation, regulations of the US Securities &
                Exchange Commission (SEC) or the French Commission des
                Operations de Bourse (COB), or any equivalent authority of any
                country having jurisdiction), in which case the Party making
                the announcement or disclosure shall use its best efforts to
                give advance notice to, and discuss such announcement or
                disclosure with, the other Party and such other Party's
                attorneys.

4.2.	Term and termination.
        ---------------------

4.2.1.	Expiration.
        -----------

	This Agreement shall terminate on the third (3rd) anniversary of the 
        Effective Date.


4.2.2.	Termination for Cause.
        ----------------------

        (i)  Either Party may terminate this Agreement, at its option, upon
             or after the breach of any material provision of the Agreement
             by the other Party, if such breaching Party has not cured such 
             breach within ninety (90) days after written notice thereof from 
             the other Party.

        (ii) Subject to any applicable bankruptcy law of public order, PMC or 
             CISTRON may terminate this Agreement upon written notice to the 
             other Party if the other Party makes a general assignment for 
             the benefit of creditors, is the subject of proceedings in 
             voluntary or involuntary bankruptcy or has a receiver or trustee 
             appointed for substantially all of its property ; provided that 
             in the case of an involuntary bankruptcy proceeding such right 
             to terminate shall only become effective if the other Party 
             consents thereto or such proceeding is not dismissed within 
             ninety (90) days after the filing thereof.
 

4.2.4.	Effect of Expiration and Termination.
        -------------------------------------

	Expiration or termination of the Agreement shall not relieve the 
        Parties of any obligation accruing prior to such expiration or 
        termination. The provisions of Sections 2.2.4, 2.2.5, 3.6, 3.7, 3.8, 
        4.3, 4.4, 4.7.1, 4.7.2, 4.7.4 and 4.7.6 to 4.7.9 included, and 
        Articles 1 and 4, shall survive the expiration or termination of the 
        Agreement for their own term or for so long as such provisions have 
        to remain operative so as to give full effect to the intent of the 
        Parties with respect thereto.


4.3.	Indemnity.
        ----------

4.3.1.	Direct Indemnity.
        -----------------

4.3.1.1. Each Party shall indemnify and hold harmless the other Party, its 
        Affiliates, and their respective directors, officers, shareholders, 
        agents, consultants and employees from and against all Third-Party 
        claims, demands, liabilities, damages (including damages directly or 
        indirectly suffered by the other Party and/or its Affiliates and 
        their respective directors, officers, shareholders, agents, 
        consultants and employees) and expenses, including attorneys' fees 
        and costs (collectively, the "Liabilities") arising out of the breach 
        of any material provision of this Agreement by the indemnifying Party 
        or caused by an intentional act or omission of the indemnifying 
        Party.

                                   -15-
<PAGE>16

4.3.1.2. PMC shall defend, indemnify and hold harmless CISTRON, its
        Affiliates, and their respective directors, officers, shareholders, 
        agents, consultants and employees, from and against all Liabilities 
        suffered or incurred arising out of any Third-Party claims in 
        connection with the manufacture, design, testing, possession, 
        distribution, use, sale or other disposition by or through PMC, its 
        Affiliates or Sublicensees of any PRODUCTS, except in each case to 
        the extent such Liabilities resulted from the gross negligence, 
        recklessness or intentional acts or omissions by CISTRON.

4.3.2.	Procedure.
        ----------

	A Party (the "Indemnitee") that intends to claim indemnification
        under this Section 4.3. shall promptly notify the other Party (the 
        "Indemnitor") of any Liability or action in respect of which the 
        Indemnitee intends to claim such indemnification, and the Indemnitor 
        shall have the right to participate in, and, to the extent the 
        Indemnitor so desires, jointly with any other Indemnitor similarly 
        noticed, to assume the defense thereof with counsel selected by the 
        Indemnitor ; provided, however, that the Indemnitee shall have the 
        right to retain its own counsel, with the fees and expenses to be 
        paid by the Indemnitor, if representation of such Indemnitee by the 
        counsel retained by the Indemnitor would be inappropriate due to 
        actual or potential differing interests between such Indemnitee and 
        any other Party represented by such counsel in such proceedings. 

	The indemnity obligations under this Section 4.3. shall not apply to 
        amounts paid in settlement of any loss, claim, damage, liability or 
        action if such settlement is effected without the consent of the 
        Indemnitor, which consent shall not be withheld unreasonably. The 
        failure to deliver notice to the Indemnitor within a reasonable time 
        after the commencement of any such action, if prejudicial to its 
        ability to defend such action, shall relieve such Indemnitor of any 
        liability to the Indemnitee under this Section 4.3. The Indemnitee, 
        its Affiliates, employees and agents, shall cooperate fully with the 
        Indemnitor and its legal representatives in the investigation of any 
        action, claim or liability covered by this indemnification.


4.4.	Force Majeure.
        --------------

        No Party (or any of its Affiliates) shall be held liable or 
        responsible to the other Party (or any of its Affiliates) nor be 
        deemed to have defaulted under or breached the Agreement for failure 
        or delay in fulfilling or performing any term of the Agreement when 
        such failure or delay is caused by or results from causes beyond the 
        reasonable control of the affected Party (or any of its Affiliates) 
        including but not limited to fire, floods, embargoes, war, acts of 
        war (whether war be declared or not), insurrections, riots, civil 
        commotions, strikes, lockouts or other labor disturbances, acts of 
        God or acts, omissions or delays in acting by any governmental 
        authority or the other Party (collectively, "Events of Force 
        Majeure") ; provided, however, that the affected Party (i) shall 
        immediately notify the other Party of the occurrence of any such 
        Event of Force Majeure and (ii) shall exert all reasonable efforts to 
        eliminate, cure or overcome any such Event of Force Majeure and to 
        resume performance of its covenants with all possible speed ; and 
        provided, further, that nothing contained herein shall require any 
        Party to settle on terms unsatisfactory to such Party any strike, 
        lockout or other labor difficulty, any investigation or proceeding by 
        any governmental authority or any litigation by any Third-Party. 
        Notwithstanding the foregoing, to the extent that an Event of Force 
        Majeure continues for a period in excess of six (6) months, the 
        affected Party shall promptly notify in writing the other Party of 
        such Event of Force Majeure and within four (4) months of the other 
        Party's receipt of such notice, the Parties agree to negotiate in 
        good faith either (i) to resolve the Event of Force Majeure, if 
        possible, (ii) to extend by mutual agreement the time period to 
        resolve, eliminate, cure or overcome such Event of Force Majeure, 
        (iii) to amend this Agreement to the extent reasonably possible, or 
        (iv) to terminate this Agreement.

                                   -16-
<PAGE>17

4.5.	Assignment.
        -----------

        This Agreement in its entirety may not be assigned or otherwise 
        transferred, nor, except as expressly provided hereunder, may any 
        right or obligations pertaining to the Field of Use hereunder be 
        assigned or transferred to any Third-Party by either Party without the
        consent of the other Party ; provided, however, that either Party may,
        without such consent, assign this Agreement and its rights and 
        obligations hereunder to any of its Affiliates or in connection with 
        the transfer or sale of all or substantially all of its business, or 
        in the event of its merger or consolidation or change in control or 
        similar transaction. Any permitted assignee shall assume all 
        obligations of its assignor under this Agreement. Without limiting the
        generality of the foregoing, without the prior written consent of PMC,
        CISTRON shall not under any circumstances assign or transfer any 
        CISTRON Technology in the Field of Use unless (i) all of the rights 
        and obligations of CISTRON under this Agreement are assigned to the 
        same transferee(s) concurrently therewith, and (ii) such transferee(s) 
        expressly assume(s) in writing the performance of all terms and 
        conditions of this Agreement to be performed by CISTRON and such 
        assignment shall not relieved the assignor of any of its obligations 
        under this Agreement. Each Party acknowledges that the other Party 
        would suffer irreparable injury in the event of any breach of this 
        Article 4.5. that therefore the remedy at law for any breach or 
        threatened breach hereof by any Party shall be inadequate. 
        Accordingly, upon a breach or threatened breach hereof by any Party, 
        the other Party shall, in addition and without prejudice to any other 
        rights and remedies it may have, be entitled as a matter of right, 
        without proof of actual damages, to seek specific performance hereof 
        and to such other injunctive or equitable relief to enforce, or 
        prevent any violations (whether anticipatory, continuing or future) 
        hereof.


4.6.	Severability.
        -------------

        Each Party hereby agrees that it does not intend to violate any public
        policy, statutory or common laws, rules, regulations, treaty or 
        decision of any government agency or executive body thereof of any 
        country or community or association of countries. Should one or more 
        provisions of this Agreement be or become invalid, the Parties hereto 
        shall substitute, by mutual consent, valid provisions for such invalid
        provisions which valid provisions in their economic effect are 
        sufficiently similar to the invalid provisions that it can be 
        reasonably assumed that the Parties would have entered into this 
        Agreement with such provisions. In case such provisions cannot be 
        agreed upon, the invalidity of one or several provisions of this 
        Agreement shall not affect the validity of this Agreement as a whole, 
        unless the invalid provisions are of such essential importance to this
        Agreement that it is to be reasonably assumed that the Parties would 
        not have entered into this Agreement without the invalid provisions.


4.7.	Miscellaneous.
        --------------

4.7.1.	Notices.
        --------

	Any consent, notice or report required or permitted to be given or
        made under this Agreement by one of the Parties hereto to the other
        shall be in writing, delivered Personally or by facsimile (and
        promptly confirmed by Personal delivery, first class air mail or
        courier), first class air mail or courier, postage prepaid (where
        applicable), addressed to such other Party at its address indicated
        below, or to such other address as the addressee shall have last
        furnished in writing to the addressor and (except as otherwise
        provided in this Agreement) shall be effective upon receipt by the
        addressee.


        If to CISTRON :

        Cistron Biotechnology, Inc.
        101 Bloomfield Avenue
        Pine Brook, NJ  07058

                                   -17-
<PAGE>18

        Attention:  Chairman 
        Telecopier: (973) 575-4854
							
        with a copy to:

        Seth I. Truwit, Esq.
        Epstein Becker & Green, PC
        250 Park Avenue
        New York, NY  10177
        Telephone:  (212) 351-4709
        Telecopier:  (212) 661-0989


        If to PMC :

        Pasteur Merieux Serums & Vaccins, S.A.
        58, avenue Leclerc
        69007 Lyon, France
        Attention:  Senior Vice President, Legal and Corporate Affairs
        Telecopier:  011 33 4 72 73 77 84

        Pasteur Merieux Connaught - USA 
        Route 611
        Swiftwater, PA  18370
        Attention:  Vice President, Business Development
        Telecopier:  (717) 839-4600

        and

        Akin, Gump, Strauss, Hauer & Feld, LLP
        590 Madison Avenue
        New York, New York 10022
        Attention:  L. Kevin O'Mara, Jr., Esq.
        Telephone:  (212) 872-1021
        Telecopier:  (212) 872-1002


4.7.2.	Applicable Law.
        ---------------

	The Agreement shall be governed by and construed in accordance with 
        the laws of State of New-York., without regard to the conflict of law
        principles thereof.


4.7.3.	Representations, warranties and covenants.
        ------------------------------------------

4.7.3.1. Representations and Warranties of PMC.
         --------------------------------------

        (a) PMC is a Societe Anonyme duly organized and existing under the 
            laws of France, with the corporate power to own, lease and operate
            its properties and to carry on its business as now conducted.

        (b) PMC has all necessary corporate power and authority to enter into 
            this Agreement and to consummate the transactions contemplated 
            hereby.

        (c) The execution, delivery and performance of this Agreement by PMC 
            does not conflict with or contravene the statuts of PMC nor shall 
            the execution, delivery or performance of this Agreement conflict 
            with or result in a breach of, or entitle any Party thereto to 
            terminate, any material agreement or instrument to which PMC is a 
            Party, or by which any of its assets or properties is bound.

                                   -18-
<PAGE>19

        (d) This Agreement has been duly authorized, executed and delivered 
            by PMC and constitutes a legal, valid and binding agreement of 
            PMC, enforceable against PMC in accordance with its terms, except 
            as enforceability may be limited by bankruptcy, insolvency, 
            moratorium, reorganization or other similar laws affecting 
            creditors' rights generally.


4.7.3.2. Representations, Warranties and Covenants of CISTRON.
         -----------------------------------------------------

        (a) CISTRON is a corporation duly incorporated and validly existing 
            as a corporation in good standing under the laws of the State of 
            Delaware with the corporate power to own, lease and operate its 
            properties and to carry on its business as now conducted.

        (b) CISTRON has all necessary corporate power and authority to enter 
            into this Agreement and to consummate the transactions 
            contemplated hereby.

        (c) The execution, delivery and performance of this Agreement by 
            CISTRON does not conflict with or contravene its certificate of 
            incorporation or by-laws, nor shall the execution, delivery or 
            performance of this Agreement conflict with or result in a breach 
            of, or entitle any Party thereto to terminate, any material 
            agreement or instrument to which CISTRON is a Party, or by which 
            any of its assets or properties is bound.
        
        (d) This Agreement has been duly authorized, executed and delivered 
            by CISTRON and constitutes a legal, valid and binding agreement of
            CISTRON, enforceable against CISTRON in accordance with its terms,
            except as enforceability may be limited by bankruptcy, insolvency,
            moratorium, reorganization or other similar laws affecting 
            creditors' rights generally.

        (e) All OPTIONED PATENTS listed on Schedule A as amended from time to 
            time, but for the purpose of this Section 4.7.3.2 and for such 
            purpose only excluding any Joint Patent Rights, have been 
            registered in, filed in or issued by the appropriate patent 
            offices of each jurisdiction as indicated on such Schedule A, and 
            in each case is currently in effect and all maintenance fees and 
            renewals thereof have been duly made with respect thereto. CISTRON
            owns or has full and exclusive rights to use and exploit under 
            licenses (and to license or sublicense) all its rights under such 
            OPTIONED PATENTS and the OPTIONED KNOW-HOW. Except as set forth on
            Schedule 4.7.3(e) hereto, there have been no material claims made 
            against CISTRON asserting the invalidity or non-enforceability of,
            or with respect to such OPTIONED PATENTS , the misuse of such 
            OPTIONED PATENTS or the OPTIONED KNOW-HOW, nor is CISTRON aware 
            that any such claims exist.  Except as set forth on Schedule 
            4.7.3(e) hereto, CISTRON has not received a notice of conflict of 
            such OPTIONED PATENTS or the OPTIONED KNOW-HOW with the asserted 
            rights of others, or otherwise challenging its rights to use any 
            of such OPTIONED PATENTS, or the OPTIONED KNOW-HOW. 
        

            None of the rights of CISTRON under the OPTIONED PATENTS or 
            OPTIONED KNOW-HOW shall be adversely affected by the execution, 
            delivery or performance of this Agreement, or the consummation of 
            the transaction contemplated herein. EXCEPT AS OTHERWISE EXPRESSLY
            SET FORTH IN THIS SECTION, NEITHER PARTY MAKES ANY REPRESENTATION
            OR EXTENDS ANY WARRANTIES OF ANY KIND EITHER EXPRESS OR IMPLIED, 
            INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, 
            FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, OR VALIDITY OF 
            ANY PATENT RIGHTS ISSUED OR PENDING.
        
                                    -19-
<PAGE>20

4.7.4.	Dispute Resolution.
        -------------------

	The Parties agree that if any dispute or disagreement arises between 
        PMC on the one hand and CISTRON on the other in respect of this 
        Agreement, they shall follow the following procedure in an attempt to 
        resolve the dispute or disagreement.

        (a) The Party claiming that such a dispute exists shall give notice 
            in writing ("Notice of Dispute") to the other Party of the nature 
            of the dispute;

        (b) Within twenty eight (28) business days of receipt of a Notice of 
            Dispute, a nominee or nominees of PMC and a nominee or nominees 
            of CISTRON shall meet in Person and exchange written summaries 
            reflecting, in reasonable detail, the nature and extent of the 
            dispute, and at this meeting they shall use their reasonable 
            endeavours to resolve the dispute ;
        
        (c) If, within a further period of twenty eight (28) business days, 
            the dispute has not been resolved or if, for any reason, the 
            required meeting has not been held, then the Parties agree that 
            any dispute shall be referred to an arbitrator appointed by 
            agreement of CISTRON and PMC or, if no such agreement is reached 
            within sixty (60) business days after a Party commences the 
            arbitration, then by a panel of three arbitrators, with each of 
            PMC and CISTRON to select one arbitrator and those two 
            arbitrators to select the third. If all three arbitrators have 
            not been selected within sixty (60) business days after a Party 
            commences the arbitration, then the Parties agree to abide by the 
            selection of the remaining arbitrator to be named by a 
            representative of the International Chamber of Commerce. 

            The Parties agree that the Rules of the International Chamber of 
            Commerce shall govern such arbitration and that any decision of 
            the arbitrators shall be final and binding and shall be 
            enforceable in any court of competent jurisdiction worldwide 
            (regardless of whether one of the Parties fails or refuses to 
            participate in the arbitration). The Parties agree that all 
            arbitrations shall be conducted in the English language and that 
            the exclusive venue of all arbitrations shall be in Zurich, 
            Switzerland. The Party determined by the arbitrators to be the 
            Party substantially prevailing in the arbitration shall be 
            entitled to recover its legal and consultants' fees and other 
            costs reasonably incurred in connection with the arbitration (as 
            determined by the arbitrators) ; and

        (d) in the event of a dispute regarding any payments owing under this 
            Agreement, all undisputed amounts shall be paid promptly when due 
            and the balance, if any, promptly after resolution of the 
            dispute.


4.7.5.	Entire Agreement.
        -----------------

	This Agreement contains the entire understanding of the Parties with 
        respect to the subject matter hereof. All express or implied 
        agreements and understandings, either oral or written, heretofore 
        made, including but not limited to Option Agreements to the extent, 
        but only to the extent, they are inconsistent with any provisions of 
        this Agreement (in which case the relevant provision of this 
        Agreement shall prevail) are expressly superseded by this Agreement. 
        This Agreement may be amended, or any term hereof modified, only by a 
        written instrument duly executed by both Parties hereto.


4.7.6.	Independent Contractors.
        ------------------------

	CISTRON and PMC each acknowledge that they shall be independent 
        contractors and that the relationship between the two Parties shall 
        not constitute a partnership, joint venture or agency. Neither 
        CISTRON nor PMC shall have the authority to make any statements, 
        representations or commitments of any kind, or to take any action, 
        which shall be binding on the other Party, without the prior consent 
        of the other Party to do so.

                                   -20-
<PAGE>21

4.7.7.	Affiliates.
        -----------

	Each Party shall cause its respective Affiliates to comply fully with 
        the provisions of this Agreement to the extent such provisions 
        specifically relate to, or are intended to specifically relate to, 
        such Affiliates, as though such Affiliates were expressly named as 
        joint obligors hereunder.


4.7.8.	Waiver.
        -------

	The waiver by either Party hereto of any right hereunder or the 
        failure to perform or of a breach by the other Party shall not be 
        deemed a waiver of any other right hereunder or of any other breach 
        or failure by said other Party whether of a similar nature or 
        otherwise.


4.7.9.	No Implied License.
        -------------------

	Nothing in this Agreement shall be deemed to constitute, by
        implication or otherwise, the grant by PMC to CISTRON, or by CISTRON 
        to PMC, of any license to, or interest in, or other rights under any 
        patent, patent application, proprietary know-how, trade secrets or 
        other intellectual property rights owned or possessed by PMC or 
        CISTRON, whichever is applicable, except as expressly provided for 
        herein.


4.7.10.	Counterparts.
        -------------

	This Agreement may be executed in two or more counterparts, each of 
        which shall be deemed an original, but all of which together shall 
        constitute one and the same instrument.


                                 -21-
<PAGE>22

IN WITNESS WHEREOF, the Parties have executed this Agreement as of the date 
first set forth above.


For CISTRON BIOTECHNOLOGY, INC. 

 
By :  /s/BRUCE C. GALTON
     -------------------
Name : BRUCE C. GALTON
Title : Chairman of the Board and
        Chief Executive Officer


For PASTEUR MERIEUX Serums & Vaccins S.A.




By : /s/DAVID J. WILLIAMS
     --------------------
Name : DAVID J. WILLIAMS
Title : President and
        Chief Operating Officer

- -----------------------
                                 -22-
<PAGE>23

                        EXHIBIT-2
                        ---------

Confidential treatment has been requested for portions of the exhibit. The 
copy filed herewith omits the information subject to the confidentiality 
request.  Omissions are designated as ["xxxxx"].  The portions omitted have 
been filed separately with the Securities and Exhange Commission pursuant 
to such request for confidential information.

                     --------------------------------------

                             LICENSE AGREEMENT

                                 IL-1 BETA

                     --------------------------------------

This Agreement is entered this 30th day of October, 1998 (the "Effective 
Date") into by and between :

       CISTRON BIOTECHNOLOGY, INC., a corporation organized and existing under
       the laws of the State of Delaware, having its principal place of 
       business at 10, Bloomfield Avenue, Pine Brook, New Jersey 07058, USA

       (hereinafter referred to as "CISTRON")

and
- ---
       PASTEUR MERIEUX Serums & Vaccins - a Pasteur Merieux Connaught Company
       -, a societe anonyme organized and existing under the laws of the
       French Republic, having its registered head office at 58, avenue
       Leclerc, 69007, Lyon, France, 

       (hereinafter referred to as "PMC")

                                WITNESSETH
                                ----------

WHEREAS, CISTRON has developed intellectual property, including inventions 
which are the subject matter of patents and patent applications and secret 
and substantial know-how, relating to a cytokine called Interleukin 1 beta 
("IL-1b" or the "FACTOR") used as an immunoadjuvant ;

WHEREAS, PMC and CISTRON are parties to the Collaboration & Option 
Agreement dated October 30th, 1998, under which PMC has exercised its option 
to obtain from CISTRON a license in order to have the right to use CISTRON' 
inventions relating to the FACTOR for use as an adjuvant in human vaccines, 
and CISTRON has agreed to grant such licenses to PMC, subject to the terms 
of and conditioned upon this Agreement ;


NOW, THEREFORE, in consideration of the respective representations and 
covenants of each of the Parties as set forth below, CISTRON and PMC, 
intending to be legally bound, agree as
follows :
                                 -23-
<PAGE>24

ARTICLE I - DEFINITIONS AND INTERPRETATION
- ------------------------------------------

1.1.	Definitions : For the purposes of this Agreement the following words 
        and phrases shall have the following meanings :

        (a)     "Affiliate" means, with respect to any Person, (i) any other 
                Person of which the securities or other ownership interests 
                representing fifty per cent (50 %) or more of the equity or 
                fifty per cent (50 %) or more of the ordinary voting power or 
                fifty per cent (50 %) or more of the general partnership
                interest are, at the time such determination is being made,
                owned, Controlled or held, directly or indirectly, by such
                Person (a "Subsidiary"), or (ii) any other Person which, at
                the time such determination is being made, is Controlling or
                under common Control with, such Person. As used herein, the
                term "Control", whether used as a noun or verb, refers to the
                possession, directly or indirectly, of the power to direct, or
                cause the direction of, the management or policies of a
                Person, whether through the ownership of voting securities,
                by contract or otherwise.

        (b)     "Agreement" means this agreement, all amendments and
                supplements to this Agreement and all schedules to this
                Agreement, including the following :

                Schedule A -    LICENSED PATENTS.
                ----------
                Exhibit 1  -    Tax Form re. French Withholding Tax.
                ---------
        (c)     "Biological Materials" shall mean any biological materials 
                including but not limited to structural genes, genetic 
                sequences, promoters, enhancers, probes, linkage probes, 
                vectors, hosts, plasmids, peptides, polypeptides, transformed 
                cell lines, transgenic animals, proteins, biological modifiers,
                antigens, reagents, hybridomas, antibodies, toxins, lectins, 
                enzymes, lipids, hormones, viruses, cells or parts of cells, 
                cell lines, fragments of any of the foregoing and any other 
                biologically active material or compound, whether or not 
                occurring naturally or howsoever derived, modified, conjugated,
                cross-linked, immobilized, reduced, purified or produces, 
                whether by recombinant DNA techniques and/or otherwise.

        (d)     "Calendar Quarter" means any of the three-month periods 
                beginning January 1, April 1, July 1 and October 1 in any year.

        (e)     "CISTRON Improvements" means Improvements which are conceived 
                during the term of this Agreement solely or jointly by 
                employees and/or contractors (other than PMC) acting on behalf
                of CISTRON or its Affiliates, to the extent that CISTRON has 
                now or hereafter shall have the right to grant licenses, 
                immunities or other rights thereon.

        (f)     "CISTRON Technology" means the LICENSED PATENTS, the LICENSED 
                KNOW-HOW and the CISTRON  Improvements, and shall include 
                CISTRON's interest in any Joint Inventions as such latter term
                is defined under the Collaboration & Option Agreement and under
                this Agreement .

        (g)     "Collaboration & Option Agreement" means the Collaboration & 
                Option Agreement signed by the Parties hereto on October 30th,
                1998.

        (h)     "Confidential Information" has the meaning ascribed to it in 
                Section 8.1. of this Agreement.

                                   -24-
<PAGE>25

        (i)     "Event of Force Majeure" has the meaning ascribed to it in 
                Article 8.4. of this Agreement.

        (j)     "FACTOR" means the cytokine (a protein) called Interleukin 1 
                beta, or IL-1b, as described in the LICENSED PATENTS, and any 
                derivatives thereof, and is intended to refer to both the 
                protein itself and the gene encoding thereto.

        [OPTIONAL : will depend on how Option is exercised.

        (k)     "Field of Preventative Vaccines" means the field comprised of 
                bio-pharmaceutical products for the prevention through active 
                immunization against infectious diseases and/or cancers in 
                humans.

        (l)     "Field of Therapeutic Vaccines" means the field comprised of 
                bio-pharmaceutical products for the immunotherapy through 
                active immunization against infectious diseases and/or cancers 
                in humans.

        (m)     "Field of Use" means either the Field of the Therapeutic 
                Vaccines or the Field of the Preventative Vacines or both.]

        (n)     "First Commercial Sale" means, in each country of the 
                Territory, the first sale of a PRODUCT by PMC, its Affiliates 
                or Sublicensees, to Third-Parties, in each case for use or 
                consumption of such PRODUCT in such country by the general 
                public.

        (o)     "Improvements" means all patentable and non-patentable 
                inventions, discoveries, technology and information of any type
                whatsoever, including without limitation Biological Materials,
                methods, processes, technical information, knowledge, 
                experience and know-how which are made during the term of this
                Agreement and which utilize, incorporate, are derived from or 
                are based on, CISTRON Technology, or could not be conceived, 
                developed or reduced to practice but for the use of the CISTRON
                Technology.

        (oo)    "Joint Inventions" have the meaning ascribed to them in Section
                7.2. hereof.

        (p)     "LICENSE" has the meaning ascribed to it in Section 2.1.1. of 
                this Agreement.


        (q)     "LICENSED KNOW-HOW" means any and all technical information, 
                discoveries, improvements, processes, formulae, data, 
                engineering, technical and shop drawings, inventions, 
                Biological Materials, shop-rights, know-how and trade secrets 
                which is useful or necessary to make, have made, use or sell 
                the FACTOR and/or PRODUCTS or to practice under the LICENSED 
                PATENTS in the Field of Use, which have been, or hereafter are,
                either developed by CISTRON or its Affiliates, or the rights to
                which in the Field of Use have been acquired by CISTRON or its
                Affiliates and to which CISTRON or its Affiliates have a 
                transferable interest. LICENSED KNOW-HOW expressly includes any
                and all technology developed in the Field of Use by the Parties
                pursuant to and in accordance with the Collaboration & Option 
                Agreement and which constitutes Joint Inventions as such term 
                is defined in such agreement.

        (r)     "LICENSED PATENTS" means :

                (i)   any existing patents and patent applications listed in
                      Schedule A to this Agreement, including any Joint Patent
                      Rights as such term is defined in the Collaboration & 
                      Option Agreement ;

                (ii)  any future patents issued from any patent applications 
                      referred to in Paragraph 1.(r).(i) above and any future 
                      patents issued from a patent application filed in any 
                      country in the Territory which corresponds to a patent or
                      patent application identified in Paragraph 1.(r).(i)
                      above;
                                   -25-
<PAGE>26

                (iii) any reissues, confirmations, renewals, extensions, 
                      counterparts, divisions, continuations, continuations-in-
                      part, supplemental protection certificates or utility 
                      models issued, assigned or licensed to CISTRON or its 
                      Affiliates of or relating to the patents or patent 
                      applications identified in Paragraph 1.(r).(i) and (ii) 
                      above ;

                (iv)  any future patents and patent applications covering
                      CISTRON Improvements, solely or jointly owned by CISTRON
                      or its Affiliates, or licensed by CISTRON or its
                      Affiliates with the right to sublicense, and CISTRON's
                      interest in any Joint Inventions.

        (rr)    "Net Sales" shall mean gross invoice price of PRODUCTS sold by
                PMC, its Affiliates and Sublicensees to the first Third-Party 
                (including unaffiliated Third-Party distributors, except in the
                circumstances referred to in Section 6.3 hereof, and provided 
                further that where a distributor is an Affiliate, but not a 
                Subsidiary of PMC, such distributor shall be deemed a Third-
                Party for the purpose of calculating Net Sales hereunder) less,
                to the extent actually incurred or allowed and if not already 
                deducted in the amount invoiced : 

                (i)   normal or customary trade and/or quantity discounts, 
                      credits, allowances, rebates, returns (including, but not
                      limited to, wholesaler and retailer returns) ;

                (ii)  retroactive price reductions ;

                (iii) excise taxes, other consumption taxes, customs duties and
                      compulsory payments made to governmental authorities ;

                (iv)  sales commissions that are actually paid to Third-Party 
                      distributors and selling agents ; and

                (v)   transportation, transit and insurance for transportation
                      each to the extent separately invoiced and paid by PMC.

        (s)     "Notice of Dispute" has the meaning ascribed to it in Section 
                8.8.4.(a) of this Agreement.

        (t)     "Parties" means PMC and CISTRON, and "Party" means any one of 
                them.

        (u)     "Person" means an individual, corporation, partnership, trust,
                business trust, association, joint stock company, pool, 
                syndicate, sole proprietorship, unincorporated organization, 
                governmental authority or any other form of entity not 
                specifically listed herein.

        (v)     "Phase III" means the first large scale safety and efficacy 
                clinical trial relating to a PRODUCT.

        (w)     "PMC Improvements" means Improvements which are conceived 
                during the term of this Agreement solely or jointly by 
                employees and/or contractors (other than CISTRON) acting on 
                behalf of PMC or its Affiliates, to the extent that PMC has now
                or hereafter shall have the right to grant licenses, immunities
                or other rights thereon.

        (ww)    "PRODUCTS" means any and all vaccines or other bio-
                pharmaceutical products intended for use [in the Field of 
                Preventative Vaccines or the Field of Therapeutic Vaccines or 
                both - OPTIONAL : will depend on how Option is exercised]  
                which (i) incorporate the FACTOR as an adjuvant or (ii) more 
                generally utilize any or are based on any CISTRON Technology.

                                   -26-
<PAGE>27

        (x)     "Royalty Term" means, with respect to each PRODUCT in each 
                country in the Territory, the period of time equal to the 
                longer of (a) fifteen (15) years from the date of First 
                Commercial Sale of such PRODUCT in such country or (b) the term
                for which a Valid Patent Claim in such country remains in 
                effect and, but for a license granted by this Agreement, would
                be infringed by the manufacture, use or sale of such PRODUCT in
                the Field of Use in such country.

        (xx)    "Sublicensee" means any Person acting pursuant to a sublicense
                granted to it by PMC under the terms of this Agreement.

        (y)     "Territory" means all countries in the world.
        
        (yy)    "Third-Party" means any Person other than PMC, CISTRON and 
                their respective Affiliates.

        (z)     "Valid Patent Claim" means a claim of an issued and unexpired 
                patent or patent application included in LICENSED PATENTS which
                has not been held permanently revoked, unenforceable or invalid
                by a decision of a court or other governmental agency of 
                competent jurisdiction, unappealable or unappealed within the 
                time allowed for appeal, and which has not been admitted to be
                invalid or unenforceable through reissue or disclaimer or 
                otherwise. If there should be two or more decisions within the
                same country which are conflicting with respect to the 
                invalidity of the same claim, the decision of the highest 
                tribunal shall thereafter control. However, should the 
                tribunals be of equal authority, then the decision or decisions
                holding the claim valid shall prevail where the conflicting 
                decisions are equal in number and the majority of decisions 
                shall prevail where the conflicting decisions are not equal in
                number.


1.2.    Certain Rules of Interpretation in this Agreement and the Schedules:
        --------------------------------------------------------------------

        (a)     An accounting term not otherwise defined has the meaning 
                assigned to it by, and every accounting matter will be 
                determined in accordance with, generally accepted accounting 
                principles in the United States of America ;

        (b)     Unless otherwise specified, all references to monetary amounts
                are to United States dollars currency (US$) ;

        (c)     The descriptive headings of Articles and Sections are inserted
                solely for convenience of reference and are not intended as 
                complete or accurate descriptions of the content of such 
                Articles or Sections ;

        (d)     The use of words in the singular or plural, or with a 
                particular gender, shall not limit the scope or exclude the 
                application of any provision of this Agreement to such Person 
                or Persons or circumstances as the context otherwise permits ;

        (e)     Whenever a provision of this Agreement requires an approval or
                consent by a Party to this Agreement and notification of such 
                approval or consent is not delivered within the applicable time
                limit, then, unless otherwise specified, the Party whose 
                approval or consent is required shall be conclusively deemed to
                have withheld its approval or consent ;

        (f)     Unless otherwise specified, time periods within or following 
                which any payment is to be made or act is to be done shall be 
                calculated by excluding the day on which the period commences 
                and including the day on which the period ends and by extending
                the period to the next business day following if the last day 
                of the period is not a business day in the jurisdiction of the
                Party to make such payment or do such act ; and 

                                   -27-
<PAGE>28

        (g)     Whenever any payment is to be made or action to be taken under
                this Agreement is required to be made or taken on a day other 
                than a business day, such payment shall be made or action taken 
                on the next business day following such day in the jurisdiction 
                of the Party to make such payment or do such act.


ARTICLE 2 - LICENSE.
- --------------------

2.1.	Grant.
        ------

        Subject to and conditioned upon the provisions of this Agreement,
        CISTRON hereby grants to PMC, and PMC hereby accepts, a license
        (the "LICENSE") in the Territory to make, have made, use and sell 
        PRODUCTS and FACTOR under the LICENSED PATENTS in the Field of Use 
        and by using LICENSED KNOW-HOW, CISTRON Improvements and Joint 
        Inventions in the Field of Use.

2.2.	Exclusivity
        -----------

        (i)   Subject to and conditioned upon the provisions of this
              Agreement, the LICENSE granted pursuant to this Article II
              shall be exclusive (exclusive even as to CISTRON and CISTRON
              Affiliates) to PMC in the Field of Use. Without limiting the
              generality of the foregoing, CISTRON covenants that during the
              term of this Agreement, neither CISTRON nor its Affiliates shall
              grant to any other Person any right , license or privilege to
              make, have made, use or sell PRODUCTS or to otherwise exploit
              CISTRON Technology (including for the manufacturing of the
              FACTOR) and Joint Inventions in connection with such PRODUCTS in
              the Field of Use.

        (ii)  For greater certainty, CISTRON has and retains all rights in 
              and to the CISTRON Technology outside the Field of Use and PMC
              has no rights in the CISTRON Technology outside the Field of Use.


2.3.	PMC 's Rights to Sublicense 
        ---------------------------

        (i)   PMC shall have the right, with CISTRON's prior written consent
              (which consent shall not be unreasonably withheld), to 
              sublicense in the Field of Use to Third-Parties all or any 
              portion of the rights to LICENSED PATENTS and LICENSED  KNOW-
              HOW and CISTRON Improvements granted to PMC pursuant to this 
              Agreement under the LICENSE. No permitted Sublicensee pursuant 
              hereto shall have the right to grant further sublicenses to any 
              Third-Party.

        (ii)  PMC shall have the right, without obtaining the further consent 
              of CISTRON, to sublicense in the Field of Use all or any 
              portion of the rights to the LICENSED PATENTS, the LICENSED 
              KNOW-HOW and CISTRON Improvements granted to it pursuant to 
              this Agreement under the LICENSE (i) to any of its Affiliates, 
              and (ii) to any Person in any country of the Territory if 
              required to do so by any governmental authority having 
              jurisdiction in such country. No permitted Sublicensee pursuant 
              hereto shall have the right to grant further sublicenses to any 
              Third-Party.

        (iii) PMC agrees that all sublicenses granted by PMC hereunder 
              shall expressly bind Sublicensees to the terms of Article 8.1.,
              "Confidentiality" and to all other relevant provisions of this 
              Agreement. In the event PMC grants sublicenses, PMC shall still 
              be under the obligation to pay Milestone Payments to CISTRON as 
              provided for in
                                 -28-
<PAGE>29

              Section 4.6. hereof, and PMC shall pay royalties to CISTRON as
              if Net Sales of the Sublicensees were Net Sales of PMC and
              CISTRON shall be expressly made a Third-Party beneficiary
              thereof. PMC shall be responsible for the performance by any
              sub-PMC of all such terms, conditions and obligations. In
              addition PMC shall pay to CISTRON Twenty Five percent (25%) of
              any incremental consideration that PMC may receive from any
              Third-Party Sublicensee such as but not limited to license
              issue fees and milestone payments.

        (iv)  Any sublicenses granted by PMC shall include a requirement that 
              the Sublicensee maintains records and permit inspection on 
              terms essentially identical to Sections 5.1. and 5.2 hereof. At 
              CISTRON's request, PMC shall arrange for an independent 
              certified public accountant selected by CISTRON to inspect the 
              records of Sublicensees for the purpose of verifying royalties 
              due to CISTRON and shall cause such accountant to report the 
              results thereof to CISTRON.

        (v)   Any sublicenses granted by PMC shall provide for the 
              termination of the sublicense, or, if the Sublicensee is a 
              Third-Party, at the option of such Sublicensee, the conversion 
              to a license directly between such Sublicensee and CISTRON, 
              upon termination of this Agreement under Article 8.2. (other 
              than expiration under Section 8.2.1 or a termination by PMC 
              further to a breach by CISTRON pursuant to Section 8.2.3). Such 
              conversion shall be subject to CISTRON's approval and 
              contingent upon acceptance by the Sublicensee of the remaining 
              provisions of this Agreement.

        (vi)  PMC shall notify CISTRON of each sublicense granted to Third-
              Parties and shall provide CISTRON with the name and address of 
              each Sublicensee and a description of the PRODUCTS and 
              territory covered by each sublicenses.


2.4.	Sublicenses to PMC.
        -------------------

	To the extent LICENSED PATENTS have been, or shall be, licensed by 
        CISTRON from a Third-Party under an agreement with such Third-Party 
        (a "Third-Party License"), PMC understands and agrees as follows :

	(i)-	The rights sub-licensed to PMC by CISTRON are subject to the 
                terms and conditions, restrictions, limitations and obligations
                of the relevant Third-Party License ;

	(ii)-	PMC shall comply with the terms and conditions, 
                restrictions, limitations and obligations of such Third-Party 
                License(s) to the extent PMC has been permitted to review such
                terms, conditions, restrictions, limitations and obligations. 
                CISTRON shall give PMC, upon request, a reasonable opportunity
                to review the same except to the extent that confidentiality 
                obligations towards Third-Parties may prevent CISTRON from
                doing so. In any event, CISTRON shall act reasonably in
                advising PMC of the scope of PMC's obligations pursuant to any
                relevant Third-Party License.

2.5.    Licenses to CISTRON.
        --------------------

        In the event that CISTRON wishes to commercialize any PMC 
        Improvements outside the Field of Use at any time during the term of 
        this Agreement, CISTRON shall so notify PMC and the Parties agree to 
        then negotiate in good faith the terms and conditions of a license 
        to be granted by PMC to CISTRON covering such PMC Improvements, 
        including a reasonable royalty which shall reflect the value of the 
        PMC Improvements in relation to all other

                                -29-
<PAGE>30

        technology and proprietary rights included in the product and/or
        process that CISTRON wishes to commercialize.


2.5	Subcontracting.
        ---------------

	Notwithstanding anything herein provided for to the contrary, PMC 
        shall be allowed to (i) sub-contract in whole or in part PRODUCTS 
        development to Third-Parties such as, without limitation, clinical 
        research organizations, (ii) appoint sales agents and distributors 
        to market and distribute PRODUCTS and (iii) sub-contract 
        manufacturing of PRODUCTS and FACTOR with Third-Parties or with 
        PMC's Affiliates.
       
2.6.    Procedures for Provision of Know-How.
        -------------------------------------

2.6.1.	Disclosure of Technology.
        -------------------------

        From time to time during the term of this Agreement, CISTRON shall 
        disclose or cause its Affiliates to disclose to PMC such CISTRON 
        Technology as may be reasonably necessary to enable PMC to develop, 
        manufacture and commercialize PRODUCTS in the Field of Use on the 
        terms and subject to the conditions of this Agreement. In addition, 
        during the term of this Agreement, CISTRON shall, upon PMC's 
        reasonable request and with adequate notice to CISTRON, make 
        available to PMC at PMC's or its Affiliates' manufacturing 
        facilities or the facility of a Third-Party manufacturer who shall 
        have contracted with PMC to manufacture PRODUCTS, CISTRON's or 
        CISTRON Affiliate's Personnel to provide technical assistance to 
        PMC's Personnel, or PMC Affiliates' Personnel or Third-Party 
        manufacturer's Personnel. PMC shall pay or have paid by its 
        concerned Affiliates all expenses incurred by CISTRON or its 
        Affiliates in connection with such technical assistance.


2.6.2.	Communication among Parties.
        ----------------------------

	Each of PMC and CISTRON shall appoint (a) specific individual(s) who 
        shall be available and shall act as (a) liaison Person(s) to 
        facilitate the day-to-day communications among the Parties. The 
        names and addresses of the liaison Persons who shall act on behalf 
        of each of the Parties shall be provided by each of the Parties to 
        the other immediately following the execution of this Agreement. 
        Each of PMC and CISTRON agrees to notify the other in accordance 
        with the terms of Section 8.8.1. of this Agreement in the event of a 
        change in liaison Person.


2.6.3.	Identification of Know-How.
        ---------------------------

	The Parties agree that all information and Biological Materials 
        comprised in the LICENSED KNOW-HOW to be transferred to PMC pursuant 
        to this Agreement shall be so transferred in the case of written 
        information, by memoranda bearing the mention "Confidential", and, 
        in the case of Biological Materials, by clearly marked and numbered 
        containers. PMC shall designate an individual who shall be 
        responsible for receiving information and Materials

                                  -30-
<PAGE>31

        from CISTRON and/or its Affiliates and the Parties agree that such
        information and Materials shall in all cases (except where the Parties
        agree otherwise) be sent solely to the attention of such individual.
        Upon receipt of information and/or Biological Materials, the designated
        individual shall, on behalf of PMC, send an acknowledgement to 
        CISTRON and/or its Affiliates confirming receipt of information 
        and/or Biological Materials. The Parties agree that they shall in 
        good faith work together to establish and maintain a system to 
        record the transmission of information and/or materials under this 
        Agreement and make all commercially reasonable efforts to ensure 
        such system is followed.


2.6.4.	Confidentiality.
        ----------------

	All information transferred pursuant to this Agreement shall be 
        deemed to be "Confidential Information" in accordance with Section 
        8.1 hereof.


ARTICLE 3 - DEVELOPMENT AND COMMERCIALIZATION.
- ----------------------------------------------

3.1.	Development and Commercialization Efforts.
        ------------------------------------------

	PMC (i) shall use commercially reasonable efforts to diligently 
        conduct such preclinical and clinical trials that are necessary or 
        desirable to obtain all regulatory approvals to develop and 
        commercialize such PRODUCTS, (ii) shall diligently develop and 
        obtain necessary approval to market such PRODUCTS (including, as the 
        case may be, pricing approval), and (iii) shall commence marketing 
        and market such PRODUCTS in each country in which PMC has received 
        all applicable regulatory approvals therefor. PMC shall comply with 
        all applicable good laboratory, clinical and manufacturing practices 
        in the development and commercialization of such PRODUCTS, and shall 
        cause its Affiliates and subcontractors to do the same. PMC shall be 
        solely responsible for funding all costs of the development and 
        commercialization of each such PRODUCTS.

	PMC and CISTRON agree to negotiate in good faith PRODUCT development 
        milestones within ninety (90) days following execution of this 
        Agreement.


3.2.	Development and Commercialization Reports.
        ------------------------------------------

	During the term of this Agreement, PMC shall keep CISTRON reasonably 
        informed as to the progress of the development of PRODUCTS by 
        notifying CISTRON of completion of each significant step. All 
        information disclosed by PMC pursuant to this Section 3.2 shall be 
        subject to Article 8 hereof.

	PMC shall send to CISTRON at the latest before the end of the first 
        Calendar Quarter of each year during the term of this Agreement a 
        report describing in sufficient details all development and 
        commercialization efforts made by PMC pursuant hereto during the 
        preceding year.
                                   -31-
<PAGE>32

ARTICLE 4 - ROYALTIES AND MILESTONES.
- -------------------------------------

4.1.	Earned Royalties.
        -----------------

	During the Royalty Term, PMC shall pay to CISTRON a royalty of 
        ["xxxxx"] of Net Sales of PRODUCTS ; provided, however, that  the 
        royalty shall be reduced to ["xxxxx"] of Net Sales of PRODUCTS in 
        countries where there is no Valid Patent Claim and there is a 
        competitor of PMC using a formulation or formulations of the same 
        antigen(s) than PMC with an IL-1b.

4.2.	Third-Party Royalties.
        ----------------------

	If PMC, its Affiliates or Sublicensees is required to pay royalties 
        to any Third-Party in order to make, have made, use or sell a 
        PRODUCT in a country, then the royalty set-forth in Section 6.1 
        hereof for such PRODUCT in such country shall be reduced by fifty 
        percent (50%) of the amount paid by PMC to such Third-Parties ; 
        provided, however, that in no event the rate of the royalty payable 
        by PMC to CISTRON pursuant hereto shall be less than ["xxxxx"] of 
        Net Sales of such PRODUCT in such country.

4.3.	Single Royalty : Non-Royalty Sales.
        -----------------------------------

	In no event shall more than one royalty be payable under Sections 
        4.1. and 4.2. with respect to a particular unit of PRODUCTS. No 
        royalty shall be payable under this Article 6 with respect to sales 
        of PRODUCTS among PMC and its Subsidiaries, or among Sublicensees 
        and their Affiliates, or among PMC and its Sublicensees, but a 
        royalty shall be due upon the subsequent sale of the PRODUCTS to a 
        Third-Party. No royalty shall be payable for (i) PRODUCTS used in 
        clinical trials, or (ii) PRODUCTS used by PMC, its Affiliates or 
        Sublicensees, for research, (iii) customary quantities of PRODUCTS 
        distributed as free samples or (iv) reasonable quantities of 
        PRODUCTS disposed by PMC as donations to Third-Parties (such as 
        humanitarian and charitable organizations).

4.4.	Royalties for Sale of Bulk Products.
        ------------------------------------

	In those cases where PMC, its Subsidiaries or Sublicensees sell 
        PRODUCTS in bulk to a Third-Party, the royalty due to CISTRON 
        hereunder shall be calculated on the Net Sales of bulk PRODUCTS to 
        said Third-Party.
        
4.5.	Compulsory Licenses.
        --------------------

	If a compulsory license is granted with respect to a PRODUCT in any 
        country in the Territory with a royalty rate lower than the royalty 
        rates provided within this Article 4, then the rate of the royalty 
        to be paid on Net Sales in that country under Article 4 shall be 
        reduced to the rate paid by the compulsory licensee.


4.6.	Milestone Payments.
        -------------------
	As additional consideration for the LICENSE, rights and privileges 
        granted to it hereunder, PMC shall pay to CISTRON the following 
        milestone payments within thirty (30) days of the occurrence of each 
        event set forth below, whether such events are achieved by PMC, its 
        Affiliates or Sublicensees :

        [OPTIONAL : will depend on how Option is exercised.



- ---------------------------------------------------------------------------
Confidential treatment has been requested for portions of this page of this 
exhibit.  The copy filed herewith omits the information subject to the 
confidentiality request.  Omissions are designated as ["xxxxx"].  The 
portions omitted have been filed separately with the Securities and 
Exchange Commission pursuant to such request for confidential information.
- ---------------------------------------------------------------------------

                                    -32-
<PAGE>33

        a)      Upon commencement of the first Phase III clinical trial with
                respect to each of the first  (1st) and second (2nd) PRODUCT 
                belonging to the Field of Preventative Vaccines (provided such
                field is included in the Selected Field of Use), ["xxxxx"] for
                each;

        (b)     Upon receipt of the product registration in [either] the United
                States of America [or the European Union] with respect to each
                of the first (1st) and the second (2nd) PRODUCT belonging to
                the Field of Preventative Vaccines, ["xxxxx"] for each ;

        (c)     Upon commencement of the first Phase III clinical trial with 
                respect to each the first (1st) and the second (2nd) PRODUCT 
                belonging to the Field of Therapeutic Vaccines (provided such 
                field is included in the Selected Field of Use), ["xxxxx"] for
                each ;

        (d)     Upon receipt of the product registration in [either] the United
                States of America [or European Union] with respect to each of
                the first (1st) and the second (2nd) PRODUCT belonging to the
                Field Therapeutic Vaccines, ["xxxxx"] for each.]


ARTICLE 5 - ROYALTY REPORTS AND ACCOUNTING.
- -------------------------------------------

5.1.	Reports, Exchange Rates.
        ------------------------

	During the term of this Agreement following the First Commercial 
        Sale, PMC shall furnish to CISTRON, with respect to each Calendar 
        Quarter, a written report showing in reasonably specific detail, on 
        a country-by-country basis, (a) the gross sales of PRODUCTS sold by 
        PMC, its Affiliates and its Sublicensees in the Territory during the 
        corresponding Calendar Quarter and the calculation of Net Sales from 
        such gross sales ; (b) the royalties payable in United States 
        dollars, if any, which shall have accrued hereunder based upon Net 
        Sales of PRODUCTS ; (c) the withholding taxes, if any, required by 
        law to be deducted in respect of such royalties ; (d) the date of 
        the First Commercial Sale of PRODUCTS having occurred in each 
        country in the Territory during the corresponding Calendar Quarter  
        and (e) the exchange rates used in determining the royalty amount 
        expressed in United States dollars.

	With respect to sales (if any) of PRODUCTS invoiced in United States 
        dollars, the gross sales, Net Sales, and royalties payable shall be 
        expressed in United Sates dollars. With respect to sales of PRODUCTS 
        invoiced in a currency other than United Sates dollars, the gross 
        sales, Net Sales and royalties payable shall be expressed in the 
        currency of the invoice issued by the Party making the sale together 
        with the United States dollars equivalent of the royalty payable, 
        calculated using the rate of exchange published in the Wall Street 
        Journal for such currency on the last business day of the concerned 
        Calendar Quarter. Reports and payments shall be due on the forty 
        fifth (45th) day following the close of each Calendar Quarter. PMC 
        shall keep complete and accurate records in sufficient detail to 
        properly reflect all gross sales and Net Sales and to enable the 
        royalties payable hereunder to be determined.

5.2.	Audits.
        -------

5.2.1.	Upon the written request of CISTRON and not more than once in each 
        calendar year, PMC shall permit an independent certified public 
        accounting firm of internationally recognized standing, selected by 
        CISTRON and reasonably acceptable to PMC, at CISTRON's 



- ---------------------------------------------------------------------------
Confidential treatment has been requested for portions of this page of this 
exhibit.  The copy filed herewith omits the information subject to the 
confidentiality request.  Omissions are designated as ["xxxxx"].  The 
portions omitted have been filed separately with the Securities and 
Exchange Commission pursuant to such request for confidential information.
- ---------------------------------------------------------------------------

                                   -33-
<PAGE>34

        expense, to have access during normal business hours to such of the
        records of PMC as may be reasonably necessary to verify the accuracy 
        of the royalty reports hereunder for any year ending not more than 
        three (3) years prior to the date of such request. The accounting 
        firm shall disclose to CISTRON only whether the records are correct 
        or not and the specific details concerning any discrepancies. No 
        other information shall be shared.


5.2.2.	If such accounting firm concludes that additional royalties were 
        owed during such period, PMC shall pay the additional royalties 
        within thirty (30) days of the date CISTRON delivers to PMC such 
        accounting firm's written report so concluding. The fees charged by 
        such accounting firm shall be paid by CISTRON ; provided, however, 
        if the audit discloses that the royalties payable by PMC for the 
        audited period are more than one hundred and twenty percent (120%) 
        of the royalties actually paid for such period, then PMC shall pay 
        the reasonable fees and expenses charged by such accounting firm.

5.2.3.	PMC shall include in each permitted sublicense granted by it 
        pursuant to the Agreement a provision requiring the SUBLICENSEE to 
        make reports to PMC, to keep and maintain records of sales made 
        pursuant to such sublicense and to grant access to such records by 
        CISTRON's independent accountant to the same extent required with 
        respect to PMC's records under this Agreement.

5.2.4.	Except in the case of circumstances which would have prevented an 
        error or anomaly from being disclosed during the audit hereabove 
        mentioned, such as fraud or other failure to provide accurate 
        information, upon the expiration of three (3) years following the 
        end of any calendar year, the calculation of royalties payable with 
        respect to such year shall be binding and conclusive upon CISTRON, 
        and PMC, its Affiliates and Sublicensees shall be released from any 
        liability or accountability with respect to royalties for such year.

5.3.	Confidential Financial Information.
        -----------------------------------

        CISTRON shall treat all financial information subject to review
        under this Article 6 or under any sublicense agreement as 
        confidential, and shall cause its accounting firm to retain all such 
        financial information in confidence.



ARTICLE 6 - PAYMENTS.
- ---------------------

6.1.	Payment Term.
        -------------

	Royalties shown to have accrued by each royalty report provided for
        under Article 5 of this Agreement shall be due on the date such 
        royalty report is due. Payment of royalties in whole or in part may 
        be made in advance of such due date.


6.2.	Payment Method.
        ---------------

	All payments by PMC to CISTRON under this Agreement shall be paid in
        United States dollars, and all such payments shall be made without 
        deduction of bank transfer fees by bank wire transfer in immediately 
        available funds to the following bank account :

        Account No.     6101198381
        Bank :          Bank of New York, 399 Ridgedale Ave.,
                        E. Hanover, N.J. 07936-1488
        Code :          021202719
        Addressee :     Cistron Biotechnology, Inc.


	or to any other bank account designated in writing from time to 
        time, to PMC, by CISTRON.

                              -34-
<PAGE>35

6.3.	Withholding Taxes.
        ------------------

	Royalties and milestone payments shall be paid by PMC to CISTRON, 
        after deduction of any applicable withholding taxes. Prior to any 
        payment by PMC to CISTRON, PMC shall provide to CISTRON any forms 
        required to attest CISTRON's fiscal domiciliation in order to allow 
        PMC to claim application of the reduced rate of withholding tax 
        provided for in any applicable bilateral fiscal convention. CISTRON 
        shall promptly return such forms to PMC. In the event CISTRON fails 
        to promptly return such forms duly filled and signed, PMC shall 
        declare and pay withholding tax at the common law rate of the 
        applicable corporate income tax, and such tax shall then be deducted 
        from the corresponding payment by PMC to CISTRON. PMC shall pay 
        withholding tax to the proper taxing authority and proof of payment 
        of such tax shall be secured and sent to CISTRON as evidence of such 
        payment. If, in the opinion of either Party, the provisions of this 
        section become extremely burdensome, the Parties agree to meet and 
        discuss such other options as may be available to them.
        
	In order to properly document the tax file, CISTRON shall file or 
        have filed, and sign or have signed, the tax form herewith attached 
        as Exhibit 1 prior to each milestones or royalty payment owing from 
        PMC to CISTRON hereunder.
 


ARTICLE 7 - INVENTIONS AND PATENTS.
- -----------------------------------

7.1.	Ownership and Commercialization of Inventions.
        ----------------------------------------------

	Ownership of Inventions : All rights, title and interest in and to 
        any technology or invention, whether or not patentable, and any 
        patent applications and patents based thereon, made or conceived (i) 
        by employees or others acting solely on behalf of CISTRON or its 
        Affiliates, including but not limited to CISTRON Improvements, shall 
        be owned solely by CISTRON or its Affiliates ; (ii) by employees or 
        others acting solely on behalf of PMC or its Affiliates, including 
        but not limited to PMC Improvements, shall be owned solely by PMC or 
        its Affiliates and (iii) by both employees or others acting on 
        behalf of CISTRON or its Affiliates and on behalf of PMC or its 
        Affiliates, shall be jointly owned by CISTRON and PMC (the "Joint 
        Inventions").

        CISTRON and PMC each hereby represents that all employees and other 
        Persons acting on its behalf in performing its obligations under 
        this Agreement shall be obligated under a binding written agreement 
        to assign to it, or as it shall direct, all Improvements conceived 
        or reduced to practice by such employees or other Persons during the 
        term of this Agreement.

        Commercialization of Joint Inventions :  During the term of this 
        Agreement PMC shall have the exclusive right to commercialize Joint 
        Inventions in the Field of Use and shall pay royalties to CISTRON in 
        accordance with this Agreement in consideration for such right. In 
        the event that CISTRON wishes to commercialize any Joint Invention 
        outside the Field of Use, CISTRON agrees to pay a royalty. 

        The Parties agree to negotiate in good faith such royalty so that it 
        reflects the value of the Joint Invention in relation to all other 
        technology and proprietary rights included in the product and/or 
        process embodying such Joint Invention.
        
                                   -35-
<PAGE>36

7.2.    Patent Prosecution and Maintenance.
        -----------------------------------

	Licensed Patents. CISTRON shall be responsible for and shall control 
        the preparation, filing, prosecution, grant and maintenance of all 
        LICENSED PATENTS. CISTRON shall prepare, file, prosecute and 
        maintain such LICENSED PATENTS in good faith consistent with its 
        customary patent policy and its reasonable business judgement, and 
        shall consider in good faith the interests of PMC in so doing.

	Joint Inventions. As to any Joint Inventions, CISTRON shall have the 
        first right to file patent applications with respect to such 
        inventions in the name of both Parties. CISTRON may elect not to 
        file and if it does so, PMC shall have the right to file the patent 
        applications in the name of both Parties. In each case, the filing 
        Party shall give the non-filing Party an opportunity to review the 
        text of the applications before filing, shall consult with the non-
        filing Party with respect thereto and shall supply the non-filing 
        Party with a copy of all applications as filed, together with notice 
        of their filing dates and serial numbers and fifty percent (50%) of 
        the out-of-pocket costs and expenses of the filing Party shall be 
        reimbursed by the other Party. Both Parties shall keep the other 
        advised of the status of actual and prospective patent application 
        filings and upon request, provide advanced copies of any documents 
        related to such filings and thereafter to the prosecution and 
        maintenance of all patent applications and patents.

	Costs. With respect to all filings hereunder, the filing Party shall 
        be responsible for payment of all costs and expenses related to such 
        filings, prosecution and maintenance, unless relieved of same 
        pursuant to Section 7.3 hereinafter, and except for jointly owned 
        patents, for which fifty percent (50%) of all such costs and 
        expenses shall be reimbursed to the filing Party by the other Party.


7.3.	Option to Prosecute and Maintain Patents.
        -----------------------------------------

	CISTRON shall give notice to PMC of any intention to cease 
        prosecution and/or maintenance, or not to proceed with an extension, 
        of LICENSED PATENTS and, in such case, shall permit PMC, at PMC's 
        sole discretion, to continue prosecution or maintenance or proceed 
        with the extension at its own expenses. If PMC elects to continue 
        prosecution or maintenance or to proceed with the extension, CISTRON 
        shall execute such documents and perform such acts at PMC's expense 
        as may be reasonably necessary to effect an assignment of such 
        LICENSED PATENTS to PMC in a timely manner, and more generally to 
        permit PMC to continue such prosecution and maintenance or to 
        proceed with the extension. Any patents and patent applications so 
        assigned shall not be considered as LICENSED PATENTS as of the date 
        of such assignment. No royalties shall be payable by PMC on sales of 
        PRODUCTS covered only by a Valid Patent Claim of a LICENSED PATENT 
        which has been assigned to PMC pursuant to this Section 7.3.


7.4.	Interference, Opposition, Reexamination and Reissue.
        ----------------------------------------------------
        (i)   The Parties shall use their respective best efforts to within
              ten (10) days of learning of any interference, opposition, 
              reexamination or reissue event, inform the other Party of any 
              request for, or filing or declaration thereof relating to 
              LICENSED PATENTS.  The Parties shall thereafter consult and 
              cooperate fully to determine the course of action with respect
              to any such proceeding. Both Parties shall have the right to
              review and comment on any submission to be made in connection
              with any such proceeding.

        (ii)  CISTRON shall not institute any reexamination or reissue 
              proceeding relating to LICENSED PATENTS without having first 
              consulted PMC.
                                   -36-
<PAGE>37

        (iii) In connection with any interference, opposition, reissue 
              or reexamination proceeding relating to LICENSED PATENTS, the 
              Parties shall cooperate fully and shall provide each other with 
              any information or assistance that either Party may reasonably 
              request. CISTRON shall keep PMC informed of developments in any 
              such action or proceeding, including, to the extent permissible, 
              the status of any settlement negotiations and the terms of any 
              offer related thereto.

        (iv)  CISTRON shall bear the expense of any interference, opposition, 
              reexamination or reissue proceeding relating to LICENSED PATENTS.


7.5.	Enforcement and Defense. 
        ------------------------

        (i)   Each Party shall give the other notice of either (a) any 
              infringement of LICENSED PATENTS, or (b) any misappropriation or
              misuse of LICENSED KNOW-HOW that has come to its attention. The 
              Parties shall thereafter consult and cooperate fully to determine
              a course of action, including but not limited to the commencement
              of legal action by either or both Parties to terminate any 
              infringement of LICENSED PATENTS or any misappropriation or 
              misuse of LICENSED KNOW-HOW.

        (ii)  In the event that LICENSED PATENTS are infringed by any Third-
              Party with respect to a PRODUCT in the Field of Use, CISTRON, 
              upon notice to PMC, shall have the first right, but not the 
              obligation, to institute and prosecute any action or proceeding 
              under LICENSED PATENTS with respect to such infringement, by 
              counsel of its choice, or to control the defense of any 
              declaratory judgment action arising from such infringement or 
              from the misappropriation or misuse of LICENSED KNOW-HOW, at its
              own expense and in the name of both Parties. CISTRON shall not 
              settle, compromise or take any action in such litigation which 
              diminish, limit or inhibit the scope, validity or enforceability
              of LICENSED PATENTS without the express permission of PMC. 
              CISTRON shall keep PMC advised of the progress of such 
              proceedings.

        (iii) In the event that a Third-Party is infringing any LICENSED
              PATENTS with respect to a PRODUCT in the Field of Use
              and CISTRON does not elect to institute an action, PMC, upon 
              notice to CISTRON, shall have the right, but not the obligation,
              to institute and prosecute any action or proceeding under 
              LICENSED PATENTS with respect to such infringement, by counsel of
              its choice, or to control the defense of any declaratory judgment
              action arising from such infringement or from the 
              misappropriat on or misuse of LICENSED KNOW-HOW, at its own 
              expense and in the name of both Parties. PMC shall not settle, 
              compromise or take any action in such litigation which diminish,
              limit or inhibit the scope, validity or enforceability of 
              LICENSED PATENTS without the prior approval of CISTRON, which 
              shall not be unreasonably withheld.

        (iv)  With respect to any action to terminate any infringement of 
              LICENSED PATENTS or any misappropriation or misuse of LICENSED 
              KNOW-HOW, the Parties shall cooperate fully and shall provide 
              each other with any information and assistance that either Party
              may reasonably request. In particular, either Party shall execute
              such documents necessary for the other Party to initiate and 
              prosecute the action or proceeding and cause its Affiliates and 
              Sublicensees to execute all such documents, if required. In the 
              event that either Party is unable to initiate or prosecute an 
              action solely in its own name, the other Party shall then join 
              such action voluntarily. Each Party shall keep the other informed 
              of the development of any action or proceeding including, to the
              extent permissible by law, the status of any settlement 
              negotiations and the terms of any offer related thereto.

        (v)   Any recovery obtained by either or both Parties in connection 
              with or as a result of any action or proceeding contemplated by 
              this Section 7.5, whether by settlement or otherwise, shall be 
              allocated in order as follows :

              (a)  The Party which initiated and prosecuted the action shall 
                   recoup all of its costs and expenses incurred in connection
                   with the action (provided that if PMC was the

                                   -37-
<PAGE>38

                   initiating Party and that the action proceeds were not
                   sufficient for PMC to recoup all its costs and expenses,
                   then PMC shall be allowed to deduct the balance of its
                   unrecovered costs and expenses from royalties payable to
                   CISTRON under Article 4 hereof) ;

              (b)  The other Party shall then, to the extent possible, recover
                   its costs and expenses incurred in connection with the
                   action; and

              (c)  The amounts of any recovery remaining shall then be
                   allocated between the Parties with PMC receiving all amounts
                   in respect of damages in the Field of Use and CISTRON
                   receiving all amounts in respect of damages out of the Field
                   of Use, except that any amounts recovered in connection with
                   infringement actions relating to jointly-owned patents shall
                   be equally shared between the Parties.

        (vi)  CISTRON shall inform PMC of any certification regarding any 
              LICENSED PATENTS it has received pursuant to 21 United States 
              Code 355(b)(2)(A)(iv) or (j)(2)(A)(vii)(IV), or any similar 
              provision in other countries, and shall provide PMC with a copy 
              of such certification within five (5) days of receipt. Both 
              Parties rights with respect to the initiation and prosecution of 
              any legal action as a result of such certification or any 
              recovery obtained as a result of such legal action shall be as 
              defined in paragraphs (a) to (c) of this Section 7.5.
        

7.6.	Notice of Patent Events.
        ------------------------

	CISTRON shall promptly give notice to the other Party of the grant, 
        lapse, revocation, surrender or invalidation of any LICENSED 
        PATENTS.

        
7.7.	Patent Term Restoration.
        ------------------------

	CISTRON shall notify PMC of (a) the issuance of each U.S. patent 
        included within the LICENSED PATENTS, giving the date of issue and 
        patent number for each such patent, and (b) each notice pertaining 
        to any patent included within the LICENSED PATENTS which it receives 
        as patent owner pursuant to the United Sates Drug Price Competition 
        and Patent Term Restoration Act of 1984 (hereinafter called the 
        "Act"), including notices pursuant to 101 and 103 of the Act
        from Persons who have filed a biological license application ("BLA")
        or an abbreviated new drug application ("ANDA"), whichever is
        applicable. Such notices shall be given promptly, but in any event
        within five (5) calendar days of each such patent's date of issue or
        receipt of each such notice pursuant to the Act, whichever is
        applicable. CISTRON shall notify PMC of each filing for patent term
        restoration under the Act, any allegations of failure to show due
        diligence and all awards of patent term restoration (extensions) with
        respect to the LICENSED PATENTS.

	Likewise, CISTRON or PMC, as the case may be, shall inform the other 
        Party of patent extensions and periods of data exclusivity in the 
        rest of the world regarding any PRODUCTS and more generally the 
        Parties shall diligently cooperate with respect to any procedures 
        for patent and period of data exclusivity extensions, such as but 
        not limited to Supplementary Protection Certificates, the above-
        mentioned Patent Term Restoration and corresponding GATT 
        regulations.

                                  -38-
<PAGE>39

ARTICLE 8 - GENERAL PROVISIONS
- ------------------------------

8.1.	Confidentiality
        ---------------

	(a) -	General
                -------
                Except as expressly set forth in this section 8, each Party
                shall cause its respective affiliates, officers, directors,
                employees, agents and subcontractors (collectively,
                "Representatives") to keep confidential any and all technical,
                commercial, scientific and other data, processes, documents or
                other information (whether in oral or written form) or
                physical object (including, without limitation, Biological
                Materials, intellectual property, marketing data, agreements
                between any Party and a Third-Party, license applications, and
                business plans and projections of any Party) acquired from the
                other Party (the "Other Party"), its affiliates or its
                Representatives prior to or after the date of this Agreement
                and which relates (in the case of a Party) to the Other Party
                or any of its Affiliates or their respective businesses
                ("Confidential Information"), and each Party shall not disclose
                directly or indirectly, and shall cause its Representatives not
                to disclose directly or indirectly, any Confidential
                Information to anyone outside such Person, such affiliates and
                their respective Representatives, except that the foregoing
                restriction shall not apply to any information disclosed
                hereunder to any Party, if such Person (the "Receiving Person")
                can demonstrate that such Confidential Information : 

                (i)   is or hereafter becomes generally available to the trade
                      or public other than by reason of any breach or default
                      by the Receiving Person, any of its affiliates or any
                      Representative of the foregoing with respect to a
                      confidentiality obligation under this Agreement ;

                (ii)  was already known to the Receiving Person or such
                      affiliate or Representative ;

                (iii) is disclosed to the Receiving Person or such affiliate
                      or Representative by a Third-Party who has the right
                      to disclose such information ;

                (iv)  based on such Person's good faith judgement with the
                      advice of counsel, is otherwise required to be disclosed
                      in compliance with applicable legal requirements to a
                      public authority such as, without limitations, the U.S.
                      Food & Drug Administration (FDA), the European Medicines
                      Evaluation Agency (EMEA), the French Agence du Medicament
                      or any comparable authority of any country having
                      jurisdiction.

                Whenever the Receiving Person becomes aware of any state of
                facts which would or might result in disclosure of Confidential
                Information pursuant to subparagraph (iv) above with the
                exception of the case here below referred to in Section 4.1.(g)
                in fine, it shall, if possible, promptly notify the Person
                making disclosure (the "Disclosing Person") prior to any such
                disclosure so that the Disclosing Person may seek a protective
                order or other appropriate remedy and/or waive compliance with
                the provisions of this Agreement.

                In any event, if the Receiving Person is unable to promptly
                notify the Disclosing Person or if such protective order or
                other remedy is not obtained, or if the Disclosing Person
                waives compliance with the provisions of this Agreement, the
                Receiving Person will furnish only that portion of the
                information which it is advised by counsel is legally required
                and will exercise reasonable efforts to obtain assurance that
                confidential treatment will be accorded the Confidential
                Information.

                Each Party shall be entitled, in addition to any other right
                or remedy it may have, at law or in equity, to an injunction,
                without the posting of any bond or other security except as
                required by the relevant laws, enjoining or restraining any
                other Party from any violation or threatened violation of
                this Section 8.
                                   -39-
<PAGE>40

	(b) -	Use of Confidential Information
                -------------------------------

                Each Party agrees that no Confidential Information shall :

                (i)   be used in its own business except as necessary to the 
                      fulfilment of the rights and obligations of such Party
                      under this Agreement ;

                (ii)  be assigned, licensed, sublicensed, marketed,
                      transferred or loaned, directly or indirectly to any
                      third Party other than a Representative or an Affiliate
                      Representative of such Party, except as necessary to the
                      fulfilment of the rights and obligations of the parties
                      under this Agreement ;

                (iii) be used or exploited by such Party or any of its 
                      Affiliates or their Representatives for its or their 
                      respective benefit or the benefit of any other
                      relationships with customers of such Party and its
                      affiliates.

                Without limiting the generality of the foregoing, each Party 
                agrees that, it shall not (and shall not permit any of its 
                Affiliates) at any time use any Confidential Information in the
                conduct of its business without the prior written consent of
                the Other Party. 

                The obligations set forth in this Section 8.1. shall extend to
                copies, if any, of Confidential Information made by any 
                Representatives referred to in paragraph (a) and to documents 
                prepared by such Persons which embody or contain Confidential 
                Information.

	(c) -	Protection of Confidential Information
                --------------------------------------

		Each Party shall deal with Confidential Information so as to 
                protect it from disclosure with a degree of care not less than 
                that used by it in dealing with its own information intended to
                remain exclusively within its knowledge and shall take
                reasonable steps to minimize the risk of disclosure of
                Confidential Information which shall include, without
                limitation, ensuring that only its affiliates and its and their
                Representatives who have a bona fide "need to know" such
                Confidential Information for purposes permitted or contemplated
                by this Agreement shall have access thereto. 

		Each Party, shall notify all of its Representatives who have 
                access to Confidential Information of its confidentiality and
                the care therefor required, and shall obtain from any Affiliate
                or any agent or subcontractor who is a Representative that is
                permitted access to such Confidential Information in accordance
                with this Section 8.1., an agreement of confidentiality
                incorporating the restrictions set forth herein.

	(d) -	Survival of Obligations
                -----------------------

		The obligations set forth in this Section 8.1. shall survive
                the termination of this Agreement for a period of five (5)
                years.

	(e) -	Return of Confidential Information
                ----------------------------------

                Within thirty (30) days after the termination of this
                Agreement, the Receiving Person shall (and shall cause its
                Affiliates' Representatives and its Affiliates to) return to
                the Disclosing Person or destroy all related documents and
                tangible items (included but not limited to unused Biological
                Materials) then in its possession which it has received from
                the Disclosing Person or any affiliate or Representative
                thereof pertaining, referring or relating to the Disclosing
                Person's Confidential Information, as well as all copies,
                summaries, records, descriptions, modifications, and
                duplications that it, or any of its affiliates
                or Representatives, has made from the documents or tangible
                items received from the Disclosing Person or any affiliate or
                Representative thereof; provided, however, that the Receiving 
                Person may retain one copy of each document in its legal files
                solely to permit the Receiving Person to continue to comply
                with its obligations hereunder and, in addition, may upon
                notice to the Disclosing Person, retain in its legal files or
                in the
                                   -40-
<PAGE>41

                office of outside legal counsel one copy of any document
                solely for use in any pending legal proceeding to which such
                document relates.

	(f) -	Publications
                ------------

		Each Party shall have the right to publish or present the
                results of the Research Program or of any research related to
                the Field of Use and announce scientific progress of the
                Research Program, provided such publication, presentation or
                announcement (and any revisions thereof, a "Publication") is
                submitted to the other Party at least ninety (90) days prior
                to submitting it to any Third-Party (including any editing
                Person). The other Party shall have ninety (90) days after
                receipt of the draft Publication to review and comment on such
                draft. Upon notice within such ninety (90) day period by the
                other Party that such Party reasonably believes the
                Publication would amount to the public disclosure of
                a patentable invention (including but not limited to a Joint 
                Invention) upon which a patent application should be filed
                prior to any such disclosure, submission of the concerned
                Publication to Third-Parties shall be delayed for a ninety (90)
                day period from the date of said notice, or for such longer
                period which may appear necessary for appropriately drafting
                and filing a patent application covering such invention. In
                addition, each Party shall take into account comments made by
                the other Party on any Publication and shall accept to have
                employees or others acting on behalf of the other Party be
                mentioned as co-authors on any Publication describing results
                to which such Persons shall have contributed. The Parties
                acknowledge the provisions relating to publications as set
                forth in the Research Agreement between CISTRON and Duke
                University dated September 1, 1998, and agree that such
                provisions shall prevail and control any publication
                proposed under such Research Agreement.


        (g)     Press Releases and other Disclosures to Third-Parties.

                Neither CISTRON nor PMC shall, without the prior written
                consent of the other, issue any press release or make any
                other public announcement or furnish any statement to any
                Person (other than either Party's respective Affiliates)
                concerning the existence of this Agreement and the
                transactions contemplated by this Agreement, except for
                (i) general statements referring to the existence of this
                Agreement, specifying its nature (Research Collaboration and
                License Option), the Field of Use and identity of the Parties
                but no other details, (ii) disclosures made in compliance with
                Section 4.1.(a) hereof, (iii) attorneys, consultants, and
                accountants retained to represent them in connection with the
                transactions contemplated hereby or as may be reasonably
                necessary to either Party's bankers, investors, attorneys or
                other professional advisers in connection with a merger or
                acquisition, provided such advisors are bound by
                confidentiality obligations essentially identical to those
                provided for herein, and (iv) occasional, brief comments by
                the respective executive officers of both Parties consistent
                with such guidelines for public statements as may be mutually
                agreed by the Parties made in connection with routine
                interviews with analysts or members of the financial press.
                In addition, either Party (after consultation with counsel) in
                its own right may make such further announcements and
                disclosures, if any, as may be required by applicable security
                laws and regulations (such as, without limitation, regulations
                of the US Securities & Exchange Commission (SEC) or the French
                Commission des Operations de Bourse (COB), or any equivalent
                authority of any country having jurisdiction), in which case
                the Party making the announcement or disclosure shall use its
                best efforts to give advance notice to, and discuss such
                announcement or disclosure with, the other Party and such other
                Party's attorneys.
                                       
                                   -41-
<PAGE>42

8.2.	Term and termination.
        ---------------------

8.2.1.	Expiration.
        -----------

	Unless terminated earlier pursuant to this Section 8.2. or Section 
        8.4. hereof, the Agreement shall expire on the expiration of PMC's 
        obligations to pay royalties under the Agreement in accordance with 
        the Royalty Term. Thereafter, PMC and its permitted Sublicensees (if 
        any) shall have a perpetual, fully paid-up, royalty-free, non-
        cancellable, worldwide license or sub-license (whichever is 
        applicable) to the CISTRON Technology.


8.2.2.	Termination by PMC.
        -------------------

	PMC shall have the right at any time, in its sole discretion, to 
        terminate this Agreement, by giving not less than three (3) months' 
        prior written notice to CISTRON of such termination.


8.2.3.	Termination for Cause.
        ----------------------

        (i)   Either Party may terminate this Agreement, at its option, upon 
              or after the breach of any material provision of the Agreement 
              by the other Party, if such breaching Party has not cured such 
              breach within ninety (90) days after written notice thereof 
              from the other Party.

        (ii)  PMC or CISTRON may terminate this Agreement upon written 
              notice to the other Party if the other Party makes a general 
              assignment for the benefit of creditors, is the subject of 
              proceedings in voluntary or involuntary bankruptcy or has a 
              receiver or trustee appointed for substantially all of its 
              property ; provided that in the case of an involuntary 
              bankruptcy proceeding such right to terminate shall only 
              become effective if the other Party consents thereto or such 
              proceeding is not dismissed within ninety (90) days after the 
              filing thereof.

        (iii) Each of the parties hereto acknowledges and agrees that this 
              Agreement (i) constitutes a license of Intellectual Property 
              (as such term is defined in the United States Bankruptcy Code, 
              as amended (the "Code"), and (ii) is an executory contract, 
              with significant obligations to be performed by each Party 
              hereto. The parties agree that PMC as LICENSEE may fully 
              exercise all of its rights and elections under the Code, 
              including, without limitation, those set forth in Section 365 
              (n) of the Code. The parties further agree that, in the event 
              that PMC elects to retain its rights as a licensee under the 
              Code, PMC shall be entitled to complete access to the CISTRON 
              Technology licensed to it hereunder and all embodiments of 
              such technology. Such embodiments of the CISTRON Technology 
              shall be delivered to PMC not later than (a) the commencement 
              of bankruptcy proceedings against CISTRON, unless CISTRON 
              elects to perform its obligations under the Agreement, or (b) 
              if not delivered under (a) above, upon the rejection of the 
              Agreement by or on behalf of CISTRON.


8.2.4.	Effect of Expiration and Termination.
        -------------------------------------

        Expiration or termination of the Agreement shall not relieve the
        Parties of any obligation accruing prior to such expiration or 
        termination. The provisions of Sections [TO BE COMPLETED] and 
        Articles [TO BE COMPLETED] shall survive the expiration or 
        termination of the Agreement. 

        Upon termination of this Agreement pursuant to Sections 8.2.2 or 
        8.2.3, and in the latter case, provided it is terminated as a 
        result of a  breach of a material obligation of PMC hereunder, all 
        rights granted to PMC hereunder shall revert to CISTRON, PMC shall 
        return the entire CISTRON Technology and all embodiments of such 
        technology to CISTRON and shall cease any use of it forthwith.  
        CISTRON shall have a right of first refusal on PMC's

                                  -42-
<PAGE>43

        intellectual property rights pertaining to any PRODUCT that was
        developed by PMC at the date of termination (including PMC rights on
        Joint Inventions), and CISTRON and PMC shall negotiate in good faith
        the Terms and conditions of a license from PMC to CISTRON on such
        PMC's rights relating to such PRODUCT(S) provided, however, that such
        rights shall not include any intellectual property relating solely 
        to antigens or to any compound other than the FACTOR and provided, 
        further, that PMC shall be under no obligation neither to provide 
        any technical assistance nor to supply any product or Biological 
        Material. In the event that after termination and reversal of rights 
        and/or license to CISTRON hereunder, CISTRON either alone or in 
        collaboration with any Third-Party or through licenses and sub-
        licenses eventually commercialize a PRODUCT, CISTRON shall pay to 
        PMC an amount equal to one half (50%) of any compensation received, 
        either in kind or in cash, by CISTRON with respect to or in 
        connection with such PRODUCT(S).

	Upon termination of this Agreement pursuant to Section 8.2.3 further 
        to a breach of a material obligation of CISTRON hereunder, the 
        LICENSE shall be deemed terminated and replaced by a perpetual, 
        fully paid-up, royalty-free, non-cancelable, exclusive and worldwide 
        license to the CISTRON Technology to PMC, with the right to grant or 
        maintain sub-licenses. 
        

8.3.	Indemnity.
        ----------

8.3.1.	Direct Indemnity.
        -----------------

8.3.1.1. Each Party shall indemnify and hold harmless the other Party, 
        its Affiliates, and their respective directors, officers, 
        shareholders, agents, consultants and employees from and against all 
        Third-Party claims, demands, liabilities, damages (including damages 
        directly or indirectly suffered by the other Party and/or its 
        Affiliates and their respective directors, officers, shareholders, 
        agents, consultants and employees) and expenses, including 
        attorneys' fees and costs (collectively, the "Liabilities") arising 
        out of the breach of any material provision of this Agreement by the 
        indemnifying Party or caused by an intentional act or omission of 
        the indemnifying Party.


8.3.1.2. PMC shall defend, indemnify and hold harmless CISTRON, its 
        Affiliates, and their respective directors, officers, shareholders, 
        agents, consultants and employees, from and against all Liabilities 
        suffered or incurred arising out of any Third-Party claims in 
        connection with the manufacture, design, testing, possession, 
        distribution, use, sale or other disposition by or through PMC, its 
        Affiliates or Sublicensees of any PRODUCTS, except in each case to 
        the extent such Liabilities resulted from the gross negligence, 
        recklessness or intentional acts or omissions by CISTRON.
        

8.3.2.	Procedure.
        ----------
	A Party (the "Indemnitee") that intends to claim indemnification 
        under this Article 8.3. shall promptly notify the other Party (the 
        "Indemnitor") of any Liability or action in respect of which the 
        Indemnitee intends to claim such indemnification, and the Indemnitor 
        shall have the right to participate in, and, to the extent the 
        Indemnitor so desires, jointly with any other Indemnitor similarly 
        noticed, to assume the defense thereof with counsel selected by the 
        Indemnitor ; provided, however, that the Indemnitee shall have the 
        right to retain its own counsel, with the fees and expenses to be 
        paid by the Indemnitor, if representation of such Indemnitee by the 
        counsel retained by the Indemnitor would be inappropriate due to 
        actual or potential differing interests between such Indemnitee and 
        any other Party represented by such counsel in such proceedings. 

                                   -43-
<PAGE>44

	The indemnity obligations under this Article 8.3. shall not apply to 
        amounts paid in settlement of any loss, claim, damage, liability or 
        action if such settlement is effected without the consent of the 
        Indemnitor, which consent shall not be withheld unreasonably. The 
        failure to deliver notice to the Indemnitor within a reasonable time 
        after the commencement of any such action, if prejudicial to its 
        ability to defend such action, shall relieve such Indemnitor of any 
        liability to the Indemnitee under this Article 8.3. The Indemnitee, 
        its Affiliates, employees and agents, shall cooperate fully with the 
        Indemnitor and its legal representatives in the investigation of any 
        action, claim or liability covered by this indemnification.


8.4.	Force Majeure.
        --------------
        No Party (or any of its Affiliates) shall be held liable or 
        responsible to the other Party (or any of its Affiliates) nor be 
        deemed to have defaulted under or breached the Agreement for failure 
        or delay in fulfilling or performing any term of the Agreement when 
        such failure or delay is caused by or results from causes beyond the 
        reasonable control of the affected Party (or any of its Affiliates) 
        including but not limited to fire, floods, embargoes, war, acts of 
        war (whether war be declared or not), insurrections, riots, civil 
        commotions, strikes, lockouts or other labor disturbances, acts of 
        God or acts, omissions or delays in acting by any governmental 
        authority or the other Party (collectively, "Events of Force 
        Majeure") ; 

        provided, however, that the affected Party (i) shall immediately 
        notify the other Party of the occurrence of any such Event of Force 
        Majeure and (ii) shall exert all reasonable efforts to eliminate, 
        cure or overcome any such Event of Force Majeure and to resume 
        performance of its covenants with all possible speed ; and provided, 
        further, that nothing contained herein shall require any Party to 
        settle on terms unsatisfactory to such Party any strike, lockout or 
        other labor difficulty, any investigation or proceeding by any 
        governmental authority or any litigation by any Third-Party. 
        Notwithstanding the foregoing, to the extent that an Event of Force 
        Majeure continues for a period in excess of six (6) months, the 
        affected Party shall promptly notify in writing the other Party of 
        such Event of Force Majeure and within four (4) months of the other 
        Party's receipt of such notice, the Parties agree to negotiate in 
        good faith either (i) to resolve the Event of Force Majeure, if 
        possible, (ii) to extend by mutual agreement the time period to 
        resolve, eliminate, cure or overcome such Event of Force Majeure, 
        (iii) to amend this Agreement to the extent reasonably possible, or 
        (iv) to terminate this Agreement.


8.5.	Assignment.
        -----------

        This Agreement in its entirety may not be assigned or otherwise 
        transferred, nor, except as expressly provided hereunder, may any 
        right or obligations pertaining to the Field of Use hereunder be 
        assigned or transferred to any Third-Party by either Party without 
        the consent of the other Party ; provided, however, that either Party 
        may, without such consent, assign this Agreement and its rights and 
        obligations hereunder to any of its Affiliates or in connection with 
        the transfer or sale of all or substantially all of its business, or 
        in the event of its merger or consolidation or change in control or 
        similar transaction. Any permitted assignee shall assume all 
        obligations of its assignor under this Agreement. Without limiting 
        the generality of the foregoing, without the prior written consent of 
        PMC, CISTRON shall not under any circumstances assign or transfer any 
        CISTRON Technology in the Field of Use unless (i) all of the rights 
        and obligations of CISTRON under this Agreement are assigned to the 
        same transferee(s) concurrently therewith, and (ii) such 
        transferee(s) expressly assume(s) in writing the performance of all 
        terms and conditions of this Agreement to be performed by CISTRON and 
        such assignment shall not relieved the assignor of any of its 
        obligations under this Agreement. Each Party acknowledges that the 
        other Party would suffer irreparable injury in the event of any 
        breach of this Article 8.5. and that therefore the remedy at law for 
        any breach or threatened breach hereof by any Party shall be 
        inadequate. Accordingly, upon a breach or threatened breach hereof by 
        any Party, the other Party shall, in addition and without prejudice 
        to any other rights and remedies it may have, be entitled as a matter 
        of right, without proof of

                                   -44-
<PAGE>45

        actual damages, to seek specific performance hereof and to such other
        injunctive or equitable relief to enforce, or prevent any violations
        (whether anticipatory, continuing or future) hereof.


8.6.	Adverse Experience Reporting.
        -----------------------------

        During the term of the Agreement, each Party shall notify the other 
        immediately of any information (howsoever obtained and from whatever 
        source) concerning any unexpected side effect, injury, toxicity or 
        sensitivity reaction, or any unexpected incidence, and the severity 
        thereof, associated with the clinical uses, studies, investigations, 
        tests and marketing of a PRODUCTS. For purposes of this Article 8.6., 
        "unexpected" shall mean (x) for a non-marketed PRODUCTS, an 
        experience that is not identified in nature, severity or frequency in 
        the current clinical investigator's confidential information 
        brochure, and (y) for a marketed PRODUCTS, an experience which is not 
        listed in the current labeling for such PRODUCTS, and includes an 
        event that may be symptomatically and patho-physiologically related 
        to an event listed in the labeling but differs from the event because 
        of increased frequency or greater severity or specificity. Each Party 
        further shall immediately notify the other of any information 
        received regarding any threatened or pending action by an agency 
        which may affect the safety and efficacy claims of a Product. Upon 
        receipt of any such information, the Parties shall consult with each 
        other in an effort to arrive at a mutually acceptable procedure for 
        taking appropriate action ; provided, however, that nothing contained 
        herein shall be construed as restricting either Party's right to make 
        a timely report of such matter to any government agency or take other 
        action that it deems to be appropriate or required by applicable law 
        or regulation.


8.7.	Severability.
        -------------
        Each Party hereby agrees that it does not intend to violate any 
        public policy, statutory or common laws, rules, regulations, treaty 
        or decision of any government agency or executive body thereof of any 
        country or community or association of countries. Should one or more 
        provisions of this Agreement be or become invalid, the Parties hereto 
        shall substitute, by mutual consent, valid provisions for such 
        invalid provisions which valid provisions in their economic effect 
        are sufficiently similar to the invalid provisions that it can be 
        reasonably assumed that the Parties would have entered into this 
        Agreement with such provisions. In case such provisions cannot be 
        agreed upon, the invalidity of one or several provisions of this 
        Agreement shall not affect the validity of this Agreement as a whole, 
        unless the invalid provisions are of such essential importance to 
        this Agreement that it is to be reasonably assumed that the Parties 
        would not have entered into this Agreement without the invalid 
        provisions.


8.8.	Miscellaneous.
        --------------

8.8.1.	Notices.
        --------

	Any consent, notice or report required or permitted to be given or
        made under this Agreement by one of the Parties hereto to the other 
        shall be in writing, delivered Personally or by facsimile (and 
        promptly confirmed by Personal delivery, first class air mail or 
        courier), first class air mail or courier, postage prepaid (where 
        applicable), addressed to such other Party at its address indicated 
        below, or to such other address as the addressee shall have last 
        furnished in writing to the addressor and (except as otherwise 
        provided in this Agreement) shall be effective upon receipt by the 
        addressee.

        If to CISTRON :

        CISTRON BIOTECHNOLGY, Inc.
        10 Bloomfield Avenue
        Pine Brook, NJ 07058

                                   -45-
<PAGE>46

        Attention : Chairman
        Telecopier : (973) 575-4854
        Telephone : (973) 575-1700

        with a copy to :

        Seth I. Truwit, Esq.
        Epstein Becker & Green, PC
        250 Park Avenue
        New York, NY 10177
        Telecopier : (212) 661-0989
        Telephone : (212) 351-4709

        If to PMC :

        PASTEUR MERIEUX Serums & Vaccins, S.A.
        58, avenue Leclerc
        69007 Lyon, France
        Attention :  Senior Vice President, Legal & Corporate Affairs
                     and General Counsel
        Telecopier : 011 33 4 37 37 70 61
        Telephone : 011 33 4 37 37 77 84

        CONNAUGHT LABORATORIES Inc.
        Route 611,
        Swiftwater, PA 18370
        Attention : Vice President, Business Development
        Telecopier : (717) 839-4600
        Telephone : (717) 839-4366


8.8.2.	Applicable Law.
        ---------------

	The Agreement shall be governed by and construed in accordance with 
        the laws of the State of New York, without regard to the conflict of 
        law principles thereof.


8.8.3.	Representations, warranties and covenants.
        ------------------------------------------

8.8.3.1. Representations and Warranties of PMC.
         --------------------------------------

        (a) PMC is a Societe Anonyme duly organized and existing under the 
            laws of France, with the corporate power to own, lease and 
            operate its properties and to carry on its business as now 
            conducted.

        (b) PMC has all necessary corporate power and authority to enter into 
            this Agreement and to consummate the transactions contemplated 
            hereby.

        (c) The execution, delivery and performance of this Agreement by PMC 
            does not conflict with or contravene the statutes of PMC nor will 
            the execution, delivery or performance of this Agreement conflict 
            with or result in a breach of, or entitle any Party thereto to 
            terminate, any material agreement or instrument to which PMC is a 
            Party, or by which any of its assets or properties is bound.

        (d) This Agreement has been duly authorized, executed and delivered 
            by PMC and constitutes a legal, valid and binding agreement of 
            PMC, enforceable against PMC in accordance with its terms, except 
            as enforceability may be limited by bankruptcy, insolvency, 
            moratorium, reorganization or other similar laws affecting 
            creditors' rights generally.

                                   -46-
<PAGE>47

8.8.3.2. Representations, Warranties and Covenants of CISTRON.
         -----------------------------------------------------

        (a) CISTRON is a corporation duly incorporated and validly existing 
            as a corporation in good standing under the laws of the State of 
            Delaware with the corporate power to own, lease and operate its 
            properties and to carry on its business as now conducted.

        (b) CISTRON has all necessary corporate power and authority to enter 
            into this Agreement and to consummate the transactions 
            contemplated hereby.

        (c) The execution, delivery and performance of this Agreement by 
            CISTRON does not conflict with or contravene its certificate of 
            incorporation or by-laws, nor will the execution, delivery or 
            performance of this Agreement conflict with or result in a breach 
            of, or entitle any Party thereto to terminate, any material 
            agreement or instrument to which CISTRON is a Party, or by which 
            any of its assets or properties is bound.

        (d) This Agreement has been duly authorized, executed and delivered 
            by CISTRON and constitutes a legal, valid and binding agreement 
            of CISTRON, enforceable against CISTRON in accordance with its 
            terms, except as enforceability may be limited by bankruptcy, 
            insolvency, moratorium, reorganization or other similar laws 
            affecting creditors' rights generally.

        (e) All LICENSED PATENTS listed on Schedule A as amended from time to 
            time, have been registered in, filed in or issued by the 
            appropriate patent offices of each jurisdiction as indicated on 
            such Schedule A, and in each case is currently in effect and all 
            maintenance fees and renewals thereof have been duly made with 
            respect thereto. CISTRON owns or has full and exclusive rights to 
            use and exploit under licenses (and to license or sublicense) all 
            its rights under such LICENSED PATENTS and the LICENSED KNOW-HOW. 
            Except as set forth on schedule 8.8.3.2.(e) hereto, there have 
            been no material claims made against CISTRON asserting the 
            invalidity or non-enforceability of, or with respect to such 
            LICENSED PATENTS , the misuse of such LICENSED PATENTS or the 
            LICENSED KNOW-HOW, nor is CISTRON aware that any such claims 
            exist. Except as set forth on schedule 8.8.3.2.(e) hereto, 
            CISTRON has not received a notice of conflict of such LICENSED 
            PATENTS or the LICENSED KNOW-HOW with the asserted rights of 
            others, or otherwise challenging its rights to use any of such 
            LICENSED PATENTS, or the LICENSED KNOW-HOW. None of the rights of 
            CISTRON under the LICENSED PATENTS or LICENSED KNOW-HOW shall be 
            adversely affected by the execution, delivery or performance of 
            this Agreement, or the consummation of the transaction 
            contemplated herein. EXCEPT AS OTHERWISE EXPRESSLY SET FORTH IN 
            THIS SECTION, NEITHER PARTY MAKES ANY REPRESENTATION OR EXTENDS 
            ANY WARRANTIES OF ANY KIND EITHER EXPRESS OR IMPLIED, INCLUDING 
            BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
            PARTICULAR PURPOSE, NON-INFRINGEMENT, OR VALIDITY OF ANY PATENT 
            RIGHTS ISSUED OR PENDING.


8.8.4.	Dispute Resolution.
        -------------------

	The Parties agree that if any dispute or disagreement arises between 
        PMC on the one hand and CISTRON on the other in respect of this 
        Agreement, they shall follow the following procedure in an attempt 
        to resolve the dispute or disagreement.

        (a) The Party claiming that such a dispute exists shall give notice 
            in writing ("Notice of Dispute") to the other Party of the 
            nature of the dispute ;

        (b) Within twenty eight (28) business days of receipt of a Notice 
            of Dispute, a nominee or nominees of PMC and a nominee or 
            nominees of CISTRON shall meet in Person and exchange written 
            summaries reflecting, in reasonable detail, the nature and 
            extent of the dispute, and at this meeting they shall use their 
            reasonable endeavours to resolve the dispute ;

                                   -47-
<PAGE>48

        (c) If, within a further period of twenty eight (28) business days, 
            the dispute has not been resolved or if, for any reason, the 
            required meeting has not been held, then the Parties agree that 
            any dispute shall be referred to an arbitrator appointed by 
            agreement of CISTRON and PMC or, if no such agreement is 
            reached within sixty (60) business days after a Party commences 
            the arbitration, then by a panel of three arbitrators, with 
            each of PMC and CISTRON to select one arbitrator and those two 
            arbitrators to select the third. If all three arbitrators have 
            not been selected within sixty (60) business days after a Party 
            commences the arbitration, then the Parties agree to abide by 
            the selection of the remaining arbitrator to be named by a 
            representative of the International Chamber of Commerce. The 
            Parties agree that the Rules of the International Chamber of 
            Commerce shall govern such arbitration and that any decision of 
            the arbitrators shall be final and binding and shall be 
            enforceable in any court of competent jurisdiction worldwide 
            (regardless of whether one of the Parties fails or refuses to 
            participate in the arbitration). The Parties agree that all 
            arbitrations shall be conducted in the English language and 
            that the exclusive venue of all arbitrations shall be in 
            Zurich, Switzerland. The Party determined by the arbitrators to 
            be the Party substantially prevailing in the arbitration shall 
            be entitled to recover its legal and consultants' fees and 
            other costs reasonably incurred in connection with the 
            arbitration (as determined by the arbitrators) ; and

        (d) in the event of a dispute regarding any payments owing under 
            this Agreement, all undisputed amounts shall be paid promptly 
            when due and the balance, if any, promptly after resolution of 
            the dispute.


8.8.5.	Entire Agreement.
        -----------------

	This Agreement contains the entire understanding of the Parties with
        respect to the subject matter hereof. All express or implied 
        agreements and understandings, either oral or written, heretofore 
        made, are expressly superseded by this Agreement. This Agreement may 
        be amended, or any term hereof modified, only by a written 
        instrument duly executed by both Parties hereto.


8.8.6.	Independent Contractors.
        ------------------------

	CISTRON and PMC each acknowledge that they shall be independent 
        contractors and that the relationship between the two Parties shall 
        not constitute a partnership, joint venture or agency. Neither 
        CISTRON nor PMC shall have the authority to make any statements, 
        representations or commitments of any kind, or to take any action, 
        which shall be binding on the other Party, without the prior consent 
        of the other Party to do so.


8.8.7.	Affiliates.
        -----------

	Each Party shall cause its respective Affiliates to comply fully
        with the provisions of this Agreement to the extent such provisions 
        specifically relate to, or are intended to specifically relate to, 
        such Affiliates, as though such Affiliates were expressly named as 
        joint obligors hereunder.


8.8.8.	Waiver.
        -------

	The waiver by either Party hereto of any right hereunder or the
        failure to perform or of a breach by the other Party shall not be 
        deemed a waiver of any other right hereunder or of any other breach 
        or failure by said other Party whether of a similar nature or 
        otherwise.


8.8.9.	No Implied Licence.
        -------------------

	Nothing in this Agreement shall be deemed to constitute, by
        implication or otherwise, the grant by PMC to CISTRON, or by CISTRON 
        to PMC, of any license to, or interest in, or other rights under any 
        patent, patent application, proprietary know-how, trade secrets or 
        other intellectual property rights owned or possessed by PMC or 
        CISTRON, whichever is applicable, except as expressly provided for 
        herein.

                                   -48-
<PAGE>49
8.8.10.	Counterparts.
        -------------

	This Agreement may be executed in two or more counterparts, each of 
        which shall be deemed an original, but all of which together shall 
        constitute one and the same instrument.
        

IN WITNESS WHEREOF, the Parties have executed this Agreement as of the date 
first set forth above.


For CISTRON BIOTECHNOLOGY, INC. 



By:/s/BRUCE C. GALTON
   ------------------
Name : BRUCE C. GALTON 
Title : Chairman of the Board
        and Chief Executive Officer



For PASTEUR MERIEUX Sewrums & Vaccins S.A.



By: /s/DAVID J. WILLIAMS
    --------------------
Name : DAVID J. WILLIAMS
Title : President and
        Chief Operating Officer

                                   -49-
<PAGE>50
                                SCHEDULE A
                               ____________

                             LICENSED PATENTS


                                    -50-
<PAGE>51
                                SCHEDULE B -

                        PROVISIONS GOVERNING OWNERSHIP 

                        AND MANAGEMENT OF JOINT INVENTIONS.

                                   -51-

<PAGE> 1

	
Robert W. Naismith, Ph.D.                       800 James Avenue, Suite 201
Chairman/CEO	                                Scranton, PA  18510-1544
                                                Tel (717) 961-8944
                                                Fax (717) 961-2324
                                                Email: [email protected]

Confidential
- ------------

October 5, 1998

Mr. Bruce C. Galton
Chairman & CEO
Cistron Biotechnology, Inc.
Box 2004
10 Bloomfield Avenue                           ENGAGEMENT LETTER
Pine Brook, NJ 07058

Dear Mr. Galton:

This letter is to confirm our understanding that Cistron 
Biotechnology, Inc. ("Cistron" or the "Company") desires to 
engage Genome Securities, Inc. ("GSI") to act as the Company's 
exclusive financial advisor ("Financial Advisor") for a period 
six months and renewable at the option of the Company and GSI, 
by mutual agreement, for additional six month periods. In 
addition, during the period of such agreement, GSI will act as 
the Company's mergers and acquisitions advisor ("M&A Advisor"), 
exclusive corporate partner advisor ("Partner Advisor"), and as 
private placement agent ("Placement Agent") for any best efforts 
debt or private equity financing of the Company's Securities.

1. Financial Advisor
   -----------------

  As Financial Advisor, GSI will assist and advise the Cistron 
  on various financial matters on an as requested basis. These 
  matters include but are not limited to the following:

        - Advise Cistron on technical and scientific strategies;

        - Advise company on general corporate strategic and
          financial initiatives;

        - Consult and assist the Company with the preparation of an
          information package to be sent to potential financial 
          partners;

        - Assist the Company with structuring and negotiating terms
          and conditions of a strategic/financial partnership;

  For acting as Financial Advisor, Cistron shall pay GSI:

        -  A monthly financial advisory fee (the "Financial Advisory 
           Fee") in the amount of $10,000 payable monthly in advance. 

                            -1-
<PAGE>2

2. M&A Advisor
   -----------

   As M&A Advisor, GSI will assist and advise Cistron on an as
   requested basis in the following manner:

        - Identify, evaluate and analyze potential M&A 
          transactions;

        - Assist in negotiations;

        - Structure the transaction;

        - Assist in documentation and

        - Effect the closing of the transaction.

   For the purpose of this agreement, an Acquisition by the 
   Company shall include any acquisition, merger, consolidation, 
   tender offer, business combination or similar transaction 
   involving 50% or more of a Candidate's business, assets or 
   voting stock.

   For acting as M&A Advisor, the Company shall pay GSI a 
   transaction fee ("Transaction Fee") equal to the greater of 
   the following:

        - $100,000 at the signing of a letter of intent plus a 
          graduated percentage, 5/3/1, of the Transaction Value, 
          payable in cash promptly upon consummation of a Transaction 
          if, during the term of this agreement or within 24 months 
          thereafter, a Transaction is consummated or a definitive 
          agreement is entered into with a party that was introduced 
          to the Company by GSI that subsequently results in a 
          Transaction.  Said fee will be credited against the minimum 
          transaction fee. 

        - A minimum transaction fee of $250,000 or a graduated
          percentage shall be applied to the Transaction Value in the 
          following manner: 5% of the first $10.0 million of 
          Transaction Value, 3% of the second $10.0 million of 
          Transaction Value and 1% of the remaining Transaction Value 
          above $20.0 million.

        - For any Transaction where a party was identified by
          Cistron, a Transaction Value will be calculated in the 
          following manner: 3.5% of the first $10.0 million of 
          Transaction Value, 2.5% of the second $10.0 million of 
          Transaction Value and 1% of the remaining Transaction Value 
          above $20.0 million.

   "Transaction Value" shall mean the total proceeds and other 
   consideration paid or received or to be paid or received in 
   connection with a transaction (which consideration shall be 
   deemed to include amounts in escrow), including, without 
   limitation: (i) cash; (ii) notes, securities and other 
   property; (iii) liabilities, including all debt, pension 
   liabilities and guarantees, assumed; (iv) payments made in 
   installments; (v) amounts payable under consulting agreements, 
   agreements not to compete or similar arrangements (including 
   such payments to management); (vi) contingent payments 
   (whether or not related to future earnings or operations); and 
   (vii) if the transaction involves the disposition of assets, 
   the net value of current assets not sold. For purposes of 
   computing any fees payable to GSI hereunder, non-cash 
   consideration shall be valued as follows: (x) publicly traded 
   securities shall be valued at the average of their closing 
   prices (as reported in The Wall Street Journal) for the five 
   trading 
                          -2-
<PAGE>3

   days prior to the closing of the transaction and (y) any other
   non-cash consideration shall be valued at the fair market 
   value thereof as determined in good faith by the Company and 
   GSI. Future payments due GSI will be paid to GSI as received by 
   Cistron. 

   In addition, for acting as M&A Advisor in a Transaction, the 
   Company shall issue GSI 400,000 warrants to purchase the 
   Company Stock exercisable at the closing bid price on the date 
   of the signing this agreement which will vest upon 
   consummation of a merger or acquisition transaction.  Said 
   warrants shall have a five-year term and registration shall be 
   the sole responsibility of the company.

3. Partner Advisor
   ---------------

   As the Company's external Partner Advisor, GSI shall introduce 
   the Company to potential corporate partners ("Corporate 
   Partners") in the following manner:

        - Identify and evaluate Corporate Partners;

        - Provide The Company with a list of Corporate Partners to
          be contacted and regular written reports detailing 
          activity status;

        - Assist the Company in preparing an information package to
          be sent to Corporate Partners;

        - Assist the Company with structuring and negotiating terms
          and conditions of the Corporate Partner relationship; and 

        - Effect the closing of a Corporate Partner Transaction
          (the "Partner Transaction").

   For purposes of this agreement, a Corporate Partner 
   Transaction may include but is not limited to: (a) a joint 
   venture, partnership, license or other contract for research, 
   development, manufacturing, marketing, distribution, sale or 
   other activity; (b) the purchase of, or commitment to purchase 
   from the Company less than 50% of its business, assets or 
   voting stock; (c) the acquisition of any of the Company's 
   assets or any rights, in respect to its products and/or 
   technology; and (d) a commitment by the Candidate to provide 
   funding for all or part of the Company's research and 
   development activities, whether such work is performed or 
   managed by the Company or the candidate.
  
   For acting as Partner Advisor, Cistron shall pay GSI 7% of the 
   Corporate Partner Value, payable in cash promptly upon 
   consummation of a Partner Transaction if, during the term of 
   this agreement or within 12 months thereafter, a Partner 
   Transaction is consummated or a definitive agreement is 
   entered into with a Corporate Partner which was introduced to 
   the Company by GSI that subsequently results in a Partner 
   Transaction. In the event a successful 
   corporate partnership is consummated as a result of Cistron's 
   efforts, GSI's normal fee will be reduced by 10%.  Fees due 
   GSI will not include internal funding expended by Cistron's 
   partner unless said expenditures were define in the Partnering 
   agreement.

   "Corporate Partner Value" shall mean the total proceeds and 
   other consideration paid or received or to be paid or received 
   in connection with a Partner Transaction (which

                             -3-
<PAGE>4

   consideration shall be deemed to include amounts in escrow),
   including, without limitation: (i) cash; (ii) notes, securities
   and other property; (iii) liabilities, including all debt, pension 
   liabilities and guarantees, assumed; (iv) payments made in 
   installments; (v) amounts payable under consulting agreements, 
   agreements not to compete or similar arrangements (including 
   such payments to management); (vi) contingent payments 
   (whether or not related to future earnings or operations); and 
   (vii) if the transaction involves the disposition of assets, 
   the net value of current assets not sold. For purposes of 
   computing any fees payable to GSI hereunder, non-cash 
   consideration shall be valued as follows: (x) publicly traded 
   securities shall be valued at the average of their closing 
   prices (as reported in The Wall Street Journal) for the five 
   trading days prior to the closing of the transaction and (y) 
   any other non-cash consideration shall be valued at the fair 
   market value thereof as determined in good faith by the 
   Company and GSI.  Future payments due GSI will be paid to GSI 
   as received by Cistron.


 4. Placement Agent
   ---------------

   As Private Placement Agent for any debt or private equity 
   financing, on a best efforts basis GSI shall introduce the 
   Company to potential institutional and qualified investors 
   (the "Offering") in the following manner:

        - Consult and assist the Company with the preparation of an 
          information package ("Information Package") to be sent to 
          potential investors;

        - Introduce the Company to potential institutional and
          qualified investors;

        - Assist the Company with structuring and negotiating terms
          and conditions; and

        - Assist the Company to close on the Offering.

   For acting as Best Effort Private Placement Agent, the Company 
   shall pay GSI a placement agent fee ("Placement Agent Fee") in 
   the following manner:

        - 8% of the total gross proceeds raised from the Offering, 
          payable in cash at the closing of the Offering; plus

        - Warrants equal to 10% of the value of the Offering
          exercisable at the same price and terms as those 
          associated with the Offering 

   If at any time during a period of twelve (12) months from the 
   time of termination or expiration of this agreement the 
   Company directly or through a private placement sells any type 
   of security to an investor which was identified by GSI during 
   the term of this agreement, the Company shall pay GSI a fee 
   equal to what the Private Placement Agent Fee would have been 
   with regard to such sale.
  
   It is expressly understood and acknowledged that GSI for the 
   purpose of a public offering, will act as Cistrons exclusive 
   placement agent to identify a lead manager to undertake a 
   financing by the company on terms customary for similar 
   transactions.  In order to encourage GSI to undertake this 
   assignment it is agreed that the company will require the 
   underwriters

                             -4-
<PAGE>5

   to include GSI as a Financial Advisor to the Offering Memorandum:
   GSI will receive 20% of the underwriters commissions.

5. The term of the engagement to act as the Company's exclusive 
   Financial Advisor shall be for a period of six months. If 
   mutually agreed such engagement will be renewed every six 
   months. Subject to the provisions of paragraphs I through 4 
   and 6 through 11 and the indemnification letter which shall 
   survive any termination or expiration of this agreement, 
   either party may terminate the engagement hereunder at any 
   time, with or without cause, by giving the other party at 
   least 30 days prior written notice.

6. In order to coordinate the efforts to effect a transaction 
   satisfactory to the Company during the period of engagement 
   hereunder, including any extensions thereof, in the event that 
   the Company, or its directors, management, or shareholders 
   receive any meaningful inquiry or are otherwise aware of the 
   interest of any third party concerning any transaction 
   contemplated in paragraphs 1, 2, 3 and 4 the Company agrees to 
   promptly inform GSI of the third party and its interest and 
   request GSI's services as contemplated hereunder.

7. In connection with GSI's activities on the Company's behalf, 
   Cistron will furnish GSI with all information which it may 
   reasonably request and will provide GSI access to the 
   officers, directors, accountants and counsel of Cistron. 
   Cistron acknowledges that in rendering its services hereunder, 
   GSI shall be solely using and relying on the information 
   provided by the Company. GSI does not assume responsibility 
   for the accuracy or completeness of any information. Any 
   advice rendered by GSI pursuant to this agreement may not be 
   disclosed publicly without its prior written consent.

8. In addition to any fees that may be payable to GSI hereunder 
   (and regardless of whether a Transaction occurs), the Company 
   hereby agrees to reimburse GSI for travel and all other out of 
   pocket expenses incurred in performing its services hereunder, 
   including the fees and expenses of its legal counsel. Such 
   expense shall be submitted on a monthly basis and reimbursed 
   upon receipt. All expenses in excess of five thousand dollars 
   ($5,000) will be first approved by Cistron.  Any advertising 
   expenses to be incurred by Cistron will require prior 
   approval.

9. The Company agrees that GSI has the right to place 
   advertisements in financial and other newspapers and journals 
   describing its services to the Company hereunder upon review 
   and approval by the Company whose approval should not be 
   unreasonably withheld.


10. GSI will act under this letter agreement as an independent 
    contractor with duties to the Company. Because GSI will be 
    acting on the' Company's behalf in this capacity, it is GSI's 
    practice to receive indemnification. A copy of GSI's standard 
    indemnification form is attached to this letter.

11. GSI and Cistron mutually agree that they will not disclose 
    any confidential information received from the other party to 
    others except with the written permission of the other party

                             -5-
<PAGE>6

    or as such disclosure may be required by law. In addition, GSI 
    will use its best efforts not to undertake a conflicting 
    assignment. If such a conflict is perceived to exist, GSI will 
    notify Cistron of the possible conflict.

12. This agreement shall be governed by and construed in 
    accordance with the laws of the State of Pennsylvania 
    applicable to contracts executed in and to be performed in 
    that state.

13. All fees due BlueStone Capital Partners and/or Genome 
    Securities, Inc for previous assignments will be excluded
    from this agreement.

If the terms of our engagement as set forth in this letter are 
satisfactory to you, kindly sign and date the enclosed copy of 
this letter and indemnification form and return it to us. If 
this agreement is not executed by both parties within ten (10) 
days from its date it shall cease to be a valid offer to assist 
and represent the Company.

Very truly yours,

Genome Securities, Inc.

By:  /s/ROBERT J. NAISMITH, PH.D.
     ----------------------------
     Robert W. Naismith, Ph.D.
     Chairman and CEO

ACCEPTED AND AGREED TO as of the date hereof 10-8-1998.

CISTRON BIOTECHNOLOGY

By:  /s/BRUCE C. GALTON
     ------------------ 
        Bruce C. Galton
	Chairman and CEO

                            -6-
<PAGE>7

                        Cistron Biotechnology, Inc.
                           10 Bloomfield Avenue
                           Pine Brook, NJ 07058


October 5, 1998

Genome Securities, Inc.
800 James Avenue
Scranton, PA  18510


Gentlemen:

This letter will confirm that we have engaged GSI to advise and assist us 
in connection with the matters referred to in our letter agreement dated 
October 5, 1998 (the "Engagement Letter"). In consideration of your 
agreement to act on our behalf in connection with such matters, we agree to 
indemnify and hold harmless you and your affiliates and you and their 
respective officers, directors, employees and agents and each other person, 
if any, controlling you or any of your affiliates (you and each such other 
person being an "Indemnified Person") from and against any losses, claims, 
damages or liabilities related to, arising out of or in connection with the 
engagement (the "Engagement") under the Engagement Letter, and will 
reimburse each Indemnified Person for all expenses (including fees and 
expenses of counsel) as they are incurred in connection with investigating, 
preparing, pursuing or defending any action, claim, suit, investigation or 
proceeding related to, arising out of or in connection with the Engagement, 
whether or not pending or threatened and whether or not any Indemnified 
Person is a party. We will not, however, be responsible for any losses, 
claims, damages or liabilities (or expenses relating thereto) that are 
finally judicially determined to have resulted from the bad faith or gross 
negligence of any Indemnified Person. We also agree that no Indemnified 
Person shall have any liability (whether direct or indirect, in contract or 
tort or otherwise) to us for or in connection with the Engagement except 
for any such liability for losses, claims, damages or liabilities incurred 
by us that are finally judicially determined to have resulted from the bad 
faith or gross negligence of such Indemnified Person.

We will not, without your prior written consent, settle, compromise, 
consent to the entry of any judgment in or otherwise seek to terminate any 
action, claim, suit or proceeding in respect of which indemnification may 
be sought hereunder (whether or not any Indemnified Person is a party 
thereto) unless such settlement, compromise, consent or termination 
includes a release of each Indemnified Person from any liabilities arising 
out of such action, claim, suit or proceeding. No Indemnified Person 
seeking indemnification, reimbursement or contribution under this 
agreement will, without our prior written consent, settle, compromise, 
consent to the entry of any judgment in or otherwise seek to terminate any 
action, claim, suit, investigation or proceeding referred to in the 
preceding paragraph.

If the indemnification provided for in the first paragraph of this 
agreement is judicially determined to be unavailable (other than in 
accordance with the third sentence of the first paragraph hereof) to an 
Indemnified Person in respect of any losses, claims, damages or

                           -7-
<PAGE>8

liabilities referred to herein, then, in lieu of indemnifying such
Indemnified Person hereunder, we shall contribute to the amount paid or
payable by such Indemnified Person as a result of such losses, claims,
damages or liabilities (and expense relating thereto) (i) in such proportion
as is appropriate to reflect the relative benefits to you, on the one hand,
and us, on the other hand, of the Engagement or (ii) if the allocation
provided by clause (i) above is not available, in such proportion as is
appropriate to reflect not only the relative benefits referred to in such
clause (i) but also the relative fault of each of you and us, as well as any
other relevant equitable considerations; provided, however, in no event shall
your aggregate contribution to the amount paid or payable exceed the 
aggregate amount of fees actually received by you under the Engagement 
Letter. For the purposes of this agreement, the relative benefits to us and 
you of the Engagement shall be deemed to be in the same proportion as (a) 
the total value paid or contemplated to be paid or received or contemplated 
to be received by us or our shareholders, as the case may be, in the 
transaction or transactions that are the subject of the Engagement, whether 
or not any such transaction is consummated, bears to (b) the fees paid or 
to be paid to you under the Engagement Letter.

The provisions of this agreement shall apply to the Engagement and any 
modification thereof and shall remain in full force and effect regardless 
of any termination or the completion of your services under the Engagement 
Letter.

This agreement and the Engagement Letter shall be governed by and construed 
in accordance with the laws of the State of Pennsylvania applicable to 
contracts executed and to be performed in that state.

Very truly yours,
	
 /s/BRUCE C. GALTON
    ---------------
    BRUCE C. GALTON
for CISTRON BIOTECHNOLOGY, INC.
                                 -8-

<TABLE> <S> <C>

<ARTICLE>  5
<LEGEND>
This Schedule contains summary financial information taken from the balance 
sheet as of September 30, 1998 (unaudited) and the statement of operations 
for the three-month period ended September 30, 1998 (unaudited) and is 
qualified in its entirety by reference to the Company's Annual Report on 
Form 10-K for the fiscal year ended June 30, 1999.
</LEGEND>
       
<S>                                       <C>
<PERIOD-TYPE>                                   3-MOS
<FISCAL-YEAR-END>            		  JUN-30-1998
<PERIOD-END>                             SEP-30-1998
<CASH>                                      5,597,609
<SECURITIES>                                        0
<RECEIVABLES>                               3,268,727
<ALLOWANCES>                                 (230,000)
<INVENTORY>                                     2,548
<CURRENT-ASSETS>                            8,967,908
<PP&E>                                        727,695
<DEPRECIATION>                                702,736
<TOTAL-ASSETS>                             12,809,141
<CURRENT-LIABILITIES>                       1,055,707
<BONDS>                                             0
                               0
                                         0
<COMMON>                                      269,302
<OTHER-SE>                                 10,568,439
<TOTAL-LIABILITY-AND-EQUITY>               12,809,141
<SALES>                                       153,570
<TOTAL-REVENUES>                              290,281
<CGS>                                          79,634
<TOTAL-COSTS>                                  79,634
<OTHER-EXPENSES>                              379,543
<LOSS-PROVISION>                                    0
<INTEREST-EXPENSE>                                  0
<INCOME-PRETAX>                              (168,896)
<INCOME-TAX>                                  (64,180)
<INCOME-CONTINUING>                          (104,716)
<DISCONTINUED>                                      0
<EXTRAORDINARY>                                     0
<CHANGES>                                           0
<NET-INCOME>                                 (104,716)
<EPS-PRIMARY>                                    0.00
<EPS-DILUTED>                                    0.00
        

</TABLE>


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