IMMUNOMEDICS INC
8-K, 1999-03-24
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT

                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934


         Date of Report (Date of earliest event reported): March 5, 1999



                               IMMUNOMEDICS, INC.
             (Exact name of registrant as specified in its charter)




         Delaware                   0-12104                  61-1009366
(State or Other Jurisdiction      (Commission)              (IRS Employer
   of  Incorporation)              File Number)            Identification No.)




       300 American Road, Morris Plains, New Jersey     07950
         (Address of principal executive offices)     (Zip Code)




       Registrant's telephone number, including area code: (973) 605-8200




          (Former name or former address, if changed since last report)


<PAGE>



Item 5.  Other Events

                  IMG  Technology,  LLC  ("IMG"),  an 80%  owned  subsidiary  of
Immunomedics,   Inc.("Company"),   has  formed  a  joint  venture  with  Coulter
Corporation   ("Coulter")   for  the  purpose  of  developing   targeted  cancer
therapeutics. The joint venture, known as IBC Pharmaceuticals,  LLC ("IBC"), was
organized as a Delaware limited liability company.

                  On March 5, 1999, the Company contributed to IBC, on behalf of
IMG, certain rights to its proprietary  humanized  antibodies against the cancer
marker carcinoembryonic  antigen, which is used in its CEA-Cide(a)  therapeutic,
and  Coulter  contributed  to IBC  certain  rights to its  bispecific  targeting
technology called the "Affinity Enhancement System" or AES. The Company assigned
its rights pursuant to the terms of a license  agreement with IBC dated March 5,
1999 in exchange for the grant to IMG of a 53.28% interest in IBC ("Immunomedics
License  Agreement").  Coulter received a 46.72% interest in IBC in exchange for
its contribution.

                  The  license  granted  to IBC is a  worldwide,  royalty  free,
exclusive  license  which is  limited  to the "IBC  Field"  with  respect to the
"Immunomedics Patent Property" and the "Immunomedics  Biotechnology  Assets," as
those terms are defined in Section 1 of the Immunomedics License Agreement.

                  Additionally on March 5, 1999,  several investors  contributed
$3,000,000  to IBC in exchange for a 7% interest in the venture,  resulting in a
corresponding  reduction of IMG's and  Coulter's  interests in IBC to 49.55% and
43.45%  respectively.  Coulter,  IMG and the investors entered into an operating
agreement  (the "IBC  Operating  Agreement")  which  establishes  the rights and
obligations  of the  respective  members.  Under the terms of the IBC  Operating
Agreement,  neither IMG nor Coulter may sell any portion of its  interest in IBC
without first  providing the other with a right of first refusal with respect to
such sale,  provided  that after a public  offering of IBC  securities,  IMG and
Coulter will be permitted to sell up to 20% of their respective interests in IBC
free of such right of first refusal.

                  IMG is a Delaware limited liability  company owned 80%  by the
Company and 20% by Dr. David Goldenberg.  Dr. Goldenberg, who is the Chairman of
the Board of the Company,  received  his  interest  pursuant to the terms of his
employment  agreement  with the Company.  IMG is intended to be a single purpose
entity,  its sole asset being its interest in IBC. Dr.  Goldenberg  and IMG have
entered  into an  operating  agreement  (the "IMG  Operating  Agreement")  which
establishes their relative rights and obligations.

                  The  foregoing   summaries  of  agreements   are   necessarily
incomplete and selective and are qualified in their entirety by reference to the
agreements summarized, each of which is attached hereto as an exhibit.

                  At  a  special meeting of stockholders held on March 19, 1999,
stockholders of the Company authorized the issuance, if necessary,  of shares of
common  stock in excess of  7,577,617  shares  upon  conversion  of the Series F
Preferred Stock issued or issuable to investors in accordance with the Company's
December 1999 Private  Placement.  The terms of the Series F Preferred Stock are
more fully set forth in the Proxy Statement dated February 10, 1999 in conection
with the special meeting.

Item 7.  Financial Statements and Exhibits

         (c) Exhibits

Exhibit No.  Description

  10.1            Operating  Agreement,  dated  March 5, 1999,  by and among IMG
                  Technology,  LLC, Coulter  Corporation and the investors named
                  therein.

  10.2            License  Agreement,  dated  March  5,  1999,  by  and  between
                  Immunomedics, Inc. and IBC Pharmaceuticals, LLC.


                                        2

<PAGE>



  10.3            Operating  Agreement,  dated  March  5, 1999,  by  and between
                  Immunomedics,  Inc.,  IMG   Technology,  LLC   and   David  M.
                  Goldenberg.

  99.1            Press Release, dated March 8, 1999


                                        3

<PAGE>


                                   SIGNATURES


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


                                                      IMMUNOMEDICS, INC.


                                                       By:/s/ Robert J. DeLuccia
                                                              Robert J. DeLuccia
                                                       President and
                                                       Chief Executive Officer



Date:  March 23, 1999


                                        4

<PAGE>

                             Operating Agreement of
                            IBC Pharmaceuticals, LLC
                     (a Delaware Limited Liability Company)



                                    PREAMBLE

         This Operating Agreement (the "Agreement") of IBC Pharmaceuticals,  LLC
(the "Company"),  a limited liability company organized pursuant to the Delaware
Act,  is entered  into and made as of March 5, 1999,  by and among the  Members.
Capitalized  terms  used  herein  and  not  otherwise  defined  shall  have  the
respective meaning set forth for such terms in Article II.

         NOW,   THEREFORE,   in   consideration   of   the   mutual   covenants,
representations and warranties herein set forth, the Members agree as follows:

                         ARTICLE I - FORMATION; BUSINESS

         SECTION 1.1       Organization; Business.  (a) The Company is a limited
liability company organized pursuant to the provisions of the Delaware Act.

         (b) The Company  shall engage only in the business of  development  and
commercialization  of medical products.  The Company shall have the authority to
do all things  necessary or convenient to accomplish its purpose and operate its
business, except to the extent otherwise provided herein or in the Delaware Act.

         SECTION 1.2       Management of the Company.  (a) The management of the
Company  shall be vested in the Board of Managers of the Company as set forth in
Article III.

         (b) Unless  authorized by the Board of Managers in accordance with this
Agreement,  no Member,  in such  capacity,  shall have the  authority  to act or
purport to act on behalf of or to bind the Company.

         SECTION 1.3 Agreement;  Inconsistencies  with Delaware Act; Reliance on
this Agreement.  (a) This Agreement shall be the sole source of agreement of the
Members relating to the formation, governance and operation of the Company, and,
except to the extent a provision of this  Agreement is expressly  prohibited  or
ineffective under the Delaware Act, this Agreement shall govern.

         (b) To the extent any  provision  of this  Agreement is  prohibited  or
ineffective  under the Delaware Act, this Agreement shall be considered  amended
to the smallest degree possible in order to make such provision  effective under
the Delaware Act.


                                       -1-
<PAGE>

         (c) The Members hereby agree that each Member shall be entitled to rely
on the  provisions  of this  Agreement,  and no  Member  shall be  liable to the
Company  or to any  Member  for any action or refusal to act taken in good faith
reliance  on the terms of this  Agreement.  The  Members  hereby  agree that the
duties and obligations  imposed on the Members, in their capacity as such, shall
be  those  set  forth  in this  Agreement,  which  is  intended  to  govern  the
relationship among the Company and the Members.

         SECTION 1.4 Name. The name of the Company shall be IBC Pharmaceuticals,
LLC;  however,  such  name  may be  changed  from  time to time by the  Board of
Managers,  and all business of the Company shall be conducted under that name or
such other  name or names as may be  determined  by the Board,  but in any case,
only to the extent permitted by applicable law.

         SECTION 1.5 Effective  Date.  The Effective  Date of this  Agreement is
June 18, 1998, the date of the filing of the Company's  Certificate of Formation
with the Secretary of State of the State of Delaware notwithstanding the failure
of any Member to execute and deliver this  Agreement  until after the  Effective
Date.

         SECTION 1.6 Term.  Unless sooner  dissolved in accordance  with Article
XII  hereof,  the  Company  shall  be  dissolved  and its  affairs  wound  up in
accordance  with the Delaware Act and this Agreement on December 31, 2050 unless
such date shall be extended by amendment to this Agreement.

         SECTION 1.7  Registered  Agent and  Office.  The  registered  agent for
service of process on the Company and the Company's  registered  office shall be
as reflected in the Certificate.  The Board of Managers, may, from time to time,
change such  registered  agent or office in accordance with the Delaware Act. In
the  event the  registered  agent  ceases  to act as such for any  reason or the
registered office shall change, the Board of Managers shall promptly designate a
replacement  registered agent or file a notice of change of address, as the case
may be, in accordance with the Delaware Act.

         SECTION 1.8 Principal  Office.  The principal  place of business of the
Company (the "Principal  Office") shall be 300 American Road, Morris Plains, New
Jersey  07950.  At any time and from  time to time,  the Board of  Managers  may
change the location of the Principal Office.

         SECTION 1.9 Qualification in Other Jurisdictions. The Board of Managers
shall cause the Company to be qualified,  formed or registered  under assumed or
fictitious  names  statutes  or similar  laws in any  jurisdiction  in which the
Company  conducts  business  and  in  which  such  qualification,  formation  or
registration  is required by law or deemed  advisable  by the Board of Managers.
The Board of Managers shall cause an authorized person within the meaning of the
Delaware Act to execute,  deliver and file any certificates  (and any amendments
and/or restatements thereof) necessary for the Company to qualify to do business
in a jurisdiction in which the Company may wish to conduct business.


                                       -2-
<PAGE>

                            ARTICLE II - DEFINITIONS

         For purposes of this Agreement,  unless the context  clearly  indicates
otherwise, the following terms shall have the following meanings:

         SECTION  2.1  Additional  Member  shall  mean a Member,  other  than an
Initial  Member or a Substitute  Member,  who has acquired an Interest  from the
Company.

         SECTION  2.2  Additional  Capital  Contribution  shall  mean a  Capital
Contribution other than the Initial Capital Contribution.

         SECTION  2.3  Adjusted  Capital  Contributions  shall mean the  Initial
Capital  Contributions and Additional  Capital  Contributions made by a Series B
Preferred  Member,  decreased by  distributions to the Series B Preferred Member
(other than  distributions  of the  Preferred  Allocation)  of the amount of any
Money and the fair market  value of any  Property,  as such fair market value is
determined  by the  Board  of  Managers  at the  time  of  distribution,  net of
liabilities of the Company  assumed by the Member or subject to which the Member
takes such Property within the meaning of Section 752 of the Code.

         SECTION 2.4   Admission Agreement shall mean the  agreement  between an
Additional Member and the Company described in Section 10.3.

         SECTION 2.5   Affected Member shall have the meaning set forth for such
term in Section 13.2.

         SECTION 2.6   Affiliate of any  specified  Person  shall mean any other
Person  directly or indirectly  controlling  or controlled by or under direct or
indirect common control with such specified Person.

         SECTION 2.7   Agreement shall  have the meaning for such term set forth
in the preamble to this agreement.

         SECTION 2.8  Available Cash shall mean the amount, if any, by which the
Company's cash on hand exceeds the Company's current and anticipated cash needs,
including,  without  limitation,  needs for  operating  expenses,  debt service,
acquisitions,  reserves, and mandatory distributions, if any, as determined from
time to time by the Board of Managers in its reasonable judgment.

         SECTION 2.9 Bankrupt  Member shall mean a Member who: (i) is adjudged a
bankrupt or insolvent,  or has become the subject of an order for relief, in any
bankruptcy  or  insolvency  proceeding;  (ii)  files  a  voluntary  petition  in
bankruptcy;  (iii) makes an assignment for the benefit of creditors; or (iv) has
initiated,  either in an  original  Proceeding  or by way of answer in any state
insolvency or receivership  proceeding,  an action for liquidation  arrangement,
composition, readjustment, dissolution, or similar relief.


                                       -3-
<PAGE>

         SECTION  2.10  Board of  Managers  or  Board  shall  mean the  Board of
Managers of the Company.

         SECTION 2.11 Book  Adjustments  shall mean  adjustments with respect to
the Book Value of Company Property for  depreciation,  depletion,  amortization,
and gain or loss, as computed in accordance with Section 1.704-l(b)(2)(iv)(g) of
the Regulations.

         SECTION  2.12 Book Value  shall  mean,  (i) with  respect  to  Property
contributed  to the Company,  the fair market value (as determined by the Board)
of the Property at the time of such contribution as adjusted by Book Adjustments
and, (ii) with respect to Company  Property  which has been  Revalued,  the fair
market value (as  determined by the Board) of such Company  Property as adjusted
by Book Adjustments.

         SECTION  2.13  Business  Day shall mean any day other than a  Saturday,
Sunday or legal holiday observed in the State of New York.

         SECTION 2.14 Capital  Account shall mean the account  maintained  for a
Member in accordance with Article VI.

         SECTION  2.15  Capital  Account  Ratio shall mean,  with respect to any
Interest held of record by a Member, a fraction  (expressed as a percentage) the
numerator of which shall be the balance in the Capital  Account  associated with
such Interest as of the time in question and the  denominator  of which shall be
the  sum of the  balances  in the  Capital  Accounts  associated  with  all  the
Interests  of all the Members as of such time.  To the  extent,  but only to the
extent, specifically set forth in this Agreement, the calculation of the Capital
Account Ratio shall take into account only the Capital Accounts  associated with
the Common Interests, the Series A Preferred Interests or the Series B Preferred
Interests, as the case may be.

         SECTION  2.16 Capital  Contribution  shall mean the amount of any Money
and the fair market value of any Property (other than Money)  contributed by the
Member to the capital of the Company, as such fair market value is determined by
the Board of Managers at the time of contribution, net of liabilities assumed by
the  Company or  subject to which the  Company  takes such  Property  within the
meaning of Section 752 of the Code.

         SECTION 2.17 Certificate shall mean the Certificate of Formation of the
Company as properly adopted and amended from time to time in accordance herewith
and filed with the  Secretary  of State of the State of Delaware  in  accordance
with the Delaware Act.

         SECTION  2.18 Code shall mean the  Internal  Revenue  Code of 1986,  as
amended  from time to time,  and,  except with respect to  references  herein to
particular sections of the Code, shall include the Regulations.  With respect to
references  herein to particular  sections of the Code, such references shall be
deemed  to refer  to any  successor  provisions  thereto  of the Code and  shall
include the  Regulations  adopted  under such  particular  sections (or any such
successor provisions thereto).

                                       -4-
<PAGE>

         SECTION 2.19 Common  Member shall mean a Member who holds of record one
or more Common Units.

         SECTION  2.20  Common  Interest  shall  mean  all  of  the  rights  and
obligations  of a Common Member  hereunder with respect to the Common Units held
of record by such Common Member and the Capital  Account  associated  therewith,
including,   without  limitation,   rights  in  distributions   (liquidating  or
otherwise) and allocations of profits,  losses, gains, deductions and credits of
the Company as provided herein.

         SECTION 2.21 Common Units shall mean the Units  representing the Common
Interests.

         SECTION 2.22  Company  shall mean IBC  Pharmaceuticals,  LLC, a limited
liability  company  formed  under  the laws of the  state of  Delaware,  and any
successor limited liability company thereto.

         SECTION  2.23  Company  Liability  shall mean any  enforceable  debt or
obligation  for which the  Company  is liable  or which is  secured  by  Company
Property.

         SECTION 2.24 Company  Minimum Gain shall mean an amount  determined  by
first  computing  for each Company  Nonrecourse  Liability  any gain the Company
would realize if it disposed of the Company  Property  subject to that liability
for no  consideration  other than full  satisfaction of the liability,  and then
aggregating the separately  computed  gains.  The amount of Company Minimum Gain
includes  such minimum gain arising  from a  conversion,  refinancing,  or other
change to a debt instrument, only to the extent a Member is allocated a share of
that minimum gain. For any Taxable Year, the net increase or decrease in Company
Minimum Gain is determined by comparing the Company Minimum Gain on the last day
of the immediately  preceding Taxable Year with the Minimum Gain on the last day
of the current  Taxable  Year.  Notwithstanding  any  provision  to the contrary
contained  herein,  Company  Minimum Gain and increases and decreases in Company
Minimum Gain are intended to be computed in  accordance  with Section 704 of the
Code.  A Member's  share of Company  Minimum Gain at the end of any Taxable Year
shall equal the sum of (i)  nonrecourse  deductions,  if any,  allocated to that
Member  (and  to  that  Member's  predecessors  in  interest)  up to  that  time
(including prior years) and (ii) the  distributions  made to that Member (and to
that Member's  predecessors in interest) up to that time (including prior years)
of  proceeds  of a  nonrecourse  liability  allocable  to an increase in Company
Minimum  Gain  minus  the  sum  of (x)  that  Member's  (and  of  that  Member's
predecessors  in  interest)  aggregate  share of the net  decreases  in  Company
Minimum Gain and (y) that Members  (and that Members  predecessors  in interest)
aggregate share of decreases  resulting from  Revaluations  of Company  Property
subject to one or more Company Nonrecourse Liabilities.

         SECTION  2.25  Company  Nonrecourse  Liability  shall  mean  a  Company
Liability  to the  extent  that no  Member or  Related  Person,  other  than the
Company,  bears the economic risk of loss (as defined in Section  1.752-2 of the
Regulations) with respect to the liability.


                                       -5-
<PAGE>

         SECTION 2.26  Company  Property  shall mean any  Property  owned by the
Company.

         SECTION 2.27 Conversion  Adjustment  shall mean (i) a weighted  average
adjustment  (based  on all  outstanding  Series  A  Preferred  Units,  Series  B
Preferred  Units  and  Common  Units)  in the  event  that  the  Company  issues
additional  Interests  (other than Common  Interests sold,  granted or otherwise
issued pursuant to the Plan) at a purchase price less than the offering price of
the Series B Preferred  Units,  and (ii) a  proportional  adjustment for splits,
recapitalizations and similar transactions.

         SECTION  2.28  Current  Members  shall  mean all of the  Members of the
Company as of the date  hereof,  which  Members and the number and type of Units
held as of the date hereof are set forth on Exhibit A attached hereto.

         SECTION 2.29  Delaware Act shall mean the  Delaware  Limited  Liability
Company Act, as such act may be amended from time to time.

         SECTION 2.30  Designation  shall mean the written  action or actions of
the Board of Managers  establishing  a class or series of Interest in accordance
herewith.  Each such Designation shall be deemed an amendment and supplement to,
and shall become a part of, this Agreement in accordance with Section 5.1.

         SECTION 2.31 Director shall mean a member of the Board of Managers.

         SECTION 2.32  Disposition  (Dispose)  shall mean any sale,  assignment,
transfer, exchange,  mortgage, pledge, grant, hypothecation,  or other transfer,
absolute or as security or encumbrance,  including  dispositions by operation of
law.

         SECTION 2.33  Dissociation  shall mean any action which causes a Person
to cease to be Member as provided in Article XI hereof.

         SECTION 2.34  Dissociated  Member shall mean a Person who has ceased to
be Member as a result of Dissociation in accordance with Article XI hereof.

         SECTION 2.35  Effective  Date shall have the meaning set forth for such
term in Section 1.5.

         SECTION 2.36 GAAP shall mean generally accepted  accounting  principles
(applied  consistently)  as in  effect  on the  applicable  date or  during  the
applicable period, as the case may be.

         SECTION 2.37 Initial  Capital  Contribution  shall have the meaning set
forth for such term in Section 6.1.

         SECTION 2.38 Initial Members shall mean those persons identified as the
Initial Members on Exhibit A attached hereto.


                                       -6-
<PAGE>

         SECTION 2.39 Interest shall mean all of the rights and obligations of a
Member hereunder with respect to the Units held of record by such Member and the
Capital Account associated therewith,  including, without limitation,  rights in
distributions  (liquidating  or otherwise) and  allocations of profits,  losses,
gain", deductions,  and credits of the Company as provided herein. The Interests
shall  initially  consist  of the  Common  Interests,  the  Series  A  Preferred
Interests and the Series B Preferred Interests.

         SECTION 2.40  Majority in Interest shall mean Interests representing in
excess of 50% of the Units.

         SECTION  2.41  Member  shall  mean any  person  that holds of record an
Interest in the  Company and is admitted as a member of the Company  pursuant to
the provisions of this Agreement,  in such person's  capacity as a member of the
Company. The Members shall consist of the Common Members, the Series A Preferred
Members and the Series B Preferred  Members.  For purposes of the Delaware  Act,
the Common  Members,  the Series A Preferred  Members and the Series B Preferred
Members shall constitute separate classes of Members.

         SECTION 2.42 Member  Minimum Gain shall mean an amount  determined  by:
(a) first computing for each Member  Nonrecourse  Liability any gain the Company
would realize if it disposed of the Company  Property  subject to that liability
for no consideration other than full satisfaction of the liability, and then (b)
aggregating  the separately  computed  gains.  The amount of Member Minimum Gain
includes  such minimum gain arising  from a  conversion,  refinancing,  or other
change to a debt instrument, only to the extent a Member is allocated a share of
that minimum gain.  For any Taxable Year, the net increase or decrease in Member
Minimum Gain is determined by comparing the Member  Minimum Gain on the last day
of the immediately  preceding Taxable Year with the Minimum Gain on the last day
of the current  Taxable  Year.  Notwithstanding  any  provision  to the contrary
contained  herein,  Member  Minimum Gain and  increases  and decreases in Member
Minimum Gain are intended to be computed in  accordance  with Section 704 of the
Code.

         SECTION  2.43  Member  Nonrecourse  Liability  shall  mean any  Company
Liability to the extent the liability is nonrecourse under applicable state law,
and on which a Member or  Related  Person,  other  than the  Company,  bears the
economic risk of loss under Section 1.752-2 of the Regulations.

         SECTION  2.44 Money shall mean cash or other legal tender of the United
States,  or any obligation  that is  immediately  reducible to such legal tender
without delay or discount. Money shall be considered to have a fair market value
equal to its face amount.

         SECTION 2.45 Nonrecourse  Liabilities shall mean liabilities that under
applicable law are nonrecourse  with respect to the Company,  including  Company
Nonrecourse Liabilities and Member Nonrecourse Liabilities.


                                      -7-
<PAGE>

         SECTION  2.46  Organization  shall  mean a Person  other than a natural
person.   Organization   shall  include,   without   limitation,   corporations,
partnerships  (both  limited and general),  joint  ventures,  limited  liability
companies, and unincorporated associations, but the term shall not include joint
tenancies and tenancies by the entirety.

         SECTION 2.47 Person shall mean an  individual,  trust,  estate,  or any
incorporated or  unincorporated  organization or entity permitted under the laws
of the State of Delaware to be a member of a limited liability company.

         SECTION  2.48  Plan  shall  mean the IBC  Pharmaceuticals,  LLC  Equity
Incentive Plan, as such plan may from time to time be amended in accordance with
the terms thereof.

         SECTION  2.49  Preferred  Allocation  shall  mean for any given year an
amount equal to eight percent (8%) per annum,  determined on the basis of a year
of 365 or 366 days,  as the case may be,  for the  actual  number of days in the
period for which the Preferred  Allocation is being  determined,  cumulative but
not compounded,  of the average daily balance of Adjusted Capital  Contributions
of the Series B Preferred  Members  from time to time during the period to which
the  Preferred  Allocation  relates,  commencing  on the first date any Series B
Preferred Member is admitted to the Partnership.

         SECTION 2.50 Principal Office shall have the meaning set forth for such
term in Section 1.8.

         SECTION  2.51  Proceeding  shall mean any  judicial  or  administrative
trial, hearing or other activity,  civil, criminal or investigative,  the result
of which may be that a court,  arbitrator,  or  governmental  agency may enter a
judgment,  order,  decree,  or other  determination  which,  if not appealed and
reversed, would be binding upon the Company, a Member or other Person subject to
the jurisdiction of such court, arbitrator, or governmental agency.

         SECTION 2.52 Profit or Loss of the Company means an amount equal to the
Company's taxable income or loss under Code ss.703 (a) and Regulation ss.1.703-1
for the Taxable Year, adjusted as follows:

         (a) All items of  income,  gain,  loss,  or  deduction  required  to be
separately stated pursuant to Code ss.703(a)(1) shall be included;

         (b) Tax-exempt income as described in Code ss.705(a)(1)(B)  realized by
the Company  during such  Taxable Year shall be taken into account as if it were
taxable income;

         (c) Expenditures of the Company described in Code  ss.705(a)(2)(B)  for
such year, including items treated under Regulation  ss.1.704-l(b)(2)(iv)(i)  as
items described in Code ss.705 (a)(2)(B), shall be taken into account as if they
were deductible items;


                                       -8-
<PAGE>

         (d)  With  respect  to  Property  (other  than  Money)  which  has been
contributed to the capital of the Company,  Profit and Loss shall be computed in
accordance  with  the  provisions  of  Regulation   ss.1.704-l(b)(2)(iv)(g)   by
computing  depreciation,   amortization,  gain,  or  loss  upon  the  value  (as
determined by the Board) of such property on the books of the Company;

         (e) With respect to any Company  Property which has been the subject of
a Revaluation pursuant to Section 6.4 or a revaluation event pursuant to Section
6.3, Profit or Loss  subsequent to such  revaluation  shall be determined  based
upon the fair market value of such property as determined in such revaluation;

         (f)  Interest  paid on  loans  made to the  Company  by a  Member,  and
salaries,  fees, and other  compensation  paid to any Member shall be treated as
deductible items in computing Profit and Loss.

         SECTION  2.53  Property  shall  mean  any  property  real or  personal,
tangible or intangible (including  goodwill),  including Money, and any legal or
equitable  interest in such  property,  but excluding  services and promise.  to
perform services in the future.

         SECTION 2.54 Qualified Offering shall mean a firmly underwritten public
offering  of equity of the  Company  for a total  offering  of not less than $15
million (after  deduction of underwriters  commissions and expenses) or upon the
closing of a rights or similar  offering to the holders of the Company's  equity
or to any holders of the equity of  affiliates  of the Company  which raises net
proceeds  for the  Company  of not less than $15  million  (after  deduction  of
underwriters  commissions  and  expenses)  following  which the Company  becomes
subject to the reporting requirements of the Securities Exchange Act of 1934, as
amended.

         SECTION 2.55 Regulations shall mean, except where the context indicates
otherwise,  the permanent,  temporary,  or proposed and temporary regulations of
the United  States  Department  of the Treasury  promulgated  under the Internal
Revenue Code of 1986, as amended from time to time, as such  regulations  may be
lawfully changed from time to time.

         SECTION 2.56 Related  Person shall mean a person having a  relationship
to a Member that is described in Section  1.752-4(b) of the Regulations,  or any
successor provision.

         SECTION 2.57 Revaluation shall mean the adjustment to the Book Value of
Company Property as provided in Section 6.4.

         SECTION  2.58   Revaluation  Date  shall  mean  the  date  on  which  a
Revaluation Event occurs.

         SECTION 2.59 Revaluation Event shall mean (i) the admission of a Member
in  accordance  with  Article X (other than the  admission  of (a) a  Substitute
Member), or (b) a Series B Preferred Member on or prior to March 1, 1999 or such
later  date as may be set by the  Board  of  Managers,  (ii) a  contribution  of
Property to the Company by a Member in respect of an Interest (other than a de

                                       -9-
<PAGE>

minimis amount), (iii) a liquidating  distribution of Property by the Company to
a  Member  in  complete  liquidation  of such  Members  Interest,  or  (iv)  the
liquidation of the Company.

         SECTION 2.60 Series A Preferred  Interest  shall mean all of the rights
and  obligations  of a Series A Preferred  Member  hereunder with respect to the
Series A Preferred  Units held of record by such  Series A Preferred  Member and
the Capital Account associated therewith,  including, without limitation, rights
in distributions  (liquidating or otherwise) and allocations of profits, losses,
gains, deductions and credits of the Company as provided herein.

         SECTION 2.61 Series B Preferred  Interest  shall mean all of the rights
and  obligations  of a Series B Preferred  Member  hereunder with respect to the
Series B Preferred  Units held of record by such  Series B Preferred  Member and
the Capital Account associated therewith,  including, without limitation, rights
in distributions  (liquidating or otherwise) and allocations of profits, losses,
gains, deductions and credits of the Company as provided herein.

         SECTION 2.62 Series A Preferred Member shall mean a Member who holds of
record one or more Series A Preferred Units.

         SECTION 2.63 Series B Preferred Member shall mean a Member who holds of
record one or more Series B Preferred Units.

         SECTION 2.64 Series A Preferred Units shall mean the Units representing
the Series A Preferred Interests.

         SECTION 2.65 Series B Preferred Units shall mean the Units representing
the Series B Preferred Interests.

         SECTION  2.66  Substitute  Member  shall mean a Person who  acquired an
Interest  from a Member and who has been  admitted as a Member  pursuant to this
Agreement.

         SECTION 2.67  Taxable  Year shall mean the calendar  year or such other
taxable  year of the Company  established  by the Board of Managers  pursuant to
Section 706 of the Code.

         SECTION 2.68 Taxing  Jurisdiction  shall mean the United States federal
and any state,  local,  or foreign  government  that collects  tax,  interest or
penalties,  however  designated,  on any  Members  share of the  income  or gain
attributable to the Company.

         SECTION 2.69 Tax Matters  Partner  shall have the meaning set forth for
such term in Section 8.3.

         SECTION 2.70 Term shall have the meaning set forth in Section 1.6.

         SECTION  2.71 Units  shall have the  meaning set forth for such term in
Section 5.1.

                                      -10-
<PAGE>

                         ARTICLE III - BOARD OF MANAGERS

         SECTION  3.1  Powers of the  Board.  (a) The  business  affairs  of the
Company  shall be  managed  by the Board of  Managers  in  accordance  with this
Agreement. The Board may exercise all such powers of the Company and do all such
lawful  acts and  things as are not by  statute or this  Agreement  directed  or
required to be exercised or done by the Members.

         (b)  Except  as  otherwise  provided  in this  Agreement,  the Board of
Managers  may  delegate  any or all of its  powers  to  committees  of the Board
established  by the Board,  and to officers and agents  elected or designated by
the Board or a duly constituted committee thereof.

         SECTION 3.2 Current Board Members. The Board of Managers of the Company
as of the date  hereof  consists  of five (5)  persons  identified  on Exhibit B
hereto.

         SECTION  3.3  Records to be  Maintained.  The Board of  Managers of the
Company shall maintain, or cause to be maintained,  the following records at the
Principal Office:

         (a) A  current  list of the  full  name  and  last  known  business  or
residence  address of each Member and former  Member and the Capital  Account of
each  Member  associated  with  their  respective  Interests,  as  of  a  recent
practicable date;

         (b) A copy of the Certificate and all amendments thereto;

         (c) Copies of the Company's  federal,  foreign,  state and local income
tax returns and reports, if any, for the seven most recent years;

         (d) Copies  of  this  Agreement,  including  all  subsequent amendments
thereto; and

         (e) Copies of all  financial  statements  of the  Company for the seven
most recent years.

         SECTION 3.4 Reports to Members. (a) The Board of Managers shall provide
(or cause the  Company to provide)  reports at least  annually to the Members at
such time (but not later than 90 days after the end of each  fiscal  year of the
Company,  unless good cause is shown) and in such manner as it shall  reasonably
determine,  which reports shall include (i) a balance sheet of the Company as of
the close of the last  completed  fiscal year, a statement of income showing the
results of operation of the Company  during such year, and a cash flow statement
showing the cash  receipts and  disbursements  of the Company  during such year,
each prepared in accordance  with GAAP,  (ii) a statement  showing each Member's
share of Profit or Loss of the  Company  for such  year,  and (iii)  such  other
information  as the Board deems  appropriate.  The Board shall provide (or cause
the Company to provide) all Members with the information returns required by the
Code and the laws of any applicable state in a timely manner.

         (b) The Company shall deliver to any holder of Series A Preferred Units
or Series B Preferred  Units,  or Common  Units  issued upon  conversion  of the
Preferred Units, which Units

                                      -11-
<PAGE>

represent greater than 5% of the outstanding Units, customary audited annual and
unaudited quarterly financial statements. This provisions shall terminate upon a
Qualified Offering.


                    ARTICLE IV - RIGHTS AND DUTIES OF MEMBERS

         SECTION 4.1 General Rights. All Members shall be entitled to all of the
rights  associated  with  membership in the Company set forth in this Agreement,
including without  limitation,  the right to vote in accordance  herewith on any
matter required hereunder to be submitted to a vote of the Members and the right
to receive  distributions  of Company  Property for such Member's  Interest upon
dissolution of the Company as provided in Article XII.

         SECTION 4.2 No Right to Withdraw. (a) No Member shall have the right to
withdraw  as a Member of the  Company,  Dispose  of its  Interest,  receive  any
distributions  of Company  Property  in respect of such  Interest or to have its
Interest  redeemed by the Company prior to the dissolution of the Company,  even
if such Member  Dissociates,  except as provided herein. Upon the dissolution of
the Company, the Members' rights to receive distributions of Company Property in
respect of the Interests shall be as set forth in Article XII.

         (b) The  provisions in this Section with respect to a Member's right to
receive  distributions of Company Property in respect of such Member's  Interest
upon withdrawal from the Company, Dissociation or dissolution of the Company are
exclusive  and no Member  shall be entitled  to claim any  further or  different
payments or distributions upon any such withdrawal,  Dissociation or dissolution
under Section 18-604 of the Delaware Act or otherwise.

         SECTION 4.3 Limited Liability of Members.  No Member shall be obligated
personally for any debt, obligation or liability of the Company, whether arising
in contract, tort or otherwise,  solely by reason of being a Member. The failure
of the  Company to observe  any  formalities  or  requirements  relating  to the
exercise  of its powers or  management  of its  business  or affairs  under this
Agreement  or the  Delaware  Act  shall not be  grounds  for  imposing  personal
liability on the Members for liabilities of the Company.

         SECTION  4.4  Representations  and  Warranties.   Each  Current  Member
represented  and warranted to the Company as of the date of his or its admission
as a Member,  and each person who after the date hereof  becomes a Member shall,
by executing and delivering to the Company a counterpart  signature page hereto,
represent  and warrant to the Company and each other  Member  that:  (a) if that
Member is an  Organization,  that as of the date of its admission as a Member it
is duly organized,  validly existing,  and in good standing under the law of its
state of organization and that as of such date it has full organizational  power
to execute and deliver this Agreement and to perform its obligations  hereunder;
(b) that the Member  acquired  its  Interest in the Company for the Member's own
account as an investment and without an intent to distribute  the Interest;  (c)
the Member  was aware  that the  Interests  have not been  registered  under the
Securities Act of 1933, as amended, or any state securities laws, and may not be
resold or  transferred  by the Member without  appropriate  registration  or the
availability of an exemption from such requirements and then only upon

                                      -12-
<PAGE>

compliance with the terms and conditions set forth in this Agreement; and (d) if
that Member is an  Organization,  immediately  following the  acquisition of its
Interest, the value of such Interest,  together with the value of all securities
owned by such  Member of all  issuers  which are or would be  excluded  from the
definition of investment  company  solely by Section  3(c)(1) of the  Investment
Company Act of 1940, as amended (but for the exception set forth in subparagraph
(A) of such  Section),  would not exceed ten percent  (10%) of the value of such
Member's total assets.

                      ARTICLE V - DESCRIPTION OF INTERESTS

         SECTION 5.1 Classes and Series of  Interests.  (a) The Interests in the
Company shall be initially divided into three classes, the Common Interests, the
Series A Preferred Interests and the Series B Preferred  Interests.  The holders
of record of the  different  classes  and  series of  Interests  shall have such
rights and obligations  associated  with such Interests as are provided  herein.
Other preferred  Interests may be issued from time to time in one or more series
with such relative rights, powers, preferences,  limitations and restrictions as
may from time to time be  established  in a written  action or  actions  (herein
referred to as a "Designation") of the Board of Managers providing for the issue
of such series of preferred  Interests as provided in and  expressly  subject to
the limitations of this Article.

         (b) The Interests shall be evidenced by units (the "Units") which shall
not be evidenced by any certificate or other written instrument,  but shall only
be evidenced by this  Agreement  and the holders of record of the Units shall be
as is reflected on the books of the Company.

         (c) The total  number of Units of all  classes of  Interests  which the
Board of Managers  shall have the  authority to issue shall be  39,000,000,  and
shall consist of: (i) 7,000,000  Series A Preferred  Units, all of one class and
series;  (ii) 2,000,000  Series B Preferred  Units, all of one class and series;
and  (iii)  15,000,000  Common  Units,  all of one class  and  series;  and (iv)
15,000,000 Units, which shall be available to be issued as Common Units (subject
to the limitation  contained in Section 5.2), Series A Preferred Units, Series B
Preferred Units or other preferred Units under such other series as the Board of
Managers designates from time to time in accordance  herewith),  in such amounts
and between  such  classes and among such series as the Board of Managers or any
authorized  committee  thereof shall determine from time to time in its sole and
absolute discretion.

         SECTION 5.2 Common Units.  The granting and issuance of Common Units to
employees, directors, managers and consultants shall be subject to the terms and
conditions  contained herein and in the Plan;  provided,  however, to the extent
any  provision  of the Plan is deemed to  conflict  with any  provision  of this
Agreement,  this Agreement  shall  control.  No Common Units shall be granted or
issued to employees,  directors,  managers and consultants if the effect of such
grant or issuance would be to increase the number of Common Units outstanding to
a number  in excess of 10% of the  total  number  of Units of all  classes  then
outstanding  (taking  into  account  any  outstanding  Common  Units  issued  to
employees, directors, managers and consultants).


                                      -13-
<PAGE>

         SECTION 5.3 Series A Preferred  Units.  (a) There  shall  initially  be
7,000,000 Series A Preferred Units representing  92.10% of the total outstanding
Units.

         (b) The Series A Preferred  Units shall be  convertible at the election
of  the  holder  into  Common  Units  on a  one-for-one  basis,  subject  to the
Conversion Adjustment.

         (c) The Series A Preferred Units shall be automatically  converted into
Common Units on a one-for-one basis,  subject to the Conversion  Adjustment,  in
the event that (i) the holders of at least 51% of the then outstanding  Series A
Preferred  Units  consent  to such  conversion  or (ii)  upon the  closing  of a
Qualified Offering.

         (d) For so long as at least 70% of the Series A Preferred  Units remain
outstanding,  consent of the holders in-interest of at least 75% of the Series A
Preferred Units shall be required for any action that:

                           (i)   adversely   alters  or  changes   the   rights,
                  preferences or privileges of the Series A Preferred Interests,

                           (ii) creates (by  reclassification  or otherwise) any
                  new  class  or  series  of  preferred   Interests   (or  other
                  securities) having rights, preferences or privileges senior to
                  or on a parity with the Series A Preferred Interests,

                           (iii) results in the  redemption of Interests  (other
                  than pursuant to the Plan or other equity incentive agreements
                  with  service  providers  giving  the  Company  the  right  to
                  repurchase Interests upon the termination of service),

                           (iv)   results  in  any   merger,   other   corporate
                  reorganization,  sale of control,  or any transaction in which
                  all or  substantially  all of the  assets of the  Company  are
                  sold,

                           (v) amends or waives any  provision of the  Company's
                  Certificate  of Formation or Operating  Agreement  relative to
                  the Series A Preferred Interests,

                           (vi) increases the  authorized  size of the Company's
                  Board of Managers,

                           (vii)  results  in any  distribution  to the  Members
                  other  than the  Preferred  Allocation  and  distributions  to
                  Members to pay taxes in accordance with Section 7.5, or

                           (viii)   causes   the   Company   to   convert  to  a
                  corporation.

         (e) Holders of Series A Preferred Interests shall have the right in the
event the Company proposes to offer Interests or other securities of the Company
to any person for cash (other than Common  Interests issued pursuant to the Plan
or other equity incentive  agreements with service providers) to purchase all or
any portion of such Interests or other securities. Such Interests or other

                                      -14-
<PAGE>

securities  shall be offered to holders  of Series A  Preferred  Interests  on a
pro-rata  basis.  Any Interests or securities not subscribed for by a holder may
be reallocated among the other holders of Series A Preferred  Interests.  If the
holders  of  Series  A  Preferred  Interests  do not  subscribe  for all of such
Interests or other securities, that portion that is not purchased may be offered
to other  parties on terms no less  favorable  to the Company.  Such  preemptive
right will terminate upon a Qualified Offering.

         SECTION 5.4 Series B Preferred  Units.  (a) There  shall  initially  be
600,034 Series B Preferred  Units  representing  7.90% of the total  outstanding
Units.

         (b) The  holders of Series B  Preferred  Units shall be entitled to the
Preferred Allocation as provided in Section 2.49.

         (c) The Series B Preferred  Units shall be  convertible at the election
of  the  holder  into  Common  Units  on a  one-for-one  basis,  subject  to the
Conversion Adjustment.

         (d) The Series B Preferred Units shall be automatically  converted into
Common Units on a one-for-one basis,  subject to the Conversion  Adjustment,  in
the event that (i) the holders of at least 51% of the then outstanding  Series B
Preferred  Units  consent  to such  conversion  or (ii)  upon the  closing  of a
Qualified Offering.

         (e) For so long as at least 75% of the Series B Preferred  Units remain
outstanding,  consent of the holders of at least 51% in-interest of the Series B
Preferred Units shall be required for any action that:

                           (i)   adversely   alters  or  changes   the   rights,
                  preferences or privileges of the Series B Preferred Interests,
                  or

                           (ii) creates (by  reclassification  or otherwise) any
                  new class or series of Interests having rights, preferences or
                  privileges  senior  to  or  on a  parity  with  the  Series  B
                  Preferred Interests.

         SECTION 5.5 Other Units. (a) Authority is hereby  expressly  granted to
the Board of  Managers,  subject to the  provisions  of this  Agreement  and the
approval  of the  Series  A  Preferred  Interests  and the  Series  B  Preferred
Interests  in  accordance  with Section 5.3 and Section  5.4,  respectively,  to
authorize  the  issuance  of one or more series or classes of  Interests  and to
establish  each such series by a written  action or actions  (including  without
limitation  an  amendment  to this  Agreement)  providing  for the issue of such
series.

         SECTION  5.6  Preferred  Allocation.  (a) To  the  extent  provided  in
subsection  (b) of this  Section,  there shall  accumulate  with respect to each
outstanding  Series B Preferred  Unit, in  preference  to any  allocation to the
Series A Preferred Interests and the Common Interests, an annual amount equal to
the Preferred Allocation.


                                      -15-
<PAGE>

         (b) (i) The Preferred Allocation with respect to the outstanding Series
B Preferred Units held of record on December 31 of such year shall accumulate as
of such date, whether or not there shall be (at the time such amounts accumulate
or at any other time)  Profit  sufficient  to make an  allocation  equal to such
amounts to the Capital  Accounts of the  Preferred  Members in  accordance  with
Section VII (due to the  allocations  of profits losses  contained  therein) and
whether or not the  distribution  of property in an amount equal to such amounts
shall have been  authorized  by the Board of  Managers or  permitted  hereunder.
Accumulated and undistributed Preferred Allocation shall not bear interest.

         (c)  Profit in an amount  equal to the  Preferred  Allocation  shall be
allocated to the Capital Accounts of the Series B Members only to the extent and
as provided in Section 7.1,  and  property in an amount  equal to the  Preferred
Allocation  shall be distributed  to the Series B Preferred  Members only to the
extent and as provided in Section 7.5.

         SECTION 5.7 Voting. (a) Except as otherwise  expressly provided in this
Agreement or the  Designation  with respect to any class or series of Interests,
(i) the holders of Units shall have full voting  rights and powers with  respect
to all matters required hereunder to be submitted to the vote, or which requires
the  consent,  of the Members and each Unit shall be entitled to one vote on all
such  matters,  and (ii) the Common  Units,  the Series A Preferred  Units,  the
Series B Preferred  Units,  and all other  classes or series of Units shall vote
together as a single class on all such matters.

         SECTION 5.8 Purchase of Interests by the Company. The Board of Managers
shall not, unless consented to by the holders of Series A Preferred Interests in
accordance  with  Section  5.3(d),  purchase,  redeem or  otherwise  acquire any
Interests.  Notwithstanding  the preceding  sentence and Section 5.3(d),  if the
Board of Managers in its reasonable judgment determines that, for the purpose of
maintaining for the Company an exemption from the  registration  requirements of
the Investment  Company Act of 1940, as amended,  the Company  should  purchase,
redeem or otherwise  acquire  Interests from any Member or Members,  the Company
may purchase,  redeem or otherwise  acquire such  Interests  from such Member or
Members,  on such terms and conditions as the Board shall reasonably  determine,
to the  extent  and in the  manner  (which  need not be pro rata)  necessary  or
advisable to maintain such exemption.

         SECTION 5.9   Status of Unit Redeemed, Transferred or Dissociated.  (a)
All Units  redeemed,  purchased  or otherwise  acquired by the Company  shall be
canceled and thereupon restored to the status of authorized but unissued Units.

         (b) All Units  held by persons  who are not  Members,  whether  through
Dissociation  or otherwise,  shall not be deemed  outstanding for purpose of any
vote,  consent or other action of the Members  required or  permitted  under the
Delaware Act or this Agreement.

         SECTION 5.10  Preemptive and Appraisal  Rights.  Except with respect to
the Series A Preferred  Interests pursuant to Section 5.3(e), no Member shall be
entitled  as a  matter  of  right  to  subscribe  for or  purchase,  or have any
preemptive right with respect to, any part of any new or additional  issuance of
Units of any class or series whatsoever, or of securities convertible into any


                                      -16-
<PAGE>

Units of any class or series whatsoever, whether now or hereafter authorized and
whether issued for cash or other  consideration  or by way of  distribution.  No
Member shall have any appraisal  rights under Section 18-210 of the Delaware Act
or otherwise.

         SECTION 5.11 Persons Deemed  Members.  The Company may treat the Person
in whose name any Interest  shall be  registered on the books and records of the
Company  as a Member  and the sole  holder  of such  Interest  for  purposes  of
receiving  distributions and for all other purposes whatsoever and, accordingly,
shall not be bound to recognize  any equitable or other claims to or interest in
such Interest on the part of any other Person,  whether or not the Company shall
have actual or other notice thereof.

                 ARTICLE VI - CONTRIBUTIONS AND CAPITAL ACCOUNTS

         SECTION 6.1    Initial Capital Contributions.  (a)  As of the Effective
Date,   each  Initial  Member  is  deemed  to  have  made  the  Initial  Capital
Contribution described for that Member on Exhibit A.

         (b) Except to the extent expressly agreed to in writing by the Company,
no interest shall accrue at any time on any  contribution  to the capital of the
Company or on any Members  Capital  Account.  No Member  shall have the right to
Dispose of its  Interest,  except to the extent  provided in Section  9.1, or be
repaid any contribution or any part of such Member's Capital Account,  except to
the extent provided in Article VII (relating to distributions)  and Section 12.3
(relating to dissolution).

         (c) Each  Additional  Member shall make the  contribution,  if any, and
shall perform any commitment  described in the Admission  Agreement entered into
between the  Company and such  Additional  Member.  The value of the  Additional
Members  contribution  and the time for making  such  contribution  shall be set
forth in such Admission Agreement.

         SECTION 6.2  Maintenance  of Capital  Accounts.  (a) The Company  shall
establish and maintain a separate  Capital  Account for each Member.  The amount
credited to the Capital Accounts of the Initial Members as of the Effective Date
is the respective  amounts set forth under the column "Value of Contribution" on
Exhibit A hereto. Each Additional Member's Capital Account shall initially equal
the fair market value (as such fair market value is  determined  by the Board at
the time of  contribution),  net of liabilities  assumed by the Company,  of the
Property  contributed  by such  Member to the  capital of the  Company  for such
Member's Interest.

         (b) Each Member's  Capital Account shall be increased by (i) the amount
of any additional Money contributed by the Member to the capital of the Company,
(ii) the fair  market  value  of any  additional  Property  (other  than  Money)
contributed  by the Member to the  capital of the  Company,  as such fair market
value is determined by the Board of Managers at the time of contribution, net of
liabilities  assumed by the Company or subject to which the  Company  takes such
Property  within the meaning of Section 752 of the Code,  and (iii) the Member's
share of Profits as determined in accordance with Article VII.


                                      -17-
<PAGE>

         (c) Each Member's  Capital Account shall be decreased by (i) the amount
of any Money  distributed  to the Member by the  Company,  (ii) the fair  market
value of any Property  distributed  to the Member,  as such fair market value is
determined  by the  Board  of  Managers  at the  time  of  distribution,  net of
liabilities of the Company  assumed by the Member or subject to which the Member
takes such Property within the meaning of Section 752 of the Code, and (iii) the
Member's share of Losses as determined in accordance with Article VII.

         SECTION  6.3  Adjustments  to Capital  Accounts  upon  Distribution  of
Assets.  If the Company at any time distributes any Company Property (other than
Money)  in-kind to any  Member,  the  Capital  Account of each  Member  shall be
adjusted,  to the extent not  previously  adjusted  pursuant to Section  6.4, to
account for that Member's  allocable  share (as  determined  in accordance  with
Article  VII below) of the Profit or Loss that would have been  realized  by the
Company had it sold the assets that were  distributed at their  respective  fair
market values immediately prior to their distribution.

         SECTION 6.4 Revaluation of Company  Property.  The Capital  Accounts of
the Members shall be increased or decreased to reflect a Revaluation  of Company
Property  (including  intangible assets such as goodwill) on the Company's books
upon the occurrence of a Revaluation Event. Upon such Revaluation:  (i) the Book
Value of all Company  Property  shall be adjusted based on the fair market value
(as  determined  by the Board) of such  Company  Property  (taking  into account
Section  7701(g) of the Code) on the  Revaluation  Date; and (ii) the unrealized
income, gain, loss, or deduction with respect to such Company Property (that has
not been reflected in the Capital Accounts  previously) shall be allocated among
the Members as if there were a taxable  disposition of such Company property for
such fair market value on the  Revaluation  Date. In the event the Book Value of
any  Company  Property  is  adjusted   pursuant  to  this  Section,   subsequent
allocations of income,  gain, loss and deduction for purposes of Federal,  state
and local  taxes  with  respect  to such  property  shall  take  account  of any
variation  between the adjusted  basis of such  property for Federal  income tax
purposes and its Book Value in the same manner as under Code Section 704(c).

         SECTION  6.5  Transfer  of  Capital  Accounts.  In the event of a sale,
exchange or other  transfer of some or all of an Interest and only to the extent
such sale or exchange is permitted hereunder,  the Capital Account of the Member
transferring  such Interest (and the Preferred  Allocation,  if not reflected in
the Capital Account) shall become the Capital Account (and Preferred Allocation)
of the  transferee  to the  extent it relates  to the  portion  of the  Interest
transferred.  Such  transferee  shall be deemed a Member only in accordance with
Article X.

         SECTION 6.6 Compliance  with Section 704(b) of the Code. The provisions
of this  Article  as they  relate to the  maintenance  of Capital  Accounts  are
intended,  and shall be  construed,  and, if necessary,  modified,  to cause the
allocations of profits, losses, income, gain and credits pursuant to Article VII
to have  substantial  economic  effect under the Regulations  promulgated  under
Section  704(b) of the Code,  in light of the  distributions  made  pursuant  to
Article VII and the  contributions to the Company made pursuant to this Article.
Notwithstanding  anything  herein to the contrary,  this Agreement  shall not be
construed as creating a deficit restoration obligation or to otherwise


                                      -18-
<PAGE>

personally  obligate  any  Member  to  make  a  contribution  in  excess  of the
contribution of the Member required by Section 6.1.

                   ARTICLE VII - ALLOCATIONS AND DISTRIBUTIONS

         SECTION 7.1  Allocations of Profit and Loss.  Except as may be required
by Section 704(c) of the Code and Sections 7.2, 7.3, and 7.4 of this Article:

         (a) the Company's  Loss for each Taxable Year shall be allocated to the
Capital  Accounts of the Members,  as of the close of business for such year, as
follows:

                  (i) First, to the holders of the Series B Preferred  Interests
(on a per  Unit  basis)  until  the  Capital  Accounts  in  respect  of all such
Interests are reduced to zero;

                  (ii)  Second,  among the  holders  of the  Series A  Preferred
Interests (on a per Unit basis) until the Capital Accounts in respect of all the
Series A Preferred Interests are reduced to zero;

                  (iii) Third,  among the holders of the Common  Interests (on a
per Unit  basis)  until  the  Capital  Accounts  in  respect  of all the  Common
Interests are reduced to zero; and

                  (iv)  Lastly,  all of the  remaining  Loss shall be  allocated
among the  holders of the  Common,  Series A  Preferred  and Series B  Preferred
Interests (on a per Unit basis without regard to class or series).

         (b) the  Company's  Profit for each  Taxable Year shall be allocated to
the Capital Accounts of the Members,  as of the close of business for such year,
as follows:

                  (i) First, to any Members with negative Capital Accounts (on a
per Unit basis) until such Members' Capital Accounts equal zero;

                  (ii)  Second,  to  the  holders  of  the  Series  B  Preferred
Interests  (on a per Unit  basis)  in an amount  equal to the  excess of (x) the
amount  of  all  Losses  allocated  to  such  Interests  from  the  date  of the
establishment of the Capital  Accounts in respect of such Interests  through the
close of business for such Taxable Year pursuant to clause (a)(i) above over (y)
the amount of Profit  allocated  to such  holders  in  respect of such  accounts
pursuant to this clause (b)(ii) for all prior Taxable Years;

                  (iii)  Third,  to  the  holders  of  the  Series  A  Preferred
Interests  (on a per Unit  basis)  in an amount  equal to the  excess of (x) the
amount  of  all  Losses  allocated  to  such  Interests  from  the  date  of the
establishment of the Capital  Accounts in respect of such Interests  through the
close of business for such Taxable Year  pursuant to clause  (a)(ii)  above over
(y) the amount of Profit  allocated to such holders in respect of such  accounts
pursuant to this clause (b)(iii) for all prior Taxable Years;


                                      -19-
<PAGE>

                  (iv) Fourth,  to the holders of the Common Interests (on a per
Unit  basis) in an amount  equal to the  excess of (x) the  amount of all Losses
allocated to such  Interests from the date of the  establishment  of the Capital
Accounts in respect of such  Interests  through  the close of business  for such
Taxable  Year  pursuant to clause  (a)(iii)  above over (y) the amount of Profit
allocated  to such holders in respect of such  accounts  pursuant to this clause
(b)(iv) for all prior Taxable Years;

                  (v) Fifth, to the holders of the Series B Preferred  Interests
(on a per Unit  basis) in an amount  equal to the  excess of (x) all  Preference
Allocations  accumulated  with  respect to such  Interests  through the close of
business for such Taxable  Year  pursuant to Article V, over (y) all  Preference
Allocations  allocated  to such  holders in respect of such  Series B  Preferred
Interests for all prior Taxable Years pursuant to this clause (v);

                  (vi) Lastly,  all  remaining  Profit shall be allocated to the
Common,  Series A Preferred and Series B Preferred  Members (on a per Unit basis
without regard to class or series).

         SECTION 7.2 Company Minimum Gain Chargeback. If there is a net decrease
in Company Minimum Gain for a Taxable Year, each Member shall be allocated items
of income and gain for that Taxable Year equal to that Person's share of the net
decrease in Company  Minimum  Gain. A Member shall not be subject to the Company
Minimum Gain  chargeback  requirement of this Section to the extent the Member's
share of the net  decrease  in Company  Minimum  Gain is caused by a  guarantee,
refinancing,  or  other  change  in the debt  instrument  causing  it to  become
partially or wholly a Recourse Liability or a Member Nonrecourse Liability,  and
the  Member  bears the  economic  risk of loss  (within  the  meaning of Section
1.752-2 of the Regulations) for the newly guaranteed,  refinanced,  or otherwise
changed liability.

         SECTION 7.3 Member  Minimum Gain  Chargeback.  If during a Taxable Year
there is a net decrease in Member  Minimum Gain, any Member with a share of that
Member  Minimum Gain as of the beginning of that Taxable Year shall be allocated
items of  income  and gain  for  that  Taxable  Year  (and,  if  necessary,  for
succeeding Taxable Years) equal to that Members share of the net decrease in the
Company Minimum Gain.

         SECTION 7.4 Qualified Income Offset.  Notwithstanding  any provision of
this  Agreement  to the  contrary,  in the event  that a deficit  in a  Member's
Capital  Account is created or increased  (taking into account any  allocations,
adjustments,  or  distributions  described in Sections  1.704-l(b)(2)(ii)(d)(4),
(5),  or (6) of the  Regulations)  in excess of such  Member's  share of Company
Minimum Gain and Member Minimum Gain, plus the amounts,  if any, that the Member
is obligated to restore to the Company,  such Member shall be allocated items of
income  and gain  (consisting  of a pro rata  portion of each item of income and
gain for such year) in an amount and manner sufficient to offset such deficit as
quickly as possible.

         SECTION 7.5 Interim Distributions.  Except as otherwise provided in and
subject to subsection  (b) of this Section,  to the extent of the Available Cash
the  Board  of  Managers  may,  and in the case of  clauses  (a) and (b) of this
Section 7.4 shall, authorize the following  distributions of Company Property to
the Members on a per Unit basis:

                                      -20-
<PAGE>

         (a) Within a reasonable  time after the end of each Taxable  Year,  the
Company shall distribute to each Member, without regard to class or series, cash
in an amount  intended to provide each such Member with funds for the payment of
federal income taxes resulting from the allocations made pursuant to Article VII
to such Member for such Taxable Year;  provided,  however, any cash distribution
to be paid to any Member  pursuant to this clause may, at the  discretion of the
Board,  be reduced by the amount of any cash  distributions  paid to such Member
during or in respect of such  Taxable  Year  pursuant to this  Section 7.5 other
than pursuant to this  subsection (a). Any  distributions  paid pursuant to this
clause  shall be based  upon a  notional  tax rate  determined  by the Board and
applied  to all such  profit  allocations  regardless  of the tax  status of the
individual  Members,  and any such  distributions  may, at the discretion of the
Board,  be taken into account for purposes of this Section when  determining the
amount of undistributed Preferred Allocations.

         (b) Within a reasonable  time after the end of each Taxable  Year,  the
Company  shall  distribute  to each  Series B Preferred  Member,  Money or other
Property  in an  amount  up  to  all  accumulated  and  undistributed  Preferred
Allocations.

         (c)  Provided  that Money or other  Property in an amount  equal to all
accumulated and undistributed  Preferred Allocations has been distributed to the
Series B Preferred Members,  the Company may distribute to each Member (on a per
Unit basis,  without regard to class or series),  such  additional Cash or other
Property as the Board determines in its sole discretion.

                              ARTICLE VIII - TAXES

         SECTION 8.1  Elections.  The Board of Managers may, in its  discretion,
make or refrain from making any tax elections for the Company  allowed under the
Code or the tax laws of any state or other  jurisdiction that it deems necessary
or advisable,  including,  without limitation, any election under Section 754 of
the Code or any successor provision.

         SECTION 8.2 Taxes of Taxing Jurisdictions.  To the extent that the laws
of any Taxing  Jurisdiction  requires,  the Company may withhold and pay over to
such Taxing  Jurisdiction the amount of any tax, penalty or interest required to
be withheld and paid over under such laws with respect to items of income,  gain
and any other amounts allocable to any Member hereunder. Any such payments shall
be treated as a distribution for purposes of Article VII.

         SECTION 8.3 Tax Matters Partner. IMG Technology, L.L.C. Technology, LLC
is hereby  designated  as the "tax matters  partner" of the Company  pursuant to
Section  6231(a)(7) of the Code.  The Board of Managers  may, in its  discretion
from time to time,  designate  any other  Member as the "Tax  Matters  Partner",
provided  such  Member  agrees to such  designation.  The Board of  Managers  is
specifically  directed and authorized to take whatever steps it deems  necessary
or desirable to perfect each such  designation.  The Tax Matters  Partner  shall
take such  action as many be  necessary  to cause each other  Member to become a
notice partner within the meaning of Section 6223 of the Code. Any Member who is
designated tax matters partner may not take any action  contemplated by Sections
6222  through  6232 of the Code  without the  consent of the Board of  Managers.
Expenses  incurred by the Tax Matters Partner,  in its capacity as such, will be
borne by the Company.

                                      -21-
<PAGE>

         SECTION 8.4 Method of  Accounting.  The records of the Company shall be
maintained on the accrual method of accounting.

         SECTION 8.5 Company Tax Returns.  The Board of Managers  shall cause to
be  prepared  and  timely  filed all tax  returns  required  to be filed for the
Company.

         SECTION 8.6 Tax Reports.  The Board of Managers  shall,  as promptly as
practicable  and in any event  within 90 days after the end of each fiscal year,
cause to be prepared and mailed to each Member of record federal income tax form
K-1 and any other forms which are necessary or advisable.

         SECTION 8.7 Taxation as  Partnership.  The Members  recognize  that the
Company will be treated as a partnership  for U.S.  federal income tax purposes,
and the Board of  Managers  shall  operate  the Company in such a manner as will
preserve its treatment as a partnership for U.S. federal income tax purposes.

                      ARTICLE IX - DISPOSITION OF INTERESTS

         SECTION  9.1  Dispositions.  (a) No Member  may  dispose  of all or any
portion  of  that  Member's  Interest  unless  such  Disposition  complies  with
subsection (b) of this Section and unless:

         (i) such disposition,  alone or when combined with other  transactions,
would not result in a termination  of the Company  within the meaning of Section
708 of the Code;

         (ii)  the  Company  upon   request   receives  an  opinion  of  counsel
satisfactory  to the Board of Managers  that such  disposition  is subject to an
effective  registration under, or exempt from the registration  requirements of,
the applicable state and federal securities laws;

         (iii) the Company  receives  from the  transferee  of such Interest the
information  and agreements  that the Board of Managers may reasonably  require,
including  but  not  limited  to any  taxpayer  identification  number  and  any
agreement that may be required by any Taxing Jurisdiction; and

         (iv) to the extent such  Disposition is of Common Units issued pursuant
to the Plan,  two years have elapsed since the date of grant of such Units under
the Plan, unless such Disposition is a gift or bequest for no consideration.

         (b) Subject to the  requirements  set forth in  subsection  (a) of this
Section,  a Member may not Dispose of all or any portion of that Member's  Units
except to an Affiliate of such Member,  unless such  Disposition is consented to
by Members  holding of record not less than  two-thirds of the then  outstanding
Units (not taking into  account the Units to be disposed of or any Common  Units
issued pursuant to the Plan), subject to the following exceptions:


                                      -22-
<PAGE>

         (i)  Series B  Preferred  Units:  Until  such time as there  shall be a
Qualified  Offering,  (x) a Disposition by a holder of a Series B Preferred Unit
(or, if  converted  into Common  Unit,  such Common  Unit) shall be subject to a
right of first refusal by the Company pursuant to Section 9.1(b)(iii), and (y) a
holder of a Series B Unit shall have a right of co-sale with respect to sales of
Units by holders of Series A Units.

         (ii) Series A Preferred Units:  Coulter Corporation and IMG Technology,
L.L.C.  shall have a right of first refusal on the Units held by the other party
pursuant to Section 9.1(b)(iii),  which rights shall not expire upon a Qualified
Offering;  provided, however, that up to 20% of each party's Preferred Units (or
upon  conversion,  Common  Units)  (in the  aggregate)  may be  sold,  assigned,
transferred or otherwise conveyed by each party without restriction.

         (iii) Right of First  Refusal.  (a) The right of first  refusal in this
Section  9.1(b)(iii)  shall be solely for the  benefit of the  Company,  Coulter
Corporation  and IMG Technology,  L.L.C.;  (b) subject to the  restrictions  set
forth in this  Section 9.1 if any of the Coulter  Corporation,  IMG  Technology,
L.L.C.  or a holder of Series B Preferred  Units  wishes to transfer  any of its
Units (such person or entity  wishing to transfer its Units being the  "Offering
Unitholder")  to any person or entity  other than a Permitted  Transferee  (such
non-Permitted  Transferee being hereafter referred to as a "Third Party"),  such
Offering  Unitholder  shall deliver a written notice (an "Offer  Notice") to the
Company,  (in case the  Offering  Unitholder  is a holder of Series B  Preferred
Units),  or to  Coulter  Corporation  or IMG  Technology,  L.L.C.,  (in case the
Offering  Holder  is,  respectively,  IMG  Technology,  L.L.C.  or  the  Coulter
Corporation),  (the  "Remaining  Holder").  The Offer  Notice  will  describe in
reasonable  detail  the  number  of Units  being  offered,  the  purchase  price
requested and all other material terms and conditions of the proposed transfer.

         For purposes of this Section 9.1, a Permitted Transferee shall mean, to
the  extent a  transferee  agrees to be bound by  Section  9.1  hereof,  (a) any
subscriber  to  the  Operating   Agreement  (a  "Holder"),   (b)  the  guardian,
conservator,  heir or estate of any Holder, (c) any corporation,  partnership or
limited liability company all of the outstanding  securities and other interests
of which  are owned by a  Holder,  Holders  and/or  one or more  members  of the
immediate family of one or more Holders, (d) any individuals or corporations who
own  directly  or  indirectly,  all  of the  outstanding  securities  and  other
interests  of a  Holder  or the  guardian,  conservator  or  estate  of any such
individuals as of the date hereof;  (e) any trust,  all of the  beneficiaries of
which  are a Holder  or  members  of his  immediate  family,  (f) any  affiliate
controlled  by,  or under  common  control  with,  a Holder or  members  of such
Holder's immediate family, or (g) an immediate member of such Holder's family.

         (b) Upon  receipt of an Offer Notice from an Offering  Unitholder,  the
Remaining  Holder shall have the option to purchase  all, but not less than all,
of the Units being  offered by giving  written  notice  within ten business days
after  receipt  of the Offer  Notice.  The  Remaining  Holder  shall  notify the
Offering  Unitholder  and the Seller  whether it desires to  purchase  the Units
being offered,  and shall  consummate such purchase within 30 days after receipt
of the Offer Notice.


                                      -23-
<PAGE>

         (c) If the  Remaining  Holder  does not  elect to  purchase  all of the
Units,  or the  purchase  of the Units is not  consummated  within 30 days after
receipt of the Offer Notice,  then the Offering Unitholder shall be free to sell
the  Units  to any  third  party  on terms  no less  favorable  to the  Offering
Unitholder.

         SECTION 9.2 Rights of Transferees.  Until such time (if at all) as such
person  becomes a Member in  accordance  with  Article X, an  assignee  or other
transferee of an Interest shall have no rights  hereunder or with respect to the
business and affairs of the Company or to become a Member.

         SECTION 9.3  Dispositions  not in Compliance  Void. Any  Disposition or
attempted  Disposition  of an Interest,  or any part thereof,  not in compliance
with this Article shall be, and is declared to be, null and void ab initio.

                       ARTICLE X - ADMISSION OF SUBSTITUTE
                             AND ADDITIONAL MEMBERS

         SECTION 10.1 Admission of Substitute Members.  (a) An assignee or other
transferee  of all  or  any  portion  of an  Interest  shall  be  admitted  as a
Substitute  Member  and  shall  have  all  the  rights,  and  assume  all of the
obligations,  with  respect  to such  Interest  (including  all the  rights  and
obligations of the Member who assigned such Interest with respect  thereto) only
(i) if such  transfer  complies in all  respects  with  Section  9.1,  (ii) upon
compliance with the procedures for admission contained in Section 10.3 and (iii)
upon  receipt  by  the  Company  of  written   authorization   from  the  Member
transferring  such  Interest  (with  an  appropriate  signature  guarantee,   if
requested by the Company).

         (b) The  admission of a Substitute  Member shall not release the Member
who disposed of such Interest (or any part thereof),  nor release any subsequent
transferee  of such  Interest,  from any  liability to the Company in respect of
such Interest that may have existed prior to such admission.

         SECTION 10.2 Admission of Additional Members. Subject to Article V, the
Board of Managers  shall have the authority to admit  Additional  Members and to
determine the capital  contributions of such Members and to issue such Interests
in such  classes or series and in such  number of Units as the Board of Managers
shall deem necessary or advisable.

         SECTION 10.3 Procedure for  Admission.  (a) No Person shall be admitted
as a  Substitute  Member or  Additional  Member  until (i) such  Person  and the
Company execute an agreement (an "Admission  Agreement") whereby such Person (A)
agrees to the terms and conditions of this  Agreement,  as such agreement may be
amended from time to time in  accordance  herewith,  and to such other terms and
conditions  as the  Board  shall  reasonably  require  in  connection  with such
admission  (provided  such  other  terms  and  conditions  are not  inconsistent
herewith),  and (B) in the case of an  Additional  Member,  agrees  to make such
capital  contribution  as the Board of Managers shall  determine and (ii) in the
case of an  Additional  Member,  such Person has made the  capital  contribution
required to be made pursuant to such Admission Agreement.

                                      -24-
<PAGE>

         (b) The Company will reflect the admission of a Member pursuant to this
Article in the records of the Company as soon as is reasonably practicable after
satisfaction of the conditions set forth in this Article and the conditions,  if
any, set forth in the Admission Agreement to which such Person is a party.

         (c) For purposes of this Agreement,  no person shall be deemed a Member
until  such time as such  person is  reflected  as a Member  on  records  of the
Company as provided for in subsection (b) of this Section.

                      ARTICLE XI - DISSOCIATION OF A MEMBER

         SECTION 11.1  Dissociation.  (a)  A  Person  shall cease to be a Member
upon the happening of any of the following events:

         (i)      the Disposition by a Member of his entire Interest;

         (ii)     the Member becoming a Bankrupt Member;

         (iii) in the case of a Member who is a natural person, the death of the
Member  or  the  entry  of  an  order  by  a  court  of  competent  jurisdiction
adjudicating the Member incompetent to manage such Member's estate;

         (iv) in the case of a Member that is a trust,  the  termination  of the
trust (but not merely the substitution of a new trustee);

         (v) in the case of a Member that is an  Organization,  the dissolution,
winding-up, liquidation or merger of such Organization; or

         (vi) in the case of a Member that is an estate, the distribution by the
fiduciary of the estate of its entire Interest in the Company.

         (b) Each  Dissociated  Member  shall  promptly  notify  the  Company in
writing of the date and the relevant facts surrounding his or its Dissociation.

         SECTION 11.2 Effect of Certain Dissociations.  Upon the Dissociation of
a Member other than  pursuant to Section  11.1(a)(i),  and if the Company is not
thereby  dissolved  as  provided  in Section  12.1(c)  the  transferee  or other
successor in interest to the  Dissociated  Members  Interest  may, to the extent
(and  only to the  extent)  required  by  Section  18-604 of the  Delaware  Act,
exercise  all  of  such  Dissociated   Member's  rights  hereunder  as  if  such
Dissociated Member has not Dissociated and, upon compliance with Article X, such
person shall be admitted as a Member.

         SECTION 11.3  Damages.  The provision set forth herein shall not effect
any claim for damages the Company  may have  against the  Dissociated  Member if
such Dissociation is in violation of this Agreement.  The Company shall have the
right to offset any payments due under this


                                      -25-
<PAGE>

Agreement in respect of a Dissociated  Member's Interest (whether payable to the
Dissociated Member or any successor in interest) by any damages that the Company
may incur as a result of the  Dissociation  of such Member in  contravention  of
this Agreement.


                    ARTICLE XII - DISSOLUTION AND WINDING-UP

         SECTION  12.1  Dissolution.  The  Company  shall be  dissolved  and its
affairs wound up, upon the first to occur of the following events:

         (a)      the expiration of the Term;

         (b)      the written consent of all of the Members;

         (c) the entry of a decree of judicial  dissolution of the Company under
the Section 18-702 of the Delaware Act (or any successor provision).

         SECTION  12.2  Notice  of  Dissolution.  Upon  the  dissolution  of the
Company, the Company shall promptly notify the Members of such dissolution.

         SECTION  12.3   Distribution   of  Proceeds  Upon   Dissolution.   Upon
dissolution of the Company,  the Board of Managers shall immediately commence to
wind-up the Company's affairs;  provided,  however, that a reasonable time shall
be allowed  for the  orderly  liquidation  of the assets of the  Company and the
satisfaction of liabilities to creditors so as to enable the Members to minimize
the normal losses  attendant  upon a liquidation.  The proceeds of  liquidation,
after adequate  provision has been made for the  satisfaction of all liabilities
of the Company  (other than  liabilities  to Members in their capacity as such),
shall be distributed, to the Members, as realized:

         (a)  First,  to the  holders of the Series B  Preferred  Interests,  an
amount  equal to the Series B Preferred  Interests  respective  Initial  Capital
Contributions plus undistributed Preferred Allocations,  if any (but in no event
in an amount in excess of a holder's Capital Account).

         (b)  Second,  to the holders of the Series A  Preferred  Interests,  an
amount  equal to the Series A Preferred  Interests  respective  Initial  Capital
Contributions  (but in no event in an amount in  excess  of a  holder's  Capital
Account).

         (c) Third,  to the  holders of the Series A  Preferred  Interests,  the
Series B Preferred  Interests and the Common Interests,  pro rata, in accordance
with and to the extent of their remaining respective Capital Accounts.

         (d) Last,  to the  holders of the  Series A  Preferred  Interests,  the
Series B  Preferred  Interests  and the  Common  Interests,  on a per Unit basis
without regard to class or series.


                                      -26-
<PAGE>

         SECTION  12.4  Termination.  The  winding-up  of the  Company  shall be
completed and the Company shall terminate when (i) all debts,  liabilities,  and
obligations of the Company have been paid and discharged or reasonably  adequate
provision  therefor has been made, (ii) all of the remaining property and assets
of the Company  have been  distributed  to the Members in  accordance  with this
Article,  and (iii) a  certificate  of  dissolution  shall be  delivered  to the
Secretary  of State of the  State of  Delaware  in the  manner  required  by the
Delaware Act.

                     ARTICLE XIII - MISCELLANEOUS PROVISIONS

         SECTION 13.1 Conversion to a Corporation. Upon approval by the Board of
Managers  and the Series A  Preferred  Interests  pursuant to Section  5.3,  the
Company shall convert from a limited  liability  company to a corporation.  Such
conversion  may be  effected  by a  contribution  by the  Members  of all of the
Interests in the Company to a newly-formed corporation in exchange for shares of
such corporation, by merger with or into a corporation solely for the purpose of
converting the Company from a limited liability company to a corporation,  or by
some  other  means.  Each class or series of  interests  shall be  converted  or
exchanged  into a class or series  of  equity  securities  of the  resulting  or
surviving  entity on a per Unit basis. Any and all Preferred  Allocations  shall
not be taken into account in the conversion to a corporation.

         SECTION 13.2 Amendment.  Except as otherwise provided in this Agreement
or any  Designation  of any class or series of Interest,  this  Agreement may be
amended or modified  from time to time only by a written  instrument  adopted by
Members  holding  of  record a  majority  of the  outstanding  Units;  provided,
however,  (x) the  amendment  of any  provision  of this  Agreement  increasing,
decreasing or changing the manner of calculating any required vote or consent of
the  Members or which  relate to sale rights and rights of first  refusal  shall
require  the  affirmative  vote or consent of 51% of the holders of the Series A
Preferred  Units  and  51% of  the  holders  of the  Series  B  Preferred  Units
immediately prior to any such amendment, (y) without the written consent of each
Member adversely affected thereby (the "Affected Member"),  no amendment of this
Agreement  (including  an  amendment  establishing  a new  series  of  Preferred
Interests  pursuant to Article 5) shall be made that (i)  requires  the Affected
Member to make any  additional  contribution  to the  Company,  (ii)  alters the
method of  allocating  to the  Affected  Member  for tax  purposes  any items of
income, gain, loss, deduction or credit, or (iii) alters the manner of computing
the distributions of Company Property to the Affected Member hereunder;  and (z)
any  amendment  to this  Agreement  that would  cause the  Company to fail to be
treated as a  partnership  for federal  income tax  purposes  shall  require the
consent of all the Members.

         SECTION  13.3 Entire  Agreement.  This  Agreement  contains  the entire
agreement  among the  parties  with  respect to the  subject  matter  hereof and
supersedes  all prior  written oral  agreements,  and all  contemporaneous  oral
agreements, relating to such matters.

         SECTION 13.4  Indemnification.  (a)  To the fullest extent permitted by
the Delaware Act, a director of the Company  shall not be  personally  liable to
the  Company  or the  Members  for  monetary  damages  for  breach  of duty as a
director. Without limiting the foregoing in any respect,


                                      -27-
<PAGE>

a director of the Company shall not be  personally  liable to the Company or the
Members  for  monetary  damages  for  breach of duty as a  director,  except for
liability (i) for any breach of the director's duty of loyalty to the Company or
the  Members,  (ii) for acts or  omissions  not in good  faith or which  involve
intentional  misconduct  or a  knowing  violation  of  law,  or  (iii)  for  any
transaction from which the director derived an improper personal benefit. If the
Delaware Act is amended to further eliminate or limit the personal  liability of
directors,  then the  liability of a director of the Company shall be eliminated
or limited to the fullest  extent  permitted by the Delaware Act, as so amended.
Any repeal or modification of this Section shall not adversely  affect any right
or protection  of a director of the Company  existing at the time of such repeal
or modification.

         (b) (i)  Right to  Indemnification.  Each  person  who was or is made a
party or is threatened to be made a party to or is involved in any Proceeding by
reason  of the fact  that he or she,  or a person of whom he or she is the legal
representative,  is or was a director  or  officer  of the  Company or is or was
serving at the request of the Company as a director,  manager, officer, employee
or agent of another limited liability  company,  or a corporation,  partnership,
joint venture, trust or other enterprise (whether such request is made before or
after  the acts  taken or  allegedly  taken or  events  occurring  or  allegedly
occurring which give rise to such Proceeding), including service with respect to
employee  benefit plans,  whether the basis of such proceeding is alleged action
in an official capacity as a director, manager, officer, employee or agent or in
any other capacity while serving as a director,  manager,  officer,  employee or
agent,  shall be  indemnified  and held  harmless  by the Company to the fullest
extent  authorized  by the Delaware  Act, as the same exists or may hereafter be
amended  (but,  in case of any  such  amendment,  only to the  extent~that  such
amendment  permits the Company to provide  broader  indemnification  rights than
said law permitted the Company to provide prior to such amendment),  against all
expense, liability and loss (including attorneys' fees, judgments,  fines, ERISA
excise  taxes  or  penalties  and  amounts  paid or to be  paid  in  settlement)
reasonably incurred or suffered by such person in connection  therewith and such
indemnification  shall  continue as to a person who has ceased to be a director,
officer,  employee or agent of the Company and shall inure to the benefit of his
or her heirs,  executors and administrators;  provided,  however, that except as
provided in subsection (b) (ii) of this Section, the Company shall indemnify any
such person seeking  indemnification  pursuant to this  subsection in connection
with a  Proceeding  (or part  thereof)  initiated  by such  person  only if such
Proceeding  (or part  thereof)  was  authorized  by the  Board.  In the  event a
director or officer of the Company shall serve as a director,  manager, officer,
employee or agent of any limited liability  company,  corporation,  partnership,
joint  venture,  trust or other  enterprise  in which the Company  maintains  an
investment it shall be conclusively presumed for purposes of the indemnification
provided for herein that such service has been  undertaken at the request of the
Company.  The  foregoing  presumption  shall apply  regardless  of whether  such
director  or officer is serving  such  entity at the request of a third party or
that  his  or  her  service  with  such  entity  was  commenced   prior  to  the
effectiveness  of this  Section  or prior to his or her  becoming  an officer or
director of the Company. The right to indemnification  conferred herein shall be
a contract  right based upon an offer from the Company  which shall be deemed to
be  accepted  by such  person's  service or  continued  service as a director or
officer of the Company for any period after the offer is made and shall  include
the right to be paid by the Company the expenses  incurred in defending any such
proceeding in advance of its final disposition;  provided, however, that, if the
Delaware Act requires,  the payment of such  expenses  incurred by a director or
officer in


                                      -28-
<PAGE>

his or her capacity as a director or officer  (and not in any other  capacity in
which  service was or is  rendered  by such person  while a director or officer,
including,  without limitation,  service to an employee benefit plan) in advance
of the final  disposition  of a Proceeding,  shall be made only upon delivery to
the Company of an undertaking,  by or on behalf of such director or officer,  to
repay all amounts so advanced if it shall  ultimately  be  determined  that such
director or officer is not  entitled  to be  indemnified  under this  Section or
otherwise.  The Company may, by action of the Board, provide  indemnification to
employees  or  agents  of the  Company  with the same  scope  and  effect as the
foregoing indemnification of directors and officers.

         (ii) Right of  Claimant  to Bring  Suit.  If a claim  under  subsection
(b)(i) of this  Section is not paid in full by the  Company  within  thirty days
after a written claim has been received by the Company,  the claimant may at any
time  thereafter  bring suit against the Company to recover the unpaid amount of
the claim and, if successful in whole or in part, the claimant shall be entitled
to be paid also the expense of prosecuting  such claim. It shall be a defense to
any such action  (other than an action  brought to enforce a claim for  expenses
incurred in defending any Proceeding in advance of its final  disposition  where
the required undertaking,  if any is required, has been tendered to the Company)
that the claimant has not met the standards of conduct which make it permissible
under the Delaware Act for the Company to indemnify  the claimant for the amount
claimed, but the burden of proving such defense shall be on the Company. Neither
the failure of the Company (including the Board,  independent legal counsel,  or
its  Members) to have made a  determination  prior to the  commencement  of such
action  that  indemnification  of the  claimant  is proper in the  circumstances
because he or she has met the  applicable  standard  of conduct set forth in the
Delaware Act, nor an actual  determination by the Company  (including the Board,
independent  legal  counsel,  or its members) that the claimant has not met such
applicable  standard  of  conduct,  shall be a defense to the action or create a
presumption that the claimant has not met the applicable standard of conduct.

         (iii)  Nonexclusivity of Rights. The right to  indemnification  and the
payment of expenses  incurred in defending a Proceeding  in advance of its final
disposition  conferred in this Section shall not be exclusive of any right which
any person may have or hereafter  acquire  under any statute,  provision of this
Agreement,  the By-Laws, any other agreement with the Company, vote of the Board
or the Members or disinterested directors or otherwise.

         (iv) Insurance.  The Company may maintain insurance, at its expense, to
protect  itself and any director,  officer,  employee or agent of the Company or
another limited  liability  company,  corporation,  partnership,  joint venture,
trust or other enterprise  against any such expense,  liability or loss, whether
or not the Company  would have the power to indemnify  such person  against such
expense, liability or loss under the Delaware Act or this Agreement.

         (v) Severability.  If any subsection of this Section shall be deemed to
be invalid or ineffective in any Proceedings,  the remaining  subsections hereof
shall not be affected and shall remain in full force and effect.


                                      -29-
<PAGE>

         SECTION 13.5  Successors'  Counterparts.  This  Agreement  (a) shall be
binding  as  to  the  executors,   administrators,   estates,  heirs  and  legal
successors,  or  nominees  or  representatives,  of the  Members  and (b) may be
executed  in  several  counterparts  with  the  same  effect  as if the  parties
executing the several  counterpart had all executed one  counterpart.  Except to
the extent expressly provided herein, no Person other than the Members and their
respective executors,  administrators,  estates, heirs and legal successors,  or
their  nominees or  representatives,  shall  obtain any rights by virtue of this
Agreement.

         SECTION 13.6  Governing  Law.  This  Agreement  shall be governed by in
construed in accordance  with the laws of the State of Delaware  without  giving
effect to the principles of conflict of laws thereof.

         SECTION 13.7  Filings.  Following  the  execution  and delivery of this
Agreement,  the  Board  of  Managers  shall  promptly  prepare,  or  cause to be
prepared,  any  documents  required to be filed and recorded  under the Delaware
Act, and the Board of Managers  shall  promptly  cause each such  document to be
filed and  recorded  in  accordance  with the  Delaware  Act and,  to the extent
required  by local  law,  to be filed  and  recorded  or  notice  thereof  to be
published in the appropriate place in each jurisdiction in which the Company may
hereafter  establish  a place of  business.  The Board of  Managers  shall  also
promptly  cause to be filed,  recorded and  published  such  statements or other
instruments required by any provision of any applicable law of the United States
or any state or other  jurisdiction  which  governs the conduct of its  business
from time to time.

         SECTION 13.8 Power of Attorney.  (a) Each Member does hereby constitute
and appoint the Chairman of the Board or the  Co-Chairmen  of the Board,  as the
case may be, the  President,  and the  Secretary of the Company,  separately  or
jointly, with full power of substitution,  as its true and lawful representative
and attorney-in-fact,  each in its name, place and stead to make, execute, sign,
deliver and file (i) any  amendment of the  Certificate  required  because of an
amendment  to this  Agreement  or in  order  to  effectuate  any  change  in the
membership  of the  Company,  (ii)  any  amendment  to  this  Agreement  made in
accordance  with  the  terms  hereof,  and  (iii)  all such  other  instruments,
documents and  certificates  which may from time to time be required by the laws
of  the  United  States  of  America,   the  State  of  Delaware  or  any  other
jurisdiction,  or any political  subdivision of agency  thereof,  to effectuate,
implement and continue the valid and  subsisting  existence of the Company or to
dissolve the Company or for any other purpose consistent with this Agreement and
the transactions contemplated hereby.

         (b) The power of attorney  granted  hereby is coupled  with an interest
and shall (i) survive and not be affected by the subsequent  death,  incapacity,
disability,  dissolution,  termination or bankruptcy of the Member  granting the
same or the  transfer of all or any portion of such  Member's  Interest and (ii)
extend to such Members successors, assigns and legal representatives.

         SECTION 13.9 Additional Documents. Each Member, upon the request of the
Board of Managers,  agrees to perform all further acts and execute,  acknowledge
and deliver any  documents  that may be  reasonably  necessary  to carry out the
provisions of this Agreement.


                                      -30-
<PAGE>

         SECTION 13.10 Notices. All notices provided for in this Agreement shall
be in  writing,  duly  signed  by the party  giving  such  notice,  and shall be
delivered, telecopied or mailed by registered or certified mail, as follows:

         (a) If given to the Company, in care of the President of the Company at
the Company's mailing address set forth below:

                  300 American Road
                  Morris Plains, NJ  07950
                  Attn:  President

         (b) If given to any  Member,  at the  address  thereof set forth on the
registration books maintained by or on behalf of the Company.

         Each such notice, request or other communication shall be effective (i)
if given  by  telecopier,  when  transmitted  to the  number  specified  in such
registration  books and  confirmation  of receipt is received,  (ii) if given by
mail, 3 business  days after such  communication  is deposited in the mails with
first class postage  prepaid,  addressed as aforesaid,  or (iii) if given by any
other means, when delivered at the address specified in such registration books.

         SECTION 13.11 No Partnership Intended for Nontax Purposes.  The Members
have formed the Company  under the  Delaware  Act,  and  expressly do not intend
hereby to form a partnership  under either the Delaware Uniform  Partnership Act
or the Delaware Uniform Limited Partnership Act. The Members do not intend to be
partners one to another,  or partners as to any third  party.  To the extent any
Member, by word or action, represents to another person that any other Member is
a partner or that the Company is a partnership,  the Member making such wrongful
representation  shall,  notwithstanding any exculpatory  provision herein to the
contrary,  be liable to any other Member who incurs personal liability by reason
of such wrongful representation.

         SECTION 13.12 Rights of Creditors and Third Parties.  This Agreement is
entered into among the Members for the  exclusive  benefit of the  Company,  its
Members,  and their  successors and  assignees.  This Agreement is expressly not
intended  for the benefit of any  creditor  of the Company or any other  Person.
Except and only to the extent provided by applicable  statute,  no such creditor
or third  party  shall  have any  rights  under this  Agreement,  any  Admission
Agreement or any other agreement between the Company and any Member with respect
to any capital contribution to the Company or otherwise.

         SECTION  13.13  Headings.  The table of contents  and  headings in this
Agreement  are included for  convenience  and  reference  only and are in no way
intended to describe,  interpret, define or limit the scope, extent or intent of
this Agreement or any provision hereof.

         SECTION 13.14 Gender and Number.  Words used herein,  regardless of the
number  and gender  used,  shall be deemed and  construed  to include  any other
number, singular or plural, and any


                                      -31-
<PAGE>

other gender,  masculine,  feminine or neuter, as the context requires,  and, as
used herein, unless the context clearly requires otherwise, the words "hereof n,
"herein"  and  "hereunder"  and  words  of  similar  import-shall  refer to this
Agreement as a whole and not to any particular provisions hereof.  References to
Section and Article numbers herein shall, unless otherwise  indicated,  refer to
Sections and Articles of this Agreement.

         SECTION  13.15  No  Waiver.  The  failure  or  delay on the part of any
Member,  the Company or the Board of Managers in exercising  any right or remedy
under this Agreement,  or any other agreement between the parties, or otherwise,
will not operate as a waiver thereof. The express waiver by any such Person of a
breach of any provision of this  Agreement by any other Person shall not operate
or be construed as a waiver of any subsequent  breach by said Person.  No waiver
will be  effective  unless  and until it is in  written  form and  signed by the
waiving party.


         IN  WITNESS  WHEREOF,   the  parties  below  have  duly  executed  this
Agreement.


                                      -32-
<PAGE>

                                SIGNATURE PAGE TO
                               OPERATING AGREEMENT
                                       OF
                            IBC PHARMACEUTICALS, LLC


     The undersigned,  desiring to become a Member and a holder of Common Units,
Series A  Preferred  Units,  Series B Preferred  Units  and/or Plan Units of IBC
Pharmaceuticals,  LLC (the  "Company"),  and to become a party to the  Operating
Agreement  of the Company  dated as of March __, 1999 as such  agreement  may be
amended from time to time (this "Agreement"),  hereby agrees to all of the terms
and conditions of, and to be bound by, the Agreement.

     IN WITNESS WHEREOF,  this  counterpart  signature page has been executed by
the undersigned on this day of , 1999.





                                                     By:
                                                        Name:
                                                        Title:



                                      -33-
<PAGE>



                                                                       EXHIBIT A


<TABLE>

                          Initial Members/Contributions
                                (See Section 6.1)

<CAPTION>

Initial Members                           Contribution         Value of Contribution            Units Issued
- ---------------                           ------------         ---------------------            ------------
<S>                                        <C>                 <C>                     <C>                   <C>
                                                                                       Series A              Series B
                                                                                       Preferred             Preferred
IMG Technology, L.L.C.                     technology          $18,647,020             3,729,404 Units
Coulter Corporation                        technology and      $16,351,135             3,270,227 Units
                                           cash
Ira and Harriet Goldenberg, JTWROS         cash                $    15,000                                      3,000 Units
Richard Brosnahan                          cash                $    25,000                                      5,000 Units
Lee R. Goldenberg Trust                    cash                $   242,585                                     48,517 Units
LGC Investment II, L.P.                    cash                $   500,000                                    100,000 Units
EAC Investment II L.P.                     cash                $ 1,000,000                                    200,000 Units
Larry L. & Betty L. Koontz, JTWROS         cash                $    50,000                                     10,000 Units
Michael L. Brochu Revocable Trust          cash                $   250,000                                     50,000 Units
Laurence S. & Linda J. Wilson, JTWROS      cash                $   100,000                                     20,000 Units
Neil A. Goldenberg                         cash                $   242,585                                     48,517 Units
MSC Investment II, L.P.                    cash                $   500,000                                    100,000 Units
Claudette T. Amoroso                       cash                $    25,000                                      5,000 Units
Judith Levinson                            cash                $    25,000                                      5,000 Units
Robert Grenitz, M.D.                       cash                $    25,000                                      5,000 Units

</TABLE>


                                      -34-
<PAGE>

                                                                       EXHIBIT B


                                Current Managers


         The Board of Managers  of the Company as of the date of this  Agreement
consists of the persons  listed below and such persons shall serve on such Board
until their  resignation  or removal or until their  successors  shall have been
elected and shall have qualified in accordance with this Agreement:

         1.       Michael L. Brochu (Acting CEO)

         2.       David Goldenberg (Chairman)

         3.       Jacques Barbet (COO)

         4.       Edgar Vivanco

         5.       Richard Williams (CFO)



                                      -35-
<PAGE>



                               Operating Agreement

                                       of

                            IBC Pharmaceuticals, LLC

                     (a Delaware Limited Liability Company)



                               As of March 5, 1999


<PAGE>

                                TABLE OF CONTENTS


ARTICLE I - FORMATION; BUSINESS................................................1
         SECTION 1.1       Organization; Business..............................1
         SECTION 1.2       Management of the Company...........................1
         SECTION 1.3       Agreement; Inconsistencies with Delaware Act;
                           Reliance on this Agreement..........................1
         SECTION 1.4       Name................................................2
         SECTION 1.5       Effective Date......................................2
         SECTION 1.6       Term................................................2
         SECTION 1.7       Registered Agent and Office.........................2
         SECTION 1.8       Principal Office....................................2
         SECTION 1.9       Qualification in Other Jurisdictions................2

ARTICLE II - DEFINITIONS.......................................................3
         SECTION 2.1       Additional Member...................................3
         SECTION 2.3       Adjusted Capital Contributions .....................3
         SECTION 2.4       Admission Agreement.................................3
         SECTION 2.5       Affected Member ....................................3
         SECTION 2.6       Affiliate...........................................3
         SECTION 2.7       Agreement...........................................3
         SECTION 2.8       Available Cash .....................................3
         SECTION 2.9       Bankrupt Member.....................................3
         SECTION 2.10      Board of Managers or Board..........................4
         SECTION 2.11      Book Adjustments....................................4
         SECTION 2.12      Book Value..........................................4
         SECTION 2.13      Business Day........................................4
         SECTION 2.14      Capital Account.....................................4
         SECTION 2.15      Capital Account Ratio...............................4
         SECTION 2.17      Certificate ........................................4
         SECTION 2.18      Code................................................4
         SECTION 2.19      Common Member.......................................5
         SECTION 2.20      Common Interest.....................................5
         SECTION 2.21      Common Units........................................5
         SECTION 2.22      Company.............................................5
         SECTION 2.23      Company Liability...................................5
         SECTION 2.24      Company Minimum Gain................................5
         SECTION 2.25      Company Nonrecourse Liability.......................5
         SECTION 2.26      Company Property....................................6
         SECTION 2.27      Conversion Adjustment...............................6
         SECTION 2.28      Current Members.....................................6
         SECTION 2.29      Delaware Act........................................6
         SECTION 2.30      Designation.........................................6

                                       -i-
<PAGE>

         SECTION 2.31      Director............................................6
         SECTION 2.32      Disposition (Dispose)...............................6
         SECTION 2.33      Dissociation........................................6
         SECTION 2.34      Dissociated Member..................................6
         SECTION 2.35      Effective Date......................................6
         SECTION 2.36      GAAP................................................6
         SECTION 2.38      Initial Members.....................................6
         SECTION 2.39      Interest............................................7
         SECTION 2.40      Majority in Interest................................7
         SECTION 2.41      Member..............................................7
         SECTION 2.42      Member Minimum Gain.................................7
         SECTION 2.43      Member Nonrecourse Liability........................7
         SECTION 2.44      Money...............................................7
         SECTION 2.45      Nonrecourse Liabilities.............................7
         SECTION 2.46      Organization........................................8
         SECTION 2.47      Person..............................................8
         SECTION 2.49      Preferred Allocation ...............................8
         SECTION 2.50      Principal Office ...................................8
         SECTION 2.51      Proceeding..........................................8
         SECTION 2.52      Profit or Loss......................................8
         SECTION 2.53      Property............................................9
         SECTION 2.54      Qualified Offering .................................9
         SECTION 2.55      Regulations ........................................9
         SECTION 2.56      Related Person......................................9
         SECTION 2.57      Revaluation.........................................9
         SECTION 2.58      Revaluation Date....................................9
         SECTION 2.59      Revaluation Event...................................9
         SECTION 2.60      Series A Preferred Interest........................10
         SECTION 2.61      Series B Preferred Interest........................10
         SECTION 2.62      Series A Preferred Member..........................10
         SECTION 2.63      Series B Preferred Member..........................10
         SECTION 2.64      Series A Preferred Units...........................10
         SECTION 2.65      Series B Preferred Units...........................10
         SECTION 2.66      Substitute Member..................................10
         SECTION 2.67      Taxable Year.......................................10
         SECTION 2.68      Taxing Jurisdiction................................10
         SECTION 2.69      Tax Matters Partner................................10
         SECTION 2.70      Term...............................................10
         SECTION 2.71      Units..............................................10

ARTICLE III - BOARD OF MANAGERS...............................................11
         SECTION 3.1       Powers of the Board................................11
         SECTION 3.2       Current Board Members..............................11

                                      -ii-
<PAGE>

         SECTION 3.3       Records to be Maintained...........................11
         SECTION 3.4       Reports to Members.................................11

ARTICLE IV - RIGHTS AND DUTIES OF MEMBERS.....................................12
         SECTION 4.1       General Rights.....................................12
         SECTION 4.2       No Right to Withdraw...............................12
         SECTION 4.3       Limited Liability of Members.......................12
         SECTION 4.4       Representations and Warranties.....................12

ARTICLE V - DESCRIPTION OF INTERESTS..........................................13
         SECTION 5.1       Classes and Series of Interests....................13
         SECTION 5.2       Common Units.......................................13
         SECTION 5.3       Series A Preferred Units...........................14
         SECTION 5.4       Series B Preferred Units...........................15
         SECTION 5.5       Other Units........................................15
         SECTION 5.6       Preferred Allocation...............................15
         SECTION 5.7       Voting.............................................16
         SECTION 5.8       Purchase of Interests by the Company...............16
         SECTION 5.9       Status of Unit Redeemed, Transferred or
                           Dissociated........................................16
         SECTION 5.10      Preemptive and Appraisal Rights....................16
         SECTION 5.11      Persons Deemed Members.............................17

ARTICLE VI - CONTRIBUTIONS AND CAPITAL ACCOUNTS...............................17
         SECTION 6.1       Initial Capital Contributions......................17
         SECTION 6.2       Maintenance of Capital Accounts....................17
         SECTION 6.3       Adjustments to Capital Accounts upon Distribution
                           of Assets..........................................18
         SECTION 6.4       Revaluation of Company Property....................18
         SECTION 6.5       Transfer of Capital Accounts.......................18
         SECTION 6.6       Compliance with Section 704(b) of the Code.........18

ARTICLE VII - ALLOCATIONS AND DISTRIBUTIONS...................................19
         SECTION 7.1       Allocations of Profit and Loss.....................19
         SECTION 7.2       Company Minimum Gain Chargeback....................20
         SECTION 7.3       Member Minimum Gain Chargeback.....................20
         SECTION 7.4       Qualified Income Offset............................20
         SECTION 7.5       Interim Distributions..............................20

ARTICLE VIII - TAXES..........................................................21
         SECTION 8.1       Elections..........................................21
         SECTION 8.2       Taxes of Taxing Jurisdictions......................21
         SECTION 8.3       Tax Matters Partner................................21
         SECTION 8.4       Method of Accounting...............................22
         SECTION 8.5       Company Tax Returns................................22
         SECTION 8.6       Tax Reports........................................22

199721.6
                                      -iii-
<PAGE>

         SECTION 8.7       Taxation as Partnership............................22

ARTICLE IX - DISPOSITION OF INTERESTS.........................................22
         SECTION 9.1       Dispositions.......................................22
                  (i)      Series B Preferred Units...........................23
                  (ii)     Series A Preferred Units...........................23
                  (iii)    Right of First Refusal.............................23
         SECTION 9.2       Rights of Transferees..............................24
         SECTION 9.3       Dispositions not in Compliance Void................24

ARTICLE X - ADMISSION OF SUBSTITUTE
         AND ADDITIONAL MEMBERS...............................................24
         SECTION 10.1      Admission of Substitute Members....................24
         SECTION 10.2      Admission of Additional Members....................24
         SECTION 10.3      Procedure for Admission............................24

ARTICLE XI - DISSOCIATION OF A MEMBER.........................................25
         SECTION 11.1      Dissociation.......................................25
         SECTION 11.2      Effect of Certain Dissociations....................25
         SECTION 11.3      Damages............................................25

ARTICLE XII - DISSOLUTION AND WINDING-UP......................................26
         SECTION 12.1      Dissolution........................................26
         SECTION 12.2      Notice of Dissolution..............................26
         SECTION 12.3      Distribution of Proceeds Upon Dissolution..........26
         SECTION 12.4      Termination........................................27

ARTICLE XIII - MISCELLANEOUS PROVISIONS.......................................27
         SECTION 13.1      Conversion to a Corporation........................27
         SECTION 13.3      Entire Agreement...................................27
         SECTION 13.4      Indemnification....................................27
                  (i)      Right to Indemnification...........................28
                           ------------------------
                  (ii)     Right of Claimant to Bring Suit....................29
                           -------------------------------
                  (iii)    Nonexclusivity of Rights...........................29
                           ------------------------
                  (iv)     Insurance..........................................29
                           ---------
                  (v)      Severability.......................................29
                           ------------
         SECTION 13.5      Successors' Counterparts...........................30
         SECTION 13.6      Governing Law......................................30
         SECTION 13.7      Filings............................................30
         SECTION 13.8      Power of Attorney..................................30
         SECTION 13.9      Additional Documents...............................30
         SECTION 13.10     Notices............................................31
         SECTION 13.11     No Partnership Intended for Nontax Purposes........31
         SECTION 13.12     Rights of Creditors and Third Parties..............31

                                      -iv-
<PAGE>


         SECTION 13.13     Headings...........................................31
         SECTION 13.14     Gender and Number..................................31
         SECTION 13.15     No Waiver..........................................32


EXHIBITS AND SCHEDULES

         Exhibit A - Initial Members
         Exhibit B - Current Managers

                                       -v-
<PAGE>

                                LICENSE AGREEMENT
         THIS LICENSE  AGREEMENT (the  "Agreement")  is effective as of March 5,
1999  (the  "Effective  Date"),   between   IMMUNOMEDICS,   INC.   (hereinafter,
Immunomedics"),  having its  principal  place of business at 300 American  Road,
Morris Plains, New Jersey 07950, and IBC  PHARMACEUTICALS,  L.L.C.  (hereinafter
"IBC"),  having its  principal  place of  business  at c/o David M.  Goldenberg,
Immunomedics, Inc., 300 American Road, Morris Plains, New Jersey 07950.

                                   WITNESSETH

         WHEREAS,  Immunomedics  owns or controls  certain  Immunomedics  Patent
Property  and  Immunomedics  Biotechnology  Assets  (as such  terms are  defined
below), relating to the production and use of CEA-specific monoclonal antibodies
(Mabs), and has access to technology for the production of other humanized Mabs,
and certain adjuvant treatment; and

         WHEREAS,  IBC has  expressed  an  interest  in  obtaining  a license or
sublicense  under  certain  Immunomedics  Patent  Property and the  Immunomedics
Biotechnology Assets, and obtaining certain services and Mabs from Immunomedics;
and

         WHEREAS,  Immunomedics  is a member of IMG Technology,  LLC ("IMG"),  a
Delaware limited liability company which in turn is a member of IBC; and

         WHEREAS, IMG, as and for its capital contribution to IBC, has agreed to
arrange  for  the  licensing  or  sublicensing  by  Immunomedics  to  IBC of the
Immunomedics Patent Property and the Immunomedics Biotechnology Assets; and

         WHEREAS,  Immunomedics is willing, as and for its capital  contribution
to IMG, to license or sublicense to IBC said  Immunomedics  Patent  Property and
the Immunomedics Biotechnology Assets and provide such services and Mabs to IBC,
subject to the terms and conditions contained herein;

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

1.       DEFINITIONS.

         1.1 "Affiliate" of a party shall mean any corporation or other business
entity  controlled  by,  controlling  or under common control of a party to this
Agreement.  The word and root  "control" in the context of a  corporation  shall
mean direct or indirect beneficial  ownership of at least fifty percent (50%) of
the  shares  entitled  to vote for  members  of the Board of  Directors  of such
corporation;  and, in the  context of any other  business  entity,  the right to
receive at least fifty percent (50%) of the net income of such business  entity.

<PAGE>

Notwithstanding  the  foregoing,  for purposes of this  Agreement,  Immunomedics
shall be deemed to be an Affiliate of IBC as long as Immunomedics  owns directly
or  beneficially at least fifteen percent (15%) of the shares of IBC entitled to
vote for members of the Board of  Directors  of IBC, but IBC shall not be deemed
to be an  Affiliate  of  Immunomedics,  and IBC  shall  not be  deemed  to be an
Affiliate of Coulter  Corporation,  Immunotech S.A. or Immunotech  Partners S.A.
nor shall Coulter  Corporation,  Immunotech S.A. or Immunotech  Partners S.A. be
deemed to be Affiliates of IBC.

         1.2  "Immunomedics  Patent  Property"  shall  mean  each and all of the
patents and  applications  contained in Exhibit 1; the patents  which issue from
such applications, as well as patents issuing from any continuation, substitute,
division, or continuation-in-part of the Exhibit 1 patents and applications, and
any reissues,  reexaminations  or  extensions of such patents;  and, all foreign
counterpart  applications and the patents which issue  therefrom,  including all
foreign   applications   which  claim   priority   from  any  of  the  foregoing
applications.  For  the  purposes  of this  agreement,  a  "foreign  counterpart
application"  is an  application  filed  in a  country  other  than  that of the
basic/parent  application which application claims subject matter disclosed,  in
whole or in part, in such basic/parent application.

         1.3  "Immunomedics  Biotechnology  Assets"  shall  mean:  (a) Class III
CEA-specific monoclonal antibodies,  and methods,  processes,  and protocols for
their production;  (b) technology for producing humanized Class III CEA-specific
monoclonal antibodies;  and (c) patents and patent applications having claims to
the use of lysine to reduce renal toxicity of cancer  radioimmunotherapy  within
the IBC Field.  In each case the assets include those assets owned or controlled
by Immunomedics now or at any time during the term of this Agreement .

         1.4  "AES  Technology"  shall  mean  technology  in  which  bi-specific
antibodies and radiolabeled  bivalent haptens are used to increase dose delivery
to tumors and reduce  toxic side  effects  caused by high levels of compounds in
healthy  tissue and organs  and which is  covered by one or more  patent  claims
contained in one or more patents and patent applications listed in Exhibit 2.

         1.5 "Control"  "Controls" and "Controlled By" shall mean the ability to
grant the licenses or sublicenses  herein or to provide the Mabs or services set
forth herein,  as the case may be, without  violating the terms of any agreement
or other arrangement with any third party.

         1.6 "IBC Field"  shall mean the field of  radioimmunotherapy  (RAIT) of
cancer using AES Technology,  including  applications  solely for laboratory and
clinical research purposes.

         1.7      "Mabs" shall mean monoclonal antibodies or fragments thereof.

                                       2
<PAGE>

2.       GRANTS AND SERVICES.

         2.1      Grant to IBC.

                  2.1.1   Immunomedics   hereby   grants  to  IBC  a  worldwide,
royalty-free,   exclusive   license,   limited  to  the  IBC  Field,  under  the
Immunomedics  Patent  Property and the  Immunomedics  Biotechnology  Assets,  to
practice any and all methods,  and to use,  offer for sale, and sell any and all
kits, components,  reagents,  Mabs and products which are covered by one or more
claims in said Immunomedics  Patent Property or are included in the Immunomedics
Biotechnology Assets.

                  2.1.2 IBC has the right to sublicense its rights  described in
Section 2.1.1 to its Affiliates,  comarketers and  distributors,  subject to the
same limitations that apply to the underlying  license,  except for the right to
further sublicense.

         2.2      Supply of Mabs and Products to IBC

                  2.2.1   Immunomedics   shall,  in  accordance  with  a  supply
agreement to be hereafter  mutually  agreed upon,  supply to IBC its  reasonable
requirements of CEA-specific  Mabs covered by the  Immunomedics  Patent Property
and Immunomedics Biotechnology Assets, on reasonable commercial terms.

                  2.2.2 Immunomedics shall, once a product or products have been
developed by IBC,  negotiate in good faith a supply agreement with IBC to supply
to IBC its reasonable  requirements of finished products comprising CEA-specific
Mabs, on reasonable commercial terms.

                  2.2.3 In the event that the  parties  are unable to agree upon
the terms of the supply  agreement  described in Sections  2.2.1 and 2.2.2,  the
terms of that agreement will be determined in a binding  arbitration  proceeding
as described in Section 15 below.

                  2.2.4  To  ensure  supply  of the  Immunomedics  Biotechnology
Assets,  Immunomedics  shall  establish and maintain  viable samples of all cell
lines necessary to manufacture the Mabs and humanized Mabs described in Sections
1.3(a) and 1.3(b) at an off-site location.



         2.3      Access to Technology

                  2.3.1   Immunomedics   has  licenses  and  rights  to  certain
technology for producing  humanized Mabs (hMabs) and shall, upon written request

                                       3
<PAGE>

from IBC, use reasonable commercial efforts to apply such technology to generate
humanized  anti-hapten  Mab  for  use  with  the  AES  Technology,   subject  to
Immunomedics'  right to practice  such  technology  on behalf of others and also
subject to the payment by IBC of any  royalties  owed by  Immunomedics  to third
parties by reason of Immunomedics  applying such technology on behalf of IBC. If
Immunomedics   is  successful  in   constructing   a  suitable   humanized  Mab,
Immunomedics shall negotiate in good faith a supply agreement with IBC to supply
to IBC on  reasonable  commercial  terms  its  reasonable  requirements  of such
humanized anti-hapten Mab.

                  2.3.2  Immunomedics  has licenses and rights to certain lysine
adjuvant treatment technology for mitigating the side effects of RAIT and agrees
to make such  technology  available to IBC for use in the IBC Field , subject to
Immunomedics'  right to grant  sublicenses  thereunder  and also  subject to the
payment by IBC if any royalties owed by  Immunomedics to third parties by reason
of Immunomedics applying such technology on behalf of IBC.

         2.4      Use of Biotechnology Assets.

                  2.4.1 IBC agrees  that it will not itself  produce nor use any
third party to produce the Mabs to be supplied by Immunomedics  under the supply
agreement to be hereafter negotiated, and that it will use the CEA-specific Mabs
supplied by Immunomedics  solely for products and applications in the IBC Field.
IBC will protect the  confidentiality  of the intellectual  property relating to
the Immunomedics Biotechnology Assets with at least the same care as used by IBC
to  protect  its own  biotechnology  assets of  comparable  value.  IBC will use
reasonable  commercial  efforts  to keep  records of the use,  distribution  and
location of each lot of CEA-specific Mabs provided by Immunomedics.

         2.5      Right of First Negotiation for New Technology

                  2.5.1  Immunomedics  hereby  grants  to IBC the right of first
negotiation  to license,  on  reasonable  commercial  terms,  future  technology
developed or acquired by Immunomedics and under which Immunomedics has the right
to grant  licenses or  sublicenses in the IBC Field that may be useful to IBC to
improve its products in the IBC Field.  This right of first negotiation shall be
in force for a period of 60 days from the date that IBC  requests a license  for
any such technology.

         2.6      Right   of   First  Negotiation  for  Marketing,  Selling  and
                  Distribution

                  2.6.1  Upon   request  by   Immunomedics,   IBC  shall  inform
Immunomedics of the territories where IBC is marketing IBC products. For any IBC
products that are marketed,  sold, or distributed in at least one territory, IBC
hereby grants to Immunomedics the right of first negotiation to market, sell and
distribute  those products in any other  territory where  Immunomedics  markets,

                                       4
<PAGE>

sells or distributes its own products but where IBC does not itself market, sell
or  distribute  the  IBC  products   (hereinafter   the   "Available   Marketing
Territories"). This right of first negotiation shall be in force for a period of
60 days  from  the date  that  Immunomedics  requests  marketing  rights  in the
Available Marketing Territories.


3.       CONSIDERATION.

         3.1 IBC  Stock  Consideration  To IMG.  As full  consideration  for the
grants set forth in Section 2.1 of this Agreement, IBC shall sell and deliver to
IMG the  ownership  of Three  Million  Seven  Hundred  Twenty-Nine  Thousand Six
Hundred  (3,729,600)  shares of IBC's  Series A  Preferred  Membership  Interest
Units, pursuant to that certain Operating Agreement of IBC, dated as of March 5,
1999, by and among IMG.,  IBC and certain other parties,  said  conveyance to be
made on the Effective Date hereof.


4.       IMMUNOMEDICS REPRESENTATIONS AND WARRANTIES,
         DISCLAIMERS AND INDEMNIFICATION.

         Immunomedics represents and warrants:

         4.1      Property.

                  4.1.1  Immunomedics  owns or Controls the Immunomedics  Patent
Property and Immunomedics Biotechnology Assets applicable to AES Technology.

                  4.1.2  If  Immunomedics  should  do  anything  or  fail  to do
anything  it is  required  to do in  the  agreements  granting  it  licenses  of
Immunomedics  Patent  Property  which  result  in the loss of such  licenses  or
jeopardize the sublicense granted hereunder to IBC, Dr. David M. Goldenberg, the
licensor of such Immunomedics Patent Property,  by his  countersignature to this
Agreement,  agrees to directly license IBC so as to maintain the same rights and
conditions under which IBC is licensed under this Agreement.

                  4.1.3 Immunomedics has not been sued or charged as a defendant
in any claim,  suit, action or proceeding which involves a claim of infringement
of any patents or violation of any trade  secret or other  proprietary  right of
any third  party  with  respect  to the  Immunomedics  Biotechnology  Assets and
Immunomedics  Patent  Property.   The  Immunomedics   Biotechnology  Assets  and
Immunomedics Patent Property are not subject to any outstanding order, judgment,
decree, stipulation or agreement restricting in any manner the sale, assignment,
licensing or sublicensing thereof by Immunomedics.

                  4.1.4 Except for current litigation against  Hoffmann-La Roche
("Roche")  and claims or defenses  by Roche and its  affiliates  of  invalidity,
Immunomedics  has no knowledge  of any claims with  respect to the  Immunomedics

                                       5
<PAGE>

Patent Property that have been asserted or threatened,  by any other person,  or
of any  valid  grounds  for any bona  fide  claims  challenging  the  ownership,
validity or enforceability of any of the Immunomedics Patent Property,  nor does
any officer of Immunomedics have any knowledge of any material unauthorized use,
infringement or  misappropriation  of any of the Immunomedics Patent Property by
any third party, including any employee or former employee of Immunomedics.

                  4.1.5  Nothing  in this  agreement  shall  be  construed  as a
warranty or  representation  by Immunomedics  that anything made by Immunomedics
and sold to IBC or made, used,  sold, or otherwise  disposed of by IBC under any
license  or  sublicense  granted  in this  agreement  is or  will  be free  from
infringement  of  patents  of third  parties.  Immunomedics  makes no  warranty,
express or implied,  concerning  the fitness for any  particular  purpose of any
products licensed or the property rights licensed to IBC.

         4.2  DISCLAIMER.  NOTHING  IN THIS  AGREEMENT  SHALL BE  DEEMED TO BE A
REPRESENTATION  OR  WARRANTY  BY  IMMUNOMEDICS  OF  THE  ACCURACY,   SAFETY,  OR
USEFULNESS  FOR  ANY  PURPOSE  OF  ANY  TECHNICAL  INFORMATION,  TECHNIQUES,  OR
PRACTICES AT ANY TIME MADE AVAILABLE BY IMMUNOMEDICS. IMMUNOMEDICS SHALL HAVE NO
LIABILITY WHATSOEVER TO IBC OR ANY OTHER PERSON FOR OR ON ACCOUNT OF ANY INJURY,
LOSS, OR DAMAGE, OF ANY KIND OR NATURE,  SUSTAINED BY, OR ANY DAMAGE ASSESSED OR
ASSERTED  AGAINST,  OR ANY OTHER LIABILITY  INCURRED BY OR IMPOSED ON IBC OR ANY
OTHER  PERSON,  ARISING OUT OF OR IN CONNECTION  WITH OR RESULTING  FROM (A) THE
PRODUCTION,  USE, OR SALE OF ANY  APPARATUS  OR PRODUCT,  OR THE PRACTICE OF THE
PATENTS;  (B) THE USE OF ANY  TECHNICAL  INFORMATION,  TECHNIQUES,  OR PRACTICES
DISCLOSED  BY  IMMUNOMEDICS;   OR  (C)  ANY  ADVERTISING  OR  OTHER  PROMOTIONAL
ACTIVITIES WITH RESPECT TO ANY OF THE FOREGOING.

         4.3  Indemnification.  IBC  shall  hold  Immunomedics,  its  directors,
officers,  employees  and agents,  harmless from and against any and all claims,
expenses  (including  reasonable  attorneys  fees),  proceedings,   demands  and
liability  of any  kind  whatsoever  arising  out of or in  connection  with  or
resulting from any of the matters described in Section 4.2 hereof.

         4.4  Insurance.  IBC shall  obtain  and carry in full  force and effect
liability  insurance which shall fully protect  Immunomedics in regard to events
covered by Section 4.2 above.  IBC shall cause  Immunomedics to be included as a
named insured on any such insurance.  IBC shall furnish  certificate(s)  of such
insurance to  Immunomedics,  upon request.  The amount of such coverage shall be
the maximum obtainable at reasonable cost.

5.       IBC REPRESENTATIONS AND WARRANTIES.

                                       6
<PAGE>

         IBC represents and warrants:

         5.1  Organization  and  Good  Standing.  IBC  is  a  limited  liability
corporation,  legally and validly incorporated,  organized, existing and in good
standing under the laws of the State of Delaware.

         5.2      Authority Regarding this Agreement.

                  5.2.1 IBC has the  complete  and  unrestricted  right,  power,
authority and capacity to: (a) execute and deliver this Agreement; and (b) carry
out and perform IBC's obligations pursuant to this Agreement.

                  5.2.2  No  further  corporate  or  shareholder   approvals  or
proceedings  are necessary on the part of IBC to authorize this Agreement or any
of the transactions contemplated hereby. The execution, delivery and performance
of this  Agreement  by IBC does not  require  notice to, or consent or  approval
from, any governmental body or other regulatory authority.

                  5.2.3 This  Agreement  has been duly and validly  executed and
delivered  by  IBC  and  is a  legal,  valid  and  binding  obligation  of  IBC,
enforceable in accordance with its terms.


6.       PATENT PROPERTY.

         6.1  Prosecution  and  Maintenance.  Immunomedics  shall,  at  its  own
expense,  (i) file and prosecute all patent  applications  contained  within the
Immunomedics  Patent Property and (ii) maintain all patents contained within the
Immunomedics Patent Property; provided that Immunomedics may abandon one or more
applications or patents  contained  within the  Immunomedics  Patent Property if
Immunomedics  and IBC agree that the prospect for  obtaining  commercial  useful
protection  does not justify the cost of pursuing or maintaining the application
or patent.

         6.2      Infringement of Patent Property by Third Parties.

                  6.2.1 Notice.  Each party shall  promptly  notify the other in
writing of any alleged or threatened  infringement  of the  Immunomedics  Patent
Property of which it becomes aware and which may adversely  impact the rights of
IBC hereunder.

                  6.2.2 Enforcement Action. In the event that the parties become
aware of any such alleged or threatened  infringement of the Immunomedics Patent
Property by a person or entity who is a direct  competitor of IBC,  Immunomedics
shall have the right, but not the obligation, to take appropriate action against
such  person  or  entity.  In the  event  Immunomedics  fails  to  institute  an
infringement   suit  or  take  other  reasonable  action  in  response  to  such

                                       7
<PAGE>

infringement  within  sixty  (60) days,  IBC shall  have the right,  but not the
obligation upon thirty (30) days notice to Immunomedics,  to institute such suit
or take other  appropriate  action in its own name;  provided  however,  that if
necessary,  Immunomedics agrees to be joined as a party plaintiff. Regardless of
which party brings such  enforcement  action,  the other party hereby  agrees to
cooperate reasonably in any such effort. The party not bringing the action shall
have the right to  participate  in such action at its own  expense  with its own
counsel and any recovery  obtained by settlement or otherwise shall be disbursed
as follows:  each party shall first recover any reasonable  expenses incurred in
such action (including  counsel fees).  Thereafter,  the parties shall share any
remaining recovery in the same proportion as their recovered costs. In the event
that the party not  bringing  the  action  does not want to  participate  in the
recovery obtained by settlement or otherwise, then the party instituting the law
suit shall be  responsible  for all costs and expenses of the  non-participating
party in cooperating with the party instituting the law suit.

         6.3      Infringement of Third Party Patent Rights.

                  6.3.1  In the  event  that  the use or sale  of a  process  or
product  incorporating  AES  Technology  in the IBC  Field  and  covered  by the
Immunomedics Patent Property becomes the subject of a claim of infringement of a
patent or other proprietary  right, the parties shall promptly confer to discuss
the claim and whether a joint defense is feasible or desirable.

                  6.3.2 Unless the parties otherwise agree, IBC shall assume the
responsibility  and  expense  for the  conduct of the  defense of any such claim
described  in Section  6.3.1.  Immunomedics  shall  have the right,  but not the
obligation,  to  participate  in any such suit at its sole option and at its own
expense.  Each party shall  reasonably  cooperate with the party  conducting the
defense of the claim.  No party shall enter into any settlement that affects any
other party's rights or interests  without such other party's  written  consent,
not to be unreasonably withheld.

         6.4      Joint inventions.

                  6.4.1  "Joint  Invention(s)"  means  any  discovery,   whether
patentable or otherwise, relating to the AES Technology which is jointly made by
one or more  employees  of IBC and one or more  employees of  Immunomedics,  the
inventorship  to be determined  by the criteria  used to determine  inventorship
under U.S. patent law, and any U.S. or foreign patent  application  claiming the
discovery, together with all divisions,  continuations, or continuations-in-part
thereof, and any patents issued thereon or reissues or extensions thereof.

                  6.4.2. IBC and Immunomedics shall be joint owners of the Joint
Invention(s),  all  know-how  and  information  necessary  to practice the Joint
Invention(s),  any  applications  for  patent  which  may be filed on the  Joint
Invention(s),   and  any   improvements   thereon  which  arise  from  continued

                                       8
<PAGE>

collaborative  research between the parties,  and each and every patent covering
the Invention(s), or such improvements,  that may be issued in the United States
of America and in any foreign country.  IBC and  Immunomedics  shall each have a
fifty percent (50%) interest in each Joint Invention.

                  6.4.3 Responsibility for preparing,  filing, prosecuting,  and
maintaining all patent applications and patents embodying the Joint Invention(s)
shall be with Immunomedics, who will consult with and keep IBC fully informed as
to  the  preparation,   filing,   prosecution  and  maintenance  of  all  patent
applications  and patents  relating to the Joint  Invention(s).  Prosecution  or
maintenance  of any  patent or patent  application  shall  not be  abandoned  by
Immunomedics without the written consent of IBC.
                  6.4.4  Immunomedics  and IBC will  each use  their  reasonable
efforts to assure that the inventors and other employees thereof fully cooperate
in  the  preparation,   filing,  prosecution,  and  maintenance  of  all  patent
applications and patents embodying the Joint Invention(s).

                  6.4.5 IBC shall pay all reasonable  expenses  associated  with
preparing,  filing,  prosecuting,  and maintaining all patent  applications  and
patents relating to the Joint  Invention(s),  unless  Immunomedics is also using
the technology  covered by the claims of the application or patent in which case
the parties shall share equally in such costs and expenses.  Immunomedics  shall
maintain  adequate records showing all expenses incurred in connection with such
patent  applications  and  patents,  which  shall be made  available  to IBC for
inspection on reasonable notice. In the event that Immunomedics  anticipates the
possibility  of any  extraordinary  expenditures  arising from the  preparation,
filing,  prosecution,  or  maintenance  of  any  patent  application  or  patent
contemplated  by this  Agreement,  Immunomedics  shall  provide  IBC  with  full
particulars  and shall  discuss  with IBC mutually  acceptable  course of action
prior to incurring such expenditures.  IBC shall reimburse Immunomedics for such
costs  and  expenses  within  sixty  (60)  days of  receiving  an  invoice  from
Immunomedics for such expenses.

                  6.4.6 Either party may elect to discontinue  its obligation to
pay or reimburse  expenses  associated with any selected  patent  application or
patent for a Joint Invention within any national  jurisdiction,  upon sixty (60)
days written notice by such party (the  "Terminating  Party") to the other party
(the "Continuing Party").

                  6.4.7 The Continuing Party may elect to request  assignment of
the  selected  patent  rights  owned  by the  Terminating  Party  in  the  Joint
Invention(s) and any licenses issued for said Joint Invention(s). The Continuing
Party shall make its election and shall advise the Terminating  Party in writing
within  thirty  (30) days  after  receipt  of a notice of  discontinuance  under
Section  6.4.6.  Subject  to the  assumption  by the  Continuing  Party  of sole
responsibility  for the  management and expense of the Joint  Invention(s),  the
Terminating  Party  shall  convey  to the  Continuing  Party  assignment  of the

                                       9
<PAGE>

Invention(s)  and licenses,  and shall do all things  necessary to transfer file
wrappers and other files  related to such rights and licenses to the  Continuing
Party or its designee.  Upon  perfection of such  assignments,  the  Terminating
Party shall have no further  rights or  obligations  with  respect to such Joint
Invention, and the Continuing Party may thereafter separately license such Joint
Invention, without accounting to the Terminating Party.


7.       TERM AND TERMINATION.

         7.1 Term. This Agreement shall become  effective  immediately  upon the
Effective Date and, unless earlier  terminated by the provisions for termination
herein,  shall continue in effect until the last to expire of the patents within
the  Immunomedics  Patent  Property  to which IBC has a license  or  sublicense,
whether  such patent is currently  issued or issues from any patent  application
contained within the Immunomedics Patent Property.

         7.2      Termination.

                  7.2.1 Material Default By Licensee Upon any material breach or
default  under  this  Agreement  by IBC,  Immunomedics  shall  have the right to
terminate  this  Agreement  and  the  rights,  privileges  and  license  granted
hereunder by forty-five  (45) days advance notice to IBC specifying such default
or  breach.  Such  termination  shall  become  effective  unless  IBC shall have
substantially  cured any such breach or default  prior to the  expiration of the
said forty- five (45) day period, or, if the breach or default cannot reasonably
be cured within such forty-five  (45) day period,  IBC shall have commenced such
cure within such forty-five (45) day period and shall diligently  prosecute such
cure to completion  within not more than an additional  forty-five (45) days. In
the event IBC: (i) becomes insolvent, makes a general assignment for the benefit
of its creditors,  or admits in writing its inability to pay its debts generally
as they  become  due;  (ii) files a voluntary  petition  in  bankruptcy,  or, by
voluntary petition,  answer or consent, seeks relief under the provisions of any
bankruptcy or other similar law providing for its  reorganization or winding up,
or  providing  for an  agreement,  composition,  extension  or  adjustment  with
creditors;  petitions  or  consents  to  the  appointment  of a  receiver,  this
Agreement may be terminated  immediately  and without notice by  Immunomedics at
Immunomedics'  option.  In the  event  of an  involuntary  bankruptcy  petition,
Immunomedics  may immediately  suspend the license granted under this Agreement,
subject to  reinstatement  only if the bankruptcy is dismissed within sixty (60)
days or, in the case of a receiver,  such appointment is being contested in good
faith and such appointment is dismissed within sixty (60) days.



8. ASSIGNABILITY. Neither this Agreement nor any part hereof shall be assignable
by either party  without the prior,  express,  written  permission  of the other

                                       10
<PAGE>

party,  which  permission  shall not be  unreasonably  withheld or delayed.  Any
attempted  assignment  without such consent shall be void.  Notwithstanding  the
preceding two sentences,  any party may assign this Agreement to an Affiliate or
in connection with the merger, consolidation,  transfer or sale of substantially
all of its assets relating to this Agreement.

9. NOTICES.  All notices  required or permitted to be given under this Agreement
shall be in writing and shall be mailed by registered or certified mail, postage
prepaid and receipt requested, addressed to the signatory to whom such notice is
required  or  permitted  to be given  or sent by  facsimile  or when  personally
delivered.  All  notices  shall be deemed to have been  given  when  mailed,  as
evidenced  by the return  receipt or, when sent by  facsimile,  as  evidenced by
acknowledgment  of transmission,  or by overnight  delivery e.g.,  Express Mail,
Fed. Ex., UPS, DHL, with receipt in good order requested and received.
                  To Immunomedics:

                                    Robert J. DeLuccia
                                    President and CEO
                                    Immunomedics, Inc.
                                    300 American Road
                                    Morris Plains, New Jersey 07950
                                    Facsimile: 973-605-8282


                  To IBC:

                                    IBC Pharmaceuticals, Inc.
                                    c/o  Dr. David Goldenberg
                                    Immunomedics, Inc.
                                    300 American Road
                                    Morris Plains, New Jersey 07950
                                    Facsimile: 973-605-8311


Any party may, by written  notice to the others,  designate a new  addressee  or
address to which  notices to the party  giving the notice  shall  thereafter  be
mailed or sent by facsimile.

10. SEVERABILITY. If a court of competent jurisdiction declares any provision of
this Agreement  invalid or  unenforceable,  or if any government or other agency
having jurisdiction over either  Immunomedics,  or IBC deems any provision to be
contrary to any laws,  then that provision shall be severed and the remainder of
the Agreement shall continue in full force and effect.  To the extent  possible,

                                       11
<PAGE>

the parties shall revise such invalidated provision in a manner that will render
such provision valid without impairing the parties' original interests.

11. ENTIRE AGREEMENT.  This instrument contains the entire Agreement between the
parties  relative to its subject matter.  No verbal  agreement,  conversation or
representation  between any officers,  agents or employees of the parties hereto
before the execution of this  Agreement  shall affect or modify any of the terms
or obligations herein contained.

12. MODIFICATIONS IN WRITING. No change, modification, extension, termination or
waiver of this Agreement,  or any of the provisions herein  contained,  shall be
valid unless made in writing and signed by a duly authorized  representative  of
each party.

13.  GOVERNING  LAW. The validity and  interpretation  of this Agreement and the
legal  relations of the parties to it shall be governed by the laws of the State
of New Jersey, excluding New Jersey's conflict of laws principles

14.  CONSTRUCTION.  The parties agree that they have participated equally in the
formation  of this  Agreement  and that the  language  herein  should  be not be
presumptively construed against any of them.

15.      ARBITRATION.

         15.1 Any  controversy  or claim  arising  out of, or  relating  to this
Agreement  shall be resolved by final and binding  arbitration in Morris Plains,
New Jersey under the Commercial  Arbitration  Rules of the American  Arbitration
Association then obtaining.

         The arbitration shall be subject to the following terms:

                  (a)      The  number of arbitrators  shall be three (3) unless
otherwise agreed to by the parties to the dispute.

                  (b) The arbitrators  shall each be an  independent,  impartial
third party having no direct or indirect  personal or financial  relationship to
either of the parties to the dispute,  who has agreed to accept the  appointment
as arbitrator on the terms set forth in this Article 15.

                  (c)  The  arbitrators  shall  each  be an  active  or  retired
attorney,  law  professor  or  judicial  officer  with at least  five (5)  years
experience in general  commercial  matters and a familiarity with the technology
relating to this  agreement and with the laws  governing  proprietary  rights in
intellectual property to the extent necessary to adjudicate the dispute.

                  (d) The arbitrators shall be selected as follows:

                                       12
<PAGE>

                           (i)      Within   thirty  (30)  days of a request for
arbitration made by either party,  Immunomedics  shall select one arbitrator and
IBC shall select one  arbitrator and these two  arbitrators  shall then agree on
the selection of a third arbitrator.

                           (ii)     If  the  method  of  selection  set  out  in
Section  15.1(d)(i)  fails for any reason,  then either  party may  petition the
American   Arbitration   Association  for  appointment  of  the  arbitrators  in
accordance  with its rules,  provided  that the  arbitrators  must  satisfy  the
requirements of (b) and (c) above.

                   (e) The dispute  shall be submitted to the three  arbitrators
within  ninety  (90) days after  they have been  selected.  A decision  shall be
rendered within sixty (60) days after the dispute is submitted.

                   (f) The  arbitrators  shall  render  a  decision  in  writing
accompanied by written  findings  explaining the facts  determined in support of
the decision and any relevant conclusions of law.

                   (g) The fees of the  arbitrators and any other costs and fees
associated with the arbitration shall be paid in accordance with the decision of
the arbitrators.

                   (h) The  arbitrators  shall have no power to add to, subtract
from, or modify any of the terms or conditions of this  Agreement.  Any decision
rendered  in such  arbitration  may be  enforced  by either  party in the United
States  District  Court  for the  Northern  District  of New  Jersey,  to  whose
jurisdiction  for such  purposes the parties to the dispute  hereby  irrevocably
consent and submit.

16. FURTHER ASSURANCES.  Each party agrees to furnish, upon request of the other
party,  such  further  information  as may be  required  to give  effect  to the
transactions  contemplated  by this  Agreement and to permit each party to fully
enjoy the benefit of the rights and grants  provided  hereunder.  In the event a
party makes a good faith  determination that it is necessary for the other party
to take  certain  additional  actions  to give full  effect to the  transactions
contemplated  by this  Agreement  and to permit  each  party to fully  enjoy the
benefit of the rights transferred  hereunder,  such party shall notify the other
of its  determination and the parties agree to meet to discuss in good faith the
possibility of such additional actions being taken.

17.      CONFIDENTIALITY

         17.1 Non-Disclosure and Non-Use of Confidential  Information.  Anything
in this  Agreement to the contrary  notwithstanding,  all  knowledge,  know-how,
practices,   process  or  other   information   (hereinafter   referred   to  as
"Confidential Information") disclosed or submitted, either orally, in writing or
in other  tangible  or  intangible  form  which is  designated  as  Confidential
Information by either party to the other shall be received and maintained by the
receiving  party in strict  confidence  and shall not be  disclosed to any third

                                       13
<PAGE>

party,  except that  disclosure may be made to Coulter  Corporation  and Beckman
Coulter Inc.  (hereinafter  collectively  "Coulter"),  and  Immunotech  S.A. and
Immunotech  Partners,   S.A.   (hereinafter   collectively   "Immunotech")  with
disclosing  parties  assuring  that Coulter and  Immunotech,  shall abide by the
obligations  of this Article 17. Oral  disclosures of  Confidential  Information
which the  disclosing  party wishes to be maintained  in  confidence  under this
Article 17 shall be reduced to writing within  fourteen (14) days of disclosure.
Furthermore,  neither  party  shall  use the  Confidential  Information  for any
purpose other than those purposes  specified in this Agreement.  The parties may
disclose  Confidential  Information  to the  minimum  number of their  employees
reasonably  requiring  access  thereto  for  the  purposes  of  this  Agreement,
provided,  however, that prior to making any such disclosures each such employee
or other  recipient  shall be  apprised of the duty and  obligation  to maintain
Confidential  Information  in  confidence  and  not  to  use  such  Confidential
Information  for any  purpose  other  than in  accordance  with  the  terms  and
conditions  of  this  Agreement.  The  confidentiality   obligation  under  this
paragraph shall survive the expiration or early termination of this Agreement.

         17.2     Limitation on Confidentiality

                  17.2.1 Subject to Section  17.2.2,  nothing  contained  herein
will in any way restrict or impair  either  party's right to use,  disclose,  or
otherwise deal with any Confidential Information which:

                           (i)  At   the   time  of  its  receipt  is  generally
available to the public or thereafter becomes available to the public through no
act or failure to act of the receiving party; or

                           (ii) Was independently known prior to receipt thereof
as shown by written  records,  or thereafter is made available to such receiving
party as a matter of lawful  right by a third party who does not require that it
be maintained confidential.

                           (iii) Is  thereafter  independently  developed by the
receiving party without use of or access to the Confidential  Information of the
disclosing party.

                  17.2.2 If any designated Confidential  Information received by
a party is believed to be exempt from the confidentiality  obligation of Section
17.2.1,  the receiving party shall notify the disclosing party in writing within
ten (10) days of receipt  and shall  provide  documentation  substantiating  the
claim for  exemption,  failing which the  purported  exemption is waived and the
confidentiality  obligation  of Section  17.2.1 shall  continue to apply to such
designated Confidential Information.

18.  COUNTERPARTS.  This Agreement may be executed in one or more  counterparts,
each of which shall be an original  and all of which shall  constitute  together
the same document.

                                       14
<PAGE>


         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed in duplicate by their duly authorized  representatives  as of the dates
noted below.



<PAGE>




IMMUNOMEDICS, INC.                          IBC PHARMACEUTICALS, L.L.C.



By: ____________________________            By:  ___________________________
       Robert J. DeLuccia
Title: President and CEO                    Title:


Date:___________________________            Date:___________________________



I agree to the provisions of Section 4.1.2 of this Agreement.


________________________________
David M. Goldenberg, Sc.D., M.D.


Date:___________________________



<PAGE>



                                    EXHIBIT 1

                          IMMUNOMEDICS PATENT PROPERTY

(a)      U.S. PATENTS:

         US 4,818,709

(b)      U.S. PATENT APPLICATIONS:

         US 08/318,157 (now allowed - to issue 2/25/99)

(c)      CORRESPONDING FOREIGN PATENTS AND APPLICATIONS

         Japan 2,598,893, Japan 254809/94 (Div.), Japan 8-512588

         Australia 629,213, Australia 582,731, Australia 37196/95

         Canada 1,274,794, Canada 2,200,868

         Israel 70746

         EPO  131,627,   (Austria,   Belgium,  France,  G. Britain,  W. Germany,
         NetherlandS, Luxembourg, Sweden, Switzerland/Liechtenstein)

         EPO 95935020.8



<PAGE>



                                    EXHIBIT 2

                           IMMUNOTECH PATENT PROPERTY


I.       PRIORITY PATENT APPLICATIONS:

         A.  PRIORITY PATENT APPLICATIONS:

         1.       FRENCH  PATENT  APPLICATION  NO. 8613146  FILED  SEPTEMBER 19,
1986, AND GRANTED AS FRENCH PATENT NO.  2604092,  ON APRIL 13, 1990 AND ENTITLED
"AFFINITY ENHANCEMENT  IMMUNOLOGICAL  REAGENTS FOR IN VIVO DETECTION AND KILLING
OF  SPECIFIC  TARGET  CELLS"  AND  ASSIGNED  TO  IMMUNOTECH,  S.A.  (HEREINAFTER
"AFFINITY ENHANCEMENT PATENT")

         2.       FRENCH  PATENT  APPLICATION   NO. 8912622 FILED  SEPTEMBER 21,
1989, AND GRANTED AS FRENCH PATENT NO. 2652004, ON OCTOBER 28, 1994 AND ENTITLED
"HYDROPHILIC  DERIVATIVES,  THEIR  APPLICATION TO DIAGNOSIS AND TO THERAPEUTICS,
DIAGNOSTIC  OR  THERAPEUTIC  KITS  AND  IMMUNOLOGICAL   REAGENTS"   (HEREINAFTER
"HYDROPHILIC DERIVATIVES PATENT")

         3.       FRENCH  PATENT  APPLICATION   NO.  9213267  FILED  OCTOBER 27,
1992,  AND GRANTED AS FRENCH  PATENT NO.  2697255 ON JANUARY  13, 1995  ENTITLED
"TECHNETIUM  OR  RHENIUM-BINDING  BI-HAPTEN  DERIVATIVES,  A  PROCESS  FOR THEIR
PREPARATION,  DIAGNOSTIC AND THERAPEUTIC APPLICATION, AND KITS AND IMMUNOLOGICAL
REAGENTS  CONTAINING  THE SAME"  ASSIGNED TO  IMMUNOTECH  PARTNERS  (HEREINAFTER
"TECH-RHE BIVALENT HAPTENS PATENT")

         B. CORRESPONDING FOREIGN PATENTS AND APPLICATIONS:

         1. CORRESPONDING TO AFFINITY ENHANCEMENT PATENT

                  (a)     EUROPEAN  PATENT   NO.  263046 GRANTED APRIL 15, 1992.
         NATIONALIZED IN  AUSTRIA AS PATENT NO. 74769,  GERMANY AS PATENTSCHRIFT
         NO. 3778281 AND SPAIN AS PATENT NO. 2032468.

                  (b)     AUSTRALIAN PATENT NO. 613318, ACCEPTED AUGUST 1, 1991.

                  (c)     CANADIAN PATENT NO. 1306414, GRANTED AUGUST 18, 1992.

                  (d)     FRENCH  PATENT NO. 2604092, GRANTED APRIL 13, 1990.

<PAGE>

                  (e)     JAPANESE  PATENT APPLICATION NO. 2612454, EXAMINED MAY
         21, 1997.

                  (f)     KOREAN  PATENT  APPLICATION NO. 9005622, EXAMINED JULY
         31, 1990.

                  (g)     U.S. PATENT NO. 5,256,395 GRANTED OCTOBER 26, 1993.

         2. CORRESPONDING TO HYDROPHILIC DERIVATIVE PATENT

                  (a)     EUROPEAN PATENT NO. 419387, GRANTED NOVEMBER 20, 1996.
         NATIONALIZED  IN  AUSTRIA  AS PATENT NO. 145338 AND SPAIN AS PATENT NO.
         2094750.

                  (b)     AUSTRALIAN PATENT NO. 638488, ACCEPTED JULY 1, 1993.

                  (c)     CANADIAN PATENT NO. 2025607, GRANTED MARCH 22, 1991.

                  (d)     FRENCH PATENT NO. 2652004, GRANTED OCTOBER 28, 1994.

                  (e)     GERMAN PATENT PUBLICATION NO. 69029184, PUBLISHED JUNE
         5, 1997.

                  (f)     JAPANESE  PATENT  APPLICATION NO. 3173900, UNEXAMINED,
         JULY 29, 1991.

                  (g)     U.S. PATENT NO. 5,274,076 ISSUED DECEMBER 28, 1993.

         3. CORRESPONDING TO TECH-RHE BIVALENT HAPTENS PATENT

                  (a)     EUROPEAN PATENT PUBLICATION NO. 595743,  PUBLISHED MAY
         4, 1994.

                  (b)     AUSTRALIAN PATENT APPLICATION NO. 669219, ACCEPTED MAY
         30, 1996.

                  (c)     CANADIAN PATENT NO. 2109256, GRANTED APRIL 28, 1994.

                  (d)     JAPANESE  PATENT APPLICATION NO.  6321809, UNEXAMINED,
         NOVEMBER 22, 1994.

<PAGE>

                               OPERATING AGREEMENT

                                       OF

                               IMG TECHNOLOGY, LLC


                            Dated as of March 5, 1999


<PAGE>



                                TABLE OF CONTENTS
                                                                            Page

PRELIMINARY STATEMENT......................................................... 1

ARTICLE I                           DEFINITIONS............................... 1

         Section 1.1                Definitions............................... 1
         Section 1.2                Rules of Construction..................... 4

ARTICLE II                          ORGANIZATIONAL MATTERS.................... 5

         Section 2.1                Organization.............................. 5
         Section 2.2                Company Name.............................. 5
         Section 2.3                Principal Place of Business............... 5
         Section 2.4                Registered Agent.......................... 5
         Section 2.5                Company Purpose........................... 5
         Section 2.6                Term of Company........................... 5
         Section 2.7                Title to Property......................... 5

<PAGE>

ARTICLE III                         CAPITALIZATION............................ 5

         Section 3.1                Initial Capital Contributions of the
                                      Members................................. 6
         Section 3.2                Admission of Members...................... 6
         Section 3.3                Company Capital........................... 6

ARTICLE IV                          MANAGEMENT OF THE COMPANY; ACTS OF
                                      MEMBERS AND MEMBER MEETINGS............. 6

         Section 4.1                Management................................ 6
         Section 4.2                Voting Rights............................. 6
         Section 4.3                Management Powers......................... 6
         Section 4.5                Meetings of the Members................... 8
         Section 4.6                Limitation of Liability................... 9
         Section 4.7                Liability for Certain Acts................ 9
         Section 4.8                Reimbursement of Expenses;
                                      Compensation............................10

<PAGE>

ARTICLE V                           TRANSFERS; RESTRICTIONS ON TRANSFERS;
                                      ADDITIONAL MEMBERS .....................10

         Section 5.1                Transfer Procedures.......................10
         Section 5.2                Restrictions on Transfers; Permitted
                                      Transfers...............................10
         Section 5.3                Transfers by IMMUNOMEDICS.................11
         Section 5.4                Transfers by GOLDENBERG...................11
         Section 5.6                Additional Members........................12

ARTICLE VI                          DISSOLUTION AND WINDING UP................12

         Section 6.1                Dissolution Events........................12

ARTICLE VII                         REMEDIES FOR BREACH.......................13

         Section 7.1                Specific Enforcement......................13
         Section 7.2                Attorneys Fees and Expenses...............13

ARTICLE VIII                        AMENDMENTS................................13

<PAGE>

ARTICLE IX                          MISCELLANEOUS.............................13

         Section 9.1                Notices...................................13
         Section 9.2                Consents..................................14
         Section 9.3                Binding Effect............................14
         Section 9.4                Further Actions...........................14
         Section 9.5                Headings and Captions.....................14
         Section 9.6                Relationship of this Agreement to the
                                      Default Rules...........................14
         Section 9.7                Relationship of this Agreement and
                                      the Certificate of Formation............14
         Section 9.8                Counterparts..............................14
         Section 9.9                Creditors and Other Third Parties.........14
         Section 9.10               Governing Law.............................14
         Section 9.11               No Waiver.................................15
         Section 9.12               Integration...............................15
         Section 9.13               Severability..............................15

<PAGE>

ADDENDUM.................................................................... A-1

MEMBERSHIP ROSTER..................................................... EXHIBIT A

INITIAL CAPITAL CONTRIBUTIONS......................................... EXHIBIT B

<PAGE>


         THIS  OPERATING  AGREEMENT is entered into and shall be effective as of
March 5,  1999,  by and  between  IMMUNOMEDICS,  INC.,  a  Delaware  corporation
("IMMUNOMEDICS"),   and   DAVID   GOLDENBERG,   an   individual   ("GOLDENBERG")
(IMMUNOMEDICS and GOLDENBERG each a "Member" and sometimes collectively referred
to herein  as the  "Members"),  and IMG  TECHNOLOGY,  LLC,  a  Delaware  limited
liability company (the "Company").


                              PRELIMINARY STATEMENT

         A.       The Company was formed on February 25, 1999 by the filing of a
                  Certificate of Formation, duly executed by Tanya M. Taylor (in
                  her capacity as organizer of the Company, the "Organizer"), in
                  the  office  of  the  Secretary  of  the State of the State of
                  Delaware.  On  February  25,  1999,  the  Organizer executed a
                  Statement of the Organizer  certifying to the formation of the
                  Company  and  the  appointment  of IMMUNOMEDICS as the initial
                  Member of the Company.

         B.       The  Company  and  Coulter Corporation intend to enter into an
                  Operating   Agreement   of   IBC  Pharmaceutical,   LLC  ("IBC
                  Pharmaceutical")  (the "IBC Operating Agreement"),  as Members
                  pursuant  to  which  the  Company  will, through IMMUNOMEDICS,
                  contribute certain targeted technology to IBC Pharmaceutical.

         C.       The  parties  to  this  Agreement  wish  to  set  forth  their
                  agreements regarding the financing,  ownership, governance and
                  operation  of  the  Company.   To  reflect the foregoing,  the
                  parties hereto agree to continue  the Company on the terms and
                  conditions set forth below.


                                    ARTICLE I

                                   DEFINITIONS

         Section 1.1  Definitions. When used in this Agreement and the Addendum,
the  following  capitalized  terms  shall  have the  meanings  set forth in this
Section, unless the context otherwise requires:

         "Accountants"  means such  regionally or nationally  recognized firm of
independent public accountants as may be engaged by the Members on behalf of the
Company.

         "Act" means the Delaware Limited  Liability Company Act as set forth in
Sections  18-101 to 18-1109 of the Delaware  Code,  as amended from time to time
(or any corresponding provision or provisions of succeeding law).

<PAGE>

         "Addendum" means that addendum  annexed hereto and incorporated  herein
by  reference,  which  contains  rules of  governance  with  respect  to various
financial  matters  pertaining to the Company,  including  issues  pertaining to
allocations of profits and losses and with respect to applicable rules under the
Code and Treasury Regulations.

         "Affiliate"  means,  with  respect to any  person,  (i) any person that
directly  or  indirectly  through  one or more  intermediaries  controls,  or is
controlled by, or is under common control with, the specified  person;  (ii) any
person that is an officer of,  director of, partner in, or trustee of, or serves
in a similar  capacity  with  respect to, the  specified  person or of which the
specified person is an officer,  member or trustee, or with respect to which the
specified person serves in a similar capacity (iii) any person that, directly or
indirectly, is the beneficial owner of ten percent (10%) or more of any class of
equity  securities of the specified  person or of which the specified  person is
directly or indirectly the beneficial  owner of ten percent (10%) or more of any
class of equity  securities;  or (iv) any  relative  or spouse of the  specified
person  who  makes his home with that of the  specified  person;  except  that a
person who is a member in a company  or joint  venture  with the  Company or any
Affiliate  of the  Company is not an  Affiliate  of the Company or the Member if
such person is not otherwise an Affiliate thereof.

         "Agreement" means this operating agreement,  as originally executed and
as amended from time to time.

         "Bankruptcy" means, with respect to any Person, the (i) commencement by
such Person of a voluntary  case for relief as a debtor under the United  States
Bankruptcy  Code or the filing by such Person of a petition to take advantage of
any other present or future  insolvency act or other  applicable law relating to
bankruptcy,  insolvency,  reorganization,  or relief of debtors;  (ii) making by
such Person of an assignment for the benefit of creditors; (iii) consent by such
Person to, or  acquiescence in by such Person of, the appointment of a receiver,
liquidator,  trustee,  custodian, or other similar official of such Person or of
the whole or any substantial  part of such Person's  properties or assets;  (iv)
entering by a court of competent  jurisdiction of an order, judgment, or decree,
appointing a receiver, liquidator, trustee, custodian, or other similar official
of such  Person  or of the  whole  or any  substantial  part  of  such  Person's

                                       2
<PAGE>

properties or assets, which order,  judgment,  or decree has remained unvacated,
or not set aside, or unstayed,  for a period of not less than one hundred twenty
(120) days; (v)  commencement  of an involuntary  case against such Person under
the United States  Bankruptcy  Code, or filing against such Person of a petition
seeking similar relief under any other present or future insolvency act or other
applicable law relating to bankruptcy, insolvency,  reorganization, or relief of
debtors,  which case or petition has remained  undismissed for not less than one
hundred twenty (120) days;  (vi)  assumption,  under the provisions of any other
law for the relief or aid of debtors, by any court of competent  jurisdiction of
custody or control of such Person or the whole or any  substantial  part of such
Person's  properties or assets,  which custody or control  remains  unvacated or
unstayed for not less than one hundred  twenty (120) days;  or (vii) in the case
of a Member that is a corporation, partnership or limited liability company, the
liquidation or dissolution of such Member.

         "Business  Day" means any day on which the New York Stock  Exchange  is
neither required nor authorized to close.

         "Capital Account" means the capital account established on the books of
the Company for each Member in accordance  with the provisions of Section 2.1 of
the Addendum.

         "Capital Contribution" means, with respect to any Member, the amount of
money  and the  fair  market  value  of any  property  (other  than  money  or a
promissory note that is made by such Member and that is not readily traded on an
established  securities  market)  contributed to the Company by such Member with
respect to his interest in the Company.

         "Certificate of Cancellation" means a certificate of cancellation filed
with the Secretary pursuant to the Act to cancel the Certificate of Formation.

         "Certificate  of Formation"  means the  certificate of formation  filed
with the Secretary on February 25, 1999 in connection  with the formation of the
Company, as the same may be amended from time to time.

         "Company"  means the  limited  liability  company  formed and  operated
pursuant to the Articles of Organization and this Agreement.

         "Default  Rules" means a rule provided by the Act that (i)  structures,
defines or regulates the finances,  governance,  operations or other aspect of a
limited liability formed under the Act, and (ii) applies except to the extent it
is negated or modified through the provisions of a limited  liability  company's
articles of organization or operating agreement.

         "Delaware  Code"  means  Chapter  18,  Title  6  of  the  Delaware Code
Annotated.

         "Dissolution  Event" means an event  described in Section 7.1.  "Fiscal
Year" means (i) the period  commencing on the date of this  Agreement and ending
on the  following  December  31; (ii) any  subsequent  twelve (12) month  period
beginning  on January 1 and ending on  December  31; or (iii) any portion of the
period  described  in clauses  (i) or (ii) for which the  Company is required to
close its books and allocate  Profits (as such term is defined in the Addendum),
Losses  (as such term is  defined in the  Addendum)  and other  items of income,
gain, loss, deduction or credit.

                                       3
<PAGE>

         "Initial Capital  Contribution"  means, with respect to any Member, the
aggregate Capital  Contributions made by such member as of the effective date of
this Agreement.

         "Interest" means a Member's  membership  interest in the Company at any
given time,  including such Member's  interest in the capital and profits of the
Company.

         "Member"  means,  at any time,  any  Person who is then a member of the
Company (within the meaning of Section 102(q) of the Act).

         "Permitted  Transferee"  means,  with  respect to any  Member,  (i) his
spouse,  children  or  grandchildren,  (ii) a  trustee  of a trust  for the sole
benefit of any one or more of the persons  identified  in the  preceding  clause
(i), or (iii) any  corporation,  partnership or other entity  controlled by such
Member or any person identified in the preceding clause (i).

         "Person"   means  any   individual  or  trust,   estate,   partnership,
corporation, limited liability company or other entity.

         "Secretary"  means the Office of the Secretary of State of the State of
Delaware.

         "Transfer" means to sell,  assign,  convey,  donate,  transfer,  lease,
mortgage,  pledge, encumber or otherwise dispose of all or part of any Interest,
or to contract to do any of the foregoing.


         Section  1.2  Rules  of  Construction.  Unless  the  context  otherwise
requires,  (i) a term shall have the meaning assigned to it in Section 1.1; (ii)
an accounting term not otherwise  defined shall have the meaning  assigned to it
in accordance with generally accepted  accounting  principles;  (iii) "or" shall
not be exclusive;  (iv) words in the singular shall include the plural, and vice
versa;  (v) words in the masculine gender shall include the feminine and neuter,
and vice versa;  and (vi) any  reference to an "Article"  or  "Section,"  if not
otherwise  modified,  shall be a  reference  to an  Article  or  Section of this
Agreement.

                                       4
<PAGE>

                                   ARTICLE II

                             ORGANIZATIONAL MATTERS

         Section 2.1  Organization.   On  February  25,  1999,  a Certificate of
Formation  in  compliance  with  Section 18-201(a) of the Act was filed with the
Secretary causing the organization of the Company, effective as of said date.

         Section 2.2  Company Name.  The name of the Company is "IMG TECHNOLOGY,
LLC".

         Section 2.3  Principal Place of Business.  The principal place of
business of the Company is located at 300  American  Road,  Morris  Plains,  New
Jersey  07950.  The  Members may change the  principal  place of business of the
Company  to any other  place  within or  without  the State of New  Jersey.  The
Company  may  maintain  such  additional  offices and places of business in such
locations as the Members may deem necessary or advisable.

         Section 2.4  Registered Agent.   The  Secretary  is  designated  as the
Company's  registered  agent upon whom process against the Company may be served
within the State of Delaware. The President is authorized to appoint a successor
registered  agent or agents if the  registered  agent or agents resign or if the
Members otherwise deem it desirable to do so.

         Section 2.5  Company Purpose.   The  purposes of the Company are (i) to
engage in any lawful act or activity for which limited  liability  companies may
be formed under the Act, and (ii) to engage in any and all activities  necessary
or incidental thereto.

         Section 2.6  Term of Company.  The term of the Company commenced on the
date the Articles were filed with the Secretary and shall  continue until twelve
o'clock noon on December  31, 2050,  unless  terminated  sooner  pursuant to the
provisions of Article XII.

         Section 2.7  Title to Property.  All  property  owned  by  the  Company
shall be  owned  by the  Company  as an  entity  and no  Member  shall  have any
ownership  interest in such property in his  individual  name, and each Member's
Interest  shall be personal  property for all  purposes.  At all times after the
date of this  Agreement,  the Company shall hold title to all of its property in
its own name and not in the name of any Member.

 
                                   ARTICLE III

                                 CAPITALIZATION

         Section 3.1  Initial Capital Contributions of the Members.  The Capital
Contribution of each of the Members,  as of the date hereof,  is as set forth on
the schedule annexed hereto as Exhibit B.

                                      5
<PAGE>


         Section 3.2  Admission of Members.  The  Company  shall  not  accept  a
Capital  Contribution  on behalf of the  Company  from any person  that is not a
Member and shall not admit any such person to the Company as a Member.

         Section 3.3  Company Capital.

                  Section 3.3.1.  Interest.  The  Company  shall not be required
to pay interest on any Capital Contribution.

                  Section 3.3.2.  Returns and Withdrawals.  No Member shall have
the right to withdraw or receive any return of his Capital Contribution,  except
as expressly  provided by Section  3.3.1 and Articles IV and VI of the Addendum,
and no Capital  Contribution may be returned in the form of property (other than
money), except as specifically provided by Section 6.8 of the Addendum.



                                   ARTICLE IV

                           MANAGEMENT OF THE COMPANY;
                       ACTS OF MEMBERS AND MEMBER MEETINGS


         Section 4.1  Management.  The  overall  management of the Company shall
be vested in its  Members  and all  management  decisions  with  respect  to the
Company shall be made in accordance with Section 4.3 and 4.4.

         Section 4.2  Voting Rights.  On  matters  subject  to  a  vote  of  the
Members,  the Members shall vote in proportion with their percentage Interest in
the Company.

         Section 4.3 Management Powers. Management and control of the affairs of
the Company shall be vested in the Members. The rights and powers of the Members
shall be  exercised by them in the manner set forth  herein.  In addition to the
powers now or  hereafter  granted by law and as  otherwise  provided for in this
Agreement,  the Members for, and in the name and on behalf of the Company, shall
have the power,  either directly or through one or more  intermediaries,  to (i)
acquire by purchase,  lease or otherwise any real or personal property which may
be necessary,  convenient or incidental to the accomplishment of the purposes of
the Company;  (ii) operate,  maintain,  finance,  improve construct,  own, grant

                                       6
<PAGE>

options  with  respect to,  sell,  convey,  assign or lease any real or personal
property which may be necessary,  convenient or incidental to the accomplishment
of the purposes of the Company;  (iii) incur  indebtedness or issue evidences of
indebtedness which may be necessary,  convenient,  or incidental to the purposes
of the Company  and secure the same by  mortgage,  pledge,  or other lien on any
assets  of  the  Company;  (iv)  execute  any  and  all  agreements,  contracts,
documents,  certifications,  and instruments which may be necessary, convenient,
or incidental in connection with the acquisition, financing, operation, and sale
of any assets of the Company; (v) prepay in whole or in part, refinance, recast,
increase,  modify,  or extend any borrowings or indebtedness of the Company and,
in   connection   therewith,   to  execute   any   extensions,   consolidations,
modifications,  or renewals of any mortgages on any assets of the Company;  (vi)
perform,  or cause to be performed,  all of the Company's  obligations under any
agreement  to  which  the  Company  is a  party  or is  otherwise  bound;  (vii)
prosecute,  defend, or compromise upon such terms as they may determine and upon
such evidence as they may deem  sufficient,  any  obligation,  suit,  liability,
cause of action, claim, either in favor of or against the Company; (viii) employ
employees, agents, attorneys, auditors, accountants, and depositories and to pay
fees,  expenses,  and other  compensation  to such persons;  (ix)  establish and
maintain  reserves  for such  purposes  and in such  amounts as the Members deem
appropriate  from time to time; (x) make appropriate  elections  permitted under
applicable tax law,  provided,  however,  that such  elections  shall not in the
opinion of counsel to the Company or of the Accountants be  disadvantageous to a
majority-in-interest of the Members; and (xi) engage in any kind of activity and
perform and carry out contracts of any kind necessary to, in connection with, or
incidental  to, the  accomplishment  of the purposes of the  Company,  as may be
lawfully carried on or performed by a limited  liability  company under the laws
of the State of Delaware  and in each state where the Company has  qualified  or
does business.

         Section 4.4  Exclusive  Duty  to the Company.  Each Member shall devote
his or its full business time and attention to the business of the Company.

                                       7
<PAGE>

         Section 4.5 Meetings of the Members.

                  Section  4.5.1  Procedures.  Meetings  of the  Members  may be
called by Members possessing,  in the aggregate, at least a twenty (20%) percent
Interest in the Company.  The notice shall state the place, date and time of the
meeting, and may, but shall not be required to, state the purpose of the meeting
and the business to be transacted.  Notice of any such meeting shall be given to
all  Members  not less than ten (10)  Business  Days nor more than  thirty  (30)
Business  Days prior to the date of such  meeting.  No notice of any  meeting of
Members need be given to any Member who attends in person or is  represented  by
duly executed  proxy, or to any Member entitled to such notice who, in a writing
executed and filed with the records of the meeting,  either  before or after the
time thereof, waives such notification.  Members may vote in person, by proxy or
by telephone at such meeting and may waive advance  notice of such meeting.  The
presence in person or by proxy of a majority  in  interest of the Members  shall
constitute  a quorum for all  meetings of the  Members.  Each meeting of Members
shall be held at the  Company's  principal  place of  business  or at any  other
location set forth in the notice  thereof.  At such meetings,  the Members shall
transact such business as may properly be brought before the meeting, whether or
not notice of such meeting referenced the action taken at such meeting.

                  Section 4.5.2  Manner of Acting.  If a quorum is present, the
affirmative  vote of those Members holding a majority in interest present at the
meeting shall be the act of the Members.

                  Section 4.5.3  Record  Date.  For  the  purpose of determining
the Members  entitled to notice of, or to vote at, any meeting of the Members or
any adjournment  thereof,  the Member calling the meeting may fix, in advance of
sending of the  notice,  a date as the record  date for any such  determination.
Such date  shall not be more than  thirty  (30) days nor less than ten (10) days
before any such meeting.

                  Section 4.5.4  Proxies.  Each  Member may authorize any Person
or Persons to act for it by proxy on all  matters in which a Member is  entitled
to  participate,   including  waiving  notice  of  any  meeting,  or  voting  or
participating  at a meeting.  Every proxy must be signed on behalf of the Member
or by its  attorney-in-fact.  No proxy  shall be valid after the  expiration  of
eleven (11) months from the date thereof unless otherwise provided in the proxy.
Every proxy shall be revocable at the direction of the Member executing it.


                  Section 4.5.5  Management  of  Meetings.   A representative of
IMMUNOMEDICS shall preside at and conduct any meeting of the Members.


                                        8
<PAGE>

                  Section 4.5.6  Meetings by Conference Telephone.   Any  action
required to be taken at a meeting of the Members may be taken at a meeting  held
by means of conference telephone or other  communications  equipment by means of
which  all   Persons   participating   in  the  meeting  can  hear  each  other.
Participation  in such a meeting  shall  constitute  presence  in person at such
meeting.

                  Section 4.5.7  Actions Without a Meeting.  Any action required
or  permitted  to be taken at a meeting of the  Members  may be taken  without a
meeting by written action signed by Members who possess the percentage Interests
equal to the percentage Interests that would be required to take the same action
at a meeting of the  Members at which all  Members  were  present.  The  written
action is effective when signed by Members  possessing  the required  percentage
Interests, unless a different effective time is provided in the written action.

         Section 4.6  Limitation of Liability.   Except as otherwise required by
applicable law, no Member shall be personally liable for the debts,  obligations
or liabilities of the Company,  whether arising in tort,  contract or otherwise,
solely by reason of being a Member. A Member shall be liable only to make his or
its initial Capital Contribution, and shall not be required to lend any funds to
the Company or, after his or its initial  capital  contribution  shall have been
made, to make any further Capital  Contributions  to the Company or to repay any
Member,  or any creditor of the Company all or any part of the negative  balance
of his  Capital  Account,  provided  that a  Member  may be  required  to  repay
distributions made to it as provided in Section 18-607 of the Act.

         Section 4.7  Liability for Certain  Acts.  The Members  shall  exercise
their business judgment in managing the business, operations, and affairs of the
Company. Unless fraud, willful misconduct or gross negligence shall be proved by
a nonappealable court order,  judgment,  decree or decision,  no Member shall be
liable or otherwise  accountable in damages to the Company or any Member for any
mistake of fact or judgment or for the doing of any act or the failure to do any
act in conducting the business, operations and affairs of the Company, which may
cause or result in any loss or damage to the Company or to any Member. No Member
shall be deemed to have in any way guaranteed the return of the Members' Capital
Contributions  or a profit for the Members from the  operations  of the Company,
and no Member  shall be  responsible  to any  Member  because  of a loss of such
Member's  investment,  unless  such loss  shall  have been the  result of fraud,
willful misconduct or gross negligence of such Member.

                                        9
<PAGE>


         Section 4.8  Reimbursement of Expenses; Compensation.

                  Section 4.8.1  The Company shall reimburse each Member for the
out of pocket expenditures he may incur in managing the business of the Company,
including,  without  limitation,  travel and lodging expenses upon submission of
appropriate documentation expenses.

                  Section 4.8.2  No Member shall receive any interest, salary or
drawing  with  respect to his Capital  Contributions  or Capital  Account or for
services rendered on behalf of the Company,  or otherwise,  in his capacity as a
Member, except as otherwise provided in this Agreement.



                                    ARTICLE V

                      TRANSFERS; RESTRICTIONS ON TRANSFERS;
                               ADDITIONAL MEMBERS

         Section 5.1 Transfer Procedures. Except as otherwise expressly provided
in this  Agreement  and subject in all respects to the other  provisions of this
Article V, the transfer of any Interest  upon the books of the Company  shall be
accomplished  only  by the  submission  to the  Company  by  the  transferor  or
transferee of a duly executed and  acknowledged  counterpart  of the  instrument
making  such  transfer  together  with  such  other  instrument  or  instruments
signifying  the  transferee's  agreement to be bound by all of the provisions of
this Agreement (including but not limited to all of the transferor's obligations
hereunder),  all of the  foregoing  in such  form  and  substance  as  shall  be
reasonably  satisfactory  to  the  Company.  If  such  instruments  are  not  so
submitted,  the Company need not recognize any such transfer as being  effective
for any purpose.

         Section 5.2  Restrictions on Transfers; Permitted Transfers.

                  Section 5.2.1  General Restrictions on  Transfer.   Except  as
otherwise  permitted by this  Agreement,  no Member shall Transfer any or all of
his or its Interest without the consent of all of the other Members.

                  Section 5.2.2  Permitted  Transfers.   Subject  to  compliance
with the provisions of this Agreement,  any Member may voluntarily  Transfer all
or any part of his or its Interest to any  Permitted  Transferee.  Such Transfer
shall not be effective  unless the  transferring  Member  provides notice to the
Company  setting  forth  (i)  the  identity  of the  transferee,  and  (ii)  the
consideration,  if any, paid for the Transferred Interest at least ten (10) days
before the effective date of the Transfer.

                                       10
<PAGE>

         Section 5.3  Transfers by IMMUNOMEDICS.   IMMUNOMEDICS  may at any time
Transfer  all or any  portion  of its  Interest  pursuant  to  Section  5.1  for
consideration  to  an  unaffiliated  third  party,   subject  to  the  following
provisions:

                  (i)      Mandatory  Sale by GOLDENBERG.   In  the  event  that
IMMUNOMEDICS  intends to transfer its entire Interest to an  unaffiliated  third
party  pursuant to the  provisions  of this Section 5.3, then upon the demand of
IMMUNOMEDICS, GOLDENBERG shall be required to sell to the proposed purchaser all
of his Interest,  such sale to be made on the same terms,  conditions  and price
and at the same time as the proposed purchase from IMMUNOMEDICS.

                  (ii)  Optional  Sale  by   GOLDENBERG.   Notwithstanding   the
provisions  set forth in  paragraph  (i) of this  Section 5.3, in the event that
IMMUNOMEDICS  receives  and intends to transfer a portion of its  Interest to an
unaffiliated third party pursuant to the provisions of this Section 5.3 and such
portion of its Interest is equal to or greater than  fifty-one  (51%) percent of
the total  Interest of all  Members,  then as a condition to the closing of such
sale,  the  proposed  purchaser  shall be  required  to offer to  purchase  from
GOLDENBERG  that same  percentage of his Interest as the percentage  obtained by
multiplying  IMMUNOMEDICS'  percentage  Interest  being  sold  times the  entire
Interest then held by IMMUNOMEDICS.

         Section 5.4 Transfers by GOLDENBERG.

                  Section  5.4.1  Purchase  Option.  If at any  time  GOLDENBERG
desires to Transfer all or any portion of his Interest other than to a Permitted
Transferee pursuant to Section 5.1 for consideration, he must in any event first
provide  IMMUNOMEDICS  an opportunity to purchase his Interest,  or such portion
thereof,  by notice,  for  consideration  and upon other terms and conditions as
GOLDENBERG  shall determine.  IMMUNOMEDICS  shall have sixty (60) days after the
mailing  date of such notice in which to accept the offered  Interest by written
notice to GOLDENBERG.

                  Section  5.4.2 Failure to Exercise  Option.  In the event that
IMMUNOMEDICS  does not elect to  purchase  all or such  portion of the  Interest
offered by GOLDENBERG pursuant to Section 5.4.1,  GOLDENBERG shall be free for a
period of one (1) year after the  expiration  of the sixty  (60) day  acceptance
period,  to transfer all, but not less than all, of his offered  Interest to any
prospective  transferee for consideration and on such other terms and conditions
no more favorable to such transferee than those offered to IMMUNOMEDICS.  If the
consideration  or other terms or conditions  offered to such transferee are more
favorable  than those  offered to  IMMUNOMEDICS,  GOLDENBERG  must  re-offer the
offered Interest to IMMUNOMEDICS pursuant to the provisions of Section 5.4.1. In
the event that a Transfer of the offered  Interest is effected  pursuant to this
Section 5.4.2,  GOLDENBERG  shall,  within ten (10) days thereafter,  certify to
IMMUNOMEDICS  the identity of the transferee and that the  consideration of such
Transfer was no more favorable than that offered to IMMUNOMEDICS.

         Section 5.5  Repayment of Loans.   Whenever  the entire Interest of any
Member is purchased pursuant to the provisions of this Agreement, the purchasing
Member  or third  party may set off  against  the  first  payment  to be made on
account of the purchase  price of the Interest  purchased  hereunder  the unpaid
balance of any indebtedness owing by such Member to the Company.

                                       11
<PAGE>

         Section 5.6  Additional Members.  Additional Members may be admitted to
the Company upon (i) the unanimous written consent of all of the Members,  which
consent  may be  granted or  withheld  in their  sole  discretion,  and (ii) the
agreement  of the new  Member  in  writing  to be  bound  by the  terms  of this
Agreement.


                                   ARTICLE VI


                           DISSOLUTION AND WINDING UP


         Section 6.1  Dissolution Events.

The Company shall dissolve and shall commence  winding up and  liquidating  upon
the first to occur of any of the following events:

(i)   12:00 p.m. on December 31, 2050;

(ii)  upon  written  notice  from  the  Members  of their desire to commence the
voluntary  dissolution  of the Company,  in accordance with the terms of Section
5.3.3; or

(iii) the entry of a decree of judicial  dissolution under Section 18-802 of the
Act.

         The death, retirement, resignation, expulsion or Bankruptcy of a Member
or the occurrence of any other event which  terminates the continued  membership
of a Member in the Company shall not result in the dissolution or liquidation of
the Company and the business of the Company shall continue  notwithstanding  the
occurrence of such event. The foregoing  sentence shall be deemed to be a stated
right to continue by the Company in  conformity  with  Section  18-801(b) of the
Act.  Notwithstanding  any  provision of the Act, the Company shall not dissolve
prior to the occurrence of a Dissolution Event.

                                       12
<PAGE>


                                   ARTICLE VII

                               REMEDIES FOR BREACH

         Section 7.1  Specific Enforcement.   All breaches of this Agreement are
subject to specific enforcement,  without prejudice to the right to seek damages
or other remedies.

         Section 7.2  Attorneys Fees and Expenses.  If the Company resorts to
litigation to remedy a breach of this Agreement by a Member or former Member and
the Company  prevails  in the  litigation,  in  addition  to any other  remedies
available to the Company under this Agreement or by law, the Company may collect
its reasonable attorneys fees and expenses of litigation from such Member.


                                  ARTICLE VIII

                                   AMENDMENTS

         Members possessing at least a majority-in-interest  of the Company may,
without prior notice to or consent of any other  Member,  amend any provision of
this  Agreement;  provided,  however,  that no amendment  that has the effect of
increasing  the  liability  of any Member or  adversely  affecting  any Member's
interest in the income,  gain or loss of the Company or in cash distributions by
the  Company  may become  effective  unless  affirmatively  consented  to by all
Members who would be adversely affected thereby. Written notice of any amendment
to this  Agreement  effected  pursuant to this Article VIII shall be sent to all
Members within a reasonable period of time after its adoption.




                                   ARTICLE IX

                                  MISCELLANEOUS

         Section 9.1 Notices.  All notices  permitted or required to be given by
this Agreement shall be in writing and shall be deemed to be duly given if given
personally  with receipt  acknowledged or sent, by registered or certified mail,
return  receipt  requested,  or by fax,  or by  overnight  courier  for next day
delivery, addressed to the Company at its principal office, and addressed to the
respective  Members at their addresses set forth on the schedule  annexed hereto
as  Exhibit A,  unless  notice in writing is given of a change of address in the
manner set forth herein,  in which case notices shall be sent to the new address
so  designated.  Notice of change of address shall be deemed given when actually
received or upon refusal to accept delivery thereof;  all other notices shall be
deemed given and received on the earlier of (i) the date when actually  received
or upon refusal to accept delivery thereof,  or (ii) on the date when personally
delivered,  one (1) day after being sent by telex, fax or overnight  courier and
three (3) days after mailing, as aforesaid.

                                       13
<PAGE>

         Section 9.2  Consents.  Any  consent  required under the Agreement must
be in writing.

         Section 9.3  Binding Effect.  Subject  to  the restrictions on transfer
set forth herein, this Agreement shall be binding upon, and inure to the benefit
of, the parties hereto and their successors and assignors.

         Section 9.4  Further Actions.  Each  of  the  Members  shall  hereafter
execute  and deliver  such  further  instruments,  including  written  powers of
attorney,  and  perform  such  further  acts as may be required to carry out the
intent and purposes of the Agreement.

         Section 9.5  Headings   and   Captions.   All   headings  and  captions
contained in the Agreement and the table of contents hereto are inserted only as
a matter of convenience  and in no way define,  limit,  extend,  or describe the
scope of this Agreement or the intent of any provision hereof.

         Section 9.6  Relationship  of  this  Agreement  to  the  Default Rules.
Regardless of whether this Agreement  specifically  refers to particular Default
Rules,  (i) if any provision of this  Agreement  conflicts  with a Default Rule,
such  provision  shall control and the Default rule shall be modified or negated
accordingly;  and (ii) if it is necessary to construe a Default Rule as modified
or negated in order to  effectuate  any provision of this  Agreement,  such Rule
shall be modified or negated accordingly.

         Section 9.7  Relationship  of  this  Agreement  and  the Certificate of
Formation.  If a provision  of this  Agreement  differs  from a provision of the
Certificate of Formation,  then to the extent allowed by law this Agreement will
govern.

         Section 9.8  Counterparts.  This  Agreement  may  be executed in one or
more  counterparts  and all such  counterparts  shall  constitute  one Agreement
binding  on all  the  parties  notwithstanding  that  all  the  parties  are not
signatories to the original or the same counterpart.

         Section 9.9  Creditors and Other Third Parties.  None of the provisions
of this Agreement are made for the benefit of, or shall be  enforceable  by, any
creditor of the Company or any other Person who is not a Member.

         Section 9.10  Governing Law.  This Agreement shall, except as otherwise
expressly provided herein, be governed by, and construed in accordance with, the
laws of the State of Delaware  without regard to the conflict of laws provisions
thereof.

                                       14
<PAGE>

         Section 9.11  No Waiver. The failure of any party to insist upon strict
performance  of any  provision  hereof,  irrespective  of the length of time for
which such failure  continues,  shall not be a waiver of such  party's  right to
demand  strict  compliance in the future,  and no consent or waiver,  express or
implied, to any breach or default in the performance of any obligation hereunder
shall  constitute  a consent  or waiver to any other  breach or  default  in the
performance of the same or any other obligation hereunder.

         Section 9.12  Integration.    This  Agreement  constitutes  the  entire
agreement  among the parties with respect to the Company,  superseding  all oral
and written, prior or contemporaneous agreements, discussions,  negotiations, or
understandings.

         Section 9.13  Severability.  If any provision of this Agreement, or the
application  to any party or  circumstance,  shall be  determined  by a court of
competent  jurisdiction  to be  invalid  or  unenforceable  to any  extent,  the
remainder of this Agreement, or the application of such provision to such Person
or circumstance,  other than those as to which it is so determined to be invalid
or unenforceable, shall not be affected thereby, and each provision hereof shall
be valid and shall be enforced to the fullest extent permitted by law.

                                       15
<PAGE>


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

                                                   IMMUNOMEDICS, INC.



                                                    By: ________________________
                                                        Name: Robert J. DeLuccia
                                                  Title: Chief Executive Officer


                                                    IMG TECHNOLOGY, LLC
                                                    BY: IMMUNOMEDICS, INC.,
                                                    its sole Member


                                                    By: ________________________
                                                        Name: Robert J. DeLuccia
                                                  Title: Chief Executive Officer


                                                     ___________________________
                                                     DAVID M. GOLDENBERG



<PAGE>

                                    ADDENDUM
\
                                    ARTICLE I

                                   DEFINITIONS


         Section 1.1  Definitions.   When  used in this Addendum to that certain
Operating  Agreement of IMG TECHNOLOGY,  LLC, dated as of February 25, 1999 (the
"Agreement"),  and in the Agreement itself,  capitalized terms used herein shall
have the meanings set forth below in this Section,  unless the context otherwise
requires.  Capitalized  terms used herein but not otherwise defined herein shall
have the meaning set forth in the Agreement.

         "Adjusted Capital Account Deficit" means, with respect to any Member at
the close of any Fiscal  Year,  the  deficit  balance in such  Member's  Capital
Account at such time  (determined  by (i) crediting to such Capital  Account (x)
the amount of such Member's Deficit Restoration  Obligation at that time and (y)
the  amount  such  Member  is  deemed  to be  obligated  to  restore  under  the
penultimate  sentences  of  Sections  1.704-2(g)(1)  and  1.704-2(i)(5)  of  the
Treasury  Regulations  at such time  (determined  after  taking into account any
changes in the  Company  Minimum  Gain and Member  Minimum  Gain of the  Company
during such Fiscal  Year);  and (ii)  charging to such  Capital  Account (x) any
adjustments  described  in  Section   1.704-1(b)(2)(ii)(d)(4)  of  the  Treasury
Regulations  that,  at such time,  are  reasonably  expected  to be made to such
Member's   Capital   Account,   (y)  any   allocations   described   in  Section
1.704-1(b)(2)(ii)(d)(5)  of the Treasury  Regulations  that,  at such time,  are
reasonably  expected  to be  made  to such  Member,  and  (z) any  distributions
described in Section  1.704-1(b)(2)(ii)(d)(6)  of the Treasury Regulations that,
at such time, are reasonably expected to be made to such Member).

         "Capital Account" means the capital account established on the books of
the Company for each Member in accordance with the provisions of Section 2.1.

         "Code" means the Internal Revenue Code of 1986, as amended from time to
time (or any  corresponding  provision or provisions of any  subsequent  federal
revenue law).

         "Company  Minimum  Gain" means,  at the close of any Fiscal  Year,  the
minimum gain of the Company (determined in accordance with Section 1.704-2(i)(2)
of the Treasury Regulations).

         "Deficit  Restoration  Obligation" means, with respect to any Member at
the end of any Fiscal Year, the amount such Member is obligated to restore under
applicable  law or pursuant to any  provision of this  Agreement on account of a

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<PAGE>
deficit  balance in such  Member's  Capital  Account or is deemed  obligated  to
restore  under  Sections   1.704-2(g)(1)   and  1.704-2(i)(5)  of  the  Treasury
Regulations  (determined  after  taking into  account any changes in the Minimum
Gain and the Member Minimum Gain during such Fiscal Year).

         "Liquidator"  means the Person  appointed  by the  Members  pursuant to
Section 6.7 to oversee the liquidation of the Company.

         "Loss"  means,  for any Fiscal Year,  an amount equal to the  Company's
loss for such year, determined in accordance with Section 5.1.

         "Member  Minimum  Gain"  means an amount,  with  respect to each Member
Nonrecourse  Debt,  equal to the Company  Minimum Gain that would result if such
Member Nonrecourse Debt were treated as a Nonrecourse  Liability  (determined in
accordance with Section 1.704-2(i)(3) of the Treasury Regulations.

         "Member  Nonrecourse Debt" means any liability of the Company that is a
partner  nonrecourse  debt (as that term is defined by Section  1.704-2(b)(4) of
the Treasury Regulations).

         "Member Nonrecourse Deductions" means, for any Fiscal Year, the partner
nonrecourse  deductions of the Company for such Year  (determined  in accordance
with Section 1.704-2(i)(2) of the Treasury Regulations).

         "Net Cash Flow" means,  for any Fiscal Year,  the sum of (x) the excess
of (A) the gross cash  proceeds  received  by the  Company in such  Fiscal  Year
(including  the net cash  proceeds  from all sales and other  dispositions,  but
excluding cash proceeds  received from all borrowings or refinancing of assets),
over  (B) the  portion  of such  proceeds  used  in such  Fiscal  Year to pay or
establish  reserves  for  expenses,   capital  improvements,   debt  repayments,
replacements  and  contingencies,  and (y) any reductions in such Fiscal Year of
previously established reserves.

         "Nonrecourse  Deductions"  means,  for any Fiscal Year, the nonrecourse
deductions of the Company for such Year  (determined in accordance  with Section
1.704-2(b)(1) of the Treasury Regulations).

         "Nonrecourse  Liability"  means a liability  of the  Company  that is a
nonrecourse  liability (as that term is defined in Section  1.704-2(b)(3) of the
Treasury Regulations).

         "Profit" means,  for any Fiscal Year, the amount equal to the Company's
profit for such year, determined in accordance with Section 3.2.

                                       A-2
<PAGE>

         "Regulatory  Allocations"   means,  collectively,  the  allocations set
forth in Section 3.5.

         "Service" means the Internal Revenue Service.

         "Treasury   Regulations"   means  the  official   Treasury   Department
interpretation of the Code found in Title 26 of the Code of Federal Regulations.

         Section  1.2  Rules  of  Construction.  Unless  the  context  otherwise
requires,  (i) a term shall have the meaning assigned to it in Section 1.1; (ii)
an accounting term not otherwise  defined shall have the meaning  assigned to it
in accordance with generally accepted  accounting  principles;  (iii) "or" shall
not be exclusive;  (iv) words in the singular shall include the plural, and vice
versa;  (v) words in the masculine gender shall include the feminine and neuter,
and vice versa;  and (vi) any  reference to an "Article"  or  "Section,"  if not
otherwise  modified,  shall be a  reference  to an  Article  or  Section of this
Addendum.


                                   ARTICLE II

                       CAPITAL STRUCTURE; CAPITAL ACCOUNTS

         Section 2.1  Establishment.    A   single   Capital  Account  shall  be
established  on the  books of the  Company  for  each  Member.  Initial  Capital
Accounts shall be as set forth on Exhibit B.

         Section 2.2  Maintenance  of  Capital  Accounts.   The  Capital Account
established  for any Member shall be maintained in accordance with the following
rules.

                  Section 2.2.1 Basic Rules. The Capital Account established for
any Member shall be (i) credited with (A) such Member's  Capital  Contributions,
(B) such  Member's  allocable  share of  Profits  and any items in the nature of
income or gain that are specially allocated pursuant to Section 3.3, and (C) the
amount of any Company liabilities assumed by such Member or which are secured by
any property  distributed  to such Member by the Company;  and (ii) charged with
(A) the  amount  of money  and the  gross  fair  market  value  of any  property
distributed to such Member pursuant to any provision of this Agreement, (B) such
Member's  allocable  share of Losses  and any items in the  nature of expense or
loss that are specially  allocated pursuant to Section 3.3 of the Addendum,  and
(C) the amount of such Member's  liabilities  assumed by the Company or that are
secured by any property contributed to the Company by such Member.

                                       A-3
<PAGE>

                  Section 2.2.2 Treatment  of  Liabilities.   The  amount of any
liability  shall be  determined  for  purposes  of this  Section 2.2 taking into
account  Section 752(c) of the Code and any other  applicable  provisions of the
Code and the Treasury Regulations.

                  Section 2.2.3  Treatment of Certain Promissory Notes.  If a
promissory  note (other than a note that is readily  tradeable on an established
securities  market) is contributed to the Company by the person who is the maker
of such note, such person's  Capital Account shall be credited on account of the
contribution of such note only when there is a taxable  disposition of such note
by the Company or when the maker makes principal payments on such note.

         Section 2.3  Revaluations  of Property.  The book values of all Company
assets shall be adjusted to their  respective gross fair market values as of the
following times: (i) the acquisition of an additional interest in the Company by
any new or  existing  Member in  exchange  for more than a de minimis  amount of
money or other  property;  (ii) the  distribution  by the Company to a Member of
more than a de minimis amount of money or other property as consideration for an
interest in the Company;  and (iii) the  liquidation  of the Company  within the
meaning of Section  1.704-1(b)(2)(ii)(g) of the Treasury Regulations,  provided,
however,  that  adjustments  made at the times described in clauses (i) and (ii)
hereof  shall  be made  only  if the  Members  reasonably  determine  that  such
adjustments  are  necessary  or  appropriate  to reflect the  relative  economic
interests  of the Members.  The Members  shall  determine  the gross fair market
values of all Company assets pursuant to this Section 2.3.

         Section 2.4 Certain Other  Adjustments to Book Values of Property.  The
gross fair market  value of all Company  assets shall be adjusted to reflect any
adjustments  to the tax  bases of such  assets  pursuant  to  Section  743(b) or
Section  734(b) of the Code,  but only to the extent that such  adjustments  are
taken  into  account  in  determining   Capital  Accounts  pursuant  to  Section
1.704-1(b)(2)(iv)(m) of the Treasury Regulations and Section 3.1(vii) or Section
3.5.5;  provided,  however,  that such  gross  fair  market  value  shall not be
adjusted  pursuant to this Section 2.4 to the extent an  adjustment  pursuant to
Section 2.3 is required in connection  with a transaction  that would  otherwise
result in an adjustment pursuant to this Section 2.4.

         Section  2.5  Compliance  with  Applicable  Treasury  Regulations.  The
provisions of this Article II are intended to comply with Section  1.704-1(b) of
the  Treasury  Regulations  and shall be  interpreted  and  applied  in a manner
consistent with such provision. In the event that the Members holding a majority
of  the  percentage  Interest  in  the  Company,  after  consultation  with  the
Accountants,  determine that it is prudent to modify the manner in which Capital

                                       A-4
<PAGE>

Accounts, or any credits or charges thereto are computed in order to comply with
such Section, they may make such modification, provided it is not likely to have
a material effect on the amounts distributable to any Member pursuant to Section
6.1 upon  liquidation of the Company.  The Company shall (i) after  consultation
with  the  Accountants,   make  any  adjustments  that  it  deems  necessary  or
appropriate to maintain equality between the Capital Accounts of the Members and
the amount of Company  capital  reflected on the  Company's  balance  sheet,  as
computed for book purposes, in accordance with Section  1.704-1(b)(2)(iv)(q)  of
the Treasury Regulations;  and (ii) make any other appropriate  modifications in
the event  unanticipated  events might  otherwise  cause this  Agreement  not to
comply with Section 1.704-1(b) of the Treasury Regulations.

         Section  2.6  Transfers  of  Interests.  If in any Fiscal Year a Member
transfers any or all of its Interest, then such Member's Capital Account (or the
portion thereof  attributable  to the transferred  Interest) shall carry over to
the transferee. If such transfer causes a termination of the Company for federal
income tax purposes,  the  constructive  reformation of the Company  shall,  for
purposes  of this  Article  II, be treated  as the  formation  of a new  limited
liability  company and the Capital  Accounts of the Members  shall be determined
and maintained accordingly.


                                   ARTICLE III

                           COMPUTATION AND ALLOCATION
                                       OF
                             FINANCIAL AND TAX ITEMS

         Section 3.1  Computation of Profit and Loss.  The Profit (or Loss) of
the  Company  for any  Fiscal  Year  shall be an amount  equal to the  Company's
taxable  income (or loss) for such  Fiscal Year  (computed  in  accordance  with
Section 703(a) of the Code), with the following adjustments:

                  (i) any income of the  Company  for such  Fiscal  Year that is
exempt from federal income tax and not otherwise taken into account in computing
Profit (or Loss) under this  Section 3.1 shall be added to such  taxable  income
(or loss);

                  (ii) any expenditure  described in Section 705(a)(2)(B) of the
Code for such Fiscal Year not otherwise  taken into account in computing  Profit
(or Loss) under this Section 3.1 shall be  subtracted  from such taxable  income
(or loss);

                                       A-5
<PAGE>

                  (iii) in the  event the book  value of any  asset is  adjusted
pursuant  to  Section  2.3,  the amount of such  adjustment  shall be taken into
account  as gain or loss from the  disposition  of such  asset for  purposes  of
computing the Profit (or Loss);

                  (iv)  any  gain  or loss resulting from the disposition during
such  Fiscal Year of any asset (in a taxable  transaction)  shall be computed by
reference to the book value of such asset;

                  (v)  in  lieu  of  the  depreciation  (or  cost  recovery)  or
amortization  with  respect to any asset taken into  account in  computing  such
taxable  income (or loss),  there shall be taken into account  depreciation  (or
cost recovery) or amortization  in respect of such asset  determined by applying
the method used by the Company for federal  income tax purposes  with respect to
such asset to the book value of such asset (or if the tax basis of such asset is
zero at the  beginning of such Fiscal Year,  by applying any  reasonable  method
selected by the Members);

                  (vi)  any items in the nature of income, gain, expense or loss
that are specially allocated pursuant to  Sections 3.4 or 3.5 shall not be taken
 into account; and

                  (vii) to the  extent  an  adjustment  to the tax  basis of any
Partnership  asset  pursuant to Section  734(b) or Section 743(b) of the Code is
required pursuant to Section 1.704-1(b)(2)(iv)(m)(4) of the Treasury Regulations
to be taken  into  account  in  determining  Capital  Accounts  as a result of a
distribution  other than in complete  liquidation  of a Member's  interest,  the
amount of such adjustment shall be treated as an item of gain (if the adjustment
increases the basis of the asset) or loss (if the adjustment decreases the basis
of the asset) from the  disposition of the asset and shall be taken into account
in computing Profit (or Loss).

The amount of the items in the nature of income, gain, expense or loss available
to be  specially  allocated  pursuant  to Section  3.4 and  Section 3.5 shall be
determined by applying rules analogous to those set forth in this Section 3.1.

         Section 3.2  Allocation of Profit.

                  Section 3.2.1  Operating Profit.   Profits for any Fiscal Year
(determined  without  taking into account any item of gain  attributable  to the
sale or  exchange of any asset by the  Company or by IBC  Pharmaceutical  [other

                                       A-6
<PAGE>

than a sale or  exchange  made in the  ordinary  course of  business])  shall be
allocated to the Members as follows:

                  (i)  first, to the Members in proportion to and to the extent
of the excess,  if any, of (x) the  aggregate  amount of Loss  allocated to each
such Member for all prior Fiscal Years pursuant to Section  3.3.2,  over (y) the
aggregate  amount of Operating  Profit allocated to such Member pursuant to this
Section  3.2.1(i) for all prior Fiscal  Years and the  aggregate  amount of gain
allocated  to such Member  pursuant  to Section  3.2.2(i)  for all prior  Fiscal
Years; and

                  (ii)  second,  to  the  Members  in  proportion  to and to the
extent of the excess,  if any, of (x) the aggregate  amount of Loss allocated to
each such Member for all prior Fiscal Years pursuant to Section 3.3.1,  over (y)
the aggregate  amount of Operating  Profit  allocated to such Member pursuant to
this Section 3.2.1(ii) for all prior Fiscal Years; and

                  (iii) the remainder,  eighty (80%) percent to IMMUNOMEDICS and
twenty (20%) percent to GOLDENBERG.

                  Section 3.2.2  Gain on Disposition.  Any item of gain that is
taken into account in computing  Profit for any Fiscal Year that is attributable
to the sale or  exchange  of any asset by the  Company or by IBC  Pharmaceutical
(other than a sale or exchange made in the ordinary course of business) shall be
allocated as follows:

                  (i)  first, to the Members in proportion to and to the extent
of the excess,  if any, of (x) the  aggregate  amount of Loss  allocated to such
Member  pursuant to Section  3.3.2 for all Fiscal Years  (including  the current
Fiscal  Year),  over (y) the sum of the  aggregate  amount of Operating  Profits
allocated to such Member pursuant to Section 3.2.1(i) for all prior Fiscal Years
and the  aggregate  amount of gain  allocated  to such  Member  pursuant to this
Section 3.2.2(i) for all prior Fiscal Years;

                  (ii) then to  GOLDENBERG  until the  aggregate  amount of gain
allocated to him pursuant to this Section  3.2.2(ii)  with respect to such asset
equals  twenty-five (25%) percent of the book value of such asset at the time of
sale or  exchange,  provided  that the  aggregate  amount of gain  allocated  to
GOLDENBERG pursuant to this Section 3.2.2(ii) does not exceed $4,662,000; and

                                       A-7
<PAGE>

                  (iii) the remainder,  eighty (80%) percent to IMMUNOMEDICS and
twenty (20%) percent to GOLDENBERG.

         Section 3.3  Allocation of Loss.

                  Section 3.3.1  General Rule. Loss for any Fiscal Year shall be
allocated eighty percent to IMMUNOMEDICS and twenty (20%) percent to GOLDENBERG.

                  Section 3.3.2  Special  Limitation.   Loss  allocated  to  the
Members  for any Fiscal  year  pursuant  to Section  3.3.1  shall not exceed the
maximum amount of such Loss that can be so allocated  without causing any Member
to have an Adjusted  Capital  Account Deficit at the end of such Fiscal Year. In
the event  some but not all of the  Members  would  have such  Adjusted  Capital
Account  Deficits as a  consequence  of an  allocation of Loss for a Fiscal Year
pursuant to Section  3.3.1,  the  limitation  set forth in the first sentence of
this Section  3.3.2 shall be applied so as to allocate  the maximum  permissible
amount of such Loss to each Member  under  Section  1.704-1(b)(2)(ii)(d)  of the
Treasury Regulations.

         Section 3.4 Unanticipated  State of Facts. If an unanticipated state of
facts arises  (including a change in the federal income tax treatment of company
allocations),  the allocations and  determinations  governed by this Article III
shall be made by the  Members  so as to carry out as nearly as  practicable  the
purposes of this  Article  III,  namely,  to give  cumulative  recognition  when
allocating  tax  items  to  differences  between  the  Fiscal  Year  in  which a
transaction or item is recognized for purposes of determining Profit or Loss and
the taxable year in which it affects taxable income.

         Section 3.5  Special  Allocations.  The  following  special allocations
 shall be  made in the following order:

                  Section  3.5.1  Minimum Gain  Chargeback.  Except as otherwise
provided by Section  1.704-2(f) of the Treasury  Regulations,  if there is a net
decrease in the Company  Minimum  Gain  during any Fiscal  Year,  there shall be
allocated to each Member (before any other allocation is made under this Section
3.5)  items of  income  and  gain  for such  Fiscal  Year  (and,  if  necessary,
subsequent  periods) in proportion  to, and to the extent of, an amount equal to
such  Member's  share of the net  decrease in Company  Minimum  Gain during such
Fiscal Year  (determined in accordance  with Section  1.704-2(g) of the Treasury
Regulations).  The items to be allocated  for any Fiscal year under this Section
3.5.1 shall be  determined  in  accordance  with  Section  1.704-2(j)(2)  of the
Treasury Regulations.

                                       A-8
<PAGE>

                  Section  3.5.2  Member  Minimum  Gain  Chargeback.  Except  as
otherwise  provided by Section  1.704-2(i)(4)  of the Treasury  Regulations,  if
during  any Fiscal  Year there is a net  decrease  in the  Member  Minimum  Gain
attributable to a Member  Nonrecourse Debt, there shall be allocated (before any
allocation  for such  Fiscal  Year is made under this  Section  3.5 (other  than
Section  3.5.1))  to  each  Member  with a  share  of the  Member  Minimum  Gain
attributable  to such  Member  Nonrecourse  Debt (as  determined  under  Section
1.704-2(i)(5)  of the  Treasury  Regulations)  items of income and gain for such
Fiscal Year (and, if necessary,  for subsequent  Fiscal Years) in proportion to,
and to the extent of such Member's share of the net decrease  during such Fiscal
Year in the Member Minimum Gain  attributable  to such Member  Nonrecourse  Debt
(determined under Section 1.704-2(i)(4) of the Treasury Regulations).  The items
to be allocated for any Fiscal Year under this Section 3.5.2 shall be determined
in accordance with Section 1.704-2(j)(2) of the Treasury Regulations.

                  Section  3.5.3   Qualified   Income  Offset.   If  any  Member
unexpectedly receives any adjustments, allocations or distributions described in
Section  1.704-1(b)(2)(ii)(d)(4),  Section  1.704-1(b)(2)(ii)(d)(5)  or  Section
1.704-1(b)(2)(ii)(d)(6)  of the  Treasury  Regulations  during any Fiscal  Year,
there shall be allocated  (before any  allocation is made under this Section 3.5
(other than  Sections  3.5.1 or Section  3.5.2)) to such Member items of Company
income and gain for such  Fiscal  Year (and,  if  necessary,  subsequent  Fiscal
Years) in an amount and manner  sufficient to eliminate,  to the extent required
by the Treasury Regulations, the Adjusted Capital Account Deficit of such Member
as quickly as possible,  provided  that an  allocation  pursuant to this Section
3.5.3  shall be made only if and to the extent  that such  Member  would have an
Adjusted  Capital Account Deficit after all other  allocations  provided in this
Section 3.5 have been  tentatively made as if this Section 3.5.3 were not in the
Agreement.  Any allocation of income or gain for any Fiscal Year made under this
Section 3.5.3 shall consist of a pro rata portion of each item of Company income
(including gross income) and gain for such period (other than income or gain for
such period allocated under Sections 3.5.1 or 3.5.2).

                  Section 3.5.4 Gross Income  Allocation.  If there is a deficit
balance in the Capital Account of any Member at the end of any Fiscal Year which
is in excess of the amount of such Member's  Deficit  Restoration  Obligation at
that time, each such Member shall be specially allocated items of Company income
and gain in the amount of such excess as quickly as possible,  provided  that an

                                       A-9
<PAGE>

allocation  to the Capital  Account of a Member  pursuant to this Section  3.5.4
shall be made only if and to the extent that such Member  would have an Adjusted
Capital Account Deficit in excess of such Deficit  Restoration  Obligation after
all other  allocations  provided  for in this  Section  3.5 have been made as if
Section 3.5.3 and this Section 3.5.4 were not in the Agreement.

                  Section  3.5.5  Section  754  Adjustments.  To the  extent  an
adjustment to the tax basis of any Company asset  pursuant to Section  734(b) or
Section    743(b)   of   the   Code   is    required    pursuant    to   Section
1.704-1(b)(2)(iv)(m)(2)  or  Section  1.704-1(b)(2)(iv)(m)(4)  of  the  Treasury
Regulations  to be taken into  account in  determining  Capital  Accounts as the
result of a  distribution  to a Member in complete  liquidation of such Member's
Interest or as the result of the sale of a Member's Interest, the amount of such
adjustment  to  Capital  Accounts  shall be  treated  as an item of gain (if the
adjustment  increases  the  basis  of the  asset)  or loss  (if  the  adjustment
decreases such basis) and such gain or loss shall be specially  allocated to the
Members in accordance  with their  interests in the Company in the event Section
1.704-1(b)(2)(iv)(m)(2)   of  the  Treasury   Regulations  applies,  or  to  the
distributee  in the  event  Section  1.704-1(b)  (2)(iv)(m)(4)  of the  Treasury
Regulations applies.

                  Section 3.5.6  Nonrecourse Deductions.  Nonrecourse Deductions
for any Fiscal Year shall be allocated as  determined by the Members in a manner
that is consistent  with the  principles of Sections  1.704-1 and 1.704-2 of the
Treasury Regulations.

                  Section 3.5.7  Member  Nonrecourse   Deductions.   Any  Member
Nonrecourse  Deductions for any Fiscal Year shall be allocated to the Member who
bears the economic risk of loss with respect to the Member  Nonrecourse  Debt to
which such Member  Nonrecourse  Deductions are  attributable  in accordance with
Section 1.704-2(i)(1) of the Treasury Regulations.

         Section 3.6 Curative Allocations.  All Regulatory  Allocations shall be
offset either with other Regulatory  Allocations or with special  allocations of
items in the nature of income,  gain,  expense, or loss pursuant to this Section
3.6.  The  Company  shall  make  such  offsetting  special  allocations  in  its
discretion so that,  after such  offsetting  allocations are made, each Member's
Capital Account balance is, to the extent possible, equal to the Capital Account
balance such Member would have had if the Regulatory  Allocations  were not part
of the Addendum and all Company items were allocated pursuant to Section 3.2 and
Section 3.3 of the Agreement.  In exercising  its discretion  under this Section
3.6, the Company shall take into account  future  Regulatory  Allocations  that,
although  not yet  made,  are  likely  to offset  other  Regulatory  Allocations
previously made.

         Section 3.7  Allocation of Tax Items.  For federal and state income tax
purposes, Company income gain, loss, deduction and credit (or items thereof) for
any Fiscal Year shall be allocated as follows:

                                      A-10
<PAGE>

                  Section 3.7.1  General Rule.   Except  as provided in Sections
3.7.2,  3.7.3 and 3.7.4, all items of income,  gain, loss,  deduction and credit
shall be allocated  in the same manner as the  correlative  items are  allocated
under Sections 3.2 and 3.3.

                  Section 3.7.2 Section 704(c) Considerations.  Items of income,
gain, loss and deduction with respect to any asset contributed to the capital of
the  Company  shall,  solely for income tax  purposes,  be  allocated  among the
Members so as to take account of any  variation  between the  adjusted  basis of
such asset to the  Company for federal  income tax  purposes  and the gross fair
market  value of such asset at the time of  contribution.  In the event the book
value of any asset  contributed to the capital of the Company is revalued on the
Company's books, subsequent allocations of income, gain, loss and deduction with
respect to such asset shall take account of any  variation  between the adjusted
basis of such asset to the Company for federal  income tax purposes and the book
value of such asset immediately following such revaluation in the same manner as
under Section 704(c) of the Code and the Treasury  Regulations  thereunder.  Any
elections  or other  decisions  relating to  allocations  made  pursuant to this
Section  3.7.2  shall  be made by the  Members  in any  manner  that  reasonably
reflects the purposes and intentions of this Agreement.

                  Section 3.7.3 Recapture  Income.  For purposes of deter-mining
the character (as ordinary  income or capital gain) of any taxable income of the
Company,  such portion of the taxable  income of the Company which is treated as
ordinary income attributable to the recapture of depreciation (or cost recovery)
shall,  to the  extent  possible,  be  allocated  among  the  Member  (or  their
successors in interest) in the same  proportions  that the depreciation (or cost
recovery)  deductions  directly  or  indirectly  giving rise to such income were
previously  allocated.  This  Section  3.7.3  shall  not  alter  the  amount  of
allocations to any Member but merely the character of income so allocated.

                  Section 3.7.4  Transfers of Company Interests.   If during any
taxable year of the Company  there is a change in any  Member's  interest in the
Company,  then each Member's  distributive share of each item of Company income,
gain,  loss and deduction shall be determined for federal income tax purposes as
if the  taxable  year of the  Company  closed  on the date of such  change.  For
purposes of this  Section  3.7.4,  a transfer of an interest in the Company made
during the first fifteen (15) days of any calendar  month will be deemed to have
been  effected at the opening of month,  and a transfer made after the fifteenth
day of any calendar month will be deemed to have been effected at the opening of
the following month.

                                      A-11
<PAGE>


                                   ARTICLE IV

                                  DISTRIBUTIONS

         Section 4.1  Distributions.   Except  as  otherwise provided by Section
6.1,

                  Section 4.1.1 Distributable.  Distributable cash (as the same
is determined by the Company at its sole  discretion) at the close of any Fiscal
Year shall be distributed  eighty (80%) percent to IMMUNOMEDICS and twenty (20%)
percent to GOLDENBERG.

                  Section 4.1.2  Special Limitation. Distributions made pursuant
to Section 4.1.1 shall not exceed the maximum amount that can be so made without
causing any Member to have an deficit Capital Account balance. In the event some
but not all of the  Members  would  have such  deficits  as a  consequence  of a
distribution  pursuant to Section  4.1.1,  the limitation set forth in the first
sentence of this Section 4.1.2 shall be applied on a  Member-by-Member  basis so
as to distribute the maximum permissible amount to each Member.

         Section 4.2 [ Intentionally Omitted ]

         Section 4.3  Amounts Withheld.

                  Section  4.3.1  Amounts  Withheld  on Behalf  of  Governmental
Authority.   All  amounts  withheld  pursuant  to  the  Code  and  the  Treasury
Regulations  or any  provision  of any  state or local tax law or the law of any
foreign   country  or   subdivision   thereof   with  respect  to  any  payment,
distribution,  or  allocation  to the Company or the Members shall be treated as
amounts  distributed  to the Members  pursuant to Section 4.1 or Section 4.2 for
all purposes  under this  Agreement.  The Company is authorized to withhold from
distributions, or with respect to allocations, to the Members and to pay over to
any federal, state, or local government or foreign government or any subdivision
thereof  any  amounts  required  to be so  withheld  pursuant to the Code or any
provisions of any other federal,  state,  or local law or the law of any foreign
country or  subdivision  thereof and shall  allocate such amounts to the Members
with respect to which such amount was withheld.

         Section 4.4  Liability  for  Distributions.   A  Member  who receives a
distribution  for the Company shall have no liability under the Act or any other
applicable  law for the amount of the  distribution  after the expiration of six
(6) years  from the date of the  distribution  unless an action to  recover  the
distribution  from such member is commenced prior to the expiration of such six-
(6-) year period and an adjudication of liability against such Member is made in
such action.

                                      A-12
<PAGE>

         Section 4.5  Distributions  in  Kind.  The Company shall have the right
to compel a Member to accept a distribution of any asset in kind, whether or not
the percentage of the asset distributed to it exceeds a percentage of that asset
which is equal to the  percentage in which it shares in  distributions  from the
Company.


                                    ARTICLE V


                                BOOKS OF ACCOUNT;
                      FINANCIAL STATEMENTS; FISCAL MATTERS

         Section 5.1  Accounting, Books and Records.

                  Section 5.1.1  Required  Records.   The  Members shall keep on
site at the principal place of business of the Company each of the following:

                  (i)  separate books of account for the Company which shall
show a true and accurate record of all costs and expenses incurred,  all charges
made,  all  credits  made and  received,  and all income  derived in  connection
therewith and the operation thereof accordance with this Agreement;

                  (ii) a current list of the full name and last known  business,
residence, or mailing address of each Member, both past and present;

                  (iii)  a  copy  of   the  Articles  of  Organization  and  all
 amendments thereto, together with executed copies of any powers of attorney
 pursuant to which any amendment has been executed;

                  (iv) copies of the Company's federal,  state, and local income
tax returns and reports, if any, for the three most recent years;

                  (v)  copies of this Agreement; and

                  (vi)  any  minutes  of meetings of the Members and any written
consents  obtained  from  Members  pursuant  to  Section  407 of the Act and the
Agreement regarding action taken by Members without a meeting.

                  Section 5.1.2  Accounting  Matters.   The  books of account of
the Company shall be kept on a calendar year basis in accordance  with generally
accepted  accounting  principles.  The Company shall, to the extent permitted by

                                      A-13
<PAGE>

the Code, compute its income (and items thereof) for federal income tax purposes
on the basis of the calendar year using the cash method of accounting.

                  Section 5.1.3  Access  to  Records.   After  giving reasonable
advance  written notice to the Company  stating under oath the purpose  thereof,
any Member may inspect and review the Company Records for any proper purpose and
may, at the Member's expense, have the Company make copies of any portion or all
of the Company Records. A proper purpose shall mean a purpose reasonably related
to such person's interest as a Member. Unless the Company agrees otherwise,  all
Member  access to the  Company  Records  must take place  during  the  Company's
regular business hours. The Company may impose additional  reasonable conditions
and restrictions on Members' access to the Company Records, including specifying
the amount of advance  notice a Member  must give and the  charges  imposed  for
copying.

         Section 5.2  Reports.

                  Section 5.2.1  Generally.   The Treasurer of the Company shall
be responsible for causing the  preparation of financial  reports of the Company
and the coordination of financial matters of the Company with the Accountants.

                  Section 5.2.2  Annual Reports. Within one hundred eighty (180)
days after the close of each Fiscal Year,  the Company shall send to each Person
who was a Member at any time during the Fiscal Year then ended the  consolidated
balance  sheet  of the  Company  as of the  close of such  Year and the  related
consolidated  statements  of income,  changes in Members'  equity and changes in
financial  position for such Fiscal Year. Such  consolidated  balance sheets and
statements need not be audited.

         Section 5.3  Tax Matters.

                  Section 5.3.1 Tax Elections.  IMMUNOMEDICS shall,  without any
further  consent of the Members being  required,  make any and all elections for
federal,  state,  local,  and foreign tax purposes,  including any election,  if
permitted  by  applicable  law (i) to adjust the basis of the  Company's  assets
pursuant  to  Sections  754,  734(b)  and  743(b)  of the  Code  (or  comparable
provisions  of state,  local or  foreign  law);  (ii) to extend  the  statute of
limitations for assessment of tax deficiencies  against the Members with respect
to adjustments to the Company's  federal,  state,  local or foreign tax returns;
and (iii) to the extent  provided in Sections  6221 through 6231 of the Code and
similar  provisions of federal,  state,  local, or foreign law, to represent the
Company  and the  Members  before  taxing  authorities  or courts  of  competent

                                      A-14
<PAGE>
jurisdiction  in tax  matters  affecting  the  Company  or the  Members in their
capacities as Members, and to file any tax returns and execute any agreements or
other documents relating to or affecting such tax matters,  including agreements
or other  documents  that bind the Members  with  respect to such tax matters or
otherwise affect the rights of the Company and the Members.

                  Section 5.3.2  Tax Information. The Company shall use its best
efforts to send, within ninety (90) days after the close of each Fiscal Year, to
each Person who was a Member at any time during the Fiscal Year then ended, such
tax  information  (including  a  Schedule  K-1) as  shall be  necessary  for the
preparation  by such Person of his or her federal and state  income tax returns,
and any other tax return  required by any  jurisdiction  in which the Company is
formed or qualified to conduct business.

         Section 5.4 Tax Matters  Partner.  IMMUNOMEDICS  shall serve as the tax
matters  partner of the Company within the meaning of Section  6231(a)(7) of the
Code  and the  Treasury  Regulations  promulgated  thereunder  for  purposes  of
representing the Company in administrative  proceedings  relating to the federal
income tax  treatment of items of Company  income,  gain,  loss,  deduction,  or
credit.  In its capacity as the tax matters partner of the Company,  such Member
shall have all authority  granted to a tax matters partner by the Code and shall
have the  right,  at  Company  expense,  to retain  professional  assistance  in
connection with any audit of the Company by the Service.

                                      A-15
<PAGE>


                                   ARTICLE VI

                         TAX AND FINANCIAL CONSEQUENCES
                          OF DISSOLUTION OF THE COMPANY

         Section 6.1 Winding Up. Upon the occurrence of a Dissolution Event, the
Company shall  continue  solely for the purposes of winding up its affairs in an
orderly  manner,  liquidating  its  assets,  and  satisfying  the  claims of its
creditors and Members,  and no Member shall take any action that is inconsistent
with,  or not necessary to or  appropriate  for, the winding up of the Company's
business and affairs, provided that all covenants contained in the Agreement and
this  Addendum and  obligations  provided for in the Agreement and this Addendum
shall  continue to be fully  binding upon the Members  until such time as all of
the Company's assets have been distributed  pursuant to this Section 6.1 and the
Articles of Dissolution  have been filed in accordance with the Act. The Members
shall be  responsible  for  supervising  the winding up and  dissolution  of the
Company, which winding up and dissolution shall be completed as expeditiously as
possible.  The Members shall take full account of the Company's  liabilities and
assets and shall  cause its assets or the  proceeds  from the sale  thereof  (as
determined  pursuant to Section 6.8), to the extent sufficient  therefor,  to be
applied  and  distributed,  to the  maximum  extent  permitted  by  law,  in the
following order:

                  (i)  first, to creditors (including Members who are creditors,
to  the  extent  otherwise  permitted  by  law)  in  satisfaction  of all of the
Company's  debts and other  liabilities  (whether  by  payment  or the making of
reasonable  provision for payment  thereof),  other than  liabilities  for which
reasonable  provision for payment has been made and liabilities for distribution
to members under Section 507 or Section 509 of the Act;

                  (ii)  second, except as provided in this Agreement, to Members
and  former  Members  of  the  Company  in   satisfaction   of  liabilities  for
distribution under Sections 507 or 509 of the Act; and

                  (iii)  the balance, if any,  to the Members in accordance with
the  positive  balance  in  Capital   Accounts,   after  giving  effect  to  all
contributions, distributions and allocations for all periods.

No Member shall  receive  additional  compensation  for any  services  performed
pursuant to this Section 6.1.

         Section  6.2  Compliance  with  Certain  Requirements  of  Regulations;
Deficit Capital  Accounts.  In the event the Company is "liquidated"  within the
meaning of Regulations Section 1.704-1(b)(2)(ii)(g),  (i) distributions shall be
made  pursuant to this  Section 6.2 to the  Members  who have  positive  Capital

                                      A-16
<PAGE>
Accounts in  compliance  with  Section  1.704-1(b)(2)(ii)(B)(2)  of the Treasury
Regulations.  If any Member has a deficit  balance in his Capital Account (after
giving effect to all contributions, distributions and allocations for all Fiscal
Years,  including the Fiscal Year during which such  liquidation  occurs),  such
Member shall have no obligation to make any  contribution  to the capital of the
Company with respect to such deficit, and such deficit shall not be considered a
debt owed to the Company or to any other Person for any purpose  whatsoever.  In
the discretion of the Liquidator,  a pro rata portion of the distributions  that
would otherwise be made to the Members pursuant to this Article VI may be:

                  (i) distributed to a trust  established for the benefit of the
         Members for the  purposes of  liquidating  Company  assets,  collecting
         amounts owed to the Company,  and paying any  contingent  or unforeseen
         liabilities  or obligations  of the Company and  distributed  from such
         trust to the Members from time to time, in the reasonable discretion of
         the Liquidator,  in the same  proportions as the amount  distributed to
         such trust by the Company would otherwise have been  distributed to the
         Members pursuant to Section 6.1; or

                  (ii)  withheld  to  provide  a  reasonable reserve for Company
         liabilities  (contingent  or  otherwise)  and to reflect the unrealized
         portion  of any  installment obligations  owed to the Company, provided
         that such withheld amounts shall be  distributed to the Members as soon
         as practicable.

         Section 6.3 Deemed Distribution and Recontribution. Notwithstanding any
other  provision  of this  Article  VI, in the event the  Company is  liquidated
within the meaning of Section 1.706-1  (b)(2)(ii)(g) of the Treasury Regulations
but no Dissolution Event has occurred, the Company shall not be liquidated,  the
Company's debts and other liabilities  shall not be paid or discharged,  and the
Company's  affairs shall not be wound up. Instead,  soley for federal income tax
purposes,  the Company  shall,  to the extent  required by  applicable  Treasury
Regulations,  be deemed to have  contributed its assets in-kind to a new limited
liability  company,  which shall be deemed to have taken such assets  subject to
all debts of the  Company  and other  liabilities,  in  exchange  for all of the
ownership  interests in that new company.  Immediately  thereafter,  the Company
shall, to the extent required by applicable Treasury  Regulations,  be deemed to
have distributed such interests in-kind to the Members.

         Section 6.4  Rights of Members.   Except  as otherwise provided in this
Agreement,  each  Member  shall look solely to the assets of the Company for the

                                      A-17
<PAGE>
return  of his  Capital  Contribution  and has no right or  power to  demand  or
receive  assets other than cash from the  Company.  If the assets of the Company
remaining  after payment or discharge of the debts or liabilities of the Company
are insufficient to return such Capital Contribution,  the Members shall have no
recourse against the Company or any other Member.

         Section 6.5 Notice of Dissolution/Termination.

                  Section 6.5.1  In  the  event  a Dissolution Event occurs, the
Liquidator  shall,  within thirty (30) days  thereafter,  provide written notice
thereof to each of the  Members and to all other  parties  with whom the Company
regularly  conducts  business and shall publish notice thereof in a newspaper of
general  circulation  in each  place in which  the  Company  regularly  conducts
business.

                  Section 6.5.2  Upon  completion  of  the  distribution  of its
assets as provided in this Article VI, the Company shall be terminated,  and the
Liquidator  shall cause the filing of the  Articles of  Dissolution  pursuant to
Section 705 of the Act and shall take all such other actions as may be necessary
to terminate the Company.

         Section 6.6  Allocations  During  Period  of  Liquidation.   During the
period commencing on the first day of the Fiscal Year during which a Dissolution
Event  occurs and  ending on the date on which all of the assets of the  Company
have been distributed to the Members pursuant to Section 6.1), the Members shall
continue to share Profits, Losses, gain, loss and other items of Company income,
gain, loss or deduction in the manner provided in Article III.

         Section 6.7  Certain Arrangements Relating to Liquidation.

                  Section  6.7.1  Appointment.  At the time  that a  Dissolution
Event  first  occurs,  IMMUNOMEDICS  shall  appoint  a  Person  to  oversee  the
liquidation of the Company.

                  Section 6.7.2  Fees.  The  Company  is  authorized  to  pay  a
reasonable  fee to the Liquidator  for his services  performed  pursuant to this
Article VI and to reimburse the Liquidator for his reasonable costs and expenses
incurred in performing those services.

         Section 6.8  Form of Liquidating Distributions.  For purposes of making
distributions  required by Section 6.1, the Liquidator may determine  whether to
distribute all or any portion of the Company's  assets in-kind or to sell all or
any portion of such assets and distribute the proceeds therefrom.

                                      A-18
<PAGE>


                                                                       EXHIBIT A



                                MEMBERSHIP ROSTER


   Name of Member                                                      Address

IMMUNOMEDICS, INC.                                      300 American Road
                                                        Morris Plains, NJ 07950


DAVID M. GOLDENBERG


<PAGE>



                                                                       EXHIBIT B

                      MEMBERS INITIAL CAPITAL CONTRIBUTIONS


   Name of Member                                                    $ Amount

IMMUNOMEDICS, INC.                                                   $18,648,000


DAVID M. GOLDENBERG                                                  $         0


<PAGE>

Contact:  Jay Steffenhagen, Beckman Coulter             (714) 773-7620
          Cynthia Sullivan, Immunomedics                (973) 605-8200, ext. 109


                BECKMAN COULTER AND IMMUNOMEDICS ANNOUNCE FUNDING
                 OF THEIR JOINT VENTURE FOR CANCER THERAPEUTICS


FULLERTON,  CA, and MORRIS  PLAINS,  NJ, March 9, 1999 - Beckman  Coulter,  Inc.
(NYSE:BEC) and Immunomedics, Inc. (NASDAQ:IMMU) announced today that their joint
venture in cancer therapeutics, IBC Pharmaceuticals,  LLC, has received start-up
funding from a private  investor group.  The group received a 7 percent interest
in IBC based on a $35 million valuation.

Operations  will begin at  Immunomedics  facilities  in New  Jersey and  Beckman
Coulter  facilities in Marseille France.  Immunomedics'  Chairman,  Dr. David M.
Goldenberg,  will also serve as Chairman of IBC, and Dr. Jacques Barbet,  one of
the inventors of IBC's technology,  will direct the European  operations.  Other
IBC  officers  are Michael  Brochu,  CEO,  formerly  Vice  President of business
development  at Coulter  Corp.,  and Richard  Williams,  CFO, who is Chairman of
Medco Research and a Director of Immunomedics.

IBC was formed in 1998 when Beckman  Coulter and a majority owned  subsidiary of
Immunomedics  each  contributed  basic  patents,  with the  intention of finding
outside  investors to fund  further  development.  At that time their  ownership
positions  were 47 percent and 53 percent  (by a  majority-owned  subsidiary  of
Immunomedics), respectively.

The joint  venture  will  attempt  to develop  new  therapies  that  selectively
irradiate  cancer  cells in a  two-step  process.  Treatment  would  begin  with
injection of a bispecific  antibody that targets the cancer.  These  proprietary
antibodies  then bind with a  radio-labeled  carrier that is injected later as a
second step.

Immunomedics,  through its subsidiary, has contributed its proprietary humanized
antibody against the cancer marker,  carcinoembryonic  antigen, which is used in
its CEA-Cide*  therapeutic.  Beckman Coulter has provided other antibodies and a
license to patents  covering  its  bispecific  targeting  technology  called the
"Affinity  Enhancement  System"  or  AES.  This  method  can  also  be  used  to
selectively deliver non-isotopic agents.

Beckman Coulter's Chairman, President and CEO, John P. Wareham, commented, "This
venture  brings  together  key  technologies  and shares  development  risk with
outside investors.  We are pleased to have found a way to further this promising
therapy."

<PAGE>

Dr.  Goldenberg  stated,  "Animal and  clinical  studies have shown that the IBC
technology  can deliver  diagnostic  and  therapeutic  isotopes to cancer cells,
especially in patients with small-cell  lung or medullary  thyroid  cancers.  We
plan to extend our capabilities to colorectal,  breast,  non-small cell lung and
prostate  cancers.  These efforts are being pursued in tandem with  Immunomedics
trials  of  CEA-Cide  and  LymphoCide*  that  use  directly  labeled  anticancer
antibodies."

Dr. Barbet added, "To-date, over 300 cancer patients have been studied using the
IBC technology,  and we have published animal and clinical studies demonstrating
improved targeting and encouraging  therapeutic responses.  The clinical studies
have been  directed  by  Professor  J.F.  Chatal  of  Nantes,  France,  who is a
prominent European investigator in nuclear medicine."

Beckman  Coulter,  Inc.,  is  a  leading  provider  of  instrument  systems  and
complementary  products that simplify and automate processes in life science and
clinical  laboratories.  The company's products are used throughout the world in
all phases of the battle against disease,  from pioneering  medical research and
drug  discovery to  diagnostic  testing that aids in patient  treatment.  Annual
sales for the  company  totaled  $1.7  billion in 1998,  with about half of this
amount generated outside the United States.

Immunomedics  is  a  biopharmaceutical   company  focused  on  the  development,
manufacture and commercialization of diagnostic imaging and therapeutic products
for the detection and treatment of cancer and infectious  diseases.  Integral to
these products are highly specific monoclonal  antibodies and antibody fragments
designed  to deliver  radioisotopes  and  chemotherapeutic  agents to tumors and
sites of infection. The Company's first product,  CEA-Scan* for the detection of
colorectal  cancer,  is being marketed in the United States and Europe (approved
in Canada).  The Company's second  diagnostic  imaging product,  LeukoScan*,  is
being marketed in Europe for the diagnosis of  osteomyelitis  (bone  infection).
This  product is presently  under  regulatory  review by the U.S.  Food and Drug
Administration.  Immunomedics also has several other diagnostic imaging products
and two therapeutic products in clinical trials.

This  release  contains  certain   forward-looking   statements   regarding  the
development and therapeutic  value of the IBC technology.  While Beckman Coulter
and  Immunomedics  believe  that this is a  promising  area for  research,  this
product  is in the  early  phases  of  development,  and they  cannot  offer any
assurances that marketable products will be developed or, if they are developed,
that necessary  government  approvals can be obtained.  The FDA has not approved
this technology for  therapeutic  use. Only limited  clinical  studies have been
performed  and  additional  studies  may show that the  technology  has  limited
clinical utility, is not sufficiently effective, or has side effects that render
it unacceptable for therapeutic use.

*CEA-Cide,  LymphoCide,  CEA-Scan  and LeukoScan are trademarks of Immunomedics,
Inc.


<PAGE>


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