IMMUNOMEDICS INC
8-A12G, 1998-01-29
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                         FORM 8-A

            SECURITIES AND EXCHANGE COMMISSION

                  Washington, D.C.  20549

        FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
        PURSUANT TO SECTION 12(b) OR (g) OF THE
        SECURITIES EXCHANGE ACT OF 1934

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

        Delaware                        61-1009366
        (State of incorporation         (IRS Employer Identification No.)
        or organization)

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

        Securities to be registered pursuant to Section 12(b) of the
Act:

        Title of each class             Name of each exchange on which
        to be so registered             each class is to be registered

          Not applicable                        Not applicable

        If this form relates to the registration of a class of
securities pursuant to Section 12(b) of the Exchange Act and is
effective pursuant to General Instruction A.(c), check the
following box.  [ ]

        If this form relates to the registration of a class of 
securities pusuant to Section 12(g) of the Exchange Act and is 
effective pursuant to General Instruction A.(d), check the 
following box.  [X]

        Securities Act registration statement file number to which 
this form relates:

        ____________________(if applicable)

        Securities to be registered pursuant to Section 12(g) of the 
Act:

                                --01--


<PAGE>


                        Preferred Share Purchase Rights
                              (Title of class)


                                --02--

<PAGE>


Item 1. Description of Securities to be Registered

                Effective as of January 23, 1998, pursuant to a Rights
Agreement (the "Rights Agreement") between Immunomedics, Inc. 
(the "Company") and American Stock Transfer and Trust Company, as 
Rights Agent (the "Rights Agent"), the Company's Board of 
Directors declared a dividend of one preferred share purchase 
right (a "Right") for each outstanding share of common stock, par 
value $.01 per share (the "Common Shares"), of the Company. The 
dividend is payable on February 2, 1998 (the "Record Date") to 
the stockholders of record on that date. Each Right entitles the 
registered holder to purchase from the Company one one-hundredth 
of a share of Series E Junior Participating Preferred Stock, par 
value $.01 per share (the "Preferred Shares"), of the Company at 
a price of $37 per one one-hundredth of a Preferred Share (the 
"Purchase Price"), subject to adjustment. 

                The following summary of the principal terms of the 
Rights Agreement is a general description only and is subject to 
the detailed terms and conditions of the Rights Agreement.  A 
copy of the Rights Agreement is attached as Exhibit 99.1 to this 
Registration Statement and is incorporated herein by reference; 
capitalized terms used but not otherwise defined herein shall 
have the meanings ascribed to them in the Rights Agreement.

Rights Evidenced by Common Share Certificates

                The Rights are exercisable at any time after the 
Distribution Date (defined below).  Until the Distribution Date, 
certificates representing the Rights ("Rights Certificates") will 
not be sent to stockholders and the Rights will attach to and 
trade only with the Common Shares.  Accordingly, Common Share 
certificates outstanding on the Record Date will evidence the 
Rights related thereto, and Common Share certificates issued 
after the Record Date upon transfer or new issuance of Common 
Shares will contain a notation incorporating the Rights Agreement 
by reference.  Until the Distribution Date (or earlier redemption 
or expiration of the Rights), the surrender for transfer of any 
certificates for Common Shares outstanding as of the Record Date, 
even without such notation or a copy of the Summary of Rights 
being attached thereto, will also constitute the transfer of the 
Rights associated with the Common Shares represented by such 
certificate.

                                --03--


<PAGE>


Distribution Date

                The Rights will separate from the Common Shares, Rights 
Certificates will be issued and the Rights will become 
exercisable upon such date (the "Distribution Date") which is the 
earlier of (i) 10 days following a public announcement that a 
person or group of affiliated or associated persons (an 
"Acquiring Person") has acquired beneficial ownership of 15% or 
more of the outstanding Common Shares or (ii) 10 business days 
(or such later date as may be determined by action of the Board 
of Directors prior to such time as any person or group of 
affiliated persons becomes an Acquiring Person) following the 
commencement of, or public announcement of an intention to make, 
a tender offer or exchange offer the consummation of which would 
result in the beneficial ownership by a person or group of 15% or 
more of the outstanding Common Shares.  An Acquiring Person shall 
not include any person or entity who or which together with 
affiliates or associates of such person or entity was the 
beneficial owner of 15% or more of the outstanding Common Shares 
as of January 23, 1998.

Issuance of Rights Certificates; Expiration of Rights

                As soon as practicable following the Distribution Date, 
separate Rights Certificates will be mailed to holders of record 
of the Common Shares as of the close of business on the 
Distribution Date and such separate Right Certificates alone will 
evidence the Rights from and after the Distribution Date.  All 
Common Shares issued prior to the earliest of the Distribution 
Date, the redemption of the Rights or the Final Expiration Date 
(as defined below) will be issued with Rights.  The Rights will 
expire on January 23, 2008 (the "Final Expiration Date"), unless 
the Final Expiration Date is extended or unless the Rights are 
earlier redeemed or exchanged by the Company, in each case, as 
described below.

Initial Exercise of the Rights

                Following the Distribution Date, and until one of the 
further events described below, holders of the Rights will be 
entitled to receive, upon exercise and the payment of $37 per 
Right, one one-hundredth of a Preferred Share, subject to 
adjustment as described below.  In addition, under certain 
circumstances described more fully herein, the Rights may become 
exercisable for Common Shares having a value equal to two times 
the Purchase Price and/or Common Stock of certain acquiring 
companies having a value equal to two times the Purchase Price.


                                --04--

<PAGE>


Right to Buy Acquiring Company Stock; Right to Buy Company Common 
Shares

                Unless the Rights are earlier redeemed, in the event 
that the Company is acquired in a merger or other business 
combination transaction or 50% or more of its consolidated assets 
or earning power are sold after a person or group has become an 
Acquiring Person, proper provision will be made so that each 
holder of a Right will thereafter have the right to receive, upon 
the exercise thereof at the then current exercise price of the 
Right, that number of shares of common stock of the acquiring 
company which at the time of such transaction will have a market 
value of two times the exercise price of the Right.  Similarly, 
unless the Rights are earlier redeemed, in the event that any 
person or group of affiliated or associated persons becomes an 
Acquiring Person, proper provision shall be made so that each 
holder of a Right, other than Rights beneficially owned by the 
Acquiring Person (which will thereafter be void), will thereafter 
have the right to receive upon exercise that number of Common 
Shares having a market value of two times the Purchase Price of 
the Right. 

Exchange Provision

                At any time after any person or group becomes an 
Acquiring Person and prior to the acquisition by such person or 
group of 50% or more of the outstanding Common Shares, the Board 
of Directors of the Company may exchange the Rights (other than 
Rights owned by such person or group which will have become 
void), in whole or in part, at an exchange ratio of one Common 
Share, or one one-hundredth of a Preferred Share (or of a share 
of a class or series of the Company's preferred stock having 
equivalent rights, preferences and privileges), per Right 
(subject to adjustment). 

Redemption

                At any time prior to the acquisition by a person or 
group of affiliated or associated persons of beneficial ownership 
of 15% or more of the outstanding Common Shares, the Board of 
Directors of the Company may redeem the Rights in whole, but not 
in part, at a price of $.001 per Right (the "Redemption Price"). 
The redemption of the Rights may be made effective at such time 
on such basis with such conditions as the Board of Directors in 
its sole discretion may establish. Immediately upon any 
redemption of the Rights, the right to exercise the Rights will
terminate and the only right of the holders of Rights will be to
receive the Redemption Price.


                                --05--

<PAGE>


Adjustments to Prevent Dilution

                The Purchase Price payable, and the number of Preferred
Shares or other securities or property issuable, upon exercise of
the Rights are subject to adjustment from time to time to prevent
dilution (i) in the event of a stock dividend on, or a
subdivision, combination or reclassification of, the Preferred
Shares, (ii) upon the grant to holders of the Preferred Shares of
certain rights or warrants to subscribe for or purchase Preferred
Shares at a price, or securities convertible into Preferred
Shares with a conversion price, less than the then-current market
price of the Preferred Shares, or (iii) upon the distribution to
holders of the Preferred Shares of evidences of indebtedness or
assets (excluding regular periodic cash dividends paid out of
earnings or retained earnings or dividends payable in Preferred
Shares) or of subscription rights or warrants (other than those
referred to above). The number of outstanding Rights and the
number of one one-hundredths of a Preferred Share issuable upon
exercise of each Right are also subject to adjustment in the
event of a stock split of the Common Shares or a stock dividend
on the Common Shares payable in Common Shares or subdivisions,
consolidations or combinations of the Common Shares occurring, in
any such case, prior to the Distribution Date.

                With certain exceptions, no adjustment in the Purchase
Price will be required until cumulative adjustments require an
adjustment of at least 1% in such Purchase Price.

Cash Paid Instead of Issuing Fractional Shares

                No fractional Preferred Shares will be issued (other
than fractions which are integral multiples of one one-hundredth
of a Preferred Share, which may, at the election of the Company,
be evidenced by depositary receipts) and in lieu thereof, an
adjustment in cash will be made based on the market price of the
Preferred Shares on the last trading day prior to the date of
exercise.
No Stockholders' Rights Prior to Exercise

                Until a Right is exercised, the holder thereof, as
such, will have no rights as a stockholder of the Company,
including, without limitation, the right to vote or to receive
dividends.


                                --06--

<PAGE>


Amendment to Rights Agreement

                The terms of the Rights may be amended by the Board of
Directors of the Company without the consent of the holders of
the Rights, including an amendment to lower certain thresholds
described above to not less than the greater of (i) the sum of
 .001% and the largest percentage of the outstanding Common Shares
then known to the Company to be beneficially owned by any person
or group of affiliated or associated persons and (ii) 10%, except
that from and after such time as any person or group of
affiliated or associated persons becomes an Acquiring Person no
such amendment may adversely affect the interests of the holders
of the Rights.

Rights and Preferences of the Preferred Shares

                Preferred Shares purchasable upon exercise of the
Rights will not be redeemable. Each Preferred Share will be
entitled to a minimum preferential quarterly dividend payment of
$1 per share, but will be entitled to an aggregate dividend of
100 times the dividend declared per Common Share. In the event of
liquidation, the holders of the Preferred Shares will be entitled
to a minimum preferential liquidation payment of $100 per share,
but will be entitled to an aggregate payment of 100 times the
payment made per Common Share. Each Preferred Share will have 100
votes, voting together with the Common Shares. Finally, in the
event of any merger, consolidation or other transaction in which
Common Shares are exchanged, each Preferred Share will be
entitled to receive 100 times the amount received per Common
Share. These rights are protected by customary antidilution
provisions.

                Because of the nature of the Preferred Shares'
dividend, liquidation and voting rights, the value of the one
one-hundredth interest in a Preferred Share purchasable upon
exercise of each Right should approximate the value of one Common
Share.

Certain Anti-takeover Effects

                The Rights are designed to deal with the problem of a
raider using what the Board of Directors perceives to be coercive
tactics to deprive the Company's Board of Directors and


                                --07--

<PAGE>


stockholders of any real opportunity to determine the destiny of
the Company by forcing the raider to negotiate with the Company's
Board of Directors.  The Rights may be redeemed by the Company at
a redemption price of $0.001 per Right, subject to adjustment,
prior to the public announcement that 15% or more of the Common
Shares has been accumulated by a single acquiror or group.  Thus,
they should not interfere with any merger or other business
combination approved by the Board of Directors nor affect any
prospective offeror willing to negotiate in good faith with the
Board of Directors.  The Rights Agreement does not inhibit any
stockholder from utilizing the Proxy mechanism to promote a
change in the management or direction of the Company.  While the
Board of Directors is not aware of any effort to acquire control
of the Company, it believes that the Rights Agreement represents
a sound and reasonable means of safeguarding the investment of
stockholders in the Company.

                Distribution of the Rights will not in any way alter
the financial strength of the Company or interfere with its
business plans.  The distribution of the Rights is not dilutive,
does not affect reported earnings per share, is not taxable
either to the recipient or to the Company, and will not change
the way in which stockholders can currently trade shares of
Common Stock.  However, under certain circumstances, particularly
where the Rights are "triggered" as the result of certain
potentially abusive tactics, exercise of the Rights may be
dilutive or affect reported earnings per share.

Item 2.  Exhibits

        99.1            Rights Agreement, dated as of January 23, 1998,
between Immunomedics, Inc. and American Stock
Transfer and Trust Company, including the form of
Certificate of Designation, the form of Rights
Certificate and the Summary of Rights attached
thereto as Exhibits A, B and C, respectively.


                                --08--

<PAGE>


        SIGNATURE

                Pursuant to the requirements of Section 12 of the
Securities Exchange Act of 1934, the Registrant has duly caused
this Registration Statement to be signed on its behalf by the
undersigned, thereto duly authorized.


DATED:  January 27, 1998


                                        IMMUNOMEDICS, INC.



                                        By:     /s/ David M. Goldenberg
                                                David M. Goldenberg
                                                Chairman, Chief Executive
                                                Officer and Director
                                                (Principal Executive Officer)


                                --09--

<PAGE>

                                EXHIBIT INDEX

                                                                Sequential
Exhibit No.                     Exhibit                         Page Number

99.1                    Rights Agreement, dated as of
                        January 23, 1998, between
                        Immunomedics, Inc. and American
                        Stock Transfer and Trust Company,
                        including the form of Certificate
                        of Designation, the form of Rights
                        Certificate and the Summary of
                        Rights attached thereto as Exhibits
                        A, B and C, respectively.


                                --10--


<PAGE>



                         RIGHTS AGREEMENT

                    Dated as of January 23, 1998



                        IMMUNOMEDICS, INC.


                                and


              AMERICAN STOCK TRANSFER AND TRUST COMPANY
                             Rights Agent



<PAGE>




                        TABLE OF CONTENTS


                                                        Page

Section 1.      Certain Definitions.                      1

Section 2.      Appointment of Rights Agent.              4

Section 3.      Issue of Right Certificates.              4

Section 4.      Form of Right Certificates.               7

Section 5.      Countersignature and Registration.        7

Section 6.      Transfer, Split Up, Combination
                and Exchange of Right Certificates;
                Mutilated, Destroyed, Lost or Stolen
                Right Certificates.                       8

Section 7.      Exercise of Rights; Purchase Price;
                Expiration Date of Rights.                9

Section 8.      Cancellation and Destruction of Right
                Certificates.                            10

Section 9.      Availability of Preferred Shares.        10

Section 10.     Preferred Shares Record Date.            11

Section 11.     Adjustment of Purchase Price, Number
                of Shares or Number of Rights.           12

Section 12.     Certificate of Adjusted Purchase Price
                or Number of Shares.                     20

Section 13.     Consolidation, Merger or Sale or
                Transfer of Assets or Earning Power.     20

Section 14.     Fractional Rights and Fractional Shares. 22

Section 15.     Rights of Action.                        23

Section 16.     Agreement of Right Holders.              24

Section 17.     Right Certificate Holder Not Deemed a
                Stockholder.                             24

Section 18.     Concerning the Rights Agent.             25

Section 19.     Merger or Consolidation or Change of
                Name of Rights Agent.                    25

Section 20.     Duties of Rights Agent.                  26

Section 21.     Change of Rights Agent.                  28

                                -i-

<PAGE>

Section 22.     Issuance of New Right Certificates.      29

Section 23.     Redemption.                              30

Section 24.     Exchange.                                30

Section 25.     Notice of Certain Events.                32

Section 26.     Notices.                                 33

Section 27.     Supplements and Amendments.              34

Section 28.     Successors.                              35

Section 29.     Benefits of this Agreement.              35

Section 30.     Severability.                            35

Section 31.     Governing Law.                           35

Section 32.     Counterparts.                            35

Section 33.     Descriptive Headings.                    35

Signatures                                               36



Exhibit A - Form of Certificate of Designations

Exhibit B - Form of Right Certificate

Exhibit C - Summary of Rights to Purchase Preferred
                  Shares

                                -ii-

<PAGE>


                Agreement, dated as of January 23, 1998, between Immunomedics,
Inc., a Delaware corporation (the "Company"), and American Stock Transfer and
Trust Company (the "Rights Agent").

                The Board of Directors of the Company has authorized and
declared a dividend of one preferred share purchase right (a "Right") for each
Common Share (as hereinafter defined) of the Company outstanding on February 2,
1998 (the "Record Date"), each Right representing the right to purchase one
one-hundredth of a Preferred Share (as hereinafter defined), upon the terms and
subject to the conditions herein set forth, and has further authorized and
directed the issuance of one Right with respect to each Common Share that shall
become outstanding between the Record Date and the earliest of the Distribution
Date, the Redemption Date and the Final Expiration Date (as such terms are
hereinafter defined).

                Accordingly, in consideration of the premises and the mutual
agreements herein set forth, the parties hereby agree as follows:

                Section 1.      Certain Definitions.  For purposes of this
Agreement, the following terms have the meanings indicated:

                (a)     "Acquiring Person" shall mean any Person (as such term
is hereinafter defined) who or which, together with all Affiliates and
Associates (as such terms are hereinafter defined) of such Person, shall be the
Beneficial Owner (as such term is hereinafter defined) of 15% or more of the
Common Shares of the Company then outstanding, but shall not include the
Company, any Subsidiary (as such term is hereinafter defined) of the Company,
any employee benefit plan of the Company or of any Subsidiary of the Company,
any entity holding Common Shares for or pursuant to the terms of any such plan
or any Person who or which, together with all Affiliates and Associates of such
Person, was the Beneficial Owner of 15% or more of the outstanding Common
Shares of the Company as of the date of this Agreement.  Notwithstanding the
foregoing, no Person shall become an "Acquiring Person" as the result of an
acquisition of Common Shares by the Company which, by reducing the number of
shares outstanding, increases the proportionate number of shares beneficially
owned by such Person to 15% or more of the Common Shares of the Company then
outstanding; provided, however, that if a Person shall become the Beneficial
Owner of 15% or more of the Common Shares of the Company then outstanding by
reason of share purchases by the Company and shall, after such share purchases

                                -1-

<PAGE>


by the Company, become the Beneficial Owner of any additional Common Shares of
the Company, then such Person shall be deemed to be an "Acquiring Person".
Notwithstanding the foregoing, if the Board of Directors of the Company
determines in good faith that a Person who would otherwise be an "Acquiring
Person", as defined pursuant to the foregoing provisions of this paragraph (a),
has become such inadvertently, and such Person divests as promptly as
practicable a sufficient number of Common Shares so that such Person would no
longer be an "Acquiring Person," as defined pursuant to the foregoing provisions
of this paragraph (a), then such Person shall not be deemed to be an "Acquiring
Person" for any purposes of this Agreement.

                (b)     "Affiliate" and "Associate" shall have the respective
meanings ascribed to such terms in Rule 12b-2 of the General Rules and
Regulations under the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), as in effect on the date of this Agreement.

                (c)     A Person shall be deemed the "Beneficial Owner" of and
shall be deemed to "beneficially own" any securities:                

                (i)     which such Person or any of such Person's Affiliate or
        Associates beneficially owns, directly or indirectly;

                (ii)    which such Person or any of such Person's Affiliate or
        Associates has (A) the right to acquire (whether such right is
        exercisable immediately or only after the passage of time) pursuant to
        any agreement, arrangement or understanding (other than customary
        agreements with and between underwriters and selling group members with
        respect to a bona fide public offering of securities), or upon the
        exercise of conversion rights, exchange rights, rights (other than
        these Rights), warrants or options, or otherwise; provided, however,
        that a Person shall not be deemed the Beneficial Owner of, or to
        beneficially own, securities tendered pursuant to a tender or exchange
        offer made by or on behalf of such Person or any of such Person's
        Affiliates or Associates until such tendered securities are accepted 
        for purchase or exchange; or (B) the right to vote pursuant to any
        agreement, arrangement or understanding; provided, however, that a
        
                                -2-

<PAGE>

        
        Person shall not be deemed the Beneficial Owner of, or to beneficially
        own, any security if the agreement, arrangement, or understanding to
        vote such security (1) arises solely from a revocable proxy or consent
        given to such Person in response to a public proxy or consent
        solicitation made pursuant to, and in accordance with, the applicable
        rules and regulations promulgated under the Exchange Act and (2) is not
        also then reportable on Schedule 13D under the Exchange Act (or any
        comparable or successor report); or

                (iii)  which are beneficially owned, directly or indirectly by
        any other Person with which such Person or any of such Person's
        Affiliates or Associates has any agreement, arrangement or
        understanding (other than customary agreements with and between
        underwriters and selling group members with respect to a bona fide
        public offering of securities) for the purpose of acquiring, holding,
        voting (except to the extent contemplated by the proviso to Section
        1(c)(ii)(B)) or disposing of any securities of the Company. 

                Notwithstanding anything in this definition of Beneficial
Ownership to the contrary, the phrase "then outstanding," when used with
reference to a Person's Beneficial Ownership of securities of the Company,
shall mean the number of such securities then issued and outstanding together
with the number of such securities not then actually issued and outstanding
which such Person would be deemed to own beneficially hereunder.

                (d)     "Business Day" shall mean any day other than a
Saturday, a Sunday, or a day on which banking institutions in the State of New
York are authorized or obligated by law or executive order to close.

                (e)     "Close of Business" on any given date shall mean 5:00
P.M. New York time, on such date; provided, however, that if such date is not
a Business Day it shall mean 5:00 P.M., New York time, on the next succeeding
Business Day.

                (f)     "Common Shares" when used with reference to the Company
shall mean the shares of common stock, par value $.01 per share, of the
Company.  "Common Shares" when used with reference to any Person other than the
Company shall mean the capital stock (or equity interest) with the greatest
voting power of such other Person or, if such other Person is a Subsidiary of
another Person, the Person or Persons which ultimately control such
first-mentioned Person.

                                -3-

<PAGE>


                (g)     "Distribution Date" shall have the meaning set forth in
Section 3 hereof.

                (h)     "Final Expiration Date" shall have the meaning set
forth in Section 7 hereof.

                (i)     "Person" shall mean any individual, firm, corporation
or other entity, and shall include any successor (by merger or otherwise) of
such entity.

                (j)     "Preferred Shares" shall mean shares of Series E Junior
Participating Preferred Stock, par value $.01 per share, of the Company having
the rights and preferences set forth in the Form of Certificate of Designations
attached to this Agreement as Exhibit A.

                (k)     "Redemption Date" shall have the meaning set forth in
Section 7 hereof.

                (l)     "Shares Acquisition Date" shall mean the first date of
public announcement by the Company or an Acquiring Person that an Acquiring
Person has become such.

                (m)     "Subsidiary" of any Person shall mean any corporation
or other entity of which a majority of the voting power of the voting equity
securities or equity interest is owned, directly or indirectly, by such Person.
 
                Section 2.  Appointment of Rights Agent.  The Company hereby
appoints the Rights Agent to act as agent for the Company and the holders of
the Rights (who, in accordance with Section 3 hereof, shall prior to the
Distribution Date also be the holders of the Common Shares) in accordance with
the terms and conditions hereof, and the Rights Agent hereby accepts such
appointment.  The Company may from time to time appoint such co-Rights Agents
as it may deem necessary or desirable.

                Section 3.  Issue of Right Certificates.  (a)  Until the
earlier of (i) the tenth day after the Shares Acquisition Date or (ii) the
tenth business day (or such later date as may be determined by action of the
Board of Directors prior to such time as any Person becomes an Acquiring
Person) after the date of the commencement by any Person (other than the
Company, any Subsidiary of the Company, any employee benefit plan of the
Company or of any Subsidiary of the Company or any entity holding Common Shares
for or pursuant to the terms of any such plan or any Person who or which,

                                -4-

<PAGE>

together with all Affiliates and Associates of such Person, was the Beneficial
Owner of 15% or more of the outstanding Common Shares of the Company as of the
date of this Agreement) of, or of the first public announcement of the
intention of any Person (other than the Company, any Subsidiary of the Company,
any employee benefit plan of the Company or of any Subsidiary of the Company or
any entity holding Common Shares for or pursuant to the terms of any such plan
or any Person who or which, together with all Affiliates and Associates of such
Person, was the Beneficial Owner of 15% or more of the outstanding Common
Shares of the Company as of the date of this Agreement) to commence, a tender
or exchange offer the consummation of which would result in any Person becoming
the Beneficial Owner of Common Shares aggregating 15% or more of the then
outstanding Common Shares (including any such date which is after the date of
this Agreement and prior to the issuance of the Rights; the earlier of such
dates being herein referred to as the "Distribution Date"), (x) the Rights will
be evidenced (subject to the provisions of Section 3(b) hereof) by the
certificates for Common Shares registered in the names of the holders thereof
(which certificates shall also be deemed to be Right Certificates) and not by
separate Right Certificates, and (y) the right to receive Right Certificates
will be transferable only in connection with the transfer of Common Shares.  As
soon as practicable after the Distribution Date, the Company will prepare and
execute, the Rights Agent will countersign, and the Company will send or cause
to be sent (and the Rights Agent will, if requested, send) by first-class,
insured, postage-prepaid mail, to each record holder of Common Shares as of the
close of business on the Distribution Date, at the address of such holder shown
on the records of the Company, a Right Certificate, in substantially the form
of Exhibit B hereto (a "Right Certificate"), evidencing one Right for each
Common Share so held.  As of the Distribution Date, the Rights will be
evidenced solely by such Right Certificates. 

                (b)     On the Record Date, or as soon as practicable
thereafter, the Company will send a copy of a Summary of Rights to Purchase
Preferred Shares, in substantially the form of Exhibit C hereto (the "Summary
of Rights"), by first-class, postage-prepaid mail, to each record holder of
Common Shares as of the close of business on the Record Date, at the address of
such holder shown on the records of the Company.  With respect to certificates

                                -5-

<PAGE>

for Common Shares outstanding as of the Record Date, until the Distribution
Date, the Rights will be evidenced by such certificates registered in the names
of the holders thereof together with a copy of the Summary of Rights attached
thereto.  Until the Distribution Date (or the earlier of the Redemption Date or
the Final Expiration Date), the surrender for transfer of any certificate for
Common Shares outstanding on the Record Date, with or without a copy of the
Summary of Rights attached thereto, shall also constitute the transfer of the
Rights associated with the Common Shares represented thereby.

                (c)     Certificates for Common Shares which become outstanding
(including, without limitation, reacquired Common Shares referred to in the
last sentence of this paragraph (c) after the Record Date but prior to the
earliest of the Distribution Date, the Redemption Date or the Final Expiration
Date shall have impressed on, printed on, written on or otherwise affixed to
them the following legend:

                This certificate also evidences and entitles the holder hereof
                to certain rights as set forth in a Rights Agreement between
                Immunomedics, Inc.a nd American Stock Transfer and Trust
                Company dated as of January 23, 1998 (the "Rights Agreement"),
                the terms of which are hereby incorporated herein by reference
                and a copy of which is on file at the principal executive
                offices of Immunomedics, Inc.  Under certain circumstances, as
                set forth in the Rights Agreement, such Rights will be
                evidenced by separate certificates and will no longer be
                evidenced by this certificate.  Immunomedics, Inc. will mail to
                the holder of this certificate a copy of the Rights Agreement
                without charge after receipt of a written request therefor.
                Under certain circumstances, as set forth in the Rights
                Agreement, Rights issued to any Person who becomes an Acquiring
                Person (as defined in the Rights Agreement) may become null and
                void.

With respect to such certificates containing the foregoing legend, until the
Distribution Date, the Rights associated with the Common Shares represented by
such certificates shall be evidenced by such certificates alone, and the
surrender for transfer of any such certificate shall also constitute the
transfer of the Rights associated with the Common Shares represented thereby.
In the event that the Company purchases or acquires any Common Shares after the
Record Date but prior to the Distribution Date, any Rights associated with such
Common Shares shall be deemed cancelled and retired so that the Company shall
not be entitled to exercise any Rights associated with the Common Shares which
are no longer outstanding.

                Section 4.  Form of Right Certificates.  The Right Certificates
(and the forms of election to purchase Preferred Shares and of assignment to be
printed on the reverse thereof) shall be substantially the same as Exhibit B

                                -6-

<PAGE>

hereto and may have such marks of identification or designation and such
legends, summaries or endorsements printed thereon as the Company may deem
appropriate and as are not inconsistent with the provisions of this Agreement,
or as may be required to comply with any applicable law or with any rule or
regulation made pursuant thereto or with any rule or regulation of any stock
exchange on which the Rights may from time to time be listed, or to conform to
usage. Subject to the provisions of Section 22 hereof, the Right Certificates
shall entitle the holders thereof to purchase such number of one one-hundredths
of a Preferred Share as shall be set forth therein at the price per one
one-hundredth of a Preferred Share set forth therein (the "Purchase Price"),
but the number of such one one-hundredths of a Preferred Share and the Purchase
Price shall be subject to adjustment as provided herein.

                Section 5.  Countersignature and Registration.  The Right
Certificates shall be executed on behalf of the Company by its Chairman of the
Board, its Chief Executive Officer, any of its Vice Presidents, or its
Treasurer, either manually or by facsimile signature, shall have affixed
thereto the Company's seal or a facsimile thereof, and shall be attested by the
Secretary or an Assistant Secretary of the Company, either manually or by
facsimile signature.  The Right Certificates shall be manually countersigned by
the Rights Agent and shall not be valid for any purpose unless countersigned.
In case any officer of the Company who shall have signed any of the Right
Certificates shall cease to be such officer of the Company before
countersignature by the Rights Agent and issuance and delivery by the Company,
such Right Certificates, nevertheless, may be countersigned by the Rights Agent
and issued and delivered by the Company with the same force and effect as
though the person who signed such Right Certificates had not ceased to be such
officer of the Company; and any Right Certificate may be signed on behalf of
the Company by any person who, at the actual date of the execution of such
Right Certificate, shall be a proper officer of the Company to sign such Right
Certificate, although at the date of the execution of this Rights Agreement any
such person was not such an officer.

                Following the Distribution Date, the Rights Agent will keep or
cause to be kept, at its principal office, books for registration and transfer
of the Right Certificates issued hereunder.  Such books shall show the names
and addresses of the respective holders of the Right Certificates, the number
of Rights evidenced on its face by each of the Right Certificates and the date
of each of the Right Certificates.

                                -7-

<PAGE>

                Section 6.  Transfer, Split Up, Combination and Exchange of
Right Certificates; Mutilated, Destroyed, Lost or Stolen Right Certificates.
Subject to the provisions of Section 14 hereof, at any time after the close of
business on the Distribution Date, and at or prior to the close of business on
the earlier of the Redemption Date or the Final Expiration Date, any Right
Certificate or Right Certificates (other than Right Certificates representing
Rights that have become void pursuant to Section 11(a)(ii) hereof or that have
been exchange pursuant to Section 24 hereof) may be transferred, split up,
combined or exchanged for another Right Certificate or Right Certificates,
entitling the registered holder to purchase a like number of one one-hundredths
of a Preferred Share as the Right Certificate or Right Certificates surrendered
then entitled such holder to purchase.  Any registered holder desiring to
transfer, split up, combine or exchange any Right Certificate or Right
Certificates shall make such request in writing delivered to the Rights Agent,
and shall surrender the Right Certificate or Right Certificates to be
transferred, split up, combined or exchanged at the principal office of the
Rights Agent.   Thereupon the Rights Agent shall countersign and deliver to the
person entitled thereto a Right Certificate or Right Certificates, as the case
may be, as so requested.  The Company may require payment of a sum sufficient
to cover any tax or governmental charge that may be imposed in connection with
any transfer, split up, combination or exchange of Right Certificates.

                Upon receipt by the Company and the Rights Agent of evidence
reasonably satisfactory to them of the loss, theft, destruction or mutilation
of a Right Certificate, and, in case of loss theft or destruction, of indemnity
or security reasonably satisfactory to them, and, at the Company's request,
reimbursement to the Company and the Rights Agent of all reasonable expenses
incidental thereto, and upon surrender to the Rights Agent and cancellation of
the Right Certificate if mutilated, the Company will make and deliver a new
Right Certificate of like tenor to the Rights Agent for delivery to the
registered holder in lieu of the Right Certificate so lost, stolen, destroyed
or mutilated.

                Section 7.  Exercise of Rights; Purchase Price; Expiration Date
of Rights.  (a)  The registered holder of any Right Certificate may exercise
the Rights evidenced thereby (except as otherwise provided herein) in whole or

                                -8-

<PAGE>

in part at any time after the Distribution Date upon surrender of the Right
Certificate, with the form of election to purchase on the reverse side thereof
duly executed, to the Rights Agent at the principal office of the Rights Agent,
together with payment of the Purchase Price for each one one-hundredth of a
Preferred Share as to which the Rights are exercised, at or prior to the
earliest of (i) the close of business on January 23, 2008 (the "Final
Expiration Date"), (ii) the time at which the Rights are redeemed as provided
in Section 23 hereof (the "Redemption Date"), or (iii) the time at which such
Rights are exchanged as provided in Section 24 hereof.

                (b)     The Purchase Price for each one one-hundredth of a
Preferred Share purchasable pursuant to the exercise of a Right shall initially
be $37, and shall be subject to adjustment from time to time as provided in
Section 11 or 13 hereof and shall be payable in lawful money of the United
States of America in accordance with paragraph (c) below.

                (c)     Upon receipt of a Right Certificate representing
exercisable Rights, with the form of election to purchase duly executed,
accompanied by payment of the Purchase Price for the shares to be purchased and
an amount equal to any applicable transfer tax required to be paid by the
holder of such Right Certificate in accordance with Section 9 hereof by
certified check, cashier's check or money order payable to the order of the 
Company, the Rights Agent shall thereupon promptly (i) (A) requisition from any
transfer agent of the Preferred Shares certificates for the number of Preferred
Shares to be purchased and the Company hereby irrevocably authorizes its
transfer agent to comply with all such requests, or (B) requisition from the
depositary agent depositary receipts representing such number of one
one-hundredths of a Preferred Share as are to be purchased (in which case
certificates for the Preferred Shares represented by such receipts shall be
deposited by the transfer agent with the depositary agent) and the Company
hereby directs the depositary agent to comply with such request, (i) when 
appropriate, requisition from the Company the amount of cash to be paid in lieu
of issuance of fractional shares in accordance with Section 14 hereof, (iii)
after receipt of such certificates or depositary receipts, cause the same to be
delivered to or upon the order of the registered holder of such Right
Certificate, registered in such name or names as may be designated by such
holder and (iv) when appropriate, after receipt, deliver such cash to or upon
the order of the registered holder of such Right Certificate.

                                -9-

<PAGE>

                (d)     In case the registered holder of any Right Certificate
shall exercise less than all the Rights evidenced thereby, a new Right
Certificate evidencing Rights equivalent to the Rights remaining unexercised
shall be issued by the Rights Agent to the registered holder of such Right
Certificate or to his duly authorized assigns, subject to the provisions of
Section 14 hereof.

                Section 8.  Cancellation and Destruction of Right Certificates.
All Right Certificates surrendered for the purpose of exercise, transfer, split
up, combination or exchange shall, if surrendered to the Company or to any of
its agents, be delivered to the Rights Agent for cancellation or in cancelled
form, or, if surrendered to the Rights Agent, shall be cancelled by it, and no
Right Certificates shall be issued in lieu thereof except as expressly
permitted by any of the provisions of this Rights Agreement.  The Company shall
deliver to the Rights Agent for cancellation and retirement, and the Rights
Agent shall so cancel and retire, any other Right Certificate purchased or
acquired by the Company otherwise than upon the exercise thereof.  The Rights
Agent shall deliver all cancelled Right Certificates to the Company, or shall,
at the written request of the Company, destroy such cancelled Right
Certificates, and in such case shall deliver a certificate of destruction
thereof to the Company.

                Section 9.  Availability of Preferred Shares.  The Company
covenants and agrees that it will cause to be reserved and kept available out
of its authorized and unissued Preferred Shares or any Preferred Shares held in
its treasury, the number of Preferred Shares that will be sufficient to permit
the exercise in full of all outstanding Rights in accordance with Section 7.
The Company covenants and agrees that it will take all such action as may be
necessary to ensure that all Preferred Shares delivered upon exercise of rights
shall, at the time of delivery of the certificates for such Preferred Shares
(subject to payment of the Purchase Price), be duly and validly authorized and
issued and fully paid and nonassessable shares.

                The Company further covenants and agrees that it will pay when
due and payable any and all federal and state transfer taxes and charges which
may be payable in respect of the issuance or delivery of the Right Certificates
or of any Preferred Shares upon the exercise of Rights.  The Company shall not,

                                -10-

<PAGE>

however, be required to pay any transfer tax which may be payable in respect of
any transfer or delivery of Right Certificates to a person other than, or the
issuance or delivery of certificates or depositary receipts for the Preferred
Shares in a name other than that of, the registered holder of the Right
Certificate evidencing Rights surrendered for exercise or to issue or to
deliver any certificates or depositary receipts for Preferred Shares upon the
exercise of any Rights until any such tax shall have been paid (any such tax
being payable by the holder of such Right Certificate at the time of surrender)
or until it has been established to the Company's reasonable satisfaction that
no such tax is due.

                Section 10.  Preferred Shares Record Date.  Each person in
whose name any certificate for Preferred Shares is issued upon the exercise of
Rights shall for all purposes be deemed to have become the holder of record of
the Preferred Shares represented thereby on, and such certificate shall be
dated, the date upon which the Right Certificate evidencing such Rights was
duly surrendered and payment of the Purchase Price (and any applicable transfer
taxes) was made; provided, however, that if the date of such surrender and
payment is a date upon which the Preferred Shares transfer books of the Company
are closed, such person shall be deemed to have become the record holder of
such shares on, and such certificate shall be dated, the next succeeding
Business Day on which the Preferred Shares transfer books of the Company are
open.  Prior to the exercise of the Rights evidenced thereby, the holder of a
Right Certificate shall not be entitled to any rights of a holder of Preferred
Shares for which the Rights shall be exercisable, including, without
limitation, the right to vote, to receive dividends or other distributions or
to exercise any preemptive rights, and shall not be entitled to receive any
notice of any proceedings of the Company, except as provided herein.

                Section 11.  Adjustment of Purchase Price, Number of Shares or
Number of Rights.  The Purchase Price, the number of Preferred Shares covered
by each Right and the number of Rights outstanding are subject to adjustment
from time to time as provided in this Section 11.

                (a)  (i)  In the event the Company shall at any time after the
date of this Agreement (A) declare a dividend on the Preferred Shares payable
in Preferred Shares, (B) subdivide the outstanding Preferred Shares, (C)

                                -11-

<PAGE>

combine the outstanding Preferred Shares into a smaller number of Preferred
Shares or (D) issue any shares of its capital stock in a reclassification of
the Preferred Shares (including any such reclassification in connection with a
consolidation or merger in which the Company is the continuing or surviving
corporation), except as otherwise provided in this Section 11(a), the Purchase
Price in effect at the time of the record date for such dividend or of the
effective date of such subdivision, combination or reclassification, and the
number and kind of shares of capital stock issuable on such date, shall be
proportionately adjusted so that the holder of any Right exercised after such
time shall be entitled to receive the aggregate number and kind of shares of
capital stock which, if such Right had been exercised immediately prior to such
date and at a time when the Preferred Shares transfer books of the Company were
open, he would have owned upon such exercise and been entitled to receive by
virtue of such dividend, subdivision, combination or reclassification;
provided, however, that in no event shall the consideration to be paid upon the
exercise of one Right be less than the aggregate par value of the shares of
capital stock of the Company issuable upon exercise of one Right.

                (ii)    Subject to Section 24 of this Agreement, in the event
any Person becomes an Acquiring Person, each holder of a Right shall thereafter
have a right to receive, upon exercise thereof at a price equal to the then
current Purchase Price multiplied by the number of one one-hundredths of a
Preferred Share for which a Right is then exercisable, in accordance with the
terms of this Agreement and in lieu of Preferred Shares, such number of Common
Shares of the Company as shall equal the result obtained by (x) multiplying the
then current Purchase Price by the number of one one-hundredths of a Preferred
Share for which a Right is then exercisable and dividing that product by (y)
50% of the then current per share market price of the Company's Common Shares
(determined pursuant to Section 11(d) hereof) on the date of the occurrence of
such event. In the event that any Person shall become an Acquiring Person and
the Rights shall then be outstanding, the Company shall not take any action
which would eliminate or diminish the benefits intended to be afforded by the
Rights.

                From and after the occurrence of such event, any Rights that
are or were acquired or beneficially owned by any Acquiring Person (or any
Associate or Affiliate of such Acquiring Person) shall be void and any holder

                                -12-

<PAGE>

of such Rights shall thereafter have no right to exercise such Rights under any
provision of this Agreement.  No Right Certificate shall be issued pursuant to
Section 3 that represents Rights beneficially owned by an Acquiring Person
whose Rights would be void pursuant to the preceding sentence or any Associate
or Affiliate thereof; no Right Certificate shall be issued at any time upon the
transfer of any Rights to an Acquiring Person whose Rights would be void
pursuant to the preceding sentence or any Associate or Affiliate thereof or to
any nominee of such Acquiring Person, Associate or Affiliate; and any Right
Certificate delivered to the Rights Agent for transfer to an Acquiring Person
whose Rights would be void pursuant to the preceding sentence shall be
cancelled.

                (iii)  In the event that there shall not be sufficient Common
Shares issued but not outstanding or authorized but unissued to permit the
exercise in full of the Rights in accordance with the foregoing subparagraph
(ii), the Company shall take all such action as may be necessary to authorize
additional Common Shares for issuance upon exercise of the Rights.  In the
event the Company shall, after good faith effort, be unable to take all such
action as may be necessary to authorize such additional Common Shares, the
Company shall substitute, for each Common Share that would otherwise be
issuable upon exercise of a Right, a number of Preferred Shares or fraction
thereof such that the current per share market price of one Preferred Share
multiplied by such number or fraction is equal to the current per share market
price of one Common Share as of the date of issuance of such Preferred Shares
or fraction thereof.

                (b)     In case the Company shall fix a record date for the
issuance of rights, options or warrants to all holders of Preferred Shares
entitling them (for a period expiring within 45 calendar days after such record
date) to subscribe for or purchase Preferred Shares (or shares having the same
rights, privileges and preferences as the Preferred Shares ("equivalent
preferred shares")) or securities convertible into Preferred Shares or
equivalent preferred shares at a price per Preferred Share or equivalent
preferred share (or having a conversion price per share, if a security
convertible into Preferred Shares or equivalent preferred shares) less than the
then current per share market price of the Preferred Shares (as defined in
Section 11(d)) on such record date, the Purchase Price to be in effect after
such record date shall be determined by multiplying the Purchase Price in

                                -13-

<PAGE>

effect immediately prior to such record date by a fraction, the numerator of
which shall be the number of Preferred Shares outstanding on such record date
plus the number of Preferred Shares which the aggregate offering price of the
total number of Preferred Shares and/or equivalent preferred shares so to be
offered (and/or the aggregate initial conversion price of the convertible
securities so to be offered) would purchase at such current market price and
the denominator of which shall be the number of Preferred Shares outstanding on
such record date plus the number of additional Preferred Shares and/or
equivalent preferred shares to be offered for subscription or purchase (or into
which the convertible securities so to be offered are initially convertible);
provided, however, that in no event shall the consideration to be paid upon the
exercise of one Right be less than the aggregate par value of the shares of
capital stock of the Company issuable upon exercise of one Right.  In case such
subscription price may be paid in a consideration part or all of which shall be
in a form other than cash, the value of such consideration shall be as
determined in good faith by the Board of Directors of the Company, whose
determination shall be described in a statement filed with the Rights Agent.
Preferred Shares owned by or held for the account of the Company shall not be
deemed outstanding for the purpose of any such computation.  Such adjustment
shall be made successively whenever such a record date is fixed; and in the
event that such rights, options or warrants are not so issued, the Purchase
Price shall be adjusted to be the Purchase Price which would then be in effect
if such record date had not been fixed.

                (c)     In case the Company shall fix a record date for the
making of a distribution to all holders of the Preferred Shares (including any
such distribution made in Connection with a consolidation or merger in which
the Company is the continuing or surviving corporation) of evidences of
indebtedness or assets (other than a regular quarterly cash dividend or a
dividend payable in Preferred Shares) or subscription rights or warrants
(excluding those referred to in Section 11(b) hereof), the Purchase Price to be
in effect after such record date shall be determined by multiplying the
Purchase Price in effect immediately prior to such record date by a fraction,
the numerator of which shall be the then current per share market price of the
Preferred Shares on such record date, less the fair market value (as determined
in good faith by the Board of Directors of the Company, whose determination
shall be described in a statement filed with the Rights Agent) of the portion
of the assets or evidences of indebtedness so to be distributed or of such

                                -14-

<PAGE>

subscription rights or warrants applicable to one Preferred Share and the
denominator of which shall be such current per share market price of the
Preferred Shares; provided, however, that in no event shall the consideration
to be paid upon the exercise of one Right be less than the aggregate par value
of the shares of capital stock of the Company to be issued upon exercise of one
Right. Such adjustments shall be made successively whenever such a record date
is fixed; and in the event that such distribution is not so made, the Purchase
Price shall again be adjusted to be the Purchase Price which would then be in
effect if such record date had nol been fixed.

                (d)  (i)  For the purpose of any computation hereunder, the
"current per share market price" of any security (a "Security" for the purpose
of this Section 11(d)(i)) on any date shall be deemed to be the average of the
daily closing prices per share of such Security for the 30 consecutive Trading
Days (as such term is hereinafter defined) immediately prior to such date;
provided, however, that in the event that the current per share market price 
of the Security is determined during a period following the announcement by the
issuer of such Security of (A) a dividend or distribution on such Security
payable in shares of such Security or Securities convertible into such 
shares, or (B) any subdivision, combination or reclassification of such
Security and prior to the expiration of 30 Trading Days after the ex-dividend
date for such dividend or distribution, or the record date for such subdivision,
combination or reclassification, then, and in each such case, the current per
share market price shall be appropriately adjusted to reflect the current
market price per share equivalent of such Security.  The closing price for each
day shall be the last sale price, regular way, or, in case no such sale takes
place on such day, the average of the closing bid and asked prices, regular
way, in either case as reported in the principal consolidated transaction
reporting system with respect to securities listed or admitted to trading on
the New York Stock Exchange or, if the Security is not listed or admitted to
trading on the New York Stock Exchange, as reported in the principal
consolidated transaction reporting system with respect to securities listed on
the principal national securities exchange on which the Security is listed or
admitted to trading or, if the Security is not listed or admitted to trading on
any national securities exchange, the last quoted price or, if not so quoted,
the average of the high bid and low asked prices in the over-the-counter

                                -15-

<PAGE>

market, as reported by the National Association of Securities Dealers, Inc.
Automated Quotations Systems ("NASDAQ") or such other system then in use, or,
if on any such date the Security is not quoted by any such organization, the
average of the closing bid and asked prices as furnished by a professional
market marker making a market in the Security selected by the Board of
Directors of the Company.  The term "Trading Day" shall mean a day on which the
principal national securities exchange on which the Security is listed or
admitted to trading is open for the transaction of business or, if the Security
is not listed or admitted to trading on any national securities exchange, a
Business Day.

                (ii)  For the purpose of any computation hereunder, the
"current per share market price" of the Preferred Shares shall be determined in
accordance with the method set forth in Section 11(d)(i).  If the Preferred
Shares are not publicly traded, the "current per share market price" of the
Preferred Shares shall be conclusively deemed to be the current per share
market price of the Common Shares as determined pursuant to Section 11(d)(i)
(appropriately adjusted to reflect any stock split, stock dividend or similar
transaction occurring after the date hereof), multiplied by one hundred.  If
neither the Common Shares nor the Preferred Shares are publicly held or so
listed or traded, "current per share market price" shall mean the fair value
per share as determined in good faith by the Board of Directors of the Company,
whose determination shall be described in a statement filed with the Rights
Agent.

                (e)     No adjustment in the Purchase Price shall be required
unless such adjustment would require an increase or decrease of at least 1% in
the Purchase Price; provided, however, that any adjustments which by reason of
this Section 11(e) are not required to be made shall be carried forward and
taken into account in any subsequent adjustment.  All calculations under this
Section 11 shall be made to the nearest cent or to the nearest one one-
millionth of a Preferred Share or one ten-thousandth of any other share or
security as the case may be.  Notwithstanding the first sentence of this
Section 11(e) any adjustment required by this Section 11 shall be made no 
later than the earlier of (i) three years from the date of the transaction
which requires such adjustment or (ii) the date of the expiration of the right
to exercise any Rights.

                                -16-

<PAGE>

                (f)     If as a result of an adjustment made pursuant to
Section 11(a) hereof, the holder of any Right thereafter exercised shall become
entitled to receive any shares of capital stock of the Company other than
Preferred Shares, thereafter the number of such other shares so receivable upon
exercise of a Right shall be subject to adjustment from time to time in a
manner and on terms as nearly equivalent as practicable to the provisions with
respect to the Preferred Shares contained in Section 11(a) through (c),
inclusive, and the provisions of Sections 7, 9, 10 and 13 with respect to the
Preferred Shares shall apply on like terms to any such other share.

                (g)     All Rights originally issued by the Company subsequent
to any adjustment made to the Purchase Price hereunder shall evidence the right
to purchase, at the adjusted Purchase Price, the number of one one-hundredths
of a Preferred Share purchasable from time to time hereunder upon exercise of
the Rights, all subject to further adjustment as provided herein.

                (h)     Unless the Company shall have exercised its election as
provided in Section 11(i), upon each adjustment of the Purchase Price as a
result of the calculations made in Sections 11(b) and (c), each Right
outstanding immediately prior to the making of such adjustment shall thereafter
evidence the right to purchase, at the adjusted Purchase Price, that number of
one one-hundredths of a Preferred Share (calculated to the nearest one one-
millionth of a Preferred Share) obtained by (i) multiplying (x) the number of
one one-hundredths of a share covered by a Right immediately prior to this
adjustment by (y) the Purchase Price in effect immediately prior to such
adjustment of the Purchase Price and (ii) dividing the product so obtained by
the Purchase Price in effect immediately after such adjustment of the Purchase
Price.

                (i)     The Company may elect on or after the date of any
adjustment of the Purchase Price to adjust the number of Rights, in
substitution for any adjustment in the number of one one-hundredths of a
Preferred Share purchasable upon the exercise of a Right.  Each of the Rights
outstanding after such adjustment of the number of Rights shall be exercisable
for the number of one one-hundredths of a Preferred Share for which a Right was
exercisable immediately prior to such adjustment.  Each Right held of record
prior to such adjustment of the number of Rights shall become that number of
Rights (calculated to the nearest one ten-thousandth) obtained by dividing the

                                -17-

<PAGE>

Purchase Price in effect immediately prior to adjustment of the Purchase Price
by the Purchase Price in effect immediately after adjustment of the Purchase
Price.  The Company shall make a public announcement of its election to adjust
the number of Rights, indicating the record date or the adjustment, and, if
known at the time, the amount of the adjustment to be made.  This record date
may be the date on which the Purchase Price is adjusted or any day thereafter,
but, if the Right Certificates have been issued, shall be at least 10 days
later than the date of the public announcement.  If Right Certificates have
been issued, upon each adjustment of the number of Rights pursuant to this
Section 11(i), the Company shall, as promptly as practicable, cause to be
distributed to holders of record of Right Certificates on such record date
Right Certificates evidencing, subject to Section 14 hereof, the additional
Rights to which such holders shall be entitled as a result of such adjustment,
or, at the option of the Company, shall cause to be distributed to such holders
of record in substitution and replacement for the Right Certificates held by
such holders prior to the date of adjustment, and upon surrender thereof, if
required by the Company, new Right Certificates evidencing all the Rights to
which such holders shall be entitled after such adjustment.  Right Certificates
so to be distributed shall be issued, executed and countersigned in the manner
provided for herein and shall be registered in the names of the holders of
record of Right Certificates on the record date specified in the public
announcement.

                (j)     Irrespective of any adjustment or change in the
Purchase Price or the number of one one-hundredths of a Preferred Share
issuable upon the exercise of the Rights, the Right Certificates theretofore
and thereafter issued may continue to express the Purchase Price and the number
of one one-hundredths of a Preferred Share which were expressed in the initial
Right Certificates issued hereunder.

                (k)     Before taking any action that would cause an adjustment
reducing the Purchase Price below one one-hundredth of the then par value, if
any, of the Preferred Shares issuable upon exercise of the Rights, the Company
shall take any corporate action which may, in the opinion of its counsel, be
necessary in order that the Company may validly and legally issue fully paid
and nonassessable Preferred Shares at such adjusted Purchase Price.

                                -18-

<PAGE>


                (l)     In any case in which this Section 11 shall require that
an adjustment in the Purchase Price be made effective as of a record date for a
specified event, the Company may elect to defer until the occurrence of such
event the issuing to the holder of any Right exercised after such record date
of the Preferred Shares and other capital stock or securities of the Company,
if any, issuable upon such exercise over and above the Preferred Shares and
other capital stock or securities of the Company, if any, issuable upon such
exercise on the basis of the Purchase Price in effect prior to such adjustment,
provided, however, that the Company shall deliver to such holder a due bill or
other appropriate instrument evidencing such holder's right to receive such
additional shares upon the occurrence of the event requiring such adjustment.

                (m)     Anything in this Section 11 to the contrary
notwithstanding, the Company shall be entitled to make such reductions in the
Purchase Price, in addition to those adjustments expressly required by this
Section 11, as and to the extent that it in its sole discretion shall determine
to be advisable in order that any consolidation or subdivision of the Preferred
Shares, issuance wholly for cash of any Preferred Shares at less than 
the current market price, issuance wholly for cash of Preferred Shares or
securities which by their terms are convertible into or exchangeable for
Preferred Shares, dividends on Preferred Shares payable in Preferred Shares or
issuance of rights, options or warrants referred to hereinabove in Section
11(b), hereafter made by the Company to holders of its Preferred Shares shall
not be taxable to such stockholders.

                (n)     In the event that at any time after the date of this
Agreement and prior to the Distribution Date, the Company shall (i) declare or
pay any dividend on the Common Shares payable in Common Shares or (ii) effect a
subdivision, combination, or consolidation of the Common Shares (by
reclassification or otherwise than by payment of dividends in Common Shares
into a greater or lesser number of Common Shares, then in any such case (A) the
number of one one-hundredths of a Preferred Share purchasable after such event
upon proper exercise of each Right shall be determined by multiplying the
number of one one-hundredths of a Preferred Share so purchasable immediately
prior to such event by a fraction, the numerator of which is the number of
Common Shares outstanding immediately before such event and the denominator of
which is the number of Common Shares outstanding immediately after such event,

                                -19-

<PAGE>

and (B) each Common Share outstanding immediately after such event shall have
issued with respect to it that number of Rights which each Common Share
outstanding immediately prior to such event had issued with respect to it.
The adjustments provided for in this Section 11(n) shall be made successively
whenever such a dividend is declared or paid or such a subdivision, combination
or consolidation is effected.

                Section 12.  Certificate of Adjusted Purchase Price or Number
of Shares.  Whenever an adjustment is made as provided in Section 11 or 13
hereof, the Company shall promptly (a) prepare a certificate setting forth such
adjustment, and a brief statement of the facts accounting for such adjustment,
(b) file with the Rights Agent and with each transfer agent for the Common
Shares or the Preferred Shares a copy of such certificate and (c) mail a brief
summary thereof to such holder of a Right Certificate in accordance with
Section 25 hereof.

                Section 13.  Consolidation, Merger or Sale or Transfer of
Assets or Earning Power.  In the event, directly or indirectly, at any time
after a Person has become an Acquiring Person, (a) the Company shall
consolidate with, or merge with and into, any other Person, (b) any Person
shall consolidate with the Company, or merge with and into the Company and the
Company shall be the continuing or surviving corporation of such merger and, in
connection with such merger, all or part of the Common Shares shall be changed
into or exchanged for stock or other securities of any other Person (or the
Company) or cash or any other property, or (c) the Company shall sell or
otherwise transfer (or one or more of its Subsidiaries shall sell or otherwise
transfer), in one or more transactions, assets or earning power aggregating 50%
or more of the assets or earning power of the Company and its Subsidiaries
(taken as a whole) to any other Person other than the Company or one or more of
its wholly-owned Subsidiaries, then, and in each such case, proper provision
shall be made so that (i) each holder of a Right (except as otherwise provided
herein) shall thereafter have the right to receive, upon the exercise thereof
at a price equal to the then current Purchase Price multiplied by the number of
one one-hundredths of a Preferred Share for which a Right is then exercisable
in accordance with the terms of this Agreement and in lieu of Preferred Shares,
such number of Common Shares of such other Person (including the Company as
successor thereto or as the surviving corporation) as shall equal the result

                                -20-

<PAGE>

obtained by (A) multiplying the then current Purchase Price by the number of
one one-hundredths of a Preferred Share for which a Right is then exercisable
and dividing that product by (B) 50% of the then current per share market price
of the Common Shares of such other Person (determined pursuant to Section 11(d)
hereof) on the date of consummation of such consolidation, merger, sale or
transfer; (ii) the issuer of such Common Shares shall thereafter be liable for,
and shall assume by virtue of such consolidation, merger, sale or transfer, all
the obligations and duties of the Company pursuant to this Agreement; (iii) the
term "Company" shall thereafter be deemed to refer to such issuer; and (iv)
such issuer shall take such steps (including, but not limited to, the
reservation of a sufficient number of its Common Shares in accordance with
Section 9 hereof) in connection with such consummation as may be necessary to
assure that the provisions hereof shall thereafter be applicable, as nearly as
reasonably may be, in relation to the Common Shares thereafter deliverable upon
the exercise of the Rights.  The Company shall not consummate any such
consolidation, merger, sale or transfer unless prior thereto the Company and
such issuer shall have executed and delivered to the Rights Agent a
supplemental agreement so providing.  The Company shall not enter into any
transaction of the kind referred to in this Section 13 if at the time of such
transaction there are any rights, warrants, instruments or securities
outstanding or any agreements or arrangements which, as a result of the
consummation of such transaction, would eliminate or substantially diminish the
benefits intended to be afforded by the Rights.  The provisions of this Section
13 shall similarly apply to successive mergers or consolidations or sales or
other transfers.

                Section 14.  Fractional Rights and Fractional Shares.  (a)  The
Company shall not be required to issue fractions of Rights or to distribute
Right Certificates which evidence fractional Rights.  In lieu of such
fractional Rights, there shall be paid to the registered holders of the Right
Certificates with regard to which such fractional Rights would otherwise be
issuable, an amount in cash equal to the same fraction of the current market
value of a whole Right.  For the purposes of this Section 14(a), the current
market value of a whole Right shall be the closing price of the Rights for the
Trading Day immediately prior to the date on which such fractional Rights would
have been otherwise issuable.  The closing price for any day shall be the last
sale price, regular way, or, in case no such sale takes place on such day, the

                                -21-

<PAGE>

average of the closing bid and asked prices, regular way, in either case as
reported in the principal consolidated transaction reporting system with
respect to securities listed or admitted to trading on the New York Stock
Exchange or, if the Rights are not listed or admitted to trading on the New
York Stock Exchange, as reported in the principal consolidated transaction
reporting system with respect to securities listed on the principal national
securities exchange on which the Rights are listed or admitted to trading or,
if the Rights are not listed or admitted to trading on any national securities
exchange, the last quoted price or, if not so quoted, the average of the high
bid and low asked prices in the over-the-counter market, as reported by NASDAQ
or such other system then in use or, if on any such date the Rights are not
quoted by any such organization, the average of the closing bid and asked
prices as furnished by a professional market maker making a market in the
Rights selected by the Board of Directors of the Company.  If on any such date
no such market maker is making a market in the Rights, the fair value of the
Rights on such date as determined in good faith by the Board of Directors of
the Company shall be used.

                (b)     The Company shall not be required to issue fractions of
Preferred Shares (other than fractions which are integral multiples of one
one-hundredth of a Preferred Share) upon exercise of the Rights or to
distribute certificates which evidence fractional Preferred Shares (other than
fractions which are integral multiples of one one-hundredth of a Preferred
Share).  Fractions of Preferred Shares in integral multiples of one one-
hundredth of a Preferred Share may, at the election of the Company, be
evidenced by depositary receipts, pursuant to an appropriate agreement between
the Company and a depositary selected by it; provided, that such agreement
shall provide that the holders of such depositary receipts shall have all the
rights, privileges and preferences to which they are entitled as beneficial
owners of the  Preferred Shares represented by such depositary receipts.  In
lieu of fractional Preferred Shares that are not integral multiples of one one-
hundredth of a Preferred Share, the Company shall pay to the registered holders
of Right Certificates at the time such Rights are exercised as herein provided
an amount in cash equal to the same fraction of the current market value of one

                                -22-

<PAGE>

Preferred Share.  For the purposes of this Section 14(b), the current market
value of a Preferred Share shall be the closing price of a Preferred Share (as
determined pursuant to the second sentence of Section 11(d)(i) hereof) for the
Trading Day immediately prior to the date of such exercise.

                (c)     The holder of a Right by the acceptance of the Right
expressly waives his right to receive any fractional Rights or Lay fractional
shares upon exercise of a Right (except as provided above).

                Section 15.  Rights of Action.  All rights of action in respect
of this Agreement, excepting the rights of action given to the Rights Agent
under Section 18 hereof, are vested in the respective registered holders of the
Right Certificates (and, prior to the Distribution Date, the registered holders
of the Common Shares); and any registered holder of any Right Certificate (or,
prior to the Distribution Date, of the Common Shares), without the consent of
the Rights Agent or of the holder of any other Right Certificate (or, prior to
the Distribution Date, of the Common Shares), may, in his own behalf and for
his own benefit, enforce, and may institute and maintain any suit, action or
proceeding against the Company to enforce, or otherwise act in respect of, his
right to exercise the Rights evidenced by such Right Certificate in the manner
provided in such Right Certificate and in this Agreement.  Without limiting the
foregoing or any remedies available to the holders of Rights, it is
specifically acknowledged that the holders of Rights would not have an adequate
remedy at law for any breach of this Agreement and will be entitled to specific
performance of the obligations under, and injunctive relief against actual or
threatened violations of the obligations of any Person subject to, this
Agreement.

                Section 16.  Agreement of Right Holders.  Every holder of a
Right, by accepting the same, consents and agrees with the Company and the
Rights Agent and with every other holder of a Right that:

                (a)     prior to the Distribution Date, the Rights Will be
transferable only in connection with the transfer of the Common Shares;

                (b)     after the Distribution Date, the Right Certificates
are transferable only on the registry books of the Rights Agent if surrendered
at the principal office of the Rights Agent, duly endorsed or accompanied by a
proper instrument of transfer; and

                (c)     the Company and the Rights Agent may deem and treat the
person in whose name the Right Certificate (or, prior to the Distribution Date,

                                -23-

<PAGE>

the associated Common Shares certificate) is registered as the absolute owner
thereof and of the Right, evidenced thereby (notwithstanding any notations of
ownership or writing on the Right Certificates or the associated Common Shares
certificate made by anyone other than the Company or the Rights Agent) for all
purposes whatsoever, and neither the Company nor the Rights Agent shall be
affected by any notice to the contrary.

                Section 17.  Right Certificate Holder Not Deemed a Stockholder.
No holder, as such, of any Right Certificate shall be entitled to vote, receive
dividends or be deemed for any purpose the holder of the Preferred Shares or
any other securities of the Company which may at any time be issuable on the
exercise of the Rights represented thereby, nor shall anything contained herein
or in any Right Certificate be construed to confer upon the holder of any Right
Certificate, as such, any of the rights of a stockholder of the Company or any
right to vote for the election of directors or upon any matter submitted to
stockholders at any meeting thereof, or to give or withhold consent to any
corporate action, or to receive notice of meetings or other actions affecting
stockholders (except as provided in Section 25 hereof), or to receive dividends
or subscription rights, or otherwise, until the Right or Rights evidenced by
such Right Certificate shall have been exercised in accordance with the
provisions hereof.

                Section 18.  Concerning the Rights Agent.  The Company agrees
to pay to the Rights Agent reasonable compensation for all services rendered by
it hereunder and, from time to time, on demand of the Rights Agent, its
reasonable expenses and counsel fees and other disbursements incurred in the
administration and execution of this Agreement and the exercise and performance
of its duties hereunder.  The Company also agrees to indemnify the Rights Agent
for, and to hold it harmless against, any loss, liability, or expense, incurred
without negligence, bad faith or willful misconduct on the part of the Rights
Agent, for anything done or omitted by the Rights Agent in connection with the
acceptance and administration of this Agreement, including the costs and
expenses of defending against any claim of liability in the premises.

                The Rights Agent shall be protected and shall incur no
liability for, or in respect of any action taken, suffered or omitted by it in
connection with, its administration of this Agreement in reliance upon any

                                -24-

<PAGE>

Right Certificate or certificate for the Preferred Shares or Common Shares or
for other securities of the Company, instrument of assignment or transfer,
power of attorney, endorsement, affidavit, letter, notice, direction, consent,
certificate, statement, or other paper or document believed by it to be genuine
and to be signed, executed and, where necessary, verified or acknowledged, by
the proper person or persons, or otherwise upon the advice of counsel as set
forth in Section 20 hereof.

                Section 19.  Merger or Consolidation or Change of Name of
Rights Agent.  Any corporation into which the Rights Agent or any successor
Rights Agent may be merged or with which it may be consolidated, or any
corporation resulting from any merger or consolidation to which the Rights
Agent or any successor Rights Agent shall be a party, or any corporation
succeeding to the stock transfer or corporate trust powers of the Rights Agent
or any successor Rights Agent, shall be the successor to the Rights Agent under
this Agreement without the execution or filing of any paper or any further act
on the part of any of the parties hereto; provided, that such corporation would
be eligible for appointment as a successor Rights Agent under the provisions of
Section 21 hereof.  In case at the time such successor Rights Agent shall
succeed to the agency created by this Agreement, any of the Right Certificates
shall have been countersigned but not delivered, any such successor Rights
Agent may adopt the countersignature of the predecessor Rights Agent and
deliver such Right Certificates so countersigned; and in case at that time any
of the Right Certificates shall not have been countersigned, any successor
Rights Agent may countersign such Right Certificates either in the name of the
predecessor Rights Agent or in the name of the successor Rights Agent; and in
all such cases such Right Certificates shall have the full force provided in
the Right Certificates and in this Agreement.

                In case at any time the name of the Rights Agent shall be
changed and at such time any of the Right Certificates shall have been
countersigned but not delivered, the Rights Agent may adopt the
countersignature under its prior name and deliver Right Certificates so
countersigned; and in case at that time any of the Right Certificates shall not
have been countersigned, the Rights Agent may countersign such Right
Certificates either in its prior name or in its changed name and in all such
cases such Right Certificates shall have the full force provided in the Right
Certificates and in this Agreement.

                                -25-

<PAGE>

                Section 20.  Duties of Rights Agent.  The Rights Agent
undertakes the duties and obligations imposed by this Agreement upon the
following terms and conditions, by all of which the Company and the holders of
Right Certificates, by their acceptance thereof, shall be bound:

                (a)     The Rights Agent may consult with legal counsel (who
may be legal counsel for the Company), and the opinion of such counsel shall be
full and complete authorization and protection to the Rights Agent as to any
action taken or omitted by it in good faith and in accordance with such
opinion.

                (b)     Whenever in the performance of its duties under this
Agreement the Rights Agent shall deem it necessary or desirable that any fact
or matter be proved or established by the Company prior to taking or suffering
any action hereunder, such fact or matter (unless other evidence in respect
thereof be herein specifically prescribed) may be deemed to be conclusively
proved and established by a certificate signed by any one of the Chairman of
the Board, the Chief Executive Officer, the President, any Vice President, the
Treasurer or the Secretary of the Company and delivered to the Rights Agent;
and such certificate shall be full authorization to the Rights Agent for any
action taken or suffered in good faith by it under the provisions of this
Agreement in reliance upon such certificate.

                                -26-

<PAGE>

                (c)     The Rights Agent shall be liable hereunder to the
Company and any other Person only for its own negligence, bad faith or willful
misconduct.

                (d)     The Rights Agent shall not be liable for or by reason
of any of the statements of fact or recitals contained in this Agreement or in
the Right Certificates (except its Countersignature thereof) or be required to
verify the same, but all such statements and recitals are and shall be deemed
to have been made by the Company only.

                (e)     The Rights Agent shall not be under any responsibility
in respect of the validity of this Agreement or the execution and delivery
hereof (except the due execution hereof by the Rights Agent) or in respect of
the validity or execution of any Right Certificate (except its countersignature
thereof); nor shall it be responsible for any breach by the Company of any
covenant or condition contained in this Agreement or in any Right Certificate;
nor shall it be responsible for any change in the exercisability of the Right,
(including the Rights becoming void pursuant to Section 11(a)(ii) hereof) or
any adjustment in the terms of the Rights (including the manner, method or
amount thereof) provided for in Section 3, 11, 13, 23 or 24, or the
ascertaining of the existence of facts that would require any such change or
adjustment (except with respect to the exercise of Rights evidenced by Right
Certificates after actual notice that such change or adjustment is required);
nor shall it by any act hereunder be deemed to make any representation or
warranty as to the authorization or reservation of any Preferred Shares to be
issued pursuant to this Agreement or any Right Certificate or as to whether any
Preferred Shares will, when issued, be validly authorized and issued, fully
paid and nonassessable.

                (f)     The Company agrees that it will perform, execute,
acknowledge and deliver or cause to be performed, executed, acknowledged and
delivered all such further and other acts, instruments and assurances as may
reasonably be required by the Rights Agent for the carrying out or performing
by the Rights Agent of the provisions of this Agreement.

                                -27-

<PAGE>

                (g)     The Rights Agent is hereby authorized and directed to
accept instructions with respect to the performance of its duties hereunder
from any one of the Chairman of the Board, the Chief Executive Officer, any
Vice President, the Secretary or the Treasurer of the Company, and to apply to
such officers for advice or instructions in connection with its duties, and it
shall not be liable for any action taken or suffered by it in good faith in
accordance with instructions of any such officer or for any delay in acting
while waiting for those instructions.

                (h)     The Rights Agent and any stockholder, director, officer
or employee of the Rights Agent may buy, sell or deal in any of the Rights or
other securities of the Company or become pecuniarily interested in any
transaction in which the Company may be interested, or contract with or lend
money to the Company or otherwise act as fully and freely as though it were not
Rights Agent under this Agreement.  Nothing herein shall preclude the Rights
Agent from acting in any other capacity for the Company or for any other legal
entity.

                (i)     The Rights Agent may execute and exercise any of the
rights or powers hereby vested in it or perform any duty hereunder either
itself or by or through its attorneys or agents, and the Rights Agent shall not
be answerable or accountable for any act, default, neglect or misconduct of any
such attorneys or agents or for any loss to the Company resulting from any such
act, default, neglect or misconduct, provided reasonable care was exercised in
the selection and continued employment thereof.

                Section 21.  Change of Rights Agent.  The Rights Agent or any
successor Rights Agent may resign and be discharged from its duties under this
Agreement upon 30 days' notice in writing mailed to the Company and to each
transfer agent of the Common Shares or Preferred Shares by registered or
certified mail, and to the holders of the Right Certificates by first-class
mail.  The Company may remove the Rights Agent or any successor Rights Agent
upon 30 days' notice in writing, mailed to the Rights Agent or successor Rights
Agent, as the case may be, and to each transfer agent of the Common Shares or
Preferred Shares by registered or certified mail, and to the holders of the
Right Certificates by first-class mail.  If the Rights Agent shall resign or be
removed or shall otherwise become incapable of acting, the Company shall
appoint a successor to the Rights Agent.  If the Company shall fail to make
such appointment within a period of 30 days after giving notice of such removal

                                -28-

<PAGE>

or after it las been notified in writing of such resignation or incapacity by
the resigning or incapacitated Rights Agent or by the holder of a Right
Certificate (who shall, with such notice, submit his Right Certificate for
inspection by the Company), then the registered holder of any Right Certificate
may apply to any court of competent jurisdiction for the appointment of a new
Rights Agent.  Any successor Rights Agent, whether appointed by the Company or
by such a court, shall be a corporation organized and doing business under the
laws of the United States or of the State of New York (or of any other state of
the United States so long as such corporation is authorized to do business as a
banking institution in the State of New York), in good standing, having an
office in the State of New York, which is authorized under such laws to
exercise corporate trust or stock transfer powers and is subject to supervision
or examination by federal or state authority and which has It the time of its
appointment as Rights Agent a combined capital and surplus of at least $50
million.  After appointment, the successor Rights Agent shall be vested with
the same powers, rights, duties and responsibilities as if it had been
originally named as Rights Agent without further act or deed; but the
predecessor Rights Agent shall deliver and transfer the successor Rights Agent
any property at the time held by it hereunder, and execute and deliver any
further assurance, conveyance, act or deed necessary for the purpose.  Not
later than the effective date of any such appointment the Company shall file
notice thereof in writing with the predecessor Rights Agent and each transfer
agent of the Common Shares or Preferred Shares, and mail a notice thereof in
writing to the registered holders of the Right Certificates.  Failure to give
any notice provided for in this Section 21, however, or any defect therein,
shall not affect the legality or validity of the resignation or removal of the
Rights Agent or the appointment of the successor Rights Agent, as the case may
be.

                Section 22.  Issuance of New Right Certificates.
Notwithstanding any of the provisions of this Agreement or of the Rights to the
contrary, the Company may, at its option, issue new Right Certificates
evidencing Rights in such form as may be approved by its Board of Directors to
reflect any adjustment or change in the Purchase Price and the number or kind
or class of shares or other securities or property purchasable under the Right
Certificates made in accordance with the provisions of this Agreement.

                Section 23.  Redemption.  (a)  The Board of Directors of the
Company may, at its option, at any time prior to such time as any Person

                                -29-

<PAGE>

becomes an Acquiring Person, redeem all but not less than all the then
outstanding Rights at a redemption price of $.001 per Right, appropriately
adjusted to reflect any stock split, stock dividend or similar transaction
occurring after the date hereof (such redemption price being hereinafter
referred to as the "Redemption Price").  The redemption of the Rights by the
Board of Directors may be made effective at such time, on such basis and with
such conditions as the Board of Directors in its sole discretion may establish.

                (b)  Immediately upon the action of the Board of Directors of
the Company ordering the redemption of the Rights pursuant to paragraph (a) of
this Section 23, and without any further action and without any notice, the
right to exercise the Rights will terminate and the only right thereafter of
the holders of Rights shall be to receive the Redemption Price.  The Company
shall promptly give public notice of any such redemption; provided, however,
that the failure to give, or any defect in, any such notice shall not affect
the validity of such redemption.  Within 10 days after such action of the Board
of Directors ordering the redemption of the Rights, the Company shall mail a
notice of redemption to all the holders of the then outstanding Rights at their
last addresses as they appear upon the registry books of the Rights Agent or,
prior to the Distribution Date, on the registry books of the transfer agent for
the Common Shares.  Any notice which is mailed in the manner herein provided
shall be deemed given, whether or not the holder receives the notice.  Each
such notice of redemption will state the method by which the payment of the
Redemption Price will be made.  Neither the Company nor any of its Affiliates
or Associates may redeem, acquire or purchase for value any Rights at any time
in any manner other than that specifically set forth in this Section 23 or in
Section 24 hereof, and other than in connection with the purchase of Common
Shares prior to the Distribution Date.

                Section 24.  Exchange.  (a)  The Board of Directors of the
Company may, at its option, at any time after any Person becomes an Acquiring
Person, exchange all or part of the then outstanding and exercisable Rights
(which shall not include Rights that have become void pursuant to the
provisions of Section 11(a)(ii) hereof) for Common Shares at an exchange ratio
of one Common Share per Right, appropriately adjusted to reflect any stock
split, stock dividend or similar transaction occurring after the date hereof
(such exchange ratio being hereinafter referred to as the "Exchange Ratio").

                                -30-

<PAGE>

Notwithstanding the foregoing, the Board of Directors shall not be empowered to
effect such exchange at any time after any Person (other than the Company, any
Subsidiary of the Company, any employee benefit plan of the Company or any such
Subsidiary, or any entity holding Common Shares for or pursuant to the terms of
any such plan or any Person who or which, together with all Affiliates and
Associates of such Person, was the Beneficial Owner of 15% or more of the
outstanding Common Shares of the Company as of the date of this Agreement),
together with all Affiliates and Associates of such Person, becomes the
Beneficial Owner of 50% or more of the Common Shares then outstanding.

                (b)     Immediately upon the action of the Board of Directors
of the Company ordering the exchange of any Rights pursuant to paragraph (a) of
this Section 24 and without any further action and without any notice, the
right to exercise such Rights shall terminate and the only right thereafter of
a holder of such Rights shall be to receive that number of Common Shares equal
to the number of such Rights held by such holder multiplied by the Exchange
Ratio. The Company shall promptly give public notice of any such exchange;
provided, however, that the failure to give, or any defect in, such notice
shall not affect the validity of such exchange.  The Company promptly shall
mail a notice of any such exchange to all of the holders of such Rights at
their last addresses as they appear upon the registry books of the Rights 
Agent.  Any notice which is mailed in the manner herein provided shall be
deemed given, whether or not the holder receives the notice.  Each such notice
of exchange will state the method by which the exchange of the Common Shares
for Rights will be effected and, in the event of any partial exchange, the
number of Rights which will be exchanged.  Any partial exchange shall be
effected pro rata based on the number of Rights (other than Rights which have
become void pursuant to the provisions of Section 11(a)(ii) hereof) held by
each holder of Rights.

                (c)     In the event that there shall not be sufficient Common
Shares issued but not outstanding or authorized but unissued to permit any
exchange of Rights as contemplated in accordance with this Section 24, the
Company shall take all such action as may be necessary to authorize additional
Common Shares for issuance upon exchange of the Rights.  In the event the
Company shall, after good faith effort, be unable to take all such action as

                                -31-

<PAGE>

may be necessary to authorize such additional Common Shares, the Company shall
substitute, for each Common Share that would otherwise be issuable upon
exchange of a Right, a number of Preferred Shares or fraction thereof such that
the current per share market price of one Preferred Share multiplied by such
number or fraction is equal to the current per share market price of one Common
Share as of the date of issuance of such Preferred Shares or fraction thereof.

                (d)     The Company shall not be required to issue fractions of
Common Shares or to distribute certificates which evidence fractional Common
Shares.  In lieu of such fractional Common Shares, the Company shall pay to the
registered holders of the Right Certificates with regard to which such
fractional Common Shares would otherwise be issuable an amount in cash equal to
the same fraction of the current market value of a whole Common Share. For the
purposes of this paragraph (d), the current market value of a whole Common
Share shall be the closing price of a Common Share (as determined pursuant to
the second sentence of Section 11(d)(i) hereof) for the Trading Day immediately
prior to the date of exchange pursuant to this Section 24.

                Section 25.  Notice of Certain Events.  (a)   In case the
Company shall propose (i) to pay any dividend payable in stock of any class to
the holders of its Preferred Shares or to make any other distribution to the
holders of its Preferred Shares (other than a regular quarterly cash dividend),
(ii) to offer to the holders of its Preferred Shares rights or warrants to
subscribe for or to purchase any additional Preferred Shares or shares of stock
of any class or any other securities, rights or options, (iii) to effect any
reclassification of its Preferred Shares (other than a reclassification
involving only the subdivision of outstanding Preferred Shares), (iv) to effect
any consolidation or merger into or with, or to effect any sale or other
transfer (or to permit one or more of its Subsidiaries to effect any sale or
other transfer), in one or more transactions, of 50% or more of the assets or
earning power of the Company and its Subsidiaries (taken as a whole) to, any
other Person, (v) to effect the liquidation, dissolution or winding up of the
Company, or (vi) to declare or pay any dividend on the Common Shares payable in
Common Shares or to effect a subdivision, combination or consolidation of the
Common Shares (by reclassification or otherwise than by payment of dividends in
Common Shares), then, in each such case, the Company shall give to each holder

                                -32-

<PAGE>

of a Right Certificate, in accordance with Section 26 hereof, a notice of such
proposed action, which shall specify the record date for the purposes of such
stock dividend, or distribution of rights or warrants, or the date on which
such reclassification, consolidation, merger, sale, transfer, liquidation,
dissolution, or winding up is to take place and the date of participation
therein by the holders of the Common Shares and/or Preferred Shares, if any
such date is to be fixed, and such notice shall be so given in the case of any
action covered by clause (i) or (ii) above at least 10 days prior to the record
date for determining holders of the Preferred Shares for purposes of such
action, and in the case of any such other action, at least 10 days prior to the
date of the taking of such proposed action or the date of participation therein
by the holders of the Common Shares and/or Preferred Shares, whichever shall be
the earlier.

                (b)  In case the event set forth in Section 11(a)(ii) hereof
shall occur, then the Company shall as soon as practicable thereafter give to
each holder of a Right Certificate, in accordance with Section 26 hereof, a
notice of the occurrence of such event, which notice shall describe such event
and the consequences of such event to holders of Rights under Section 11(a)(ii)
hereof.

                Section 26.  Notices.  Notices or demands authorized by this
Agreement to be given or made by the Rights Agent or by the holder of any Right
on the Company shall be sufficiently given or made if sent by firstclass mail,
postage prepaid, addressed (until another address is filed in writing with the
Rights Agent) as follows:

                Immunomedics, Inc.
                300 American Road
                Morris Plains, New York 07950

                Attention:  Corporate Secretary


Subject to the provisions of Section 21 hereof, any notice or demand authorized
by this Agreement to be given or made by the Company or by the holder of any
Right Certificate to or on the Rights Agent shall be sufficiently given or made
if sent by first-class mail, postage prepaid, addressed (until another address
is filed in writing with the Company) as follows:

                American Stock Transfer and
                Trust Company
                40 Wall Street
                New York, New York  10005

                Attention:  Administration Department


                                -33-

<PAGE>

Notices or demands authorized by this Agreement to be given or made by the
Company or the Rights Agent to the holder of any Right Certificate shall be
sufficiently given or made if sent by first-class mail, postage prepaid,
addressed to such holder at the address of such holder as shown on the registry
books of the Company.

                Section 27.  Supplements and Amendments.  The Company may from
time to time supplement or amend this Agreement without the approval of any
holders of Right Certificates in order to cure any ambiguity, to correct or
supplement any provision contained herein which may be defective or
inconsistent with any other provisions herein, or to make any other provisions
with respect to the Rights which the Company may deem necessary or desirable,
any such supplement or amendment to be evidenced by a writing signed by the
Company and the Rights Agent; provided, however, that from and after such time
as any Person becomes an Acquiring Person, this Agreement shall not be amended
in any manner which would adversely affect the interests of the holders of
Rights.  Without limiting the foregoing, the Company may at any time prior to
such time as any Person becomes an Acquiring Person amend this Agreement to
lower the thresholds set forth in Sections 1(a) and 3(a) to not less than the
greater of (i) the sum of .001% and the largest percentage of the outstanding
Common Shares then known by the Company to be beneficially owned by any Person
(other than the Company, any Subsidiary of the Company, any employee benefit
plan of the Company or any Subsidiary of the Company, or any entity holding
Common Shares for or pursuant to the terms of any such plan or any Person who
or which, together with all Affiliates and Associates of such Person, was the
Beneficial Owner of 15% or more of the outstanding Common Shares of the Company
as of the date of this Agreement) and (ii) 10%.

                Section 28.  Successors.  All the covenants and provisions of
this Agreement by or for the benefit of the Company or the Rights Agent shall
bind and inure to the benefit of their respective successors and assigns
hereunder.

                                -34-

<PAGE>


                Section 29.  Benefits of this Agreement.  Nothing in this
Agreement shall be construed to give to any person or corporation other than
the Company, the Rights Agent and the registered holders of the Right
Certificates (and, prior to the Distribution Date, the Common Shares) any legal
or equitable right, remedy or claim under this Agreement; but this Agreement
shall be for the sole and exclusive benefit of the Company, the Rights Agent
and the registered holders of the Right Certificates (and, prior to the
Distribution Date, the Common Shares).

                Section 30.  Severability.  If any term, provision, covenant or
restriction of this Agreement is held by a court of competent jurisdiction or
other authority to be invalid, void or unenforceable, the remainder of the
terms, provisions, covenants and restrictions of this Agreement shall remain in
full force and effect and shall in no way be affected, impaired or invalidated.

                Section 31.  Governing Law.  This Agreement and each Right
Certificate issued hereunder shall be deemed to be a contract made under the
laws of the State of New York for all purposes shall be governed by and
construed in accordance with the laws of such State applicable to contracts to
be made and performed entirely within such State.

                Section 32.  Counterparts.  This Agreement may be executed in
any number of counterparts and each of such counterparts shall for all purposes
be deemed to be an original, and all such counterparts shall together
constitute but one and the same instrument.

                Section 33.  Descriptive Headings.  Descriptive headings of the
several Sections of this Agreement are inserted for convenience only and shall
not control or affect the meaning or construction of any of the provisions
hereof.

                                -35-

<PAGE>


                IN WITNESS WHEREOF, the parties hereto have caused this
Agreement to be duly executed and attested, all as of the day and year first
above written.

                                                        IMMUNOMEDICS, INC.
Attest:


By ___________________                                  By ___________________
    Title:                                                  Title:


Attest:                                                 AMERICAN STOCK TRANSFER
                                                         AND TRUST COMPANY



By ___________________                                  By ___________________
    Title:                                                   Title:

                                -36-

<PAGE>



                                                                     Exhibit A

                        CERTIFICATE OF DESIGNATIONS

                                    of

               SERIES E JUNIOR PARTICIPATING PREFERRED STOCK

                                    of

                            IMMUNOMEDICS, INC.

                     (Pursuant to Section 151 of the
                    Delaware General Corporation Law)

                 _______________________________________


                Immunomedics, Inc., a corporation organized and existing under
the General Corporation Law of the State of Delaware (hereinafter called the
"Corporation"), hereby certifies that the following resolution was adopted by
the Board of Directors of the Corporation as required by Section 151 of the
General Corporation Law at a meeting duly called and held on January 23, 1998:

                RESOLVED, that pursuant to the authority granted to and vested
in the Board of Directors of this Corporation (hereinafter called the "Board of
Directors" or the "Board") in accordance with the provisions of the Certificate
of Incorporation, the Board of Directors hereby creates a series of Preferred
Stock, par value $.01 per share (the "Preferred Stock"), of the Corporation and
hereby states the designation and number of shares, and fixes the relative
rights, preferences, and limitations thereof as follows:

                Series E Junior Participating Preferred Stock:

                Section 1.  Designation and Amount.  The shares of such series
shall be designated as "Series E Junior Participating Preferred Stock" (the
"Series E Preferred Stock") and the number of shares constituting the Series
E Preferred Stock shall be 1,000,000.  Such number of shares may be increased
or decreased by resolution of the Board of Directors; provided, that no
decrease shall reduce the number of shares of Series E Preferred Stock to a
number less than the number of shares then outstanding plus the number of
shares reserved for issuance upon the exercise of outstanding options, rights
or warrants or upon the conversion of any outstanding securities issued by the
Corporation convertible into Series E Preferred Stock.

                                -A-1-

<PAGE>

                Section 2.  Dividends and Distributions.

                (A)  Subject to the rights of the holders of any shares of any
series of Preferred Stock (or any similar stock) ranking prior and superior to
the Series E Preferred Stock with respect to dividends, the holders of shares
of Series E Preferred Stock, in preference to the holders of Common Stock, par
value $.01 per share (the "Common Stock"), of the Corporation, and of any other
junior stock, shall be entitled to receive, when, as and if declared by the
Board of Directors out of funds legally available for the purpose, quarterly
dividends payable in cash on the first day of March, June, September and
December in each year (each such date being referred to herein as a "Quarterly
Dividend Payment Date"), commencing on the first Quarterly Dividend Payment
Date after the first issuance of a share or fraction of a share of Series E
Preferred Stock, in an amount per share (rounded to the nearest cent) equal to
the greater of (a) $1.00 or (b) subject to the provision for adjustment
hereinafter set forth, 100 times the aggregate per share amount of all cash
dividends, and 100 times the aggregate per share amount (payable in kind) of
all non-cash dividends or other distributions, other than a dividend payable in
shares of Common Stock or a subdivision of the outstanding shares of Common
Stock (by reclassification or otherwise), declared on the Common Stock since
the immediately preceding Quarterly Dividend Payment Date or, with respect to
the first Quarterly Dividend Payment Date, since the first issuance of any
share or fraction of a share of Series E Preferred Stock.  In the event the
Corporation shall at any time declare or pay any dividend on the Common Stock
payable in shares of Common Stock, or effect a subdivision or combination or
consolidation of the outstanding shares of Common Stock (by reclassification or
otherwise than by payment of a dividend in shares of Common Stock) into a
greater or lesser number of shares of Common Stock, then in each such case the
amount to which holders of shares of Series E Preferred Stock were entitled
immediately prior to such event under clause (b) of the preceding sentence
shall be adjusted by multiplying such amount by a fraction, the numerator of
which is the number of shares of Common Stock outstanding immediately after
such event and the denominator of which is the number of shares of Common Stock
that were outstanding immediately prior to such event.

                (B)  The Corporation shall declare a dividend or distribution
on the Series E Preferred Stock as provided in paragraph (A) of this Section
immediately after it declares a dividend or distribution on the Common Stock
(other than a dividend payable in shares of Common Stock); provided that, in
the event no dividend or distribution shall have been declared on the Common
Stock during the period between any Quarterly Dividend Payment Date and the
next subsequent Quarterly Dividend Payment Date, a dividend of $1.00 per share
on the Series E Preferred Stock shall nevertheless be payable on such
subsequent Quarterly Dividend Payment Date.

                (C)  Dividends shall begin to accrue and be cumulative on
outstanding shares of Series E Preferred Stock from the Quarterly Dividend
Payment Date next preceding the date of issue of such shares, unless the date
of issue of such shares is prior to the record date for the first Quarterly

                                -A-2-

<PAGE>

Dividend Payment Date, in which case dividends on such shares shall begin to
accrue from the date of issue of such shares, or unless the date of issue is a
Quarterly Dividend Payment Date or is a date after the record date for the
determination of holders of shares of Series E Preferred Stock entitled to
receive a quarterly dividend and before such Quarterly Dividend Payment Date,
in either of which events such dividends shall begin to accrue and be
cumulative from such Quarterly Dividend Payment Date.  Accrued but unpaid
dividends shall not bear interest.  Dividends paid on the shares of Series E
Preferred Stock in an amount less than the total amount of such dividends at
the time accrued and payable on such shares shall be allocated pro rata on a
share-by-share basis among all such shares at the time outstanding.  The Board
of Directors may fix a record date for the determination of holders of shares
of Series E Preferred Stock entitled to receive payment of a dividend or
distribution declared thereon, which record date shall be not more than 60 days
prior to the date fixed for the payment thereof.

                Section 3.  Voting Rights.  The holders of shares of Series E
Preferred Stock shall have the following voting rights:

                (A)  Subject to the provision for adjustment hereinafter set
forth, each share of Series E Preferred Stock shall entitle the holder thereof
to 100 votes on all matters submitted to a vote of the stockholders of the
Corporation.  In the event the Corporation shall at any time declare or pay any
dividend on the Common Stock payable in shares of Common Stock, or effect a
subdivision or combination or consolidation of the outstanding shares of Common
Stock (by reclassification or otherwise than by payment of a dividend in shares
of Common Stock) into a greater or lesser number of shares of Common Stock,
then in each such case the number of votes per share to which holders of shares
of Series E Preferred Stock were entitled immediately prior to such event shall
be adjusted by multiplying such number by a fraction, the numerator of which is
the number of shares of Common Stock outstanding immediately after such event
and the denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

                (B)  Except as otherwise provided herein, in any other
Certificate of Designations creating a series of Preferred Stock or any
similar stock, or by law, the holders of shares of Series E Preferred Stock and
the holders of shares of Common Stock and any other capital stock of the
Corporation having general voting rights shall vote together as one class on
all matters submitted to a vote of stockholders of the Corporation.

                (C)  Except as set forth herein, or as otherwise provided by
law, holders of Series E Preferred Stock shall have no special voting rights
and their consent shall not be required (except to the extent they are entitled
to vote with holders of Common Stock as set forth herein) for taking any
corporate action.

                                -A-3-

<PAGE>

                Section 4.  Certain Restrictions.

                (A)  Whenever quarterly dividends or other dividends or
distributions payable on the Series E Preferred Stock as provided in Section
2 are in arrears, thereafter and until all accrued and unpaid dividends and
distributions, whether or not declared, on shares of Series E Preferred Stock
outstanding shall have been paid in full, the Corporation shall not:

                     (i)  declare or pay dividends, or make any other
distributions, on any shares of stock ranking junior (either as to dividends or
upon liquidation, dissolution or winding up) to the Series E Preferred Stock;

                    (ii)  declare or pay dividends, or make any other
distributions, on any shares of stock ranking on a parity (either as to
dividends or upon liquidation, dissolution or winding up) with the Series E
Preferred Stock, except dividends paid ratably on the Series E Preferred Stock
and all such parity stock on which dividends are payable or in arrears in
proportion to the total amounts to which the holders of all such shares are
then entitled;

                   (iii)  redeem or purchase or otherwise acquire for
consideration shares of any stock ranking junior (either as to dividends or
upon liquidation, dissolution or winding up) to the Series E Preferred Stock,
provided that the Corporation may at any time redeem, purchase or otherwise
acquire shares of any such junior stock in exchange for shares of any stock of
the Corporation ranking junior (either as to dividends or upon dissolution,
liquidation or winding up) to the Series E Preferred Stock; or

                    (iv)  redeem or purchase or otherwise acquire for
consideration any shares of Series E Preferred Stock, or any shares of stock
ranking on a parity with the Series E Preferred Stock, except in accordance
with a purchase offer made in writing or by publication (as determined by the
Board of Directors) to all holders of such shares upon such terms as the Board
of Directors, after consideration of the respective annual dividend rates and
other relative rights and preferences of the respective series and classes,
shall determine in good faith will result in fair and equitable treatment
among the respective series or classes.

                (B)  The Corporation shall not permit any subsidiary of the
Corporation to purchase or otherwise acquire for consideration any shares of
stock of the Corporation unless the Corporation could, under paragraph (A) of
this Section 4, purchase or otherwise acquire such shares at such time and in
such manner.

                Section 5.  Reacquired Shares.  Any shares of Series E
Preferred Stock purchased or otherwise acquired by the Corporation in any
manner whatsoever shall be retired and canceled promptly after the acquisition
thereof.  All such shares shall upon their cancellation become authorized but

                                -A-4-

<PAGE>


unissued shares of Preferred Stock and may be reissued as part of a new series
of Preferred Stock subject to the conditions and restrictions on issuance set
forth herein, in the Certificate of Incorporation, or in any other Certificate
of Designations creating a series of Preferred Stock or any similar stock or as
otherwise required by law.

                Section 6.  Liquidation, Dissolution or Winding Up.  Upon any
liquidation, dissolution or winding up of the Corporation, no distribution
shall be made (1) to the holders of shares of stock ranking junior (either as
to dividends or upon liquidation, dissolution or winding up) to the Series E
Preferred Stock unless, prior thereto, the holders of shares of Series E
Preferred Stock shall have received $100 per share, plus an amount equal to
accrued and unpaid dividends and distributions thereon, whether or not
declared, to the date of such payment, provided that the holders of shares of
Series E Preferred Stock shall be entitled to receive an aggregate amount per
share, subject to the provision for adjustment hereinafter set forth, equal to
100 times the aggregate amount to be distributed per share to holders of shares
of Common Stock, or (2) to the holders of shares of stock ranking on a parity
(either as to dividends or upon liquidation, dissolution or winding up) with
the Series E Preferred Stock, except distributions made ratably on the Series E
Preferred Stock and all such parity stock in proportion to the total amounts to
which the holders of all such shares are entitled upon such liquidation,
dissolution or winding up.  In the event the Corporation shall at any time
declare or pay any dividend on the Common Stock payable in shares of Common
Stock, or effect a subdivision or combination or consolidation of the
outstanding shares of Common Stock (by reclassification or otherwise than by
payment of a dividend in shares of Common Stock) into a greater or lesser
number of shares of Common Stock, then in each such case the aggregate amount
to which holders of shares of Series E Preferred Stock were entitled
immediately prior to such event under the proviso in clause (1) of the
preceding sentence shall be adjusted by multiplying such amount by a fraction
the numerator of which is the number of shares of Common Stock outstanding
immediately after such event and the denominator of which is the number of
shares of Common Stock that were outstanding immediately prior to such event.

                Section 7.  Consolidation, Merger, etc.  In case the
Corporation shall enter into any consolidation, merger, combination or other
transaction in which the shares of Common Stock are exchanged for or changed
into other stock or securities, cash and/or any other property, then in any
such case each share of Series E Preferred Stock shall at the same time be
similarly exchanged or changed into an amount per share, subject to the
provision for adjustment hereinafter set forth, equal to 100 times the
aggregate amount of stock, securities, cash and/or any other property (payable
in kind), as the case may be, into which or for which each share of Common
Stock is changed or exchanged.  In the event the Corporation shall at any time
declare or pay any dividend on the Common Stock payable in shares of Common
Stock, or effect a subdivision or combination or consolidation of the
outstanding shares of Common Stock (by reclassification or otherwise than by
payment of a dividend in shares of Common Stock) into a greater or lesser
number of shares of Common Stock, then in each such case the amount set forth

                                -A-5-

<PAGE>

in the preceding sentence with respect to the exchange or change of shares of
Series E Preferred Stock shall be adjusted by multiplying such amount by a
fraction, the numerator of which is the number of shares of Common Stock
outstanding immediately after such event and the denominator of which is the
number of shares of Common Stock that were outstanding immediately prior to
such event.

                Section 8.  No Redemption.  The shares of Series E Preferred
Stock shall not be redeemable.

                Section 9.  Rank.  The Series E Preferred Stock shall rank,
with respect to the payment of dividends and the distribution of assets, junior
to all series of any other class of the Corporation's Preferred Stock.

                Section 10.  Amendment.  The Certificate of Incorporation of
the Corporation shall not be amended in any manner which would materially alter
or change the powers, preferences or special rights of the Series E Preferred
Stock so as to affect them adversely without the affirmative vote of the
holders of at least two-thirds of the outstanding shares of Series E Preferred
Stock, voting together as a single class.

                IN WITNESS WHEREOF, this Certificate of Designations is
executed on behalf of the Corporation by its Chairman of the Board and Chief
Executive Officer and by its Chief Financial Officer and attested by its
Secretary this __ day of January, 1998.



                                                _________________________
                                                David M. Goldenberg
                                                Chairman of the Board and
                                                Chief Executive Officer

Attest:



___________________
Phyllis Parker
Secretary



                                -A-6-

<PAGE>



                                                                     Exhibit B





                                Form of Right Certificate


                           Certificate No. R-     ______ Rights



                NOT EXERCISABLE AFTER JANUARY 23, 2008 OR EARLIER IF 
                REDEMPTION OR EXCHANGE OCCURS. THE RIGHTS ARE SUBJECT 
                TO REDEMPTION AT $.001 PER RIGHT AND TO EXCHANGE ON THE
                TERMS SET FORTH IN THE RIGHTS AGREEMENT.

                                Right Certificate

                                IMMUNOMEDICS, INC.



                This certifies that ______________________, or
registered assigns, is the registered owner of the number of 
Rights set forth above, each of which entitles the owner thereof, 
subject to the terms, provisions and conditions of the Rights 
Agreement, dated as of January 23, 1998 (the "Rights Agreement"), 
between Immunomedics, Inc., a Delaware corporation (the 
"Company"), and American Stock Transfer and Trust Company (the 
"Rights Agent"), to purchase from the Company at any time after 
the Distribution Date (as such term is defined in the Rights 
Agreement) and prior to 5:00 P.M., New York time, on January 23, 
2008 at the principal office of the Rights Agent, or at the 
office of its successor as Rights Agent, one one-hundredth of a 
fully paid non-assessable share of Series E Junior Participating 
Preferred Stock, par value $.01 per share (the "Preferred 
Shares"), of the Company, at a purchase price of $37 per one 
one-hundredth of a Preferred Share (the "Purchase Price"), upon 
presentation and surrender of this Right Certificate with the 
Form of Election to Purchase duly executed.  The number of Rights 
evidenced by this Right Certificate (and the number of one 
one-hundredths of a Preferred Share which may be purchased upon 
exercise hereof) set forth above, and the Purchase Price set 
forth above, are the number and Purchase Price as of January 23, 
1998, based on the Preferred Shares as constituted at such date. 
As provided in the Rights Agreement, the Purchase Price and the 
number of one one-hundredths of a Preferred Share which may be 

                                -B-1-

<PAGE>

purchased upon the exercise of the Rights evidenced by this Right 
Certificate are subject to modification and adjustment upon the 
happening of certain events.

                This Right Certificate is subject to all of the terms, 
provisions and conditions of the Rights Agreement, which terms, 
provisions and conditions are hereby incorporated herein by 
reference and made a part hereof and to which Rights Agreement 
reference is hereby made for a full description of the rights, 
limitations of rights, obligations, duties and immunities 
hereunder of the Rights Agent, the Company and the holders of the 
Right Certificates. Copies of the Rights Agreement are on file at 
the principal executive offices of the Company and the 
above-mentioned offices of the Rights Agent. 

                This Right Certificate, with or without other Right 
Certificates, upon surrender at the principal office of the 
Rights Agent, may be exchanged for another Right Certificate or 
Right Certificates of like tenor and date evidencing Rights 
entitling the holder to purchase a like aggregate number of 
Preferred Shares as the Rights evidenced by the Right Certificate 
or Right Certificates surrendered shall have entitled such holder 
to purchase. If this Right Certificate shall be exercised in 
part, the holder shall be entitled to receive upon surrender 
hereof another Right Certificate or Right Certificates for the 
number of whole Rights not exercised. 

                Subject to the provisions of the Rights Agreement, the 
Rights evidenced by this Certificate (i) may be redeemed by the 
Company at a redemption price of $.001 per Right or (ii) may be 
exchanged in whole or in part for Preferred Shares or shares of 
the Company's Common Stock, par value $.01 per share. 

                No fractional Preferred Shares will be issued upon the 
exercise of any Right or Rights evidenced hereby (other than 
fractions which are integral multiples of one one-hundredth of a 
Preferred Share, which may, at the election of the Company, be 
evidenced by depositary receipts), but in lieu thereof a cash 
payment will be made, as provided in the Rights Agreement. 

                No holder of this Right Certificate shall be entitled 
to vote or receive dividends or be deemed for any purpose the 
holder of the Preferred Shares or of any other securities of the 
Company which may at any time be issuable on the exercise hereof, 
nor shall anything contained in the Rights Agreement or herein be 
construed to confer upon the holder hereof, as such, any of the 
rights of a stockholder of the Company or any right to vote for 
the election of directors or upon any matter submitted to

                                -B-2-

<PAGE>

stockholders at any meeting thereof, or to give or withhold 
consent to any corporate action, or to receive notice of meetings 
or other actions affecting stockholders (except as provided in 
the Rights Agreement), or to receive dividends or subscription 
rights, or otherwise, until the Right or Rights evidenced by this 
Right Certificate shall have been exercised as provided in the 
Rights Agreement. 

                This Right Certificate shall not be valid or obligatory
for any purpose until it shall have been countersigned by the 
Rights Agent. 

                WITNESS the facsimile signature of the proper officers 
of the Company and its corporate seal. 

Dated as of __________________. 

ATTEST:                                         IMMUNOMEDICS, INC.



__________________________      By_______________________________


Countersigned:


AMERICAN STOCK TRANSFER
 AND TRUST COMPANY



By_________________________
    Authorized Signature

                                -B-3-

<PAGE>



                Form of Reverse Side of Right Certificate


                           FORM OF ASSIGNMENT

             (To be executed by the registered holder if such 
            holder desires to transfer the Right Certificate.)


                FOR VALUE RECEIVED _____________________________
hereby sells, assigns and transfers unto _______________________
________________________________________________________________
       (Please print name and address of transferee)
________________________________________________________________ 
this Right Certificate, together with all right, title and 
interest therein, and does hereby irrevocably constitute and 
appoint _____________________ Attorney, to transfer the 
within Right Certificate on the books of the within-named 
Company, with full power of substitution. 



Dated: ___________________



                                                ______________________________
                                                Signature


Signature Guaranteed: 

                Signatures must be guaranteed by an eligible 
guarantor institution (a bank, stock broker, savings and 
loan association or credit union with membership in an 
approved signature guarantee medallion program) pursuant to 
Rule 17Ad-15 of the Securities Exchange Act of 1934.  

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

                The undersigned hereby certifies that the Rights 
evidenced by this Right Certificate are not beneficially 
owned by an Acquiring Person or an Affiliate or Associate 
thereof (as defined in the Rights Agreement).


                                                ______________________________
                                                Signature

                                -B-4-

<PAGE>


              Form of Reverse Side of Right Certificate -- continued


                          FORM OF ELECTION TO PURCHASE

                  (To be executed if holder desires to exercise
                   Rights represented by the Right Certificate.) 

To:     IMMUNOMEDICS, INC.

                The undersigned hereby irrevocably elects to exercise 
______________________ Rights represented by this Right 
Certificate to purchase the Preferred Shares issuable
upon the exercise of such Rights and requests that 
certificates for such Preferred Shares be issued in the name 
of:

Please insert social security
or other identifying number 

____________________________________________________________
        (Please print name and address)
____________________________________________________________

If such number of Rights shall not be all the Rights 
evidenced by this Right Certificate, a new Right Certificate 
for the balance remaining of such Rights shall be registered 
in the name of and delivered to: 

Please insert social security
or other identifying number 

____________________________________________________________
        (Please print name and address)
____________________________________________________________

Dated:  ___________________


                                                ______________________________
                                                Signature

Signature Guaranteed: 

                Signatures must be guaranteed by a member firm of a 
registered national securities exchange, a member of the 
National Association of Securities Dealers, Inc., or a 
commercial bank or trust company having an office or 
correspondent in the United States.

                                -B-5-

<PAGE>


           Form of Reverse Side of Right Certificate -- continued

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

                The undersigned hereby certifies that the Rights 
evidenced by this Right Certificate are not beneficially 
owned by an Acquiring Person or an Affiliate or Associate 
thereof (a defined in the Rights Agreement).


                                                ______________________________
                                                Signature

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


        NOTICE

                The signature in the Form of Assignment or Form of 
Election to Purchase, as the case may be, must conform to 
the name as written upon the face of this Right Certificate 
in every particular, without alteration or enlargement or 
any change whatsoever.

                In the event the certification set forth above in the 
Form of Assignment or the Form of Election to Purchase, as 
the case may be, is not completed, the Company and the 
Rights Agent will deem the beneficial owner of the Rights 
evidenced by this Right Certificate to be an Acquiring 
Person or an Affiliate or Associate thereof (as defined in 
the Rights Agreement) and such Assignment or Election to 
Purchase will not be honored. 

                                -B-6-

<PAGE>


                                                                     Exhibit C

                        SUMMARY OF RIGHTS TO PURCHASE
                              PREFERRED SHARES


                On January 23, 1998, the Board of Directors of 
Immunomedics, Inc. (the "Company") declared a dividend of one 
preferred share purchase right (a "Right") for each outstanding 
share of common stock, par value $.01 per share (the "Common 
Shares"), of the Company. The dividend is payable on February 2, 
1998 (the "Record Date") to the stockholders of record on that 
date.  Each Right entitles the registered holder to purchase from 
the Company one one-hundredth of a share of Series E Junior 
Participating Preferred Stock, par value $.01 per share (the 
"Preferred Shares"), of the Company at a price of $37 per one 
one-hundredth of a Preferred Share (the "Purchase Price"), 
subject to adjustment. The description and terms of the Rights 
are set forth in a Rights Agreement (the "Rights Agreement") 
between the Company and American Stock Transfer and Trust 
Company, as Rights Agent (the "Rights Agent").

                Until the earlier to occur of (i) 10 days following a 
public announcement that a person or group of affiliated or 
associated persons (an "Acquiring Person") have acquired 
beneficial ownership of 15% or more of the outstanding Common 
Shares or (ii) 10 business days (or such later date as may be 
determined by action of the Board of Directors prior to such time 
as any person or group of affiliated persons becomes an Acquiring 
Person) following the commencement of, or announcement of an 
intention to make, a tender offer or exchange offer the 
consummation of which would result in the beneficial ownership by 
a person or group of 15% or more of the outstanding Common Shares 
(the earlier of such dates being called the "Distribution Date"), 
the Rights will be evidenced, with respect to any of the Common 
Share certificates outstanding as of the Record Date, by such 
Common Share certificate with a copy of this Summary of Rights 
attached thereto.

                The Rights Agreement provides that, until the 
Distribution Date (or earlier redemption or expiration of the 
Rights), the Rights will be transferred with and only with the 
Common Shares. Until the Distribution Date (or earlier redemption 
or expiration of the Rights), new Common Share certificates 
issued after the Record Date upon transfer or new issuance of 
Common Shares will contain a notation incorporating the Rights 
Agreement by reference. Until the Distribution Date (or earlier 
redemption or expiration of the Rights), the surrender for 
transfer of any certificates for Common Shares outstanding as of

                                -C-1-
                                
<PAGE>
 
the Record Date, even without such notation or a copy of this 
Summary of Rights being attached thereto, will also constitute 
the transfer of the Rights associated with the Common Shares 
represented by such certificate. As soon as practicable following 
the Distribution Date, separate certificates evidencing the 
Rights ("Right Certificates") will be mailed to holders of record 
of the Common Shares as of the close of business on the 
Distribution Date and such separate Right Certificates alone will 
evidence the Rights. 

                The Rights are not exercisable until the Distribution 
Date. The Rights will expire on January 23, 2008 (the "Final 
Expiration Date"), unless the Final Expiration Date is extended 
or unless the Rights are earlier redeemed or exchanged by the 
Company, in each case, as described below.

                The Purchase Price payable, and the number of Preferred 
Shares or other securities or property issuable, upon exercise of 
the Rights are subject to adjustment from time to time to prevent 
dilution (i) in the event of a stock dividend on, or a 
subdivision, combination or reclassification of, the Preferred 
Shares, (ii) upon the grant to holders of the Preferred Shares of 
certain rights or warrants to subscribe for or purchase Preferred 
Shares at a price, or securities convertible into Preferred 
Shares with a conversion price, less than the then-current market 
price of the Preferred Shares or (iii) upon the distribution to 
holders of the Preferred Shares of evidences of indebtedness or 
assets (excluding regular periodic cash dividends paid out of 
earnings or retained earnings or dividends payable in Preferred 
Shares) or of subscription rights or warrants (other than those 
referred to above). 

                The number of outstanding Rights and the number of one 
one-hundredths of a Preferred Share issuable upon exercise of 
each Right are also subject to adjustment in the event of a stock 
split of the Common Shares or a stock dividend on the Common 
Shares payable in Common Shares or subdivisions, consolidations 
or combinations of the Common Shares occurring, in any such case, 
prior to the Distribution Date.

                Preferred Shares purchasable upon exercise of the 
Rights will not be redeemable. Each Preferred Share will be 
entitled to a minimum preferential quarterly dividend payment of 
$1 per share but will be entitled to an aggregate dividend of 100 
times the dividend declared per Common Share. In the event of 
liquidation, the holders of the Preferred Shares will be entitled 
to a minimum preferential liquidation payment of $100 per share 
but will be entitled to an aggregate payment of 100 times the

                                -C-2-
                                
<PAGE>
 
payment made per Common Share. Each Preferred Share will have 100 
votes, voting together with the Common Shares. Finally, in the 
event of any merger, consolidation or other transaction in which 
Common Shares are exchanged, each Preferred Share will be 
entitled to receive 100 times the amount received per Common 
Share. These rights are protected by customary antidilution 
provisions. 

                Because of the nature of the Preferred Shares' 
dividend, liquidation and voting rights, the value of the one 
one-hundredth interest in a Preferred Share purchasable upon 
exercise of each Right should approximate the value of one Common 
Share. 

                In the event that the Company is acquired in a merger 
or other business combination transaction or 50% or more of its 
consolidated assets or earning power are sold after a person or 
group has become an Acquiring Person, proper provision will be 
made so that each holder of a Right will thereafter have the 
right to receive, upon the exercise thereof at the then current 
exercise price of the Right, that number of shares of common 
stock of the acquiring company which at the time of such 
transaction will have a market value of two times the exercise 
price of the Right. In the event that any person or group of 
affiliated or associated persons becomes an Acquiring Person, 
proper provision shall be made so that each holder of a Right, 
other than Rights beneficially owned by the Acquiring Person 
(which will thereafter be void), will thereafter have the right 
to receive upon exercise that number of Common Shares having a 
market value of two times the exercise price of the Right. 

                At any time after any person or group becomes an 
Acquiring Person and prior to the acquisition by such person or 
group of 50% or more of the outstanding Common Shares, the Board 
of Directors of the Company may exchange the Rights (other than 
Rights owned by such person or group which will have become 
void), in whole or in part, at an exchange ratio of one Common 
Share, or one one-hundredth of a Preferred Share (or of a share 
of a class or series of the Company's preferred stock having 
equivalent rights, preferences and privileges), per Right 
(subject to adjustment). 

                With certain exceptions, no adjustment in the Purchase 
Price will be required until cumulative adjustments require an 
adjustment of at least 1% in such Purchase Price.  No fractional 
Preferred Shares will be issued (other than fractions which are 
integral multiples of one one-hundredth of a Preferred Share, 
which may, at the election of the Company, be evidenced by

                                -C-3-
                                
<PAGE>
 
depositary receipts) and in lieu thereof, an adjustment in cash 
will be made based on the market price of the Preferred Shares on 
the last trading day prior to the date of exercise. 

                At any time prior to the acquisition by a person or 
group of affiliated or associated persons of beneficial ownership 
of 15% or more of the outstanding Common Shares, the Board of 
Directors of the Company may redeem the Rights in whole, but not 
in part, at a price of $.001 per Right (the "Redemption Price"). 
The redemption of the Rights may be made effective at such time 
on such basis with such conditions as the Board of Directors in 
its sole discretion may establish. Immediately upon any 
redemption of the Rights, the right to exercise the Rights will 
terminate and the only right of the holders of Rights will be to 
receive the Redemption Price. 

                The terms of the Rights may be amended by the Board of 
Directors of the Company without the consent of the holders of 
the Rights, including an amendment to lower certain thresholds 
described above to not less than the greater of (i) the sum of 
 .001% and the largest percentage of the outstanding Common Shares 
then known to the Company to be beneficially owned by any person 
or group of affiliated or associated persons and (ii) 10%, except 
that from and after such time as any person or group of 
affiliated or associated persons becomes an Acquiring Person no 
such amendment may adversely affect the interests of the holders 
of the Rights. 

                Until a Right is exercised, the holder thereof, as 
such, will have no rights as a stockholder of the Company, 
including, without limitation, the right to vote or to receive 
dividends. 

                A copy of the Rights Agreement has been filed with the 
Securities and Exchange Commission as an Exhibit to a 
Registration Statement on Form 8-A dated January 27, 1998.  A 
copy of the Rights Agreement is available free of charge from the 
Company. This summary description of the Rights does not purport 
to be complete and is qualified in its entirety by reference to 
the Rights Agreement, which is hereby incorporated herein by 
reference.

                                -C-4-

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