SOMATOGEN INC
8-K, 1997-06-10
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>  1
SOMATOGEN, INC.

                SECURITIES AND EXCHANGE COMMISSION

                      Washington, D.C. 20549

                            Form 8-K

                        CURRENT REPORT

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


          Date of Report (Date of earliest event reported): 
                           June 5, 1997

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


                             Delaware
                    (State of Incorporation)

       0-19423                                   84-0991858
 Commission File Number                 IRS Employer Identification No.)


                      2545 Central Ave., Boulder, CO 80301
               (Address of principal executive offices and Zip Code)


                                (303) 440-9988
           Registrant's telephone number, including area code:








Somatogen and the Somatogen logo are tradenames of 
Somatogen, Inc. Optro(TM) is a trademark of Somatogen, Inc.
All other brand names or trademarks appearing in this 8-K 
are the property of their respective holders.













<PAGE>  2
SOMATOGEN, INC.



Item 5.  Other Events.

     On June 2, 1997 the Board of Directors of Somatogen, 
Inc. (the "Company") declared a dividend of one preferred 
share purchase right (a "Right") for each outstanding 
share of common stock, par value $.001 per share (the 
"Common Shares"), of the Company.  The dividend is payable 
on June 12, 1997 (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 A Junior Participating Preferred Stock, par
value $.001 per share (the "Preferred Stock"), at a price 
of $44.00 per one one-hundredth of a Preferred Share (the 
"Purchase Price"), subject to adjustment.  Each one one-
hundredth of a share of Preferred Stock has designations 
and the powers, preferences and rights, and the qualifica-
tions, limitations and restrictions which make its value 
approximately equal to the value of a Common Share.  The 
description and terms of the Rights are set forth in a 
Rights Agreement dated as of June 5, 1997 (the "Rights 
Agreement"), between the Company and ChaseMellon Share-
holder Services, L.L.C. as Rights Agent (the "Rights 
Agent").

     Initially, the Rights will be evidenced by the stock 
certificates representing the Common Shares then out-
standing, and no separate Right Certificates, as defined, 
will be distributed.  Until the earlier to occur of (i) the
date of a public announcement that a person, entity 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 entity 
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 such 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 or without a copy of the 
Summary of Rights, which is included in the Rights Agree-
ment as Exhibit C thereof (the "Summary of Rights"), 
attached thereto.

     The Rights Agreement provides that, until the 
Distribution Date, 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 


<PAGE>  3
SOMATOGEN, INC.


contain a notation incorporating the Rights Agreement by 
reference.  Until the Distribution Date (or earlier 
redemption or expiration of the Rights), the surrender or 
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.  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  June 5, 2007 (the "Final 
Expiration Date"), unless the Final Expiration Date is 
extended or unless the Rights are earlier redeemed 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 exercise of Rights for Preferred Shares is 
at all times subject to the availability of a sufficient 
number of authorized but unissued Preferred Shares.  

     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, consolidation or combinations of the Common 
Shares occurring, in any 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 $1.00 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 

<PAGE>  4
SOMATOGEN, INC.


Preferred Shares will be entitled to a minimum prefer-
ential liquidation payment of $100 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 trans-
action in which Common Shares are exchanged, each 
Preferred Share will be entitled to receive 100 times 
the amount of consideration received per Common Share

These rights are protected by customary anti-dilution 
provisions.  Because of the nature of the Preferred 
Shares' dividend and liquidation rights, the value of 
one one-hundredth of a Preferred Share should approximate 
the value of one Common Share.

     In the event that any person 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 for 
a 60-day period 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 (or, if such number 
of shares is not and cannot be authorized, the Company may 
issue Preferred Stock, cash, debt, stock or a combination 
thereof in exchange for the Rights).  This right will 
terminate 60 days after the date on which the Rights become
nonredeemable (as described below), unless there is an 
injunction or similar obstacle to exercise of the Rights, 
in which event this right will terminate 60 days after the 
date on which the Rights again become exercisable.

     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, 
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 trans-
action will have a market value of two times the 
exercise price of the Right.  

     At any time after the acquisition by a person or 
group of affiliated or associated persons of beneficial 
ownership of 15% or more of the outstanding Common Shares 
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 have 
become void), in whole or in part, at an exchange ratio 
of one Common Share, or one one-hundredth of a Preferred 
Share, per Right (or, if the number of shares is not and 
cannot be authorized, the Company may issue cash, debt, 
stock or a combination thereof in exchange for the Rights),
subject to adjustment.
<PAGE>  5
SOMATOGEN, INC.


     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 the number of 
one one-hundredth of a Preferred Share issuable upon the 
exercise of one Right, which may, at the option 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.

     At any time prior to the earlier of (i) the day of 
the first public announcement that a person has become an 
Acquiring Person or (ii) the Final Expiration Date, the 
Board of Directors of the Company may redeem the Rights 
in whole, but not in part, at a price of $.01 per Right 
(the "Redemption Price").  Following the expiration of 
the above periods, the Rights become nonredeemable. Under 
certain circumstances, the Board of Director's right to 
redeem the Rights may be suspended for 180 days. Immediate-
ly 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, except that from and after such 
time as the rights are distributed no such amendments may 
adversely affect the interest of the holders of the Rights
excluding the interests of an Acquiring Person. Under 
certain circumstances, the Board of Directors' right to 
amend the Rights Plan may be suspended for 180 days.

     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.

     The Rights have certain anti-takeover effects.  The
Rights will cause substantial dilution to a person or 
group that attempts to acquire the Company on terms not 
approved by the Company's Board of Directors.  The Rights 
should not interfere with any merger or other business 
combination approved by the Board of Directors since the 
Rights may be redeemed by the Company at $.01 per Right 
prior to the earliest of (i) the day that a person or 
group has acquired beneficial ownership of 15% or more 
of the Common Shares or (ii) the final expiration date 
of the rights.






<PAGE>  6
SOMATOGEN, INC.


Item 7.  Exhibits.

         99.5   Press Release, dated as of June 4, 1997
entitled "Somatogen, Inc. Adopts Preferred Share Purchase 
Rights Plan."

         99.6   Rights Agreement, dated as of June 5, 
1997, between Somatogen, Inc. and ChaseMellon Shareholder 
Services, L.L.C., with exhibits.



                        SIGNATURE

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


Dated: June 10, 1997

                                  SOMATOGEN, INC.

                                  By:  Andre de Bruin
                                  Its: Chairman, President 
                                       and CEO




<PAGE>  1 



NEWS RELEASE                   For more information contact:
NEWS RELEASE
NEWS RELEASE                   Nanita Waddell - Corporate IR
                               Somatogen, Inc.
                               303.541.3311

FOR IMMEDIATE RELEASE

SOMATOGEN, INC. ADOPTS PREFERRED SHARE PURCHASE RIGHTS PLAN

(BOULDER, CO., June 4, 1997):  The Board of Directors of 
Somatogen, Inc. (Nasdaq:SMTG) approved the adoption of a 
Preferred Share Purchase Rights Plan under which stock-
holders will receive one Right to purchase one one-hundredth
of a share of a new series of Preferred Stock for each 
outstanding share of Somatogen Common Stock held of record 
at the close of business on June 12, 1997 (the "Record 
Date").

The Rights Plan is designed to enable all Somatogen 
stockholders to realize the full value of their investment 
and to provide for fair and equal treatment for all stock-
holders in the event that an unsolicited attempt is made to
acquire Somatogen.  The adoption of the Rights Plan is 
intended as a means to guard against abusive takeover 
tactics and was not adopted in response to any specific 
overtures towards Somatogen.

The Rights will be distributed as a non-taxable dividend 
and will expire on June 5, 2007.  The Rights will be 
exercisable only if a person or group acquires 15% or more 
of the Somatogen Common Stock or announces a tender offer 
for 15% or more of the Common Stock.  If a person acquires 
15% or more of Somatogen's Common Stock, all Rightsholders 
except the buyer will be entitled to acquire Somatogen 
Common Stock at a discount.  The effect will be to 
discourage acquisitions of more than 15% of Somatogen's 
Common Stock without negotiations with the Board of 
Directors.

The Rights will trade with Somatogen's Common Stock, unless
and until they are separated upon occurrence of certain 
future events.  Somatogen's Board of Directors may 
terminate the Rights Plan at any time or redeem the Rights 
prior to the time a person acquires more than 15% of the 
Somatogen Common Stock.  Additional details regarding the 
Rights Plan will be outlined in a summary mailed to all 
record holders following the Record Date.





<PAGE>  2


Somatogen is a biopharmaceutical company engaged in the 
research, clinical development and commercialization of 
genetically engineered recombinant human hemoglobin-based products.

For additional information on Somatogen via facsimile at 
no cost, dial 800.669.9307, or see our Web site at 
http://members.aol.com/somatogen/index.htm.


<PAGE>  1




                          SOMATOGEN, INC.
                                AND
           CHASEMELLON SHAREHOLDER SERVICES, L.L.C.
                        AS RIGHTS AGENT
                        RIGHTS AGREEMENT
                   DATED AS OF JUNE 5, 1997

                        RIGHTS AGREEMENT

     This Rights Agreement ("Agreement"), dated as of 
June 5, 1997, between Somatogen, Inc., a Delaware corpora-
tion (the "Company"), and ChaseMellon Shareholder 
Services, L.L.C. ("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 such term 
is hereinafter defined) outstanding at the close of busi-
ness on June 12, 1997 (the "Record Date"), each Right 
representing the right to purchase one one-hundredth of 
a Preferred Share (as such term is 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 to occur of the Distribution Date, the 
Redemption Date and the Final Expiration Date (as such 
terms are hereinafter defined); provided, however, that 
Rights may be issued with respect to Common Shares that 
shall become outstanding after the Distribution Date and 
prior to the earlier of the Redemption Date and the Final 
Expiration Date in accordance with the provisions of 
Section 22 hereof. 

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

     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 here-
inafter defined) of such Person, shall be the Beneficial 
Owner (as such term is hereinafter defined) of 15% or more 
of the Common Shares then outstanding.  Notwithstanding 
the foregoing, (A) the term Acquiring Person shall not 
include (i) the Company, (ii) any Subsidiary (as such term 
<PAGE>  2


is hereinafter defined) of the Company, (iii) any employee 
benefit or compensation plan of the Company or any 
Subsidiary of the Company, or (iv) any entity holding 
Common Shares for or pursuant to the terms of any such 
employee benefit or compensation plan, and (B) no Person 
shall become an "Acquiring Person" either (x) 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 
then outstanding; provided, however, that if a Person shall
become the Beneficial Owner of 15% or more of the Common 
Shares then outstanding by reason of share purchases by 
the Company and shall, following written notice from, or 
public disclosure by the Company of such share purchases 
by the Company, become the Beneficial Owner of any 
additional Common Shares without the prior consent of the 
Company and shall then Beneficially Own more than 15% of 
the Common Shares then outstanding, then such Person shall 
be deemed to be an "Acquiring Person," or (y) if the 
Board of Directors 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 (as determined in good faith by 
the Board of Directors), but in any event within five 
Business Days, following receipt of written notice from 
the Company of such event, of 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; provided, 
however, that the limited partners of a limited partnership
shall not be deemed to be Associates of such limited 
partnership solely by virtue of their limited partnership 
interest.

     (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 
Affiliates or Associates is deemed to beneficially own, 
within the meaning of Rule 13d-3 of the General Rules and 
Regulations under the Exchange Act as in effect on the 
date of this Rights Agreement;




<PAGE>  3


     (ii)     which such Person or any of such Person's 
Affiliates 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 and other than agreements between the 
Company and any corporate partner pursuant to which the 
right to purchase shares is conditioned upon the achieve-
ment of research or development milestones), or upon the 
exercise of conversion rights, exchange rights, rights 
(other than these Rights), warrants or options, or other-
wise; 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 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) hereof) 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 out-
standing 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 institu-
tions in the State of New York are authorized or obligated 
by law or executive order to close.


<PAGE>  4


     (e)     "Close of Business" on any given date shall 
mean 5:00 p.m., Mountain Time, on such date; provided, 
however, that if such date is not a Business Day it shall 
mean 5:00 p.m., Mountain Time, on the next succeeding 
Business Day.

     (f)     "Common Shares" shall mean the shares of 
common stock, par value $.001 per share, of the Company; 
provided, however, that, "Common Shares," when used in 
this Agreement in connection with a specific 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 Sub-
sidiary of another Person, the Person or Persons which 
ultimately control such first-mentioned Person.

     (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)     "Interested Stockholder" shall mean any 
Acquiring Person or any Affiliate or Associate of an 
Acquiring Person or any other Person in which any such 
Acquiring Person, Affiliate or Associate has an interest, 
or any other Person acting directly or indirectly on 
behalf of or in concert with any such Acquiring Person, 
Affiliate or Associate. 

     (j)     "Person" shall mean any individual, firm, 
corporation or other entity, and shall include any succes-
sor (by merger or otherwise) of such entity.

     (k)     "Preferred Shares" shall mean shares of 
Series A Junior Participating Preferred Stock, par value 
$.001 per share, of the Company having the designations 
and the powers, preferences and rights, and the qualifica-
tions, limitations and restrictions set forth in the Form 
of Certificate of Designation attached to this Agreement 
as Exhibit A.

     (l)     "Purchase Price" shall have the meaning set 
forth in Section 7(b) hereof.

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

     (n)     "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 provided, 
however that, if such Person is determined not to have 
become an Acquiring Person pursuant to clause (y) of Sub-
section 1(a) hereof, then no Shares Acquisition Date shall
be deemed to have occurred.


<PAGE>  5


     (o)     "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.

     (p)     "Transaction" shall mean any merger, consoli-
dation or sale of assets described in Section 13(a) hereof 
or any acquisition of Common Shares which would result in 
a Person becoming an Acquiring Person or a Principal Party 
(as such term is hereinafter defined).

     (q)     "Transaction Person" with respect to a 
Transaction shall mean (i) any Person who (x) is or will 
become an Acquiring Person or a Principal Party (as such 
term is hereinafter defined) if the Transaction were to 
be consummated and (y) directly or indirectly proposed or 
nominated a director of the Company which director is in 
office at the time of consideration of the Transaction, 
or (ii) an Affiliate or Associate of such a Person.

     2.     Appointment of Rights Agent  

     The Company hereby appoints the Rights Agent to act 
as agent for the Company 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.

     3.     Issue of Right Certificates.

     (a)     Until the earlier of (i) the Shares Acquisi-
tion 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 
(determined in accordance with Rule 14d-2 under the 
Exchange Act) 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) 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) to commence, a tender or exchange offer 
(which intention to commence remains in effect for five 
Business Days after such announcement), the consummation 
of which would result in any Person becoming an Acquiring 
Person (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 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 Rights (and the right to receive 
<PAGE>  6


Right Certificates therefor) 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 Distri-
bution Date, at the address of such holder shown on the 
records of the Company, a Right Certificate, in substan-
tially the form of Exhibit B hereto (a "Right 
Certificate"), evidencing one Right for each Common 
Share so held, subject to the adjustment provisions of 
Section 11 of this Rights Agreement.  As of the Distri-
bution 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 (directly or through the 
Rights Agent or its transfer agent) 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 for Common 
Shares outstanding as of the Record Date, until the Distri-
bution Date, the Rights will be evidenced by such 
certificates registered in the names of the holders 
thereof.  Until the Distribution Date (or the earlier of 
the Redemption Date and the Final Expiration Date), the 
surrender for transfer of any certificate for Common 
Shares outstanding on the Record Date shall also consti-
tute 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 Somatogen, Inc. (the "Company") and 
ChaseMellon Shareholder Services, L.L.C. as Rights Agent 
(the "Rights Agent"), dated as of June 5, 1997, as amended
from time to time (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 the Company.  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.  The Company will mail to the holder of 
<PAGE>  7



this certificate a copy of the Rights Agreement without 
charge after receipt of a written request therefor.  As 
described in the Rights Agreement, Rights issued to any 
Person who becomes an Acquiring Person or an Affiliate 
or Associate thereof (as defined in the Rights Agreement) 
and certain related persons, whether currently held by or 
on behalf of such Person or by any subsequent holder, shall
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 canceled and retired so that the Company shall not 
be entitled to exercise any Rights associated with the 
Common Shares which are no longer outstanding.  Notwith-
standing this Section 3(c), the omission of a legend shall 
not affect the enforceability of any part of this Rights 
Agreement or the rights of any holder of the Rights.

     4.    Form of Right Certificates

     (a)     The Right Certificates (and the form of 
election to purchase Preferred Shares, the form of assign-
ment and the form of certification to be printed on the 
reverse thereof) shall be substantially the same as 
Exhibit B 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 Sections 7,11 and 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.

     (b)     Any Right Certificate issued pursuant to 
Section 3(a) or Section 22 hereof that represents Rights 
which are null and void pursuant to Section 11(a)(ii) 
hereof and any Right Certificate issued pursuant to 
Section 6 or Section 11 hereof upon transfer, exchange, 
replacement or adjustment of any other Right Certificate 

<PAGE>  8

referred to in this sentence, shall contain (to the extent 
feasible) the following legend:

     The Rights represented by this Right Certificate are 
or were beneficially owned by a Person who was or became an
Acquiring Person or an Affiliate or Associate of an 
Acquiring Person (as such terms are defined in the Rights 
Agreement). Accordingly, this Right Certificate and the 
Rights represented hereby are null and void.

     The provisions of Section 11(a)(ii) hereof shall be 
operative whether or not the foregoing legend is contained 
on any such Right Certificate.

     5.     Countersignature and Registration

     The Right Certificates shall be executed on behalf of 
the Company by its Chairman of the Board, its Chief Execu-
tive Officer, its President, its Vice Chairman of the 
Board, its Chief Financial Officer, or any of its Vice 
Presidents, 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 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 office designated for such
purpose, 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.

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




<PAGE>  9


     Subject to the provisions of Section 11(a)(ii), 
Section 14 and Section 24 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 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 office of the Rights Agent designated 
for such purpose.  Neither the Rights Agent nor the Company
shall be obligated to take any action whatsoever with 
respect to the transfer of any such surrendered Right 
Certificate until the registered holder shall have com-
pleted and signed the certificate contained in the form of 
assignment on the reverse side of such Right Certificate 
and shall have provided such additional evidence of the 
identity of the Beneficial Owner (or former Beneficial 
Owner) or Affiliates or Associates thereof as the Company 
shall reasonably request.  Thereupon the Rights Agent 
shall, subject to Section 11(a)(ii), Section 14 and 
Section 24 hereof, 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 issue,
execute and deliver a new Right Certificate of like tenor 
to the Rights Agent for countersignature and delivery to 
the registered holder in lieu of the Right Certificate so 
lost, stolen, destroyed or mutilated.

     Notwithstanding any other provisions hereof, the 
Company and the Rights Agent may amend this Rights Agree-
ment to provide for uncertificated Rights in addition to 
or in place of Rights evidenced by Rights Certificates.

     7.     Exercise of Rights; Purchase Price; Expiration
            Date of Rights
<PAGE>  10


     (a)     The registered holder of any Right Certificate
may exercise the Rights evidenced thereby (except as 
otherwise provided herein) in whole or 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 office of the Rights Agent designated for such purpose,
together with payment of the Purchase Price for each one 
one-hundredth of a Preferred Share (or such other number 
of shares or other securities) as to which the Rights are 
exercised, at or prior to the earliest of (i) the Close of 
Business on June 5, 2007 (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 (the "Purchase Price") for 
each one one-hundredth of a Preferred Share pursuant to the 
exercise of a Right shall initially be $44.00 shall be 
subject to adjustment from time to time as provided in 
Sections 11 and 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 repre-
senting 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, bank 
draft or money order payable to the order of the Company, 
the Rights Agent shall thereupon promptly (i) (A) requi-
sition from any transfer agent for 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) if the Company, in its sole discretion, shall have 
elected to deposit the Preferred Shares issuable upon 
exercise of the Rights hereunder into a depositary, 
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, (ii) 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 

<PAGE>  11


the order of the registered holder of such Right Certifi-
cate.  In the event that the Company is obligated to issue 
securities of the Company other than Preferred Shares 
(including Common Shares) of the Company pursuant to 
Section 11(a) hereof, the Company will make all arrange-
ments necessary so that such other securities are 
available for distribution by the Rights Agent, if and 
when appropriate.

     In addition, in the case of an exercise of the Rights 
by a holder pursuant to Section 11(a)(ii) hereof, the 
Rights Agent shall return such Right Certificate to the 
registered holder thereof after imprinting, stamping or 
otherwise indicating thereon that the rights represented 
by such Right Certificate no longer include the rights 
provided by Section 11(a)(ii) hereof, and, if fewer than 
all the Rights represented by such Right Certificate were 
so exercised, the Rights Agent shall indicate on the Right
Certificate the number of Rights represented thereby 
which continue to include the rights provided by 
Section 11(a)(ii) hereof.

     (d)     In case the registered holder of any Right 
Certificate shall exercise fewer 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.

     (e)     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 this Section 7.

     (f)     Notwithstanding anything in this Agreement to 
the contrary, neither the Rights Agent nor the Company 
shall be obligated to undertake any action with respect to 
a registered holder upon the occurrence of any purported 
exercise as set forth in this Section 7 unless such 
registered holder shall have (i) completed and signed the 
certification following the form of election to purchase 
set forth on the reverse side of the Rights Certificate 
surrendered for such exercise and (ii) provided such 
additional evidence of the identity of the Beneficial Owner
(or former Beneficial Owner) or Affiliates or Associates 
thereof as the Company shall reasonably request.

     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 
<PAGE>  12


or in canceled form, or, if delivered or surrendered to 
the Rights Agent, shall be canceled by it, and no Right 
Certificates shall be issued in lieu thereof except as 
expressly permitted by any of the provisions of this 
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 
canceled Right Certificates to the Company, or shall, at 
the written request of the Company, destroy such canceled 
Right Certificates, and in such case shall deliver a 
certificate of destruction thereof to the Company.

     9.     Availability of Preferred Shares

     The Company covenants and agrees that so long as the 
Preferred Shares (and, after the time a person becomes an 
Acquiring Person, Common Shares or any other securities) 
issuable upon the exercise of the Rights may be listed on 
any national securities exchange or quotation system, the 
Company shall use its best efforts to cause, from and after
such time as the Rights become exercisable, all shares 
reserved for such issuance to be listed on such exchange 
or quotation system upon official notice of issuance upon 
such exercise.

     The Company covenants and agrees that it will take 
all such action as may be necessary to ensure that all 
Preferred Shares (or Common Shares and other securities, 
as the case may be) 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 or other securities.

     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, 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.



<PAGE>  13


     As soon as practicable after the Shares Acquisition 
Date, the Company shall use its best efforts to: 

     (i)     prepare and file a registration statement 
under the Securities Act of 1933, as amended (the "Act"),
with respect to the Rights and the securities purchasable 
upon exercise of the Rights on an appropriate form, will 
use its best efforts to cause such registration statement 
to become effective as soon as practicable after such 
filing and will use its best efforts to cause such 
registration statement to remain effective (with a 
prospectus at all times meeting the requirements of 
the Act) until the Final Expiration Date; and

     (ii)     use its best efforts to qualify or register 
the Rights and the securities purchasable upon exercise 
of the Rights under the blue sky laws of such jurisdic-
tions as may be necessary or appropriate.

     10.     Preferred Shares Record Date

     Each person in whose name any certificate for 
Preferred Shares or other securities is issued upon the 
exercise of Rights shall for all purposes be deemed to 
have become the holder of record of the Preferred Shares 
or other securities represented thereby on, and such 
certificate shall be dated, the date upon which the Right 
Certificate evidencing such Rights was duly surrendered 
with the forms of election and certification duly executed 
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 or other securities 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 or other securities 
transfer books of the Company are open.  Prior to the 
exercise of the Rights evidenced thereby, the holder of a 
Right Certificate, as such, 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 distribu-
tions 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.

     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.



<PAGE>  14


     (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) 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 proportion-
ately 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, such holder 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 considera-
tion 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.  
If an event occurs which would require an adjustment under 
both Section 11(a)(i) and Section 11(a)(ii) hereof, the 
adjustment provided for in this Section 11(a)(i) shall be 
in addition to, and shall be made prior to any adjustment 
required pursuant to Section 11(a)(ii) hereof.

     (ii)     Subject to Section 24 hereof and the pro-
visions of the next paragraph of this Section 11(a)(ii), 
in the event any Person shall become an Acquiring Person, 
each holder of a Right shall, for a period of 60 days after
the later of such time any Person becomes an Acquiring 
Person or the effective date of an appropriate registra-
tion statement under the Act pursuant to Section 9 hereof 
(provided, however that, if at any time prior to the 
expiration or termination of the Rights there shall be a 
temporary restraining order, a preliminary injunction, an 
injunction, or temporary suspension by the Board of 
Directors, or similar obstacle to exercise of the Rights 
(the "Injunction") which prevents exercise of the Rights, 
a new 60-day period shall commence on the date the 
Injunction is removed), 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 Agree-
ment and in lieu of Preferred Shares, such number of 
Common Shares as shall equal the result obtained by 
(A) multiplying the then current Purchase Price by the 
number of one one-hundredths of a Preferred Share for 

<PAGE>  15


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 (determined pursuant to Section 11(d) 
hereof) on the date such Person became an Acquiring Person;
provided, however, that if the transaction that would 
otherwise give rise to the foregoing adjustment is also 
subject to the provisions of Section 13 hereof, then only 
the provisions of Section 13 hereof shall apply and no 
adjustment shall be made pursuant to this Section 11(a)
(ii).  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.

      Notwithstanding anything in this Agreement to the 
contrary, from and after the time any Person becomes an 
Acquiring Person, any Rights beneficially owned by (i) such
Acquiring Person or an Associate or Affiliate of such 
Acquiring Person, (ii) a transferee of such Acquiring 
Person (or of any such Associate or Affiliate) who becomes 
a transferee after the Acquiring Person became such, or 
(iii) a transferee of such Acquiring Person (or of any 
such Associate or Affiliate) who becomes a transferee 
prior to or concurrently with the Acquiring Person's 
becoming such and receives such Rights pursuant to either 
(A) a transfer (whether or not for consideration) from the 
Acquiring Person to holders of equity interests in such 
Acquiring Person or to any Person with whom the Acquiring 
Person has any continuing agreement, arrangement or 
understanding regarding the transferred Rights or (B) a 
transfer which the Board of Directors of the Company has 
determined is part of a plan, arrangement or understanding 
which has as a primary purpose or effect the avoidance of 
this Section 11(a)(ii), shall become null and void without 
any further action and no holder of such Rights shall have 
any rights whatsoever with respect to such Rights, whether 
under any provision of this Agreement or otherwise.  The 
Company shall use all reasonable efforts to insure that 
the provisions of this Section 11(a)(ii) and Section 4(b) 
hereof are complied with, but shall have no liability to 
any holder of Right Certificates or other Person as a 
result of its failure to make any determinations with 
respect to an Acquiring Person or its Affiliates, 
Associates or transferees hereunder.  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 canceled.




<PAGE>  16


     (iii)     In lieu of issuing Common Shares in 
accordance with Section 11(a)(ii) hereof, the Company may, 
if a majority of the Board of Directors then in office 
determines that such action is necessary or appropriate and 
not contrary to the interests of holders of Rights, elect 
to (and, in the event that the Board of Directors has not 
exercised the exchange right contained in Section 24(c) 
hereof and there are not sufficient treasury shares and 
authorized but unissued Common Shares 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, issue or pay,
upon the exercise of the Rights, cash (including by way of 
a reduction of the Purchase Price), property, Common 
Shares, other securities or any combination thereof having 
an aggregate value equal to the value of the Common Shares 
which otherwise would have been issuable pursuant to 
Section 11(a)(ii) hereof, which aggregate value shall be 
determined by a nationally recognized investment banking 
firm selected by a majority of the Board of Directors then 
in office.  For purposes of the preceding sentence, the 
value of the Common Shares shall be determined pursuant to 
Section 11(d) hereof.  Any such election by the Board of 
Directors must be made within 60 days following the date 
on which the event described in Section 11(a)(ii) hereof 
shall have occurred.  Following the occurrence of the 
event described in Section 11(a)(ii) hereof, a majority of 
the Board of Directors then in office may suspend the 
exercisability of the Rights for a period of up to 60 days 
following the date on which the event described in 
Section 11(a)(ii) hereof shall have occurred to the extent 
that such directors have not determined whether to exercise
their rights of election under this Section 11(a)(iii).  
In the event of any such suspension, the Company shall 
issue a public announcement stating that the exercisability
of the Rights has been temporarily suspended.

     (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 designations and the powers, preferences 
and rights, and the qualifications, limitations and 
restrictions 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 such term is hereinafter 
defined) on such record date, 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 number of Preferred Shares outstanding on such
<PAGE>  17


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 determina-
tion 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 (as such term is hereinafter defined) 
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 dis-
tributed or of such 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 
<PAGE>  18


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 not 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 herein-
after 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 or securities convertible
into such shares, or (C) any subdivision, combination or 
reclassification of such Security and prior to the expira-
tion 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 as reported on the Nasdaq National Market or, 
if the Security is not listed or admitted to trading on 
any national securities exchange or reported on the Nasdaq 
National Market, 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 the 
National Association of Securities Dealers, Inc. Automated 
Quotations System ("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 
maker making a market in the Security selected by the 
Board of Directors of the Company or, if on any such date 
no professional market maker is making a market in the 
Security, the price as determined in good faith by the 
Board of Directors.  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 
<PAGE>  19


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) hereof.  If the Preferred 
Shares are not publicly traded, the "current per share 
market price" of the Preferred Shares shall be conclu-
sively deemed to be the current per share market price of 
the Common Shares as determined pursuant to Section 11
(d)(i) hereof (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-
hundredth of a Preferred Share or one ten-thousandth of any
other share or security as the case may be.  Notwith-
standing 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.

     (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 any 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 Sections 11(a) through 
11(c) hereof, inclusive, and the provisions of Sections 7,
9, 10, 13 and 14 hereof with respect to the Preferred 
Shares shall apply on like terms to any such other shares.

     (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 here-

<PAGE>  20

under 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) hereof, upon each
adjustment of the Purchase Price as a result of the
calculations made in Section 11(b) and Section 11(c)
hereof, 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 Preferred 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 
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 
for 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 adjust-
ment.  Right Certificates so to be distributed shall be 

<PAGE>  21


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.

     (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 on the basis of the Purchase 
Price in effect prior to such adjustment; provided, how-
ever, 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)     The Company covenants and agrees that, after 
the Distribution Date, it will not, except as permitted by 
Section 23 or Section 27 hereof, take (or permit any Sub-
sidiary to take) any action the purpose of which is to, or 
if at the time such action is taken it is reasonably 
foreseeable that the effect of such action is to, material-
ly diminish or eliminate the benefits intended to be 
afforded by the Rights.  Any such action taken by the 
Company during any period after any Person becomes an 
Acquiring Person but prior to the Distribution Date shall 
be null and void unless such action could be taken under 
this Section 11(m) from and after the Distribution Date.

     (n)     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 

<PAGE>  22


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.

     (o)     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 sub-
division, 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 out-
standing immediately before such event and the denominator 
of which is the number of Common Shares outstanding 
immediately after such event, 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(o) shall be made successively whenever 
such a dividend is declared or paid or such a subdivision, 
combination or consolidation is effected.

     (p)     The exercise of Rights under Section 11(a)(ii)
hereof shall only result in the loss of rights under 
Section 11(a)(ii) hereof to the extent so exercised and 
shall not otherwise affect the rights represented by the 
Rights under this Agreement, including the rights 
represented by Section 13 hereof.

     12.     Certificate of Adjusted Purchase Price or 
             Number of Shares

     Whenever an adjustment is made as provided in 
Sections 11 and 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 each holder of a Right Certificate in 
accordance with Section 25 hereof.  The Rights Agent shall 
be fully protected in relying on any such certificate and 
on any adjustment therein contained and shall not be 

<PAGE>  23


deemed to have knowledge of any adjustment unless and 
until it shall have received such certificate.

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

     (a)     In the event that, following the Shares 
Acquisition Date or, if a Transaction is proposed, the 
Distribution Date, directly or indirectly (x) the Company 
shall consolidate with, or merge with and into, any 
Interested Stockholder, or if in such merger or consolida-
tion all holders of Common Stock are not treated alike, any
other Person, (y) any Interested Person, or if in such 
merger or consolidation all holders of Common Stock are not
treated alike, any other 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 (other than, in the case of either transaction 
described in (x) or (y), a merger or consolidation which 
would result in all of the voting power represented by the 
securities of the Company outstanding immediately prior 
thereto continuing to represent (either by remaining out-
standing or by being converted into securities of the 
surviving entity) all of the voting power represented by 
the securities of the Company or such surviving entity 
outstanding immediately after such merger or consolidation 
and the holders of such securities not having changed as a 
result of such merger or consolidation), or (z) the Company 
shall sell, mortgage or otherwise transfer (or one or more 
of its subsidiaries shall sell, mortgage or otherwise 
transfer), in one or more transactions, assets or earning 
power aggregating more than 50% of the assets or earning 
power of the Company and its subsidiaries (taken as a 
whole) to any Interested Stockholder or Stockholders, or 
if in such transaction all holders of Common Stock are not 
treated alike, any other Person, (other than the Company or
any Subsidiary of the Company in one or more transactions 
each of which individually and the aggregate does not 
violate Section 13(d) hereof) then, and in each such case, 
proper provision shall be made so that (i) each holder of 
a Right, subject to Section 11(a)(ii) hereof, shall 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 freely tradeable Common Shares of the Principal Party 
(as such term is hereinafter defined), free and clear of 
liens, rights of call or first refusal, encumbrances or 
other adverse claims, as shall be equal to the result 
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 (without taking into 
account any adjustment previously made pursuant to Section 
11(a)(ii) hereof) and dividing that product by (B) 50% of 
the then current per share market price of the Common 

<PAGE>  24


Shares of such Principal Party (determined pursuant to 
Section 11(d) hereof) on the date of consummation of such 
consolidation, merger, sale or transfer; (ii) such 
Principal Party 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 Principal 
Party, it being specifically intended that the provisions 
of Section 11 hereof shall apply to such Principal Party; 
and (iv) such Principal Party shall take such steps 
(including, but not limited to, the reservation of a 
sufficient number of shares 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 its Common 
Shares thereafter deliverable upon the exercise of the 
Rights.

     (b)     "Principal Party" shall mean:

     (i)     in the case of any transaction described in 
clause (x) or (y) of the first sentence of Section 13(a) 
hereof, the Person that is the issuer of any securities 
into which Common Shares are converted in such merger or 
consolidation, and if no securities are so issued, the 
Person that is the other party to the merger or consolida-
tion (or, if applicable, the Company, if it is the 
surviving corporation); and

     (ii)    in the case of any transaction described in 
(z) of the first sentence of Section 13(a) hereof, the 
Person that is the party receiving the greatest portion 
of the assets or earning power transferred pursuant to such
transaction or transactions;

     (1)     if the Common Shares of such Person are not at
such time and have not been continuously over the preceding
12-month period registered under Section 12 of the Exchange
Act, and such Person is a direct or indirect subsidiary or 
Affiliate of another Person the Common Shares of which are 
and have been so registered, "Principal Party" shall refer
to such other Person; (2) if such Person is a subsidiary, 
directly or indirectly, or Affiliate of more than one 
Person, the Common Shares of two or more of which are and 
have been so registered, "Principal Party" shall refer to 
whichever of such Persons is the issuer of the Common 
Shares having the greatest aggregate market value; and 
(3) if such Person is owned, directly or indirectly, by a 
joint venture formed by two or more Persons that are not 
owned, directly or indirectly, by the same Person, the 
rules set forth in (1) and (2) above shall apply to each 
of the chains of ownership having an interest in such joint
venture as if such party were a "subsidiary" of both or 
all of such joint venturers and the Principal Parties in 
each such chain shall bear the obligations set forth in 
<PAGE>  25


this Section 13 in the same ratio as their direct or 
indirect interests in such Person bear to the total of 
such interests.

     (c)     The Company shall not consummate any such 
consolidation, merger, sale or transfer unless the 
Principal Party shall have a sufficient number of 
authorized Common Shares that have not been issued or 
reserved for issuance to permit the exercise in full of 
the Rights in accordance with this Section 13 and unless 
prior thereto the Company and each Principal Party and 
each other Person who may become a Principal Party as a 
result of such consolidation, merger, sale or transfer 
shall have (i) executed and delivered to the Rights Agent 
a supplemental agreement providing for the terms set forth
in paragraphs (a) and (b) of this Section 13 and (ii) 
prepared, filed and had declared and remain effective a 
registration statement under the Act on the appropriate 
form with respect to the Rights and the securities 
exercisable upon exercise of the Rights and further 
providing that, as soon as practicable after the date of 
any consolidation, merger, sale or transfer of assets 
mentioned in paragraph (a) of this Section 13, the 
Principal Party at its own expense will:

     (i)     cause the registration statement under the Act
with respect to the Rights and the securities purchasable 
upon exercise of the Rights on an appropriate form to 
remain effective (with a prospectus at all times meeting 
the requirements of the Act) until the Final Expiration 
Date; 

     (ii)    use its best efforts to qualify or register 
the Rights and the securities purchasable upon exercise of 
the Rights under the blue sky laws of such jurisdictions as
may be necessary or appropriate; 

     (iii)    list the Rights and the securities purchas-
able upon exercise of the Rights on each national 
securities exchange on which the Common Shares were listed 
prior to the consummation of the Business Combination or 
on the Nasdaq National Market if the Common Shares were 
listed on the Nasdaq National Market or, if the Common 
Shares were not listed on a national securities exchange 
or the Nasdaq National Market prior to the consummation of 
the Business Combination, on a national securities exchange
or the Nasdaq National Market; and

     (iv)     deliver to holders of the Rights historical 
financial statements for the Principal Party and each of 
its Affiliates which comply in all material respects with 
the requirements for registration on Form 10 under the 
Exchange Act.

     The provisions of this Section 13 shall similarly 
apply to successive mergers or consolidations or sales or 
other transfers.
<PAGE>  26


    (d)     After the Distribution Date, the Company 
covenants and agrees that it shall not (i) consolidate 
with, (ii) merge with or into, or (iii) sell or transfer 
to, in one or more transactions, assets or earning power 
aggregating more than 50% of the assets or earning power 
of the Company and its subsidiaries taken as a whole, any 
other Person (other than a Subsidiary of the Company in a 
transaction which does not violate Section 11(m) hereof), 
if (x) at the time of or after such consolidation, merger 
or sale there are any charter or bylaw provisions or any 
rights, warrants or other instruments or securities out-
standing, agreements in effect or any other action taken 
which would diminish or otherwise eliminate the benefits 
intended to be afforded by the Rights or (y) prior to, 
simultaneously with or immediately after such consolida-
tion, merger or sale, the stockholders of the Person who 
constitutes, or would constitute, the "Principal Party" 
for purposes of Section 13(a) hereof shall have received a 
distribution of Rights previously owned by such Person or 
any of its Affiliates and Associates.  The Company shall 
not consummate any such consolidation, merger, sale or 
transfer unless prior thereto the Company and such other 
Person shall have executed and delivered to the Rights 
Agent a supplemental agreement evidencing compliance with 
this Section 13(d).

     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 frac-
tional 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 
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 as reported on the Nasdaq National 
Market or, if the Rights are not listed or admitted to 
trading on any national securities exchange or reported 
on the Nasdaq National Market, 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 
<PAGE>  27


by Nasdaq or such other system then in use or, if on any 
such date the Rights are not quoted by any such organiza-
tion, 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; provided, however, 
that holders of such depositary receipts shall have all of 
the designations and the powers, preferences and rights, 
and the qualifications, limitations and restrictions 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 Preferred 
Share.  For the purposes of this Section 14(b), the current
market value of a Preferred Share shall be the current per 
share market price of the Preferred Shares (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 (or, if not publicly traded, in accordance with 
Section 11(d)(ii) hereof).

     (c)     Following the occurrence of one of the trans-
actions or events specified in Section 11 hereof giving 
rise to the right to receive Common Shares, capital stock 
equivalents (other than Preferred Shares) or other securi-
ties upon the exercise of a Right, the Company shall not 
be required to issue fractions of Common Shares or units 
of such Common Shares, capital stock equivalents or other 
securities upon exercise of the Rights or to distribute 
certificates which evidence fractional Common Shares, 
capital stock equivalents or other securities.  In lieu of 
fractional Common Shares, capital stock equivalents or 
other securities, 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 Common 
Share or unit of such Common Shares, capital stock 
equivalents or other securities.  For purposes of this 

<PAGE>  28


Section 14(c), the current market value shall be the 
current per share market price (as determined pursuant to 
Section 11(d)(i) hereof) for the Trading Day immediately 
prior to the date of such exercise and, if such capital 
stock equivalent is not traded, each such capital stock 
equivalent shall have the value of one one-hundredth of a 
Preferred Share.

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

     15.     Rights of Action.

     All rights of action in respect of this Agreement, 
excepting the rights of action given to the Rights Agent 
under Sections 18 and 20 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 Cer-
tificate 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.  Holders of Rights 
shall be entitled to recover the reasonable costs and 
expenses, including attorneys fees, incurred by them in 
any action to enforce the provisions of this Agreement.

     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 (subject to the provisions 
of this Rights Agreement) only on the registry books of 
the Rights Agent if surrendered at the principal office 

<PAGE>  29


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, the associated Common 
Shares certificate) is registered as the absolute owner 
thereof and of the Rights evidenced thereby (notwithstand-
ing 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.


     17.     Right Certificate Holder Not Deemed a Stock-
             holder  

     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 with-
hold 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.

     18.     Concerning the Rights Agent

     The Company agrees to pay to the Rights Agent reason-
able 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 disburse-
ments 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.  
In no case will the Rights Agent be liable for special, 
indirect, incidental or consequential loss or damage of 
any kind whatsoever (including but not limited to lost 
profits), even if the Rights Agent has been advised of 
<PAGE>  30


the possibility of such loss or damage.  The indemnity 
provided herein shall survive the expiration of the Rights 
and the termination of this Agreement.

     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 adminis-
tration of this Agreement in reliance upon any 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.

     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 shareholder services or corporate trust 
business 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 provi-
sions 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 prede-
cessor 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 Certifi-
cates 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 

<PAGE>  31


changed name; and in all such cases such Right Certificates
shall have the full force provided in the Right Certifi-
cates and in this Agreement.

     20.     Duties of Rights Agent.

     The Rights Agent undertakes the duties and obliga-
tions 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 of its choice (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 neces-
sary 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, the Chief Financial Officer, 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.

     (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 exercis-
ability of the Rights (including the Rights becoming void 

<PAGE>  32


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 Sections 3, 11, 13, 23 or 
24 hereof, 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 receipt of a certificate pursuant to 
Section 12 hereof describing such change or adjustment); 
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.

     (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, the
President, the Chief Financial 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.  
Any application by the Rights Agent for written instruc-
tions from the Company may, at the option of the Rights 
Agent, set forth in writing any action proposed to be 
taken or omitted by the Rights Agent with respect to its 
duties or obligations under this Agreement and the date on 
and/or after which such action shall be taken or omitted 
and the Rights Agent shall not be liable for any action 
taken or omitted in accordance with a proposal included 
in any such application on or after the date specified 
therein (which date shall not be less than three business 
days after the date indicated in such application unless 
any such officer shall have consented in writing to an 
earlier date) unless, prior to taking or omitting any 
such action, the Rights Agent has received written 
instructions in response to such application specifying 
the action to be taken or omitted.

     (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 

<PAGE>  33


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.

     (j)     No provision of this Agreement shall require 
the Rights Agent to expend or risk its own funds or other-
wise incur any financial liability in the performance of 
any of its duties hereunder or in the exercise of its 
rights if there shall be reasonable grounds for believing 
that repayment of such funds or adequate indemnification 
against such risk or liability is not reasonably assured 
to it.

     (k)     If, with respect to any Right Certificate
surrendered to the Rights Agent for exercise or transfer,
the certificate attached to the form of assignment or 
form of election to purchase, as the case may be, has not 
been executed, the Rights Agent shall not take any further 
action with respect to such requested exercise of transfer 
without first consulting with the Company.

     21.     Change of Rights Agent. 

     The Rights Agent or any successor Rights Agent may 
resign and be discharged from its duties under this Agree-
ment upon 30 days' notice in writing mailed to the Company 
and to each transfer agent for 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 for 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 or after it 
has 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 
<PAGE>  34


Certificate may apply to any court of competent jurisdic-
tion for the appointment of a new Rights Agent.  Any 
successor Rights Agent, whether appointed by the Company 
or by such a court, shall either be (i) a corporation 
organized and doing business under the laws of the United 
States or of any state of the United States, in good 
standing, authorized under such laws to exercise corporate 
trust or stock transfer powers, and subject to supervision 
or examination by federal or state authority and which has 
at the time of its appointment as Rights Agent a combined 
capital and surplus of at least $50 million or (ii) an 
affiliate of such corporation.  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 to 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 for 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 appoint-
ment of the successor Rights Agent, as the case may be.

     22.     Issuance of New Right Certificates.

     Notwithstanding any of the provisions of this Agree-
ment 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.  In addition, in connection with the 
issuance or sale of Common Shares following the Distribu-
tion Date and prior to the earlier of the Redemption Date 
and the Final Expiration Date, the Company (a) shall with 
respect to Common Shares so issued or sold pursuant to the 
exercise of stock options or under any employee plan or 
arrangement in existence prior to the Distribution Date, or 
upon the exercise, conversion or exchange of securities, 
notes or debentures issued by the Company and in existence 
prior to the Distribution Date, and (b) may, in any other 
case, if deemed necessary or appropriate by the Board of 
Directors of the Company, issue Right Certificates 
representing the appropriate number of Rights in connection 
with such issuance or sale; provided, however, that (i) the
Company shall not be obligated to issue any such Right 
Certificates if, and to the extent that, the Company shall 
be advised by counsel that such issuance would create a 
<PAGE>  35


significant risk of material adverse tax consequences to 
the Company or the Person to whom such Right Certificate 
would be issued, and (ii) no Right Certificate shall be 
issued if, and to the extent that, appropriate adjustment 
shall otherwise have been made in lieu of the issuance thereof.

     23.    Redemption

     (a)     The Rights may be redeemed by action of the
Board of Directors pursuant to Section 23(b) hereof and
shall not be redeemed in any other manner.

     (b)      (i)   The Board of Directors of the Company
may, at its option, at any time prior to the earlier of
such time as any Person becoming an Acquiring Person or
the Final Expiration Date, redeem all but not less than
all of the then outstanding Rights at a redemption price 
of $.01 per Right, appropriately adjusted to reflect any 
stock split, stock dividend or similar transaction occurring
after the date hereof (such redemption price being herein-
after referred to as the "Redemption Price"), and the 
Company may, at its option, pay the Redemption Price in 
Common Shares (based on the "current per share market 
price," as such term is defined in Section 11(d) hereof, 
of the Common Shares at the time of redemption), cash or 
any other form of consideration deemed appropriate by the 
Board of Directors.  The redemption of the Rights by the 
Board of Directors may be made effective at such time, on 
such basis and subject to such conditions as the Board of 
Directors in its sole discretion may establish.  Notwith-
standing anything contained in this Agreement to the 
contrary, the Rights shall not be exercisable pursuant 
to Section 11(a)(ii) hereof prior to the expiration or 
termination of the Company's right of redemption under 
this Section 23(b)(i).

              (ii)  In addition, the Board of Directors of
the Company may, at its option, at any time after the time a
Person becomes an Acquiring Person and the expiration of
any period during which the holder of Rights may exercise
the rights under Section 11(a)(ii) hereof but prior to
any event described in clause (x), (y) or (z) of the first
sentence of Section 13 hereof, redeem all but not less than
all of the then outstanding Rights at the Redemption Price 
(x) in connection with any merger, consolidation or sale 
or other transfer (in one transaction or in a series of 
related transactions) of assets or earning power 
aggregating 50% or more of the assets or earning power 
of the Company and its subsidiaries (taken as a whole) 
in which all holders of Common Shares are treated alike 
and not involving (other than as a holder of Common Shares 
being treated like all other such holders) an Interested 
Stockholder or a Transaction Person or (y)(A) if and for 
so long as the Acquiring Person is not thereafter the 
Beneficial Owner of 15% or more of the then outstanding 
Common Shares, and (B) at the time of redemption no other 
Persons are Acquiring Persons.
<PAGE>  36


              (iii)  Notwithstanding anything to the contrary 
in this Agreement, including, without limitation, the provi-
sions of Section 23(b)(i) and (ii), in the event that a 
majority of the Board of Directors of the Company is 
comprised of (i) persons elected at a meeting of stock-
holders who were not nominated by the Board of Directors 
in office immediately prior to such meeting, and/or 
(ii) persons elected to the Board of Directors for the 
purpose of either facilitating a Transaction with a Trans-
action Person or circumventing directly or indirectly the 
provisions of this Section 23(b)(iii) or the last sentence 
of Section 27, then the Rights may not be redeemed for a 
period of 180 days following the effectiveness of such 
election if such redemption is reasonably likely to have 
the purpose or effect of facilitating a Transaction with 
a Transaction Person.

     (c)     Immediately upon the action of the Board of
Directors of the Company ordering the redemption of the
Rights pursuant to Section 23(b) hereof, 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 pursuant to 
Section 23(b) hereof, 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 Distri-
bution Date, on the registry books of the transfer agent 
for the Common Shares, provided, however, that failure to 
give, or any defect in, any such notice shall not affect 
the validity of such redemption.  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.

     (d)     The Company may, at its option, discharge all
of its obligations with respect to any redemption of the
Rights by (i) issuing a press release announcing the 
manner of redemption of the Rights and (ii) mailing payment
of the Redemption Price to the registered holders of the 
Rights at their last addresses as they appear on the 
registry books of the Rights Agent or, prior to the 
Distribution Date, on the registry books of the transfer 

<PAGE>  37


agent for the Common Shares, and upon such action, all 
outstanding Right Certificates shall be null and void 
without any further action by the Company.

     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").  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), 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 Section 24(a) hereof 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; provided, however, 
that the failure to give, or any defect in, such notice 
shall not affect the validity of such exchange.  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.




<PAGE>  38


     (c)     In lieu of issuing Common Shares in accordance
with Section 24(a) hereof, the Company may, if a majority
of the Board of Directors then in office determines that
such action is necessary or appropriate and not contrary
to the interests of the holders of Rights, elect to (and,
in the event that there are not sufficient treasury shares 
and authorized but unissued Common Shares to permit any 
exchange of the Rights in accordance with Section 24(a) 
hereof, the Company shall) take all such action as may be 
necessary to authorize, issue or pay, upon the exchange 
of the Rights, cash (including by way of a reduction of 
the Purchase Price), property, Common Shares, other 
securities or any combination thereof having an aggregate 
value equal to the value of the Common Shares which 
otherwise would have been issuable pursuant to 
Section 24(a) hereof, which aggregate value shall be 
determined by a nationally recognized investment banking
firm selected by a majority of the Board of Directors 
then in office.  For purposes of the preceding sentence,
the value of the Common Shares shall be determined 
pursuant to Section 11(d) hereof.  Any election pursuant 
to this Section 24(c) by the Board of Directors must be 
made within 60 days following the date on which the event 
described in Section 11(a)(ii) hereof shall have occurred.
Following the occurrence on the event described in 
Section 11(a)(ii) hereof, a majority of the Board of 
Directors then in office may suspend the exercisability 
of the Rights for a period of up to 60 days following the 
date on which the event described in Section 11(a)(ii) 
hereof shall have occurred to the extent that such 
directors have not determined whether to exercise their 
rights of election under this Section 24(c).  In the event 
of any such suspension, the Company shall issue a public 
announcement stating that the exercisability of the 
Rights has been temporarily suspended.

     (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 Section 24(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 after the date of the first public announcement
by the Company that an exchange is to be effected pursuant 
to this Section 24.

     (e)     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 exchange of the Rights or to distribute
certificates which evidence fractional Preferred Shares
<PAGE>  39


(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; provided, however, 
that holders of such depositary receipts shall have all of 
the designations and the powers, preferences and rights, 
and the qualifications, limitations and restrictions 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 
Preferred Share.  For the purposes of this Section 24(e), 
the current market value of a Preferred Share shall be 
one hundred (100) times 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 
after  the date of the first public announcement by the 
Company that an exchange is to be effected pursuant to 
this Section 24.

    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 of a Right Certificate, in 
accordance with Section 26 hereof, a notice of such 
proposed action, which shall specify the record date 
for the purpose of such stock dividend, or distribution 
of rights or warrants, or the date on which such reclassifi-
cation, consolidation, merger, sale, transfer, liquidation,
<PAGE>  40


dissolution, or winding up is to take place and the date 
of participation therein by the holders of the Common 
Shares and/or the 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 the 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
the event and the consequences of the event to holders of Rights
under Section 11(a)(ii) hereof.

     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 Certificate to or on the Company shall be 
sufficiently given or made if sent by first-class mail, 
postage prepaid, addressed (until another address is 
filed in writing with the Rights Agent) as follows:

                        Somatogen, Inc.
                    2545 Central Avenue
                  Boulder, Colorado  80301
               Attn:  Chief Executive Officer

     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:

          ChaseMellon Shareholder Services, L.L.C.
                      50 California Street
                        10th Floor
                 San Francisco, California 94111

     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.



<PAGE>  41


     27.     Supplements and Amendments. 

     Prior to the Distribution Date, the Company and the 
Rights Agent shall, if the Company so directs, supplement 
or amend any provision of this Agreement without the 
approval of any holders of the Rights.  From and after 
the Distribution Date, the Company and the Rights Agent 
shall, if the Company so directs, from time to time supple-
ment or amend any provision of this Agreement without the 
approval of any holders of Right Certificates in order to 
(i) cure any ambiguity, (ii) correct or supplement any 
provision contained herein which may be defective or 
inconsistent with any other provisions herein, or (iii) 
change any other provisions with respect to the Rights 
which the Company may deem necessary or desirable; 
provided, however, that no such supplement or amendment 
shall be made which would adversely affect the interests 
of the holders of Rights (other than the interests of an 
Acquiring Person or its Affiliates or Associates).  Any 
supplement or amendment adopted during any period after 
any Person has become an Acquiring Person but prior to 
the Distribution Date shall become null and void unless 
such supplement or amendment could have been adopted by 
the Company from and after the Distribution Date.  Any 
such supplement or amendment shall be evidenced by a 
writing signed by the Company and the Rights Agent.  
Upon delivery of a certificate from an appropriate officer 
of the Company which states that the proposed supplement 
or amendment is in compliance with the terms of this 
Section 27, the Rights Agent shall execute such supplement 
or amendment unless the Rights Agent shall have determined 
in good faith that such supplement or amendment would 
adversely affect its interest under this Agreement.  Prior 
to the Distribution Date, the interests of the holders of 
Rights shall be deemed coincident with the interests of the
holders of Common Shares. Notwithstanding anything to the 
contrary in this Agreement, in the event that a majority 
of the Board of Directors of the Company is comprised of 
(i) persons elected at a meeting of stockholders who were 
not nominated by the Board of Directors in office 
immediately prior to such meeting, and/or (ii) persons 
elected to the Board of Directors for the purpose of 
either facilitating a Transaction with a Transaction 
Person or circumventing directly or indirectly the pro-
visions of Section 23(b)(iii) or this provision of this 
Section 27, then for a period of 180 days following the 
effectiveness of such election, this Agreement shall not 
be amended or supplemented in any manner reasonably likely 
to have the purpose or effect of facilitating a Transaction
with a Transaction Person.

     28.     Determination and Actions by the Board of 
             Directors, etc  

     For all purposes of this Agreement, any calculation 
of the number of Common Shares outstanding at any 

<PAGE>  42


particular time, including for purposes of determining 
the particular percentage of such outstanding Common Shares
or any other securities of which any Person is the 
Beneficial Owner, shall be made in accordance with the 
last sentence of Rule 13d-3(d)(1)(i) of the General Rules 
and Regulations under the Exchange Act as in effect on the 
date of this Agreement.  The Board of Directors of the 
Company shall have the exclusive power and authority to 
administer this Agreement and to exercise all rights and 
powers specifically granted to the Board, or the Company, 
or as may be necessary or advisable in the administration 
of this Agreement, including without limitation, the right 
and power to (i) interpret the provisions of this Agree-
ment, and (ii) make all determinations deemed necessary or 
advisable for the administration of this Agreement 
(including a determination to redeem or not redeem the 
Rights or to amend the Agreement).  All such actions, 
calculations, interpretations and determinations 
(including, for purposes of clause (y) below, all omis-
sions with respect to the foregoing) which are done or made
by the Board in good faith, shall (x) be final, conclusive 
and binding on the Rights Agent and the holders of the 
Rights, and (y) not subject the Board to any liability 
to the holders of the Rights.

     29.     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.

     30.     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)

     31.     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.



<PAGE>  43


     32.     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 Delaware and 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.

     33.     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 counter-
parts shall together constitute but one and the same 
instrument.

     34.     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.

     In Witness Whereof, parties whereto have caused this 
Agreement to be duly executed, all as of the day and year 
first above written.

                                Somatogen, Inc.


                                By:  Andre de Bruin

                                Its: President and CEO


                                ChaseMellon Shareholder Services,
                                L.L.C.

                                By:  Paul Collins

                                Its: Assistant Vice President 















<PAGE>  44

TABLE OF CONTENTS
                                                         Page No.
Certain Definitions.                                           1
Appointment of Rights Agent.                                   5
Issue of Right Certificates.                                   5
Form of Right Certificates.                                    7
Countersignature and Registration.                             8
Transfer, Split Up, Combination and Exchange of Right 
    Certificates; Mutilated, Destroyed, Lost or 
    Stolen Right Certificates.                                 8
Exercise of Rights; Purchase Price; Expiration Date of Rights. 9
Cancellation and Destruction of Right Certificates.           11
Availability of Preferred Shares.                             12
Preferred Shares Record Date.                                 13
Adjustment of Purchase Price, Number of Shares or Number of  
    Rights.                                                   13
Certificate of Adjusted Purchase Price or Number of Shares.   22
Consolidation, Merger or Sale or Transfer of Assets or 
    Earning Power.                                            23
Fractional Rights and Fractional Shares.                      26
Rights of Action.                                             28
Agreement of Right Holders.                                   28
Right Certificate Holder Not Deemed a Stockholder.            29
Concerning the Rights Agent.                                  29
Merger or Consolidation or Change of Name of Rights Agent.    30
Duties of Rights Agent.                                       31
Change of Rights Agent.                                       33
Issuance of New Right Certificates.                           34
Redemption.                                                   35
Exchange.                                                     37
Notice of Certain Events.                                     39
Notices.                                                      40
Supplements and Amendments.                                   41
Determination and Actions by the Board of Directors, etc.     41
Successors.                                                   42
Benefits of this Agreement.                                   42
Severability.                                                 42
Governing Law.                                                43
Counterparts.                                                 43
Descriptive Headings.                                         43
Exhibit A -  Certificate of Designation                       45
Exhibit B -  Form of Right Certificate                        51
Exhibit C -  Summary of Rights to Purchase Preferred Shares   58















<PAGE>  45


EXHIBIT A


            FORM OF CERTIFICATE OF DESIGNATION
        SERIES A JUNIOR PARTICIPATING PREFERRED STOCK
                              OF
                      SOMATOGEN, INC.
            (Pursuant to Section 151 of the
             Delaware General Corporation Law)

Somatogen, Inc., a corporation organized and existing under 
the General Corporation Law of the State of Delaware 
(hereinafter called the "Company"), 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 via a duly executed written 
consent, dated as of June 2, 1997:

     Resolved, that pursuant to the authority granted to 
     and vested in the Board of Directors of the Company in
     accordance with the provisions of its Certificate of 
     Incorporation, the Board of Directors hereby creates a
     series of Preferred Stock, par value $.001 per share, 
     of the Company and hereby states the designation and 
     number of shares, and fixes the relative designations 
     and the powers, preferences and rights, and the 
     qualifications, limitations and restrictions thereof 
     (in addition to the provisions set forth in the 
     Certificate of Incorporation of the Company, which 
     are applicable to the Preferred Stock of all classes 
     and series), as follows:

Series A Junior Participating Preferred Stock:
     Designation and Amount.  Three Hundred Fifty 
Thousand (350,000) shares of Preferred Stock, $.001 par 
value, are designated "Series A Junior Participating 
Preferred Stock" with the designations and the powers, 
preferences and rights, and the qualifications, limitations
and restrictions specified herein (the "Junior Preferred 
Stock").  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 Junior 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 Company 
convertible into Junior Preferred Stock.

1.     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 Junior Preferred Stock
with respect to dividends, the holders of shares of Junior
Preferred Stock, in preference to the holders of Common

<PAGE>  46


Stock, par value $.001 per share (the "Common Stock"), of
the Company, 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 April, July, October and January 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 Junior Preferred 
Stock, in an amount per share (rounded to the nearest 
cent) equal to the greater of (a) $l.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 
Junior Preferred Stock.  In the event the Company 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 out-
standing 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 Junior 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 out-
standing 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 Company shall declare a dividend or distribu-
tion on the Junior 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 Junior 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 Junior Preferred Stock from the 
Quarterly Dividend Payment Date next preceding the date 
of issue of such shares, unless the date of issue of such 
<PAGE>  47


shares is prior to the record date for the first Quarterly 
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 Junior 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 Junior 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 Junior 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.

2.     Voting Rights.  The holders of shares of Junior
Preferred Stock shall have the following voting rights:

(A)     Subject to the provision for adjustment hereinafter
set forth, each share of Junior Preferred Stock shall
entitle the holder thereof to 100 votes on all matters
submitted to a vote of the stockholders of the Company.
In the event the Company 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 Junior 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 Designation creating a series of Preferred 
Stock or any similar stock, or by law, the holders of 
shares of Junior Preferred Stock and the holders of shares 
of Common Stock and any other capital stock of the Company 
having general voting rights shall vote together as one 
class on all matters submitted to a vote of stockholders 
of the Company.




<PAGE>  48


(C)     Except as set forth herein, or as otherwise 
provided by law, holders of Junior 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.

3.     Certain Restrictions.

(A)     Whenever quarterly dividends or other dividends
or distributions payable on the Junior 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 Junior Preferred
Stock outstanding shall have been paid in full, the Company
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 Junior 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 Junior Preferred Stock, except
dividends paid ratably on the Junior 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 Junior Preferred Stock, provided that the
Company may at any time redeem, purchase or otherwise
acquire shares of any such junior stock in exchange for 
shares of any stock of the Company ranking junior (either 
as to dividends or upon dissolution, liquidation or winding
up) to the Junior Preferred Stock; or

(iv)     redeem or purchase or otherwise acquire for
consideration any shares of Junior Preferred Stock, or any
shares of stock ranking on a parity (either as to dividends
or upon liquidation, dissolution or winding up) with the
Junior 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.



<PAGE>  49


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

4.     Reacquired Shares.  Any shares of Junior Preferred
Stock purchased or otherwise acquired by the Company in
any manner whatsoever shall be retired and cancelled
promptly after the acquisition thereof.  All such shares
shall upon their cancellation become authorized but 
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 Restated Certificate of Incorporation, or in any 
other Certificate of Designation creating a series of 
Preferred Stock or any similar stock or as otherwise 
required by law.

5.     Liquidation, Dissolution or Winding Up.  Upon 
any liquidation, dissolution or winding up of the Company, 
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 Junior 
Preferred Stock unless, prior thereto, the holders of 
shares of Junior 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 Junior 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 Junior Preferred Stock, except distributions 
made ratably on the Junior 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 
Company 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 Junior 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 out-
standing immediately prior to such event.
<PAGE>  50

6.     Consolidation, Merger, etc.  In case the Company 
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 Junior 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 Company 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 consolida-
tion 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 in the preceding sentence with respect to 
the exchange or change of shares of Junior 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.

7.     No Redemption.  The shares of Junior Preferred
Stock shall not be redeemable.

8.     Rank.  The Junior Preferred Stock shall rank,
with respect to the payment of dividends and the distribu-
tion of assets, junior to all series of any other class of
the Company's Preferred Stock.

9.     Amendment.  The Restated Certificate of Incorpora-
tion of the Company shall not be amended in any manner
which would materially alter or change the powers,
preferences or special rights of the Junior Preferred
Stock so as to affect them adversely without the affirma-
tive vote of the holders of at least two-thirds of the
outstanding shares of Junior Preferred Stock, voting
together as a single class.

In Witness Whereof, the undersigned have executed this
certificate as of June 5, 1997.

                              Andre de Bruin
                              Chairman, President and CEO

                              James C.T. Linfield
                              Secretary





<PAGE>  51


EXHIBIT B

                   FORM OF RIGHT CERTIFICATE

CERTIFICATE NO. R-     _____ RIGHTS

NOT EXERCISABLE AFTER JUNE 5, 2007 OR EARLIER IF REDEMPTION
OR EXCHANGE OCCURS.  THE RIGHTS ARE SUBJECT TO REDEMPTION 
AT $.01 PER RIGHT AND TO EXCHANGE ON THE TERMS SET FORTH IN 
THE RIGHTS AGREEMENT.

RIGHT CERTIFICATE

SOMATOGEN, 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 June 5, 1997 (the "Rights 
Agreement"), between SOMATOGEN, INC., a Delaware corpora-
tion (the "Company"), and CHASEMELLON SHAREHOLDER 
SERVICES, L.L.C. (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., Mountain Time, on June 5, 2007 at the office 
of the Rights Agent designated for such purpose, or at the 
office of its successor as Rights Agent, one one-hundredth 
of a fully paid non-assessable share of Series A Junior 
Participating Preferred Stock, par value $.001 per share 
(the "Preferred Shares"), of the Company, at a purchase 
price of $44.00 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 _______________ based on the Preferred Shares as 
constituted at such date. 

    From and after the time any Person becomes an Acquiring
Person, (as such terms are defined in the Rights 
Agreement), if the Rights evidenced by this Right Certifi-
cate are beneficially owned by (i) an Acquiring Person or 
an Affiliate or Associate of any such Acquiring Person (as 
such terms are defined in the Rights Agreement), (ii) a 
transferee of any such Acquiring Person, Associate or 
Affiliate who becomes a transferee after the Acquiring 
Person becomes such, or (iii) under certain circumstances 
specified in the Rights Agreement, a transferee of any 
such Acquiring Person, Associate or Affiliate who becomes 
a transferee prior to or concurrently with the Acquiring 
Person becoming such, such Rights shall become null and 
void without any further action and no holder hereof 

<PAGE>  52


shall have any right with respect to such Rights from 
and after the time any Person becomes an Acquiring Person.

    As provided in the Rights Agreement, the Purchase 
Price and the number of one one-hundredths of a Preferred 
Share which may be 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, as 
amended from time to time, 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 office of the Rights 
Agent designated for such purpose, 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 $.01 per Right or 
(ii).may be exchanged in whole or in part for shares of 
the Company's Common Stock, par value $.001 per share, or 
Preferred Stock.

    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


<PAGE>  53


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 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:                         Somatogen, Inc.



               
James C.T. Linfield             Andre de Bruin
Secretary                       Chairman, President and CEO


COUNTERSIGNED:

ChaseMellon Shareholder 
Services, L.L.C.
as Rights Agent



By:_____________________     
   Authorized Signature



















<PAGE>  54



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































<PAGE>  55


Form of Reverse Side of Right Certificate -- continued

Signature Guaranteed:

     Signatures must be guaranteed by an "eligible 
guarantor institution" as defined in Rule 17Ad-15 
promulgated under the Securities Exchange Act of 1934, 
as amended.
- -------------------------------------------------------
     The undersigned hereby certifies that (1) the 
Rights evidenced by this Right Certificate are not being 
sold, assigned or transferred by or on behalf of a Person 
who is or was an Acquiring Person, an Interested Stock-
holder or an Affiliate or Associate thereof (as such terms 
are defined in the Rights Agreement); and (2) after due 
inquiry and to the best of the knowledge of the  under-
signed, the undersigned did not acquire the Rights 
evidenced by this Right Certificate from any Person who is 
or was an Acquiring Person, an Interested Stockholder, or 
an Affiliate or Associate thereof.

                              ________________________________
                              Signature


































<PAGE>  56



FORM OF ELECTION TO PURCHASE

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

To ChaseMellon Shareholder Services, L.L.C.

     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


















<PAGE>  57


Form of Reverse Side of Right Certificate -- continued

Signature Guaranteed:

     Signatures must be guaranteed by an "eligible 
guarantor institution" as defined in Rule 17Ad-15 
promulgated under the Securities Exchange Act of 1934, 
as amended.
- -------------------------------------------------------
     The undersigned hereby certifies that (1) the Rights 
evidenced by this Right Certificate are not beneficially 
owned by nor are they being exercised on behalf of an 
Acquiring Person, an Interested Stockholder or an Affiliate
or Associate thereof (as such terms are defined in the 
Rights Agreement); and (2) after due inquiry and to the 
best of the knowledge of the undersigned, the undersigned 
did not acquire the Rights evidenced by this Right 
Certificate from any Person who is or was an Acquiring 
Person, an Interested Stockholder, or an Affiliate or 
Associate thereof.
                              _____________________________
                              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.


















<PAGE>  58


Exhibit C

                    SOMATOGEN, INC.

           Summary of Rights to Purchase
                  Preferred Shares


    On June 2, 1997, the Board of Directors of SOMATOGEN, 
INC. (the "Company") declared a dividend of one preferred 
share purchase right (a "Right") for each outstanding 
share of common stock, par value $.001 per share (the 
"Common Shares"), of the Company.  The dividend is 
effective as of June 12, 1997 (the "Record Date") with 
respect to the stockholders of record on that date.   The 
Rights will also attach to new Common Shares issued after 
the Record Date.  Each Right entitles the registered holder
to purchase from the Company one one-hundredth of a share 
of Series A Junior Participating Preferred Stock, par value
$.001 per share (the "Preferred Shares"), of the Company 
at a price of $44.00 per one one-hundredth of a Preferred 
Share (the "Purchase Price"), subject to adjustment.  Each 
Preferred Share is designed to be the economic equivalent 
of 100 Common Shares.  The description and terms of the 
Rights are set forth in a Rights Agreement dated as of 
June 5, 1997 (the "Rights Agreement"), between the Company 
and ChaseMellon Shareholder Services, L.L.C. (the "Rights 
Agent").

Detachment and Transfer of Rights

    Initially, the Rights will be evidenced by the stock 
certificates representing Common Shares then outstanding, 
and no separate Right Certificates will be distributed.  
Until the earlier to occur of (i) a public announcement 
that a person or group of affiliated or associated persons,
has become an "Acquiring Person" (as such term is defined 
in the Rights Agreement) (in general, an "Acquiring Person"
 is a person, the affiliates or associates of such person, 
or a group, which has acquired beneficial ownership of 15% 
or more of the outstanding Common Shares) or (ii) 10 
business days (or such later date as the Board may 
determine) following the commencement of, or announcement 
of an intention to make, a tender offer or exchange offer 
which would result in the beneficial ownership by an 
Acquiring Person 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.







<PAGE>  59


    The Rights Agreement provides that, until the Distribu-
tion Date (or earlier redemption or expiration of the 
Rights), the Rights will be transferable 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 or 
transfer of any certificates for Common Shares outstanding 
as of 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.

Exercisability of Rights

    The Rights are not exercisable until the Distribution 
Date.  The Rights will expire on June 5, 2007 (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. 
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.

    The Purchase Price payable, and the number of 
Preferred Shares or other securities or property issuable 
or payable, upon exercise of the Rights are subject to 
adjustment from time to time to prevent dilution.  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 sub-
divisions, consolidations or combinations of the Common 
Shares occurring, in any such case, prior to the 
Distribution Date.  With certain exceptions, no adjust-
ment 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 depositary receipts) and in lieu thereof, an adjust-
ment 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.

<PAGE>  60


Terms of 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 $l 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, consolida-
tion 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 anti-dilution 
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.  The 
Preferred Shares would rank junior to any other series 
of the Company's preferred stock.

Trigger of Flip-In and Flip-Over Rights

    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 or any affiliate or associate thereof (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.  This right will commence on the date of public 
announcement that a person has become an Acquiring Person 
(or the effective date of a registration statement 
relating to distribution of the rights, if later) and 
terminate 60 days later (subject to adjustment in the 
event exercise of the rights is enjoined).

    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 to 
an Acquiring Person, its affiliates or associates or 
certain other persons in which such persons have an 
interest, proper provision will be made so that each 
such 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.  


<PAGE>  61


Redemption and Exchange of Rights

At any time prior to the earliest of (i).the close of 
business on the day of the first public announcement that 
a person has become an Acquiring Person, or (ii).the Final 
Expiration Date, the Board of Directors of the Company may 
redeem the Rights in whole, but not in part, at a price of 
$.01 per Right (the "Redemption Price").  In general, 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.  Immediate-
ly 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.  How-
ever, in the event that there is a change in the membership
of the Board of Directors such that a majority of the Board
of Directors is no longer comprised of the current 
Directors and approved Directors, no such redemption shall 
be made for 180 days after such change in the majority of 
the Board of Directors.

    At any time after any Person 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 
designations and the powers, preferences and rights, 
and the qualifications, limitations and restrictions), 
per Right (subject to adjustment).

Amendment of Rights

    The terms of the Rights generally may be amended by 
the Board of Directors of the Company without the consent 
of the holders of the Rights, except that from and after 
such time as the Rights are distributed no such amendment 
may adversely affect the interests of the holders of the 
Rights (excluding the interest of any Acquiring Person).

Additional Information

    A copy of the Rights Agreement has been filed with 
the Securities and Exchange Commission as an Exhibit to 
a Current Report on Form 8-K dated June 10, 1997.  A copy 
of the Rights Agreement is available from the Company by 
writing to:  Investor Relations, Somatogen, Inc., 2545 
Central Avenue, Boulder, Colorado 80301.  This summary 
description of the Rights is not intended to be complete 
and is qualified in its entirety by reference to the 
Rights Agreement, which is hereby incorporated herein 
by reference.

<PAGE>  62




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