RNS Number:2796E
Bear Stearns Intl. Trading Ltd
08 June 2006


                                FORM 8.3







    DEALINGS BY PERSONS WITH INTERESTS IN SECURITIES REPRESENTING 1% OR MORE

              (Rule 8.3 of the City Code on Takeovers and Mergers)



1.         KEY INFORMATION


Name of person dealing  (Note 1)             Bear Stearns International Trading Limited
Company dealt in                             Cambridge Antibody Technology Plc
Class of relevant security to which the      Ordinary
dealings being disclosed relate (Note 2)
Date of dealing                              7/6/2006



2.         INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE



(a) Interests and short positions (following dealing) in the class of relevant
security dealt in (Note 3)


                                     Long                      Short
                                     Number      (%)           Number      (%)


(1) Relevant securities              1,960,559   3.686%        1,033,103   1.942%
(2) Derivatives (other than options)
(3) Options and agreements to
purchase/sell
Total                                1,960,559   3.686%        1,033,103   1.942%



(b) Interests and short positions in relevant securities of the company, other
than the class dealt in (Note 3)


Class of relevant security:                  Long               Short
                                             Number       (%)   Number    (%)
(1) Relevant securities
(2) Derivatives (other than options)
(3) Options and agreements to purchase/sell
Total



(c)        Rights to subscribe (Note 3)


Class of relevant security:       Details


3.         DEALINGS (Note 4)



(a)               Purchases and sales


Purchase/Sale    Number of           Currency    Price per unit (Note
                 Securities                      5)
B                646                 GBP         1305.5



(b)      Derivatives transactions (other than options)










(c)        Options transactions in respect of existing securities

(i)         Writing, selling, purchasing or varying


Product    Writing,      Number of     Exercise  Type, e.g. Expiry   Option
name,e.g.  selling,      securities to price     American,  date     money paid/
call       purchasing,   which the               European            received
option     varying etc.  option                  etc.                per unit
                         relates (Note                               (Note 5)
                         7)


 (ii)       Exercising


Product name, e.g. Number of securities     Exercise price per unit (Note 5)
call option




(d)        Other dealings (including new securities) (Note 4)


Nature of transaction (Note 8)     Details              Price per unit (if
                                                        applicable) (Note 5)




4.         OTHER INFORMATION



Agreements, arrangements or understandings relating to options or derivatives



Full details of any agreement, arrangement or understanding between the person
disclosing and any other person relating to the voting rights of any relevant
securities under any option referred to on this form or relating to the voting
rights or future acquisition or disposal of any relevant securities to which any
derivative referred to on this form is referenced.  If none, this should be
stated.



..............................................................................

 ........................................................................



Is a Supplemental Form 8 attached? (Note 9)
            NO




Date of disclosure                                 8/6/2006

Contact name                                       Emma Braham

Telephone number                                   020 7516 6602

If a connected EFM, name of offeree/offeror with   N/A
which connected
If a connected EFM, state nature of connection     N/A
(Note 10)




                      This information is provided by RNS
            The company news service from the London Stock Exchange
END

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