EPT Disclosure Cambridge Antibody Technology Group Plc

    FORM 38.5
                                        
                 DEALINGS BY CONNECTED EXEMPT PRINCIPAL TRADERS
              (Rule 38.5 of the City Code on Takeovers and Mergers)


1.   KEY INFORMATION

Name of exempt principal      J.P. Morgan Securities Ltd.
trader
Company dealt in              Cambridge Antibody Technology Group Plc
Class  of  relevant  security Ordinary Shares
to  which the dealings  being
disclosed relate (Note 1)
Date of dealing               18 May 2006


2.   DEALINGS (Note 2)

(a)  Purchases and sales

Total number of          Highest price paid      Lowest price paid (Note
securities purchased     (Note 3)                3)

                                                 
5,000                    12.975 GBP              12.975 GBP

     

Total number of          Highest price received  Lowest price received
securities sold          (Note 3)                (Note 3)

                                                 
5,000                    12.975 GBP              12.975 GBP



(b)  Derivatives transactions (other than options)

Product       Long/short       Number of securities   Price per unit
name,         (Note 4)         (Note 5)               (Note 3)
e.g. CFD
                                                      

     
     
(c)  Options transactions in respect of existing securities

(i)  Writing, selling, purchasing or varying

Product     Writing,    Number of   Exerci  Type,     Expiry   Option
name,       selling,    securities  se      e.g.      date     money
e.g. call   purchasing  to which    Price   American           paid/rece
option      , varying   the option          ,                  ived per
            etc.        relates             European           unit
                        (Note 5)            etc.               (Note 3)
                                                               

(ii) Exercising

Product name, e.g. call  Number of securities    Exercise price per unit
option                                           (Note 3)
                                                 
                                                 


3.   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.






Date of disclosure                         19 May 2006
Contact name                               Shoaib Shaikh
Telephone number                           020 7777 0423
Name of offeree/offeror with which         Cambridge Antibody Technology
connected                                  Group Plc
Nature of connection (Note 6)              2


Notes

The Notes on Form 38.5 can be viewed on the Takeover Panels website at
 www.thetakeoverpanel.org.uk