Offer Update

Microgen PLC
16 April 2008

NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, IN OR INTO
THE UNITED STATES OF AMERICA, CANADA, AUSTRALIA OR JAPAN OR ANY JURISDICTION
WHERE TO DO SO WOULD CONSTITUTE A VIOLATION OF THE RELEVANT LAWS OF SUCH
JURISDICTION

16 April 2008

                           Microgen plc ('Microgen')

                   Statement regarding Scisys plc ('Scisys')

On 11 April 2008, Microgen announced that it had held an informal meeting with
Scisys and was considering its options which may or may not include an offer for
Scisys. An indicative conditional proposal to acquire the issued and to be
issued share capital of Scisys was subsequently submitted by Microgen, which the
Board of Scisys have now rejected. As a result, talks between Microgen and
Scisys regarding a possible offer for Scisys have terminated. However, Microgen
remains interested in a combination of the two companies on the basis of the
proposal previously submitted.

Microgen is interested in 3,670,686 Scisys shares representing approximately
12.89% of the issued share capital of Scisys and remains the third largest
shareholder in Scisys. Microgen and Scisys have collaborated in a number of
business areas and it is anticipated that this operational relationship will
continue.


Enquiries:

Microgen plc                                                 Tel: [phone]
Martyn Ratcliffe
Philip Wood

Arbuthnot Securities Limited                                 Tel: [phone]
Tom Griffiths
Alasdair Younie

Financial Dynamics                                           Tel: [phone]
Giles Sanderson
Haya Chelhot


Dealing Disclosure Requirements

Under the provisions of Rule 8.3 of the Takeover Code (the 'Code'), if any
person is, or becomes, 'interested' (directly or indirectly) in 1% or more of
any class of 'relevant securities' of Microgen or of Scisys, all 'dealings' in
any 'relevant securities' of that company (including by means of an option in
respect of, or a derivative referenced to, any such 'relevant securities') must
be publicly disclosed by no later than 3.30 p.m. (London time) on the London
business day following the date of the relevant transaction. This requirement
will continue until the date on which the offer becomes, or is declared,
unconditional as to acceptances, lapses or is otherwise withdrawn or on which
the 'offer period' otherwise ends. If two or more persons act together pursuant
to an agreement or understanding, whether formal or informal, to acquire an
'interest' in 'relevant securities' of Microgen or Scisys, they will be deemed
to be a single person for the purpose of Rule 8.3.

Under the provisions of Rule 8.1 of the Code, all 'dealings' in 'relevant
securities' of Microgen or Scisys by Microgen or Scisys, or by any of their
respective 'associates', must be disclosed by no later than 12.00 noon (London
time) on the London business day following the date of the relevant transaction.

A disclosure table, giving details of the companies in whose 'relevant
securities''dealings' should be disclosed, and the number of such securities in
issue, can be found on the Takeover Panel's website at
www.thetakeoverpanel.org.uk.

'Interests in securities' arise, in summary, when a person has long economic
exposure, whether conditional or absolute, to changes in the price of
securities. In particular, a person will be treated as having an 'interest' by
virtue of the ownership or control of securities, or by virtue of any option in
respect of, or derivative referenced to, securities.

Terms in quotation marks are defined in the Code, which can also be found on the
Panel's website. If you are in any doubt as to whether or not you are required
to disclose a 'dealing' under Rule 8, you should consult the Panel.




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