Holding(s) in Company

2 July 2007

Microgen plc (the "Company")

Notifiable Interests

The Company received notice from Blackrock, Inc on 29 June 2007 in compliance
with the Disclosure and Transparency Rules that Merrill Lynch International
Investment Funds is interested in 4,140,645 Ordinary Shares representing 4.03%
of the issued share capital of the Company, which is currently 102,651,776
Ordinary Shares.

If you require further information please contact:

Philip Wood, Group Finance Director

Tel: [phone]

www.microgen.co.uk