Holding(s) in Company

Microgen PLC
23 February 2007



23 February 2007


Microgen plc (the 'Company')

Notifiable Interests

The Company received notice on 22 February 2007 under Sections 198-202 of the
Companies Act 1985 that BlackRock Investment Management (UK) Limited is
interested in 8,641,231 Ordinary Shares representing 8.42% of the issued share
capital of the Company, which is currently 102,651,776 Ordinary Shares.



The shares are registered in the name of:


                                                        No. of shares
BlackRock Investment Management (UK) Limited                8,641,231




If you require further information please contact:

G.E. Liddle, Company Secretary
Tel: [phone]

www.microgen.co.uk




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