Second Price Monitoring Extn

Proteome Sciences PLC
17 July 2006

A second Price Monitoring Extension has been activated in this security.

A second Price Monitoring Extension is activated when the auction matching process would still result in an auction 
price that is a pre-determined percentage above or below the base price. The auction call period is extended for a 
further 5 minutes.  

For details of how base prices are set for each market, please refer to the Guide to Trading Service at 
www.londonstockexchange.com 
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