PROTEOPREP LICENSE AGREEMENT WITH SIGMA-ALDRICH

9th April 2010

Proteome Sciences plc ("Proteome Sciences") is pleased to announce that it has entered into a non-exclusive license agreement with Sigma-Aldrich Corporation ("Sigma") under which Sigma will be able to continue selling products under Proteome's registered trademark ProteoPrep® in Europe, Japan and Australia. Sigma is the world's largest supplier of research biochemicals and organic chemicals with over one million customers.

There are currently eleven ProteoPrep® kits available from Sigma and the license will also include all future products sold under the ProteoPrep® trademark that contain chemicals and reagents for the disruption of cells, tissues or other biological material and the extraction of biological molecules like proteins, lipids and carbohydrates. It also covers methods and processes relating to assays for the diagnosis of diseases and chemical markers determining targets for drugs and for determining proteins and peptides by disruption of cells, tissues or other biological material. The license provides Proteome with a signature fee and royalties on all ProteoPrep® sales in the jurisdictions listed above.

Commenting on the license Christopher Pearce, Chief Executive of Proteome Sciences said:

"We are delighted to have concluded the license with Sigma-Aldrich Corporation for the ProteoPrep® trademark and look forward to receiving this new stream of revenue from royalties generated by their successful and expanding range of ProteoPrep¨ products."