Affiliation: | 1. Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA (UK), Fax: (+44)?1223‐766‐091;2. Present address: Phico Therapeutics Ltd. Babraham, CB22 3AT (UK);3. Present address: Department of Pharmaceutical Biotechnology, Saarland University, P.?O. Box 151150, 66041 Saarbrücken (Germany) |