1. Yorkshire Cancer Research Institute for Cancer Studies, School of Medicine, University of Sheffield, Sheffield S10 2RX, U.K.
2. Department of Structural Biology, Stanford University School of Medicine, Stanford, California 94305
3. Biofocus DPI, Chesterford Research Park, Chesterford Park, Saffron Walden, Essex CB10 1XL, U.K.
4. Cellexus Ltd., Hinchingbrooke Business Park, Huntingdon PE29 6PY, U.K.
5. Domainex Ltd., Cambridge Science Park, Cambridge CB4 0WG, U.K.
6. Summit PLC, Oxford OX14 4RY, U.K.