1. Krebs Institute for Biomolecular Research and Department of Information Studies, University of Sheffield, Western Bank, Sheffield S10 2TN, United Kingdom
2. Current address: Arena Pharmaceuticals, 6166 Nancy Ridge Drive, San Diego, CA 92121
3. Tripos Inc., 1699 South Hanley Road, St. Louis, MO 63144
4. Glaxo Wellcome Medicines Research Centre, Gunnells Wood Road, Stevenage SG1 2NY, United Kingdom
5. Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, United Kingdom