1. Department of Chemistry, University of Southern California, Los Angeles, California 90089-0744
2. Bone & Musculoskeletal Programme, Institute of Medical Sciences, University of Aberdeen, Aberdeen AB25 2ZD, U.K.
3. Procter & Gamble Pharmaceuticals, Mason, Ohio 45040
4. Molecular Medicine, National Heart and Lung Institute, Imperial College London, London SW7 2AZ, U.K.
5. Nuffield Department of Orthopaedic Surgery, Oxford University, Institute of Musculoskeletal Sciences, Nuffield Orthopaedic Center, Headington, Oxford OX3 7LD, U.K.