1. Molecular Endocrinology Group (J.H.D.B., A.J.W., E.M., R.S., M.A., G.R.W.), Division of Medicine and Medical Research Council (MRC) Clinical Sciences Centre, Imperial College London, Hammersmith Hospital, London W12 0NN, United Kingdom
2. Biophysics Centre for Oral Growth and Development (A.B., P.G.T.H.), Institute of Dentistry, Bart’s and The London School of Medicine, Queen Mary University of London, London E1 1BB, United Kingdom
3. Division of Restorative Dental Sciences (P.G.T.H.), University College London Eastman Dental Institute, London WC1X 8LD, United Kingdom
4. Institut de Génomique Fonctionnelle (F.F., J.S.), Université de Lyon, Université Claude Bernard Lyon I and Ecole Normale Supérieure de Lyon, Centre National de la Recherche Scientifique, Institut National de la Recherche Agronomique, 69364 Lyon, France
5. Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire and Service de Génétique Médicale (S.C., G.V.), Université Libre de Bruxelles, B-1070 Bruxelles, Belgium
6. Department of Medicine and Committee on Molecular Medicine (R.E.W.), Chicago, Illinois 60637
7. Departments of Medicine and Pediatrics (S.R.), Committees on Genetics and Molecular Medicine and J. P. Kennedy Mental Retardation and Developmental Disabilities Center, University of Chicago, MC3090, Chicago, Illinois 60637