1. Molecular Endocrinology Group (J.H.D.B., S.K., G.R.W.), Division of Medicine and Medical Research Council, Clinical Sciences Centre, Imperial College London, Hammersmith Hospital, London W12 0NN, United Kingdom;
2. Department of Cell and Molecular Biology (K.N., B.V.), Karolinska Institute, S-171 77 Stockholm, Sweden;
3. Biophysics Oral Growth and Development (A.B., P.G.T.H.), Institute of Dentistry, Barts and The London School of Medicine, Queen Mary University of London, London E1 1BB, United Kingdom;
4. Department of Prosthetic Dentistry (P.G.T.H.), Eastman Dental Institute, University College London, London WC1X 8LD, United Kingdom