1. Molecular Endocrinology Group (J.H.D.B., J.G.L., M.S.C., G.R.W.), Department of Medicine, Imperial College London, Hammersmith Campus, London W12 0NN, United Kingdom
2. Centre for Oral Growth and Development (A.B.), Queen Mary College, University of London, London E1 4NS, United Kingdom
3. The Mellanby Centre for Bone Research (H.E., P.C.), Department of Human Metabolism, University of Sheffield, Sheffield S10 2RX, United Kingdom
4. Garvan Institute for Medical Research (P.C.), Sydney, New South Wales 2010, Australia
5. Department of Genetics (X.S., S.X., Y.M.), Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan