1. Developmental Endocrinology Research Group (D.K., M.T.D.), Clinical and Molecular Genetics Unit, University College London Institute of Child Health, London WC1N 1EH, United Kingdom
2. Divisions of Stem Cell Biology and Developmental Genetics (K.R., R.L.-B.), Medical Research Council National Institute for Medical Research, London NW1 2DA, United Kingdom
3. Molecular Neuroendocrinology (I.C.A.F.R.), Medical Research Council National Institute for Medical Research, London NW1 2DA, United Kingdom