1. Molecular Endocrinology Group (P.J.O., C.B.H., G.R.W.), Division of Medicine and Medical Research Council Clinical Sciences Centre, Faculty of Medicine, Imperial College London, Hammersmith Hospital, London W12 0NN, United Kingdom
2. Gene Regulation Section (H.S., M.K., K.K., S.-Y.C.), Laboratory of Molecular Biology, National Cancer Institute, Bethesda, Maryland 20892-4264