1. Division of Neurobiology (T.A.M.), Department of Neurology and Neuroscience, Weill-Cornell Medical College, New York, New York 10021
2. Harold and Margaret Milliken Hatch Laboratory of Neuroendocrinology (T.A.M., B.S.M.), The Rockefeller University, New York, New York 10065
3. Departments of Neuroscience (L.S.L.), Merck Research Laboratories, West Point, Pennsylvania 19486
4. Molecular Endocrinology (S.E.A.), Merck Research Laboratories, West Point, Pennsylvania 19486