1. Laboratories of Neurobiology and Behavior (D.P., Q.K.), The Rockefeller University, New York, New York 10021
2. Neuroendocrinology (E.W.), The Rockefeller University, New York, New York 10021
3. University of Cincinnati Medical School (X.Z.), Cincinnati, Ohio 45267
4. Department of Psychology (M.N.), Boston College, Chestnut Hill, Massachusetts 02467