1. From the Laboratory of Neuroendocrine Regulation, Department of Nutrition and Food Science, Massachusetts Institute of Technology, Cambridge, the Section of Neurology, Department of Medicine, Peter Bent Brigham Hospital, and the Department of Neurology, Harvard Medical School, Boston (address reprint requests to Dr. Wurtman at 56–245, Department of Nutrition and Food Science, Massachusetts Institute of Technology, Cambridge, MA 02139; please enclose a stamped, self-addressed envelope).