From the Nathan Kline Institute, Orangeburg, N.Y.; New York University School of Medicine, New York; New York State Institute for Basic Research, Staten Island, N.Y.; Department of Pharmacology, Temple University, Philadelphia; and Neurochemistry Lab, Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry, the Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden.