1. Biological Sciences Research Center, Department of Psychiatry and Neurobiology Program, University of North Carolina School of Medicine, Chapel Hill 27514
2. Biological Sciences Research Center, Department of Biochemistry and Nutrition and Neurobiology Program, University of North Carolina
3. Biological Sciences Research Center, University of North Carolina, and Burroughs Wellcome Company, Research Triangle Park 27709
4. Biological Sciences Research Center, Departments of Medicine and Pharmacology and Neurobiology Program, University of North Carolina