1. Department of Physiology (J.T.S., I.P.S., A.J.T., I.J.C.), Monash University, Victoria 3880, Australia
2. Departments of Physiology and Pharmacology (L.M.C.), University of Western Ontario, London, Ontario, Canada N6A 5C1
3. Anatomy and Cell Biology (L.M.C., M.M., K.B., M.N.L.), University of Western Ontario, London, Ontario, Canada N6A 5C1
4. Department of Psychology and Helen Wills Neuroscience Institute (L.J.K.), University of California, Berkeley, California 94720-1650
5. Department of Animal Physiology (M.R.J.), School of Biology, University College of Science, University of Tehran, 14155 Tehran, Iran
6. Department of Physiology and Pharmacology (R.L.G.), West Virginia University, Morgantown, West Virginia 26506-9229
7. Department of Integrative Biology and Helen Wills Neuroscience Institute (T.U., G.E.B.), University of California, Berkeley, California 94720-1650