1. Department of Physiology and Pharmacology (R.L.G.), West Virginia University, Morgantown, West Virginia 26506-9229;
2. Departments of Anatomy and Cell Biology (M.N.L.) and Physiology
3. Department of Physiology (J.T.S., M.R.J., A.P., J.I., I.J.C.), Monash University, Victoria 3880, Australia;
4. Pharmacology (L.M.C., C.V.R.d.O.), University of Western Ontario, London, Ontario, Canada N6A 5C1;
5. Animal Physiology Department (M.R.J.), Tehran University, Tehran, Iran;
6. Unité Mixte de Recherche 6175 (A.C.), Institut National de la Recherche Agronomique/Centre National de la Recherche Scientifique, Université de Tours, Haras Nationaux, Institut Fédératif de Recherche 135, Nouzilly, France;
7. Institut National de la Santé et de la Recherche Médicale Unité 862 (P.C.), Institut Francois Magendie, F-33077 Cedex, Bordeaux, France