1. Departments of Medicine and Biochemistry and The John P. Robarts Research Institute (J.R.B., L.J.W., D.E.T., S.J.K., M.W.H.), University of Western Ontario, London, Ontario, N6A 5K8 Canada
2. Department of Medicine (P.H.R.B.), University of Western Australia, Perth, Western Australia, 6001 Australia
3. Parke-Davis Pharmaceutical Research (R.S.N.), Warner Lambert Company, Ann Arbor, Michigan 48105