1. Drug Discovery Program, University of Michigan Cancer Center, Departments of Internal Medicine and Medicinal Chemistry, University of Michigan, 1500 E. Medical Center Drive, Ann Arbor, Michigan 48109-0934, Laboratory of Cellular Carcinogenesis and Tumor Promotion and Laboratory of Experimental Carcinogenesis, National Cancer Institute, Bethesda, Maryland 20892, Institute of Biochemistry, University of Cologne, Cologne, Germany D-50674, and Department of Biochemistry, University of Alberta, Edmonton,...