1. Department of Chemistry, University of Arizona, Tucson, Arizona 85721; Division of Cardiology, Department of Medicine and Department of Biomedical Engineering, The Johns Hopkins Medical Institutions, Baltimore, Maryland 21287; Tumor Biology Section, Radiation Biology Branch, National Cancer Institute, NIH, Bethesda, Maryland 20892; Department of Chemistry and Biochemistry, and Department of Molecular and Medical Pharmacology, Center for the Health Sciences, University of California, Los Angeles,...