1. Division of Radioprotectants, Department of Pharmacology and Molecular Therapeutics, F. Edward Hébert School of Medicine, Uniformed Services University of the Health Sciences, Bethesda, Maryland 20814
2. Pathology Department, Research Services, Naval Medical Research Center, Silver Spring, Maryland 20910
3. Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, Maryland 20814