1. Radiation Biology Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland.
2. Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona.
3. Department of Neurology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
4. Department of Experimental and Clinical Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
5. Cardiovascular Research Center, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
6. The Johns Hopkins Medical Institutions, Baltimore, Maryland.
7. Department of Clinical Medicine, Section of General Pathology, University of Perugia, Italy.
8. Department of Chemistry, Sonoma State University, Rohnert Park, California.