[1] NCI, Tumor Biol Sect, Radiat Biol Branch, NIH, Bethesda, MD 20892 USA
[2] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA
[3] Johns Hopkins Med Inst, Dept Med, Div Cardiol, Baltimore, MD 21287 USA
[4] Johns Hopkins Med Inst, Dept Biomed Engn, Baltimore, MD 21287 USA
[5] Univ Calif Los Angeles, Ctr Hlth Sci, Dept Mol & Med Pharmacol, Los Angeles, CA 90095 USA
[6] Louisiana State Univ, Hlth Sci Ctr, Dept Cellular & Mol Physiol, Shreveport, LA 71130 USA