1. From the Department of Human Genetics (M.I., K.M.), Research Institute for Radiation Biology and Medicine, Department of Clinical Laboratory Medicine (H.N., T.O., M.K.), Department of Medicine and Molecular Science (T.I., N.M., K.C.), and Department of Cardiovascular Physiology and Medicine (M.Y.), Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan.