[1] Hiroshima Univ, Dept Hematol & Oncol, Res Inst Radiat Biol & Med, Hiroshima, Japan
[2] Kagawa Univ, Fac Med, Dept Lab Med, Takamatsu, Kagawa 760, Japan
[3] Yasuda Womens Univ, Fac Pharm, Dept Life Sci, Hiroshima, Japan
[4] Nagoya Univ, Grad Sch Med, Dept Biochem, Nagoya, Aichi 4648601, Japan
[5] Hiroshima Univ, Res Inst Radiat Biol & Med, Dept Stem Cell Biol, Hiroshima, Japan