*Toshinori Matsuoka¹, Miwako Yamasaki², Manabu Abe³, Yukiko Matsuda⁴, Hiroyuki Morino⁴, Hideshi Kawakami⁴, Kenji Sakimura³, Masahiko Watanabe², Kouichi Hashimoto¹ (1.Department of Neurophysiology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan, 2.Department of Anatomy, Hokkaido University Graduate School of Medicine, Sapporo, Japan, 3.Department of Animal Model Development, Brain Research Institute, Niigata University, Niigata, Japan, 4.Department of Epidemiology, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan)

*Masashi Watanave, Nobutaka Takahashi, Ayumu Konno, Hirokazu Hirai (Dept Neurophysiol, Univ of Gunma, Maebashi, Japan)