Hideaki Kamata1, Yoshihiro Tsuchiya, Tomoichiro Asano. 1. Laboratory of Biomedical Chemistry, Department of Molecular Medical Science, Graduate School of Biomedical Science, Hiroshima University, Kasumi 1-2-3, Minami-ku, Hiroshima, 734-8553, Japan. hkamata@hiroshima-u.ac.jp