Affiliation: | Department of Biological Science, Graduate School of Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima 739–8526, Japan (T.I., M.N., J.F., Y.T.); and;Department of Biological Sciences, Graduate School of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113–0033, Japan (S.I.) |