M Hirayama1, K Toyota1, G Yamaguchi1, H Hidaka1, H Naito1,2. 1. a Bio Science Laboratories, Meiji Seika Kaisha, Ltd. , 5-3-1 Chiyoda, Sakado-shi , Saitama 350-02 , Japan. 2. b Kyoritsu Women's University , 2-2-1 Hitotsubashi, Chiyoda-ku , Tokyo 101 , Japan.