1. Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 2217-14 Hayashi-Cho, Takamatsu, Kagawa 761-0395, Japan
2. Biological Resource Center (NBRC), National Institute of Technology and Evaluation (NITE), 2-49-10 Nishihara, Shibuya-ku, Tokyo 151-0066, Japan
3. Mitsubishi-Chemical Foods Corporation, 2-13-10 Nihonbashi, Chuo-ku, Tokyo 103-0027, Japan