1. Aminoscience Laboratories, Ajinomoto Co., Inc., 1-1, Suzuki-cho, Kawasaki-ku, Kawasaki, 210-8681 Japan, and Graduate School of Science and Engineering and Frontier Collaborative Research Center, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552 Japan %kunisuke_izawa@ajinomoto.com; tikariya@apc.titech.ac.jp