1. Frontier Research Program, Institute of Physical and Chemical Research (RIKEN), Wako, Saitama, 351-01, Japan.
2. Central Research Laboratories, Ajinomoto Co., Inc., Kawasaki-ku, Kawasaki, 210, Japan.
3. Fujita-Gakuen Health UniversitNr, Toyoake, Aichi, 470-11, Japan