Affiliation: | a Tokyo Research Institute, NISSIN Food Products Co., Ltd., 1780 Kitano, Tokorozowa-shi, Saitama 359, Japan b The Institute of Physical and Chemical Research (RIKEN) Wako-shi, Saitama 351-01, Japan c Department of Cellular Biochemistry, University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113, Japan |