Affiliation: | 1. Department of Biology, Yokohama City University, 236, Kanazawa, Yokohama, Japan 2. Frontier Research Program, Institute of Physical and Chemical Research (Riken), 351-01, Wako, Saitama, Japan 3. Central Research Laboratories, Ajinomoto Co. Inc., 210, Kawasaki, Kawasaki, Japan 4. Institut für Molekularbiologic und Biochemie der Freien Universit?t Berlin, Arnimallee 22, W-1000, Berlin 33, Federal Republic of Germany 5. Biological Laboratory, Nippon Medical School, 211, Nakahara, Kawasaki, Japan
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