1. Department of Biochemistry; Kawasaki Medical School; Kurashiki Okayama 701-0192 Japan
2. Department of Biomolecular Science, Faculty of Science; Toho University, Funabashi; Chiba 274-8510 Japan
3. Department of Biochemistry, Faculty of Science; Okayama University of Science; Okayama Okayama 700-0005 Japan