1. Biotron Institute, Kyushu Univ.; Hakozaki Fukuoka 812-8581 Japan
2. Center for Marine Environmental Studies (CMES); Ehime Univ.; Bunkyo-cho 3 Matsuyama 790-8577 Japan
3. Dep. of Applied Biological Chemistry; Graduate School of Agriculture and Life Sciences, The Univ. of Tokyo; Yayoi 1-1-1, Bunkyo-ku Tokyo 113-8657 Japan