1. Department of Molecular Microbiology, Faculty of Science, Tokyo University of Agriculture, Sakuragaoka, Setagaya, Tokyo 156-8502, Japan
2. Department of Bioscience, Faculty of Science, Tokyo University of Agriculture, Sakuragaoka, Setagaya, Tokyo 156-8502, Japan
3. Research Institute for Production Development, Sakyo, Kyoto 606-0805, Japan
4. Kobe Pharmaceutical University, Higashinada, Kobe, Hyo̅go 658-8558, Japan
5. Faculty of Science, Ibaraki University, Mito, Ibaraki 310-8512, Japan