1. Yakult Honsha Co., Ltd., Central Research Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
2. Department of Molecular Microbiology, Tokyo University of Agriculture, 1-1-1 Sakuragaoka, Setagaya-ku, Tokyo 156-8502, Japan
3. NODAI Genome Research Center, Tokyo University of Agriculture, 1-1-1 Sakuragaoka, Setagaya-ku, Tokyo 156-8502, Japan