1. Department of Life Science, College of Science, Rikkyo University, Toshima, Tokyo, Japan
2. Department of Bacteriology I, National Institute of Infectious Diseases, Shinjuku, Tokyo, Japan
3. Graduate School of Horticulture, Chiba University, Matsudo, Chiba, Japan
4. Department of Biotechnology, Toyama Prefectural University, Imizu, Toyama, Japan