1. Department
of Applied Biological Science, Tokyo University of Sciences, Noda, Chiba 278-8510, Japan
2. Department
of Virology II, National Institute of Infectious Diseases, Shinjuku-ku, Tokyo 162-8640, Japan
3. Faculty
of Pharmaceutical Sciences, Tokyo University of Science, Noda, Chiba 278-8510, Japan
4. Graduate
School of Life and Environmental Sciences, Kyoto Prefectural University, Sakyo-ku, Kyoto 606-8522, Japan