1. Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, Tokida 3-15-1, Uea, Nagano 386-8567, Japan
2. Department of Virology II, National Institute of Infectious Diseases, Toyama 1-23-1, Shinjuku-ku, Tokyo 162-8640, Japan
3. Department of Applied Biological Sciences, Tokyo University of Science, Yamazaki 2641, Noda-shi, Chiba 278-8510, Japan
4. Research Center for Drug and Vaccine Development, National Institute of Infectious Diseases, Toyama 1-23-1, Shinjuku-ku, Tokyo 162-8640, Japan
5. Department of Virology III, National Institution of Infections Deseases, Gakuen 4-7-1, Musashimurayama-shi, Tokyo 208-0011, Japan