1. Division of Antiviral Chemotherapy, Joint Research Center for Human Retrovirus Infection, Kagoshima University, Kagoshima, Japan
2. Department of Virology II, National Institute of Infectious Diseases, Tokyo, Japan
3. Division of Biological Information Technology, Joint Research Center for Human Retrovirus Infection, Kagoshima University, Kagoshima, Japan
4. Department of Microbiology, Division of Medical Sciences, Graduate School of Interdisciplinary Research, University of Yamanashi, Chuo, Yamanashi, Japan
5. Department of Chemistry, Birla Institute of Technology, Mesra, Ranchi, India