1 Division of Systems Virology, Department of Microbiology and Immunology, The University of Tokyo, Tokyo, Japan; Faculty of Medicine, Kobe University, Kobe, Japan.
2 Division of Systems Virology, Department of Microbiology and Immunology, The University of Tokyo, Tokyo, Japan; The Institute of Medical Science, and Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.
3 Division of Systems Virology, Department of Microbiology and Immunology, The University of Tokyo, Tokyo, Japan.
4 Division of Systems Virology, Department of Microbiology and Immunology, The University of Tokyo, Tokyo, Japan; Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan.
5 First Medical Faculty at Biocev, Charles University, Vestec-Prague, Czechia.
6 Division of Systems Virology, Department of Microbiology and Immunology, The University of Tokyo, Tokyo, Japan; International Research Center for Infectious Diseases, The University of Tokyo, Tokyo, Japan.
7 Division of Systems Virology, Department of Microbiology and Immunology, The University of Tokyo, Tokyo, Japan; International Research Center for Infectious Diseases, The University of Tokyo, Tokyo, Japan; International Vaccine Design Center, The University of Tokyo, Tokyo, Japan; The Institute of Medical Science, and Graduate School of Medicine, The University of Tokyo, Tokyo, Japan; Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Japan; Collaboration Unit for Infection, Joint Research Center for Human Retrovirus infection, Kumamoto University, Kumamoto, Japan; CREST, Japan Science and Technology Agency, Kawaguchi, Japan. Electronic address: keisato@g.ecc.u-tokyo.ac.jp.