[1] Okayama Univ, Fac Med Dent & Pharmaceut Sci, Dept Tumor Microenvironm, 2-5-1 Shikata Cho,Kita Ku, Okayama 7008558, Japan
[2] Kagoshima Univ, Joint Res Ctr Human Retrovirus Infect, Div Biol Informat Technol, Kagoshima, Japan
[3] Natl Inst Infect Dis, Management Dept Biosafety, Lab Anim, Tokyo, Japan
[4] Natl Inst Infect Dis, Pathogen Bank, Tokyo, Japan