[1] Kagoshima Univ, Grad Sch Med & Dent Sci, Ctr Chron Viral Dis, Div Antiviral Chemotherapy, Kagoshima 8908544, Japan
[2] Tokyo Med & Dent Univ, Inst Biomat & Bioengn, Lab Chem Biosci, Tokyo 1010062, Japan
[3] Kyoto Univ, Grad Sch Med, Dept Anat & Dev Biol, Kyoto 6068501, Japan