[1] Nagasaki Univ, Grad Sch Biomed Sci, Div Mol Pharmacol Infect Agents, Nagasaki, Japan
[2] FDA, Ctr Biol Evaluat & Res, Lab Mol Tumor Biol, Bethesda, MD USA
[3] Univ Tokyo, Inst Med Sci, Div Cellular & Mol Biol, Minato Ku, Tokyo, Japan
[4] Kyushu Univ, Med Inst Bioregulat, Div Mol & Cellular Immunol, Fukuoka, Japan