[1] Kyoto Univ, Inst Virus Res, Lab Cell Regulat, Kyoto 606, Japan
[2] Tokai Univ, Sch Med, Dept Mol Life Sci, Isehara, Kanagawa 25911, Japan
[3] Shimane Univ, Fac Med, Dept Publ Hlth, Izumo, Shimane, Japan
[4] Nippon Med Sch, Dept Mol Anat, Tokyo 113, Japan
[5] Kyoto Univ, Grad Sch Biostudies, Immunobiol Lab, Kyoto, Japan
[6] Kumamoto Univ, Grad Sch Med Sci, Fac Life Sci, Dept Cell Pathol, Kumamoto, Japan
[7] Dana Farber Canc Inst, Dept Med Oncol, Boston, MA 02115 USA
[8] Dana Farber Canc Inst, Canc Vaccine Ctr, Boston, MA 02115 USA