[1] RIKEN, Res Ctr Allergy & Immunol, Lab Immune Receptor, Tsukuba, Ibaraki 3050074, Japan
[2] Univ Tsukuba, Inst Basic Med Sci, Dept Immunol, Tsukuba, Ibaraki 3058575, Japan
[3] Japan Sci & Technol Agcy, PRESTO, Saitama 3320012, Japan
[4] Univ Calif San Francisco, Dept Microbiol & Immunol, San Francisco, CA 94143 USA
[5] Univ Calif San Francisco, Canc Res Inst, San Francisco, CA 94143 USA