1. Center for Innovation in Immunoregulation Technology and Therapeutics, Kyoto University Graduate School of Medicine, Konoe-cho Yoshida, Sakyo-ku, Kyoto, Kyoto 606-8501, Japan.
2. Drug Discovery Research, Astellas Pharma Inc., Miyukigaoka, Tsukuba, Ibaraki 305-8585, Japan.
3. Department of Experimental Immunology, WPI Immunology Frontier Research Center, Osaka University, Yamadaoka, Suita, Osaka 565-0871, Japan.
4. Department of Experimental Pathology, Institute for Frontier Medical Sciences, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto, Kyoto 606-8507, Japan.
5. Department of Frontier Research in Tumor Immunology, Center of Medical Innovation and Translational Research, Graduate School of Medicine, Osaka University, Suita, Osaka 565-0871, Japan.
6. Astellas Research Institute of America, Skokie, IL 60077, USA.