1. Department of Experimental Pathology, Institute for Frontier Medical Sciences, Kyoto University, Kyoto 606-8507, Japan.
2. Department of Rheumatology and Haematology, Tohoku University Graduate School of Medicine, Sendai 980-8574, Japan.
3. Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan.
4. Laboratory of Experimental Immunology, World Premier International Immunology Frontier Research Center, Osaka University, Suita 565-0871, Japan.