1. Division of Immunogenetics, Department of Immunobiology and Neuroscience and Research Center for Advanced Immunology, Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan
2. Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Tokyo 102-0076, Japan
3. Institut de Recherches Cliniques de Montréal, Université de Montréal, Montréal, Quebec H2W 1R7, Canada