1. Department of Immunogenetics, Graduate School of Medical and Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
2. Laboratory of Embryonic Stem Cell Research, Stem Cell Research Center, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan
3. Laboratory of Molecular Medicine, Human Genome Center, Institute of Medical Science, University of Tokyo, Tokyo, Japan
4. Department of Development and Differentiation, Institute for Frontier Medical Sciences, Kyoto University, Kyoto, Japan