1. Department of Stem Cell Biology, Institute for Frontier Medical Sciences, Kyoto University, Kyoto 606-8507, Japan.
2. Department of Gastroenterology and Hepatology, Graduate School of Medicine, Kyoto University, Kyoto 606-8507, Japan.
3. Core Research in Embryonic Science and Technology (CREST), Japan Science and Technology Agency, Kawaguchi 332-0012, Japan.
4. Gladstone Institute of Cardiovascular Disease, San Francisco, CA 94158, USA.
5. Center for Induced Pluripotent Stem (iPS) Cell Research and Application, Institute for Integrated Cell-Material Sciences, Kyoto University, Kyoto 606-8507, Japan.