1. Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan.
2. Center for iPS Cell Research and Application, Kyoto University, 53 Kawahara-cho, Shogoin Yoshida, Sakyo-ku, Kyoto 606-8507, Japan.
3. Japan Science and Technology Agency (JST), Core Research for Evolutional Science and Technology, Japan Science and Technology Agency (CREST)/Precursory Research for Embryonic Science and Technology (PRESTO), Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan.
4. The Hakubi Center for Advanced Research, Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto 606-8302, Japan.
5. JST, CREST/Exploratory Research for Advanced Technology (ERATO), Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan.
6. Institute for Integrated Cell-Material Sciences, Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto 606-8501, Japan.