1. Division of Regenerative Medicine, Center for Molecular Medicine, Jichi Medical University, Tochigi, Japan.
2. Laboratory of Developmental Engineering, Department of Life Sciences, School of Agriculture, Meiji University, Kanagawa, Japan.
3. Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan.
4. Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan.
5. PRESTO, Japan Science and Technology Agency, Tokyo, Japan.
6. CREST, Japan Science and Technology Agency, Tokyo, Japan.