1. Biological Research Laboratories, Nissan Chemical Industries Ltd., Saitama, Japan;
2. Department of Clinical Application, Center for iPS Cell Research and Application, Kyoto University, Kyoto, Japan;
3. Department of Anatomy, Miyazaki University Faculty of Medicine, Miyazaki, Japan;
4. Division of Stem Cell Therapy, Center for Stem Cell Biology and Regenerative Medicine, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan; and
5. Department of Regenerative Medicine, Chiba University Graduate School of Medicine, Chiba, Japan