1. Division of Stem Cell Therapy, Center for Stem Cell Biology and Regenerative Medicine, Institute of Medical Science; University of Tokyo; Tokyo Japan
2. Wellcome Trust-Medical Research Council Cambridge Stem Cell Institute; University of Cambridge; Cambridge UK
3. Laboratory of Biochemistry and Molecular Biology; The Rockefeller University; New York USA
4. Institute for Stem Cell Biology and Regenerative Medicine; Stanford University School of Medicine; Stanford USA
5. Department of Molecular Life Sciences; Tokai University School of Medicine; Isehara Japan