1. Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
2. Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
3. Bell Research Center for Reproductive Health and Cancer, Nagoya 460-0003, Japan.
4. Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, Sapporo 060-8638, Japan.
5. Department of Pathology, Sapporo Medical University Graduate School of Medicine, Sapporo 060-8556, Japan.
6. Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan.
7. Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto 606-8501, Japan.
8. Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto 606-8507, Japan.
9. Research Center for Animal Life Science, Shiga University of Medical Science, Otsu 520-2192, Japan.
10. Fukuzumi Obstetrics and Gynecology Hospital, Sapporo 062-0043, Japan.
11. Ohkouchi Obstetrics and Gynecology Hospital, Sapporo 060-0062, Japan.