1. State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing 100050, China
2. State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
3. Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing 100101, China
4. National Stem Cell Resource Center, Chinese Academy of Sciences, Beijing 100101, China
5. Medical School of Kunming University of Science and Technology, Kunming, 650031, China