Affiliation: | 1. The State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P. R. China;2. Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing 100101, P. R. China;3. Beijing Institute for Stem Cell and Regenerative Medicine, Beijing 100101, P. R. China;4. University of Chinese Academy of Sciences, Beijing 100049, P. R. China |