1. CAS Key Laboratory of Genomic and Precision Medicine, Collaborative Innovation Center of Genetics and Development, College of Future Technology, Beijing Institute of Genomics, Chinese Academy of Sciences and China National Center for Bioinformation, Beijing 100101, P. R. China
2. Sino-Danish College, University of Chinese Academy of Sciences, Beijing 101408, P. R. China
3. Institute of Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing 100101, China