1. Department of Anatomy, Histology & Embryology, Key Laboratory of Medical Imaging Computing and Computer Assisted Intervention of Shanghai, School of Basic Medical Sciences, Shanghai Medical College, Fudan University, Shanghai 200032, China
2. State Key Laboratory of Molecular Biology, Shanghai Key Laboratory of Molecular Andrology, CAS Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences-University of Chinese Academy of Sciences, Shanghai 200031, China; School of Life Science and Technology, Shanghai Tech University, Shanghai 201210, China
3. Key Lab of Reproduction Regulation of NPFPC-Shanghai Institute of Planned Parenthood Research, Fudan University Reproduction and DevelopmentInstitution, Shanghai 200032, China
4. Department of Biological Sciences, University of Delaware, Newark, DE 19716-2590, USA
5. School of Biomedical Sciences, The University of Hong Kong, Hong Kong SAR, P. R. China