1. State Key Laboratory of Stem Cell and Reproductive Biology, Institute of ZoologyChinese Academy of SciencesBeijing China
2. Key Laboratory of Fertility Preservation and Maintenance of Ministry of EducationNingxia Medical UniversityYinchuan Ningxia China
3. Institute of Reproductive Medicine, School of MedicineNantong UniversityNantong China
4. The Mary M. Wohlford Laboratory for Male Contraceptive Research, Center for Biomedical ResearchPopulation CouncilNew York New York