About the Authors

Xiaojing Qian

Affiliations The Mary M. Wohlford Laboratory for Male Contraceptive Research, Center for Biomedical Research, Population Council, New York, New York, United States of America, Department of Anatomy, Histology and Embryology, School of Basic Medicine, Peking Union Medical College, Beijing, China

Dolores D. Mruk

Affiliation The Mary M. Wohlford Laboratory for Male Contraceptive Research, Center for Biomedical Research, Population Council, New York, New York, United States of America

C. Yan Cheng

Y-Cheng@popcbr.rockefeller.edu

Affiliation The Mary M. Wohlford Laboratory for Male Contraceptive Research, Center for Biomedical Research, Population Council, New York, New York, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CYC. Performed the experiments: XQ CYC. Analyzed the data: XQ DDM CYC. Contributed reagents/materials/analysis tools: XQ DDM CYC. Wrote the paper: CYC.