About the Authors
Department of Human Genetics, Emory University School of Medicine, Atlanta, Georgia, United States of America
Division of Histology and Embryology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
The authors have declared that no competing interests exist.
Conceived and designed the experiments: PJ. Performed the experiments: HT MP. Analyzed the data: HT MP HL DC PJ. Contributed reagents/materials/analysis tools: HL DC PJ. Wrote the paper: HT PJ.