About the Authors

Da-yong Zhang

Affiliation Department of Anatomy and Histology and Embryology, Shanghai Medical College of Fudan University, Shanghai, People's Republic of China

Hai-jie Wang

Affiliation Department of Anatomy and Histology and Embryology, Shanghai Medical College of Fudan University, Shanghai, People's Republic of China

Yu-zhen Tan

yztan@shmu.edu.cn

Affiliation Department of Anatomy and Histology and Embryology, Shanghai Medical College of Fudan University, Shanghai, People's Republic of China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: Y-ZT D-YZ. Performed the experiments: D-YZ H-JW. Analyzed the data: H-JW D-YZ. Wrote the paper: D-YZ Y-ZT H-JW.