About the Authors

Chuan-Yun Li

Affiliation Center for Bioinformatics, National Laboratory of Protein Engineering and Plant Genetic Engineering, College of Life Sciences, Peking University, Beijing, People's Republic of China

Xizeng Mao

Affiliation Center for Bioinformatics, National Laboratory of Protein Engineering and Plant Genetic Engineering, College of Life Sciences, Peking University, Beijing, People's Republic of China

Liping Wei

To whom correspondence should be addressed. E-mail: weilp@mail.cbi.pku.edu.cn

Affiliation Center for Bioinformatics, National Laboratory of Protein Engineering and Plant Genetic Engineering, College of Life Sciences, Peking University, Beijing, People's Republic of China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

LW conceived and designed the experiments. CYL performed the experiments. CYL, XM, and LW analyzed the data. CYL and LW wrote the paper.