About the Authors

Liujiao Bian

bianliujiao@sohu.com

Affiliation College of Life Science, Northwest University, Xi’an, Shaanxi, China

Xu Ji

Affiliation College of Life Science, Northwest University, Xi’an, Shaanxi, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: XJ LB. Performed the experiments: XJ LB. Analyzed the data: LB XJ. Wrote the paper: LB XJ. Proposed the theoretical frame: LB.