About the Authors

Xiaoqiang Wang

Affiliation Center for Bioengineering and Biotechnology, China University of Petroleum (East China), Qingdao, Shandong, China

Shuguang Zhang


Affiliation Laboratory for Molecular Fabrication, Center for Bits and Atoms, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: XW SZ. Performed the experiments: XW. Analyzed the data: XW SZ. Wrote the paper: XW SZ.