About the Authors

Lei Zhang

Affiliation Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America

Gang Ren

gren@lbl.gov

Affiliation Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: GR LZ. Performed the experiments: GR LZ. Analyzed the data: GR LZ. Contributed reagents/materials/analysis tools: GR LZ. Wrote the paper: GR LZ.