About the Authors

Pengfei Tian

Affiliation Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, United States of America

Robert B. Best

robertbe@helix.nih.gov

Affiliation Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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