About the Authors

Huizhong Feng

Affiliation Department of Biological Sciences, Columbia University, New York, New York, United States of America

Brent R. Stockwell

bstockwell@columbia.edu

Affiliations Department of Biological Sciences, Columbia University, New York, New York, United States of America, Department of Chemistry, Columbia University, New York, New York, United States of America

Competing Interests

The authors have declared that no competing interests exist.