About the Authors

David R Halpin

Affiliation Department of Biochemistry, Stanford University School of Medicine, Stanford, California, United States of America

Pehr B Harbury

To whom correspondence should be addressed. E-mail: harbury@cmgm.stanford.edu

Affiliation Department of Biochemistry, Stanford University School of Medicine, Stanford, California, United States of America

Competing Interests

The authors have declared that no conflicts of interest exist.

Author Contributions

DRH and PBH conceived and designed the experiments. DRH performed the experiments. DRH and PBH analyzed the data and wrote the paper.