About the Authors

Ervin L. Johnson III

Affiliation Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, California, United States of America

Richard D. Fetter

Address Current address: Howard Hughes Medical Institute, Janelia Farm Research Campus, Ashburn, Virginia, United States of America

Affiliation Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, California, United States of America

Graeme W. Davis

gdavis@biochem.ucsf.edu

Affiliation Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

The author(s) have made the following declarations about their contributions: Conceived and designed the experiments: ELJ GWD. Performed the experiments: ELJ RDF. Analyzed the data: ELJ RDF. Contributed reagents/materials/analysis tools: ELJ. Wrote the paper: ELJ GWD.