About the Authors

Susannah L. McKay

Current address: Department of Molecular and Cell Biology, University of California, Berkeley, California, United States of America

Affiliation Molecular Biology Section, Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America

Tracy L. Johnson

johnsont@ucsd.edu

Affiliation Molecular Biology Section, Division of Biological Sciences, University of California San Diego, La Jolla, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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