About the Authors

Sara O. Dean

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

James A. Spudich

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

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

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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