About the Authors

David J. Casso

Current address: Department of Cell and Tissue Biology, University of California San Francisco, San Francisco, California, United States of America

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

Songmei Liu

Affiliation Cardiovascular Research Institute, University of California San Francisco, San Francisco, California, United States of America

Brian Biehs

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

Thomas B. Kornberg

tkornberg@ucsf.edu

Affiliations Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, California, United States of America, Cardiovascular Research Institute, 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

Conceived and designed the experiments: DJC BB TBK. Performed the experiments: DJC SL BB. Analyzed the data: DJC SL BB TBK. Contributed reagents/materials/analysis tools: DJC SL BB. Wrote the paper: DJC TBK.