About the Authors

Shannon L Stroschein-Stevenson

Affiliation Department of Microbiology and Immunology, University of California, San Francisco, California, United States of America

Edan Foley

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

Patrick H O'Farrell

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

Alexander D Johnson

To whom correspondence should be addressed. E-mail: ajohnson@cgl.ucsf.edu

Affiliations Department of Microbiology and Immunology, University of California, San Francisco, California, United States of America, Department of Biochemistry and Biophysics, University of California, San Francisco, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

SLS and EF conceived, designed, and performed the experiments. SLS, EF, PHO, and ADJ analyzed the data and wrote the paper.