About the Authors

Victor Hanson-Smith

victor.hanson-smith@ucsf.edu

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

Alexander Johnson

Affiliation Department of Microbiology and Immunology, 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: VHS. Performed the experiments: VHS. Analyzed the data: VHS. Wrote the paper: VHS AJ.