About the Authors

Sarah E. Clark

Affiliation Department of Microbiology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America

Julian Snow

Affiliation Department of Chemistry and Biochemistry, University of the Sciences, Philadelphia, Pennsylvania, United States of America

Jianjun Li

Affiliation Institute for Biological Sciences, National Research Council Canada, Ottawa, Ontario, Canada

Tracey A. Zola

Affiliation Department of Microbiology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America

Jeffrey N. Weiser

weiser@mail.med.upenn.edu

Affiliation Department of Microbiology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SEC JS TAZ JNW. Performed the experiments: SEC JL. Analyzed the data: SEC JS JL JNW. Contributed reagents/materials/analysis tools: JNW. Wrote the paper: SEC JNW.