About the Authors

Fan Xiu Zhu

Affiliation Department of Biological Science, Florida State University, Tallahassee, Florida, United States of America

Narayanan Sathish

Affiliation Department of Microbiology, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America

Yan Yuan

yuan2@pobox.upenn.edu

Affiliation Department of Microbiology, School of Dental Medicine, 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: FXZ YY. Performed the experiments: FXZ NS. Analyzed the data: FXZ NS YY. Wrote the paper: FXZ NS YY.