About the Authors

Daniel H. Janzen

djanzen@sas.upenn.edu

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

Winnie Hallwachs

Affiliation Department of Biology, 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: DHJ WH. Performed the experiments: DHJ WH. Analyzed the data: DHJ WH. Contributed reagents/materials/analysis tools: DHJ WH. Wrote the paper: DHJ WH.