About the Authors

Janet L. Smith

Affiliation Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America

Alan D. Grossman

adg@mit.edu

Affiliation Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JLS ADG. Performed the experiments: JLS. Analyzed the data: JLS ADG. Contributed reagents/materials/analysis tools: JLS. Wrote the paper: JLS ADG.