About the Authors

Christopher E. Carr

chrisc@mit.edu

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

Jeremy McGee

Affiliation 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: CEC. Analyzed the data: CEC JM. Contributed reagents/materials/analysis tools: CEC. Wrote the paper: CEC JM.