About the Authors
Lewis-Sigler Institute for Integrative Genomics and Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey, United States of America
Molecular and Cellular Biology Program, University of Washington, Seattle, Washington, United States of America
The authors have declared that no competing interests exist.
ENS conceived and designed the experiments, performed the experiments, analyzed the data, and wrote the paper. LK conceived and designed the experiments and wrote the paper.