About the Authors
Department of Biological Sciences, Wellesley College, Wellesley, Massachusetts, United States of America
Department of Biology, Northeastern University, Boston, Massachusetts, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: KK KL WAS YS. Performed the experiments: KK KL AB WAS YS. Analyzed the data: KK KL WAS YS. Contributed reagents/materials/analysis tools: WAS YS. Wrote the paper: KK WAS YS.