About the Authors
Division of Humanities and Social Sciences, California Institute of Technology, Pasadena, California, United States of America
Division of Biology, California Institute of Technology, Pasadena, California, United States of America
The authors have declared that no competing interests exist.
HK, SS, and JPOD conceived and designed the experiments. HK performed the experiments. HK and JPOD analyzed the data. HK, SS, and JPOD contributed reagents/materials/analysis tools. HK and JPOD wrote the paper.