About the Authors
Department of Ecology and Evolutionary Biology, Rice University, Houston, Texas, United States of America
Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, United States of America
The authors have declared that no competing interests exist.
EAO and MK conducted the experimental work. EAO, MK, GS, DCQ, and JES conceived of the study, discussed the results, and wrote the manuscript.