About the Authors
Department of Biology, University of Iowa, Iowa City, Iowa, United States of America
Interdisciplinary Program in Genetics, University of Iowa, Iowa City, Iowa, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JMC. Performed the experiments: RR SB. Analyzed the data: JMC. Contributed reagents/materials/analysis tools: JMC. Wrote the paper: JMC.