About the Authors
Institute for Genome Sciences and Policy, Duke University, Durham, North Carolina, United States of America
University of Washington, Seattle, Washington, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: IPM DLM UO. Performed the experiments: IPM. Analyzed the data: IPM UO. Contributed reagents/materials/analysis tools: DLM. Wrote the paper: IPM UO.