About the Authors
Department of Genome Sciences, University of Washington, Seattle, Washington, United States of America
Department of Medicine, University of Washington, Seattle, Washington, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JAS MTM. Performed the experiments: MTM HW TK. Analyzed the data: MTM HW TK JAS. Contributed reagents/materials/analysis tools: MTM HW TK. Wrote the paper: MTM JAS.