About the Authors
Laboratory of Molecular Genetics, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: YY FS MAR DAG. Performed the experiments: YY JS DAG. Analyzed the data: YY JS FS MAR DAG. Contributed reagents/materials/analysis tools: YY JS FS. Wrote the paper: YY MAR DAG. Conceived the idea: DAG.