About the Authors
Laboratory of Molecular Genetics, National Institute of Environmental Health Sciences (NIEHS), National Institutes of Health (NIH), Research Triangle Park, North Carolina, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: SC JWW DAG MAR. Performed the experiments: SC JWW. Analyzed the data: SC JWW DAG MAR. Contributed reagents/materials/analysis tools: SC JWW. Wrote the paper: SC DAG MAR.