About the Authors
Laboratory of Genomic Integrity, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America
Departments of Biological Sciences and Chemistry, University of Southern California, Los Angeles, California, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JPM AV WK RW. Performed the experiments: JPM AV WK RW. Analyzed the data: JPM AV WK MFG RW. Contributed reagents/materials/analysis tools: JPM AV WK MFG RW. Wrote the paper: JPM AV WK MFG RW.