About the Authors
Chromosome Stability Section, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, United States of America
Biology Department, Indiana University–Purdue University, Indianapolis, Indiana, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JW WM AM MAR. Performed the experiments: JW WM YY KVH AM. Analyzed the data: JW WM AM MAR. Wrote the paper: MAR.