About the Authors
Department of Biology, Washington University in St. Louis, St. Louis, Missouri, United States of America
Laboratory of Biochemistry and Molecular Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: NSH RK DKC PAL. Performed the experiments: NSH RK. Analyzed the data: NSH RK DKC PAL. Contributed reagents/materials/analysis tools: NSH RK DKC PAL. Wrote the paper: NSH RK DKC PAL.