About the Authors
Department of Biology, Emory University, Atlanta, Georgia, United States of America
Program of Biostatistics and Biomathematics, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
Department of Biostatistics and School of Public Health and Community Medicine, University of Washington, Seattle, Washington, United States of America
The authors have declared that no competing interests exist.
All authors conceived and designed the experiments and wrote the paper. AH performed the experiments and analyzed the data.