About the Authors
Department of Molecular and Cell Biology, University of California, Berkeley, California, United States of America
Max-Planck-Institute for Evolutionary Anthropology, Leipzig, Germany
Society of Fellows, Harvard University, Cambridge, Massachusetts, United States of America
Genome Sciences Department, Genomics Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
The authors have declared that no competing interests exist.
HBF, PK, and JBP conceived and designed the experiments and analyses. PK performed the experiments. HBF analyzed the data. SP and MBE contributed reagents/materials/analysis tools. HBF, PK, JBP, SP, and MBE wrote the paper.