About the Authors
Department of Biological Statistics and Computational Biology, Cornell University, Ithaca, New York, United States of America
Institute of Biology, University of Copenhagen, Copenhagen, Denmark
Department of Human Genetics, University of Chicago, Chicago, Illinois, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: CK TV CDB RN AS. Performed the experiments: CK TV AS. Analyzed the data: CK TV RRdF RN AS. Contributed reagents/materials/analysis tools: CK TV MJH RN AS. Wrote the paper: CK TV AS.