About the Authors

Susan E Ptak

Contributed equally to this work with: Susan E Ptak, Amy D Roeder

Affiliation Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany

Amy D Roeder

Contributed equally to this work with: Susan E Ptak, Amy D Roeder

address: Biodiversity and Ecological Processes Group, Cardiff School of Biosciences, Cardiff, United Kingdom

Affiliation Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany

Matthew Stephens

Affiliation Department of Statistics, University of Washington, Seattle, Washington, United States of America

Yoav Gilad

address: Department of Genetics, Yale University, New Haven, Connecticut, United States of America

Affiliation Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany

Svante Pääbo

Affiliation Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany

Molly Przeworski

To whom correspondence should be addressed. E-mail: Molly_Przeworski@ Brown.edu

address: Department of Ecology and Evolutionary Biology, Brown University, Providence, Rhode Island, United States of America

Affiliation Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany

Competing Interests

The authors have declared that no conflicts of interest exist.

Author Contributions

MP conceived and designed the experiments. ADR and YG performed the experiments. SEP, MS, and MP analyzed the data. MS, SP, and MP contributed reagents/materials/analysis tools. All authors contributed to the writing of the paper.