About the Authors

Matthew C. Dulik

Affiliation Department of Anthropology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America

Ludmila P. Osipova

Affiliation Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences (SB RAS), Novosibirsk, Russia

Theodore G. Schurr

tgschurr@sas.upenn.edu

Affiliation Department of Anthropology, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America

Competing Interests

TS' lab has received funding from a commercial source (National Geographic Society) that provides infrastructural support for this and other projects. However, this support does alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: MCD LPO TGS. Performed the experiments: MD. Analyzed the data: TS MD. Contributed reagents/materials/analysis tools: LPO TGS. Wrote the paper: MCD TGS.