1. Centre for Ancient Genetics, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark.
2. Center for Comparative Genomics and Bioinformatics, Pennsylvania State University, 310 Wartik Building, University Park, PA 16802, USA.
3. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 33 Leninsky Prospect, Moscow 119071, Russia.
4. Zoological Institute, Russian Academy of Sciences, Universitetskaya Naberezhnaya, St. Petersburg 199034, Russia.
5. Centro UCM-ISCIII de Evolución y Comportamiento Humanos, c/Sinesio Delgado 4, 28029 Madrid, Spain.