1 Centre for Palaeogenetics, Svante Arrhenius väg 20C, SE-10691, Stockholm, Sweden; Department of Bioinformatics and Genetics, Swedish Museum of Natural History, Box 50007, SE-10405, Stockholm, Sweden; Department of Zoology, Stockholm University, SE-10691 Stockholm, Sweden. Electronic address: nicolas.dussex@gmail.com.
2 Department of Zoology, University of Otago, PO Box 56, Dunedin 9054, New Zealand.
3 Centre for Palaeogenetics, Svante Arrhenius väg 20C, SE-10691, Stockholm, Sweden; Department of Bioinformatics and Genetics, Swedish Museum of Natural History, Box 50007, SE-10405, Stockholm, Sweden; Department of Zoology, Stockholm University, SE-10691 Stockholm, Sweden.
4 Vertebrate Genome Laboratory, The Rockefeller University, New York, NY 10065, USA; Laboratory of Neurogenetics of Language, Box 54, The Rockefeller University, New York, NY 10065, USA; Howard Hughes Medical Institute, Chevy Chase, MD, 20815, USA. Electronic address: ejarvis@rockefeller.edu.