1. Max Planck Institute for Evolutionary Anthropology, D-04103 Leipzig, Germany.
2. Watson School of Biological Sciences, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.
3. Howard Hughes Medical Institute, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.
4. Division of Biological Sciences, University of Montana, Missoula, MT 59812, USA.
5. Department of Biology, Emory University, Atlanta, GA 30322, USA.
6. Agilent Technologies, Life Sciences Group, Santa Clara, CA 95051, USA.
7. Área de Prehistoria, Departamento de Historia, Universidad de Oviedo, Oviedo, Spain.
8. Departamento de Paleobiología, Museo Nacional de Ciencias Naturales, Consejo Superior de Investigaciones Científicas, Madrid, Spain.