1. United States Department of Energy Joint Genome Institute, Walnut Creek, CA 94598, USA.
2. Genomics Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
3. Max Planck Institute for Evolutionary Anthropology, Leipzig, D-04103, Germany.
4. Institute of Paleontology, University of Vienna, Vienna, A-1010 Austria.
5. Biosciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.