1 Department Molecular Biology, Max-Planck-Institute for Developmental Biology, 72076 Tuebingen, Germany;
2 Research Group for Ancient Genomics and Evolution, Department of Molecular Biology, Max-Planck-Institute for Developmental Biology, 72076 Tuebingen, Germany;
3 Center for Computational and Theoretical Biology, University of Würzburg, 97074 Wuerzburg, Germany; Department for Bioinformatics, Biozentrum, University of Würzburg, 97074 Wuerzburg, Germany.
4 Center for Computational and Theoretical Biology, University of Würzburg, 97074 Wuerzburg, Germany; Department for Bioinformatics, Biozentrum, University of Würzburg, 97074 Wuerzburg, Germany frank.foerster@uni-wuerzburg.de.