Department of Computational Molecular Biology, Max Planck Institute for Molecular Genetics, Ihnestrasse 73, D-14195 Berlin, Germany. Sven.Rahmann@cebitec.uni-bielefeld.de|Department of Computational Molecular Biology, Max Planck Institute for Molecular Genetics, Ihnestrasse 73, D-14195 Berlin, Germany. Sven.Rahmann@cebitec.uni-bielefeld.de