International NRW Graduate School in Bioinformatics and Genome Research, Bielefeld, Germany. bvoss@techfak.uni-bielefeld.de|International NRW Graduate School in Bioinformatics and Genome Research, Bielefeld, Germany. bvoss@techfak.uni-bielefeld.de|International NRW Graduate School in Bioinformatics and Genome Research, Bielefeld, Germany. bvoss@techfak.uni-bielefeld.de