International NRW Graduate School in Bioinformatics and Genome Research, Center for Biotechnology (CeBiTec), Bielefeld University, Bielefeld, Germany. rhomann@techfak.uni-bielefeld.de|International NRW Graduate School in Bioinformatics and Genome Research, Center for Biotechnology (CeBiTec), Bielefeld University, Bielefeld, Germany. rhomann@techfak.uni-bielefeld.de|International NRW Graduate School in Bioinformatics and Genome Research, Center for Biotechnology (CeBiTec), Bielefeld University, Bielefeld, Germany. rhomann@techfak.uni-bielefeld.de|International NRW Graduate School in Bioinformatics and Genome Research, Center for Biotechnology (CeBiTec), Bielefeld University, Bielefeld, Germany. rhomann@techfak.uni-bielefeld.de