Center for Bioinformatics, Saarland University, 66041 Saarbrücken, Germany. dstoeckel@bioinf.uni-sb.de|Center for Bioinformatics, Saarland University, 66041 Saarbrücken, Germany. dstoeckel@bioinf.uni-sb.de|Center for Bioinformatics, Saarland University, 66041 Saarbrücken, Germany. dstoeckel@bioinf.uni-sb.de|Center for Bioinformatics, Saarland University, 66041 Saarbrücken, Germany. dstoeckel@bioinf.uni-sb.de|Center for Bioinformatics, Saarland University, 66041 Saarbrücken, Germany. dstoeckel@bioinf.uni-sb.de|Center for Bioinformatics, Saarland University, 66041 Saarbrücken, Germany. dstoeckel@bioinf.uni-sb.de|Center for Bioinformatics, Saarland University, 66041 Saarbrücken, Germany. dstoeckel@bioinf.uni-sb.de|Center for Bioinformatics, Saarland University, 66041 Saarbrücken, Germany. dstoeckel@bioinf.uni-sb.de|Center for Bioinformatics, Saarland University, 66041 Saarbrücken, Germany. dstoeckel@bioinf.uni-sb.de