Practical Informatics and Bioinformatics Group, Department of Informatics, Ludwig-Maximilians-University Amalienstrasse 17, D-80333 Munich, Germany. jan.gewehr@bio.ifi.lmu.de|Practical Informatics and Bioinformatics Group, Department of Informatics, Ludwig-Maximilians-University Amalienstrasse 17, D-80333 Munich, Germany. jan.gewehr@bio.ifi.lmu.de