Department of Bioinformatics, UKG, Georg-August-University of Goettingen Goldschmidtstrasse 1, 37077 Goettingen, Germany. tsa@bioinf.med.uni-goettingen.de|Department of Bioinformatics, UKG, Georg-August-University of Goettingen Goldschmidtstrasse 1, 37077 Goettingen, Germany. tsa@bioinf.med.uni-goettingen.de|Department of Bioinformatics, UKG, Georg-August-University of Goettingen Goldschmidtstrasse 1, 37077 Goettingen, Germany. tsa@bioinf.med.uni-goettingen.de