Centre for Bioinformatics, University of Hamburg, Bundesstr. 43, D-20146 Hamburg, Germany. tim.wiegels@gmail.com|Centre for Bioinformatics, University of Hamburg, Bundesstr. 43, D-20146 Hamburg, Germany. tim.wiegels@gmail.com|Centre for Bioinformatics, University of Hamburg, Bundesstr. 43, D-20146 Hamburg, Germany. tim.wiegels@gmail.com