Department of Bioinformatics, Heinrich-Heine-University Duesseldorf, Universitaetsstrasse 1, Duesseldorf 40225, Germany. laubach@cs.uni-duesseldorf.de|Department of Bioinformatics, Heinrich-Heine-University Duesseldorf, Universitaetsstrasse 1, Duesseldorf 40225, Germany. laubach@cs.uni-duesseldorf.de|Department of Bioinformatics, Heinrich-Heine-University Duesseldorf, Universitaetsstrasse 1, Duesseldorf 40225, Germany. laubach@cs.uni-duesseldorf.de