Bioinformatics Research Center (BiRC), University of Aarhus, Ny Munkegade, Building 540, DK-8000 Arhus C, Denmark. mailund@birc.dk|Bioinformatics Research Center (BiRC), University of Aarhus, Ny Munkegade, Building 540, DK-8000 Arhus C, Denmark. mailund@birc.dk