Center for Biological Sequence Analysis BioCentrum-DTU, Technical University of Denmark DK-2800 Lyngby. lars@cbs.dtu.dk|Center for Biological Sequence Analysis BioCentrum-DTU, Technical University of Denmark DK-2800 Lyngby. lars@cbs.dtu.dk|Center for Biological Sequence Analysis BioCentrum-DTU, Technical University of Denmark DK-2800 Lyngby. lars@cbs.dtu.dk|Center for Biological Sequence Analysis BioCentrum-DTU, Technical University of Denmark DK-2800 Lyngby. lars@cbs.dtu.dk