Center for Biological Sequence Analysis, Technical University of Denmark DK-2800 Lyngby, Denmark.|Center for Biological Sequence Analysis, Technical University of Denmark DK-2800 Lyngby, Denmark.|Center for Biological Sequence Analysis, Technical University of Denmark DK-2800 Lyngby, Denmark.|Center for Biological Sequence Analysis, Technical University of Denmark DK-2800 Lyngby, Denmark.|Center for Biological Sequence Analysis, Technical University of Denmark DK-2800 Lyngby, Denmark.|Center for Biological Sequence Analysis, Technical University of Denmark DK-2800 Lyngby, Denmark.