Center for Biological Sequence Analysis, Department of Biotechnology, The Technical University of Denmark, Lyngby, Denmark.|Center for Biological Sequence Analysis, Department of Biotechnology, The Technical University of Denmark, Lyngby, Denmark.|Center for Biological Sequence Analysis, Department of Biotechnology, The Technical University of Denmark, Lyngby, Denmark.|Center for Biological Sequence Analysis, Department of Biotechnology, The Technical University of Denmark, Lyngby, Denmark.