Department of Systems Biology, Center for Biological Sequence Analysis, Technical University of Denmark, Building 208, Kongens Lyngby, DK-2800, Denmark. rask@cbs.dtu.dk.|Department of Systems Biology, Center for Biological Sequence Analysis, Technical University of Denmark, Building 208, Kongens Lyngby, DK-2800, Denmark.|Division of Medical Parasitology, Department of Microbiology, New York University Langone Medical Center, 341 East 25th Street, New York, NY, 10010, USA.|Division of Medical Parasitology, Department of Microbiology, New York University Langone Medical Center, 341 East 25th Street, New York, NY, 10010, USA.|Department of Systems Biology, Center for Biological Sequence Analysis, Technical University of Denmark, Building 208, Kongens Lyngby, DK-2800, Denmark.