Department of Microbiology and Immunology, University of British Columbia, Vancouver, Canada V6T 1Z3, Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, Canada V6T 1Z4 and Wellcome Trust Sanger Institute, Hinxton CB10 1SA, UK.|Department of Microbiology and Immunology, University of British Columbia, Vancouver, Canada V6T 1Z3, Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, Canada V6T 1Z4 and Wellcome Trust Sanger Institute, Hinxton CB10 1SA, UK.|Department of Microbiology and Immunology, University of British Columbia, Vancouver, Canada V6T 1Z3, Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, Canada V6T 1Z4 and Wellcome Trust Sanger Institute, Hinxton CB10 1SA, UK.|Department of Microbiology and Immunology, University of British Columbia, Vancouver, Canada V6T 1Z3, Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, Canada V6T 1Z4 and Wellcome Trust Sanger Institute, Hinxton CB10 1SA, UK.|Department of Microbiology and Immunology, University of British Columbia, Vancouver, Canada V6T 1Z3, Centre for Microbial Diseases and Immunity Research, University of British Columbia, Vancouver, Canada V6T 1Z4 and Wellcome Trust Sanger Institute, Hinxton CB10 1SA, UK.