1 Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Melbourne, Victoria, Australia.
2 Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Australia. jamie.rossjohn@monash.edu.
3 Institute of Infection and Immunity, Cardiff University, School of Medicine, Cardiff, UK. jamie.rossjohn@monash.edu.