1. Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia.
2. Australian Research Council (ARC) Centre of Excellence in Structural and Functional Microbial Genomics, Monash University, Clayton, VIC 3800, Australia.
3. Division of Virology, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK.
4. Cancer Immunology Program, Peter MacCallum Cancer Centre, St. Andrew's Place, East Melbourne, VIC 3002, Australia.
5. Centre for Biomolecular Sciences, School of Pharmacy, University of Nottingham, Nottingham NG7 2RD, UK.