1. Institute of Structural and Molecular Biology, Birkbeck, University of London, Malet St, London WC1E 7HX, UK.
2. Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, UK.
3. Scientific Computing Department, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Fermi Ave, Harwell, Didcot OX11 0QX, UK.
4. Centre for Structural Systems Biology, Leibniz-Institut für Experimentelle Virologie and Universitätsklinikum Hamburg-Eppendorf (UKE), Hamburg, Germany.
5. Peter MacCallum Cancer Centre, 305 Grattan St, Melbourne, VIC 3000, Australia.