1. Oxford Protein Production Facility, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, UK
2. Division of Structural Biology, The Henry Wellcome Building for Genomic Medicine, Oxford University, Roosevelt Drive, Oxford OX3 7BN, UK
3. Department of Virology, Telethon Institute for Child Health Research, University of Western Australia, Perth, WA 6008, Australia
4. INRA, UMR1157, Virologie Moléculaire et Structurale, 91198 Gif sur Yvette, France
5. CNRS, UMR2472, IFR 115, Virologie Moléculaire et Structurale, 91198 Gif sur Yvette, France