1. Department of Biological Sciences, Birkbeck, University of London, London, United Kingdom;
2. The Francis Crick Institute, Mill Hill Laboratory, London, United Kingdom;
3. Department of Biochemistry, University of Oxford, Oxford, United Kingdom;
4. Centre for Ultrastructural Imaging, Kings College, London, United Kingdom; and
5. Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom