1. Chromatin Structure and Mobile DNA Laboratory, Francis Crick Institute, London NW1 1AT, UK.
2. Department of Cancer Immunology and Virology, Dana-Farber Cancer Institute, Boston, MA 02215, USA.
3. Department of Medicine, Harvard Medical School, Boston, MA 02115, USA.
4. Department of Chemistry, King’s College London, London SE1 1DB, UK.
5. Structural Biology Science Technology Platform, Francis Crick Institute, London NW1 1AT, UK.
6. The Wellcome Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, UK.
7. Materials and Structural Analysis, Thermo Fisher Scientific, Eindhoven, 5651 GG, Netherlands.
8. Department of Infectious Disease, Imperial College London, St Mary’s Campus, London W2 1PG, UK.