1Institute for the Physics of Living Systems, University College London, Gower St, London, WC1E 6BT, UK
2Department of Structural and Molecular Biology, University College London, Gower St, London, WC1E 6BT, UK
4London Centre for Nanotechnology, University College London, Gower St, London, WC1E 6BT, UK
5The Alan Turing Institute, Euston Rd, London NW1 2DB, UK