1. Biological and Soft Systems, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, U.K.
2. Department of Chemistry, University of Guelph, Guelph ON N1G 1Y4, Canada
3. School of Chemistry, University of New South Wales, Sydney, New South Wales 2052, Australia
4. Medical Research Council Laboratory of Molecular Biology, Cambridge Biomedical Campus, Cambridge CB2 0QH, U.K.
5. Fondazione Human Technopole, Structural Biology Research Centre, Milan 20157, Italy
6. Department of Chemistry and fabriCELL, Imperial College London, Molecular Sciences Research Hub, London W12 0BZ, U.K.
7. Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K.