1. School of Biomedical Science, University of Leeds, Leeds, LS2 9JT, UK
2. Astbury Centre for Structural Molecular Biology, University of Leeds, LS2 9JT, UK
3. School of Molecular and Cellular Biology, University of Leeds, Leeds, LS2 9JT, UK
4. School of Electronic and Electrical Engineering, University of Leeds, LS2 9JT, UK
5. Leiden Institute of Chemistry, Leiden University, PO Box 9502, 2300 RA, Leiden, The Netherlands