1. Biochemistry and Structural Biology, Lund University, Lund 221 00, Sweden
2. Centre for Misfolding Diseases Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
3. Department of Applied Physics, Biophysics Group, SciLifeLab, Royal Institute of Technology-KTH, Solna 171 65, Sweden
4. Cavendish Laboratory, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, U.K.