1. Department of ChemistryUniversity of Cambridge Cambridge UK
2. Division of Molecular Biotechnology, Department of PhysicsChemistry and Biology, Linköping University Linköping Sweden
3. Department of BiochemistryUniversity of Cambridge Cambridge UK
4. Laboratory of Enzymology and Protein Folding, Centre of Protein EngineeringInstitute of Chemistry B6c, University of Lie'ge Lie'ge Belgium
5. Cambridge Institute for Medical Research Cambridge UK
6. Department of GeneticsUniversity of Cambridge Cambridge UK