1. York Structural Biology Laboratory, University of York York YO10 5YW UK
2. National Institute for Medical Research, The Ridgeway, Mill Hill London NW7 1AA UK
3. Institute of Molecular and Cell Biology, (A*STAR) Agency for Science, Technology and Research 61 Biopolis Drive Proteos 138673 Singapore
4. Bioinformatics Institute, (A*STAR) Agency for Science, Technology and Research 30 Biopolis Way, #071‐01 Matrix 138671 Singapore