1. Oxford Glycobiology Institute, Department of Biochemistry; University of Oxford; South Parks Road Oxford OX1 3QU UK
2. Department of Biological Sciences; University of Warwick; Coventry CV47AL UK
3. Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology; University of Leeds; Leeds LS2 9JT UK
4. Chemistry Research Laboratory; 12 Mansfield Road Oxford OX1 3TA UK
5. Institute of Chemistry and Biochemistry; Freie Universität Berlin; Takustrasse. 3 14159 Berlin Germany
6. Fritz Haber Institute of the Max Planck Society; Faradayweg 4-6 14195 Berlin Germany
7. Institute of Structural and Molecular Biology, Division of Biosciences; University College London; London WC1E 6BT UK
8. Institute of Structural and Molecular Biology, Department of Biological Sciences, Birkbeck College; University of London; London UK