1. Institute of Chemistry and Biochemistry, Freie Universität Berlin, 14195 Berlin, Germany
2. Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany
3. Wellcome Centre for Cell-Matrix Research, Manchester Academic Health Science Centre University of Manchester, M13 9PT Manchester, U.K.
4. Geoffrey Jefferson Brain Research Centre, Manchester Academic Health Science Centre, University of Manchester, M6 8FJ Manchester, U.K.
5. Center for Glycomics, Department of Cellular and Molecular Medicine, University of Copenhagen, Blegdamsvej 3, DK-2200 Copenhagen, DK