1. Oxford
Glycobiology Institute, Department of Biochemistry, University of Oxford, Oxford, OX1 3QU, United Kingdom
2. Free University Berlin, Department of Chemistry
and Biochemistry, Takustrasse
3, 14195 Berlin, Germany
3. Department
of Immunology and Microbial Science, The Scripps Research Institute, La
Jolla, California 92037, United States