1. Department of Biology, Chemistry, and Pharmacy, Freie Universität Berlin, Berlin 14195, Germany
2. Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin, Germany
3. Department of Cellular and Molecular Medicine, University of Copenhagen, Copenhagen Center for Glycomics, Copenhagen N 2200, Denmark
4. Bijvoet Center for Biomolecular Research, Utrecht University, 3584 CG Utrecht, The Netherlands
5. Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602-0002, United States