1. Normandie Univ, UNIROUEN; Laboratoire Glycobiologie et Matrice Extracellulaire Végétale; Rouen 76000 France
2. Molecular Immunology Unit, Institute for Infection and Immunity; St. George's University of London Cranmer Terrace; London SW17 0RE UK
3. LOEWE Center for Synthetic Microbiology; Philipps-Universität Marburg; Marburg 35032 Germany
4. Department of Cell Biology; Philipps-Universität Marburg; Marburg 35032 Germany
5. Institut Universitaire de France (I.U.F.) 1; rue Descartes Paris Cedex 05 75231 France