1. Medical Research Council Centre for Molecular Bacteriology and Infection, Imperial College London, SW7 2AZ London, United Kingdom
2. Glycosciences Laboratory, Department of Metabolism, Digestion and Reproduction, Imperial College London, W12 0NN London, United Kingdom
3. Laboratoire de Chimie Bactérienne, CNRS/Aix-Marseille Université (Unité Mixte de Recherche 7283), Institut de Microbiologie de la Méditerranée, 13009 Marseille, France