1. Unité des Interactions Bactéries-Cellules, Institut Pasteur, 75724 Paris Cedex 15
2. INSERM U-570, CHU Necker-Enfants Malades, 75730 Paris Cedex 15, France
3. Departamento de Biotecnologia Microbiana, Centro Nacional de Biotecnologia-CSIC, Campus de Cantoblanco, 28049, Madrid. Spain
4. Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019