1. Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
2. Centre de Biochimie Structurale, CNRS UMR5048, INSERM U1054, Université Montpellier, 34000 Montpellier, France
3. Department of Microbial and Molecular Systems, Laboratory of Food Microbiology, KU Leuven, B-3001 Leuven, Belgium