1. Institut Européen de Chimie et Biologie, Université de Bordeaux, 2 rue Robert Escarpit, 33607 Pessac, France
2. Institut des Sciences Moléculaires, CNRS UMR5255, 33405 Talence, France
3. Institut de Biochimie et Génétique Cellulaires, CNRS UMR5095, 33077 Bordeaux, France
4. Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602, United States
5. Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602, United States