1. Elettra Sincrotrone Trieste, SS 14 km 163, 5 in Area Science Park, 34149 Basovizza, Trieste, Italy
2. Centre de Biochimie Structurale, CNRS UMR 5048 - UM - INSERM U 1054, 29 rue de Navacelles 34090 Montpellier, France
3. Department of Chemistry, Ghent University, Krijgslaan 281, B-9000 Ghent, Belgium