1. Laboratory of Biophysical Chemistry; University of Groningen; Nijenborgh 7 9747 AG Groningen The Netherlands
2. ESRF-The European Synchrotron; 71 Avenue des Martyrs 38000 Grenoble France
3. Wageningen Food & Biobased Research; Bornse Weilanden 9 6708 WG Wageningen The Netherlands