1. Laboratory of Biophysical ChemistryUniversity of Groningen Nijenborgh 7 9747 AG Groningen The Netherlands
2. Structural Biology GroupEuropean Synchrotron Radiation Facility 71 Avenue des Martyrs 38000 Grenoble France
3. Wageningen Food & Biobased Research Bornse Weilanden 9 6708 WG Wageningen The Netherlands