1. Department of BiochemistryGroningen Biomolecular Sciences andBiotechnology Institute and Zernike Institute for Advanced MaterialsUniversity of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
2. Department of Biomolecular Chemistry and CatalysisStratingh Institute for ChemistryUniversity of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
3. DWI Leibniz Institute for Interactive Materials Forckenbeckstrasse 50 52074 Aachen Germany