1. NMR Spectroscopy, Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
2. Group for Nano- and Biotechnological applications, Department of Fundamentals of Electrical Engineering, Mathematics and Physics, University of Ljubljana, Tržaška cesta 25, 1000 Ljubljana, Slovenia
3. Macromolecular Biochemistry, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands