1. NMR Spectroscopy Bijvoet Center for Biomolecular Research Utrecht University Padualaan 8 3584 CH Utrecht The Netherlands
2. MOE Key Lab for Cellular Dynamics School of Life Sciences University of Science and Technology of China 96 Jinzhai Road Hefei 230026 Anhui China
3. Current address: Department of Bionanoscience Kavli Institute of Nanoscience Delft University of Technology Van der Maasweg 9 2629 H. Z. Delft The Netherlands