1. Mechano(bio)chemistry Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
2. ARC Centre of Excellence for Innovations in Peptide and Protein Science Institute for Molecular Bioscience The University of Queensland Brisbane Qld 4072 Australia
3. Department of Theory and Bio-Systems Max Planck Institute of Colloids and Interfaces Am Mühlenberg 1 14476 Potsdam Germany
4. Present address: Berlin Institute for Medical Systems Biology Max Delbrück Center for Molecular Medicine 10115 Berlin Germany