1. Sensory Biophysics Group, Department of Applied Physiology, University of Ulm, Albert–Einstein–Allee 11, 89081 Ulm, Germany
2. Hearing Research Centre, Division of Sensory Biophysics, Department of Otolaryngology, University of Tübingen, Elfriede–Aulhorn–Strasse 5, D–72076 Tübingen, Germany
3. Biological Microtribology Group, Biochemistry Department, MPI of Developmental Biology, Spemannstrasse 35, D–72076 Tübingen, Germany
4. Evolutionary Biomaterials Group, Max–Planck–Institute for Metals Research, Heisenbergstrasse 3, D–70569 Stuttgart, Germany