1. Biosurfaces Unit, Centre for Cooperative Research in Biomaterials Paseo Miramon 182 Donostia—San Sebastian 20009 Spain
2. Department of Cellular Logistics, Max Planck Institute for Biophysical Chemistry Am Fassberg 11 Göttingen 37077 Germany
3. Department of Biology, University of Osnabrück Barbarastrasse 11 Osnabrück 49076 Germany
4. Max Planck Institute for Metals Research Heisenbergstrasse 3 Stuttgart 70569 Germany