1. Department of New Materials and Biosystems, Max Planck Institute for Metals Research, and Department of Biophysical Chemistry, University of Heidelberg, Heisenbergstr. 3, D-70569 Stuttgart, Germany, Center of Integrated Protein Science Munich at the Technical University of Munich, Department Chemie, Technical University of Munich, Lichtenbergstrasse 4, D-85747 Garching, Germany, Central Unit for Electron Microscopy, University of Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany, Department of...