1. Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems, Heisenbergstrasse 3, 70569 Stuttgart, Germany
2. Department of Biophysical Chemistry, University of Heidelberg, Germany
3. Zoological Institute, University of Kiel, Germany
4. Institute for Organic Chemistry und Biochemistry, Lehrstuhl II, Technical University of Munich, Lichtenbergstrasse 4, 85747 Garching, Germany