1. Max-Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany
2. Department of Theoretical and Computational Biophysics, Max-Planck-Institute of Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany
3. Department of Cell and Molecular Biology, Uppsala University, Husargatan 3, Box 596, SE-75124 Uppsala, Sweden
4. Stockholm Center for Biomembrane Research, Stockholm University, SE-10691 Stockholm, Sweden