1. Institute for Macromolecular Chemistry; BIOSS Centre for Biological Signaling Studies; University of Freiburg; 79104 Freiburg Germany
2. Helmholtz Virtual Institute; Multifunctional Biomaterials for Medicine; Kantstr. 55 14513 Teltow Germany
3. Institute of Pharmaceutical Sciences; University of Freiburg; 79104 Freiburg Germany
4. Institute for Macromolecular Chemistry; University of Freiburg; 79104 Freiburg Germany
5. BIOSS Toolbox; Centre for Biological Signaling Studies; University of Freiburg; 79104 Freiburg Germany
6. Max Planck Institute of Colloids and Interfaces; Department of Biomaterials; Science Park Golm 14424 Potsdam Germany
7. Department of Civil and Environmental Engineering; Massachusetts Institute of Technology; Cambridge MA 02149 USA