1. Max Planck Institute of Colloids and Interfaces, 14424, Potsdam, Germany, Institute of Transfusion Medicine, Charité-Univeristätsmedizin Berlin, 10098, Berlin, Germany, Research group Nanotechnology for Life Science, Fraunhofer Institute for Applied Polymer Research, 14476, Potsdam, Germany, and Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QT, U.K.