1. Faculty of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-University, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
2. Department of Cancer Biology, Dana-Farber Cancer Institute; Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, United States
3. Department of Physics, University of Oxford, Clarendon Laboratory, Oxford OX1 3PU, United Kingdom
4. The Kavli Institute for Nanoscience Discovery, University of Oxford, New Biochemistry Building, Oxford OX1 3PU, United Kingdom
5. Science for Life Laboratory, Department of Gene Technology, KTH Royal Institute of Technology, Stockholm 171 65, Sweden