1. Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA.
2. Molecular Microscopy Research Group, Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, Netherlands.
3. Physical and Synthetic Biology, Faculty of Biology, Ludwig-Maximilians-Universität München, 82152 Planegg-Martinsried, Germany.
4. Department of Physiology, University of California, Los Angeles, CA 90095, USA.
5. California NanoSystems Institute, University of California, Los Angeles, CA 90095, USA.