1. Department for Biosystems Science and Engineering (D-BSSE); Eidgenössische Technische Hochschule (ETH) Zurich; 4058 Basel Switzerland
2. Howard Hughes Medical Institute; Janelia Research Campus; Ashburn VA 20147 USA
3. Institute of Applied Physics; Karlsruhe Institute of Technology (KIT); 76131 Karlsruhe Germany
4. Institute of Toxicology and Genetics; Karlsruhe Institute of Technology (KIT); 76344 Eggenstein-Leopoldshafen Germany
5. Institute of Nanotechnology; Karlsruhe Institute of Technology (KIT); 76344 Eggenstein-Leopoldshafen Germany
6. Department of Physics; University of Illinois at Urbana-Champaign; Urbana IL 61801 USA