1. Institute of Pharmacy and Molecular Biotechnology, Heidelberg University, Im Neuenheimer Feld 364, 69120 Heidelberg, Germany
2. Institute of Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany
3. Centre of Membrane Proteins and Receptors (COMPARE), Universities of Birmingham and Nottingham, Edgbaston, B15 2TT Birmingham, U.K.
4. College of Medical and Dental Sciences, Medical School & School of Chemistry, University of Birmingham, Edgbaston, B15 2TT Birmingham, U.K.
5. Faculty of Biosciences, Heidelberg University, Im Neuenheimer Feld 234, 69120 Heidelberg, Germany
6. Laboratory of Nanoscale Biology, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
7. Delft University of Technology, Kavli Institute of Nanoscience, Department of Bionanoscience, Van der Maasweg 9, 2629 HZ Delft, The Netherlands
8. Biocenter Mainz, Departments of Biology and Chemistry, Johannes Gutenberg University, Hanns-Dieter-Hüsch-Weg 17, 55128 Mainz, Germany
9. Institute of Molecular Biology, Ackermannweg 4, 55128 Mainz, Germany
10. Structural and Computational Biology Unit, Cell Biology and Biophysics Unit, EMBL, Meyerhofstraße 1, 69117 Heidelberg, Germany
11. National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Building 2A, Yikuang Str.2, Harbin 150080, China
12. Department of Chemical Biology, Max Planck Institute for Medical Research, Jahnstraße 29, 69120 Heidelberg, Germany
13. Fluorescence Research Group, Singapore University of Technology and Design, 8 Somapah Road, 487372 Singapore
14. Institute of Organic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany