1. Institute of Biophysics of the Czech Academy of Sciences, Královopolská 135, Brno 621 00, Czech Republic
2. Faculty of Chemistry, Brno University of Technology, Purkyňova 118, Brno 61200, Czech Republic
3. Laboratoire d’Optique et Biosciences, Ecole Polytechnique, CNRS, INSERM, Institut Polytechnique de Paris, Palaiseau 91120, France