1. Department of Biology; Molecular Biophysics; Humboldt University; 10115 Berlin Germany
2. Laboratory of Membrane Biology; Department of Integrative Biology and Pharmacology; The University of Texas; 6431 Fannin Street Houston Texas 77030 USA
3. PicoQuant GmbH; 12489 Berlin Germany
4. Department of Immunology and Molecular Biology; Free University; 14163 Berlin Germany