1. Department of Biology, Functional Biology Laboratory, KU Leuven, 3001 Heverlee, Belgium
2. Department of Biology, Microbial Systems Cell Biology Laboratory, KU Leuven, 3001 Heverlee, Belgium
3. Department of Biology/Chemistry, Cellular Communication Laboratory, Osnabrück University, 49076 Osnabrück, Germany
4. Center of Cellular Nanoanalytics Osnabrück, 49076 Osnabrück, Germany