1. Department of Molecular Genetics and Infection Biology, Center for Functional Genomics of Microbes, University of Greifswald, D-17487 Greifswald, Germany
2. Central Facility for Microscopy, Helmholtz-Center for Infection Research, D-38124 Braunschweig, Germany
3. Institute for Biochemistry, Medical School, Justus-Liebig-University, D-35392 Giessen, Germany