1. FG11 Division of Enteropathogenic Bacteria and Legionella; Robert Koch Institute; Burgstrasse 37 38855 Wernigerode Germany
2. ZBS 4 - Advanced Light and Electron Microscopy; Robert Koch Institute; Nordufer 20 13353 Berlin Germany
3. Institute for Cell and Molecular Biosciences; The Centre for Bacterial Cell Biology; Newcastle University; Newcastle upon Tyne NE2 4AX UK
4. Institute for Cell and Molecular Biosciences; Pinnacle Laboratory; Newcastle University; Newcastle upon Tyne NE2 4HH UK