Institute of Microbiology, Technical University Braunschweig, Germany.|Institute of Microbiology, Technical University Braunschweig, Germany.|Institute of Microbiology, Technical University Braunschweig, Germany.|Institute of Microbiology, Technical University Braunschweig, Germany.|Institute of Microbiology, Technical University Braunschweig, Germany.|Institute of Microbiology, Technical University Braunschweig, Germany.|Institute of Microbiology, Technical University Braunschweig, Germany.