Institute of Microbiology, Technical University of Braunschweig, Spielmannstr. 7 D-38106 Braunschweig, Germany.|Institute of Microbiology, Technical University of Braunschweig, Spielmannstr. 7 D-38106 Braunschweig, Germany.|Institute of Microbiology, Technical University of Braunschweig, Spielmannstr. 7 D-38106 Braunschweig, Germany.|Institute of Microbiology, Technical University of Braunschweig, Spielmannstr. 7 D-38106 Braunschweig, Germany.|Institute of Microbiology, Technical University of Braunschweig, Spielmannstr. 7 D-38106 Braunschweig, Germany.|Institute of Microbiology, Technical University of Braunschweig, Spielmannstr. 7 D-38106 Braunschweig, Germany.|Institute of Microbiology, Technical University of Braunschweig, Spielmannstr. 7 D-38106 Braunschweig, Germany.