1. Department of Microbial Genetics, Interfaculty Institute of Microbiology and Infection Medicine Tübingen (IMIT), Faculty of Science, University of Tübingen, Waldhäuser Str. 70/8, 72076 Tübingen, Germany
2. Department of Microbiology and Immunology, University of Arkansas for Medical Sciences, 4301 W. Markham Street, Slot 511, Little Rock, AR 72205, USA