1. Department of Microbiology, Institute for Applied Biosciences; Karlsruhe Institute of Technology (KIT) - South Campus, Fritz-Haber-Weg 4; Karlsruhe D-76131 Germany
2. Department of Molecular Genetics; Ohio State University, 105 Biological Sciences Building, 484 W 12th Ave; Columbus OH 43210 USA
3. School of Life and Environmental Sciences; University of Tsukuba; Ten-Nou-Dai Tsukuba 305-8572 Japan