1. Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
2. Graduate School of Genome Science and Technology, University of Tennessee, Knoxville, Tennessee, USA
3. Lehrstuhl fur Mikrobiologie und Archaeenzentrum, Universitaet Regensburg, Regensburg, Germany
4. Institute for Microbiology and Molecular Biology, University of Hohenheim, Stuttgart, Germany