1. Mathematical, Computer and Natural Sciences Department, Athens State University, Athens, AL 35611, USA
2. Microbiology Department, University of Georgia in Athens, Athens, GA 30602, USA
3. Biology Department, University of Alabama in Huntsville, Huntsville, AL 35899, USA
4. Present address: Genome Sequencing Center, HudsonAlpha Institute for Biotechnology, Huntsville, AL 35806, USA.
5. Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK 73019, USA
6. Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA
7. Institut für Mikrobiologie, Veterinärmedizinische Universität Wien, A-1210 Wien, Austria