1. Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana, USA
2. Department of Microbiology and Immunology, Montana State University, Bozeman, Montana, USA
3. Department of Chemistry, University of Kentucky, Lexington, Kentucky, USA
4. Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia, USA
5. Department of Chemistry and Biochemistry, Utah State University, Logan, Utah, USA
6. Department of Microbiology, University of Washington, Seattle, Washington, USA
7. Institute of Biological Chemistry, Washington State University, Pullman, Washington, USA