1. Department of Veterinary Microbiology, Iowa State University, Ames, Iowa, USA
2. Division of Biology, Kansas State University, Manhattan Kansas, USA
3. Bioinformatics Research Group, SRI International, Menlo Park, California, USA
4. Department of Microbiology and Immunology, Joslin Diabetes Center, Harvard University, Cambridge Massachusetts, USA
5. Department of Nutritional Sciences, University of Wisconsin-Madison, Madison Wisconsin, USA