1. Department of Microbiology and Molecular Genetics, University of Vermont, Burlington, Vermont, USA
2. Department of Biology, University of Vermont, Burlington, Vermont, USA
3. Vermont Genetics Network Proteomics Facility, University of Vermont, Burlington, Vermont, USA
4. Department of Medicine, University of Vermont, Burlington, Vermont, USA
5. Department of Microbiology and Immunology, Stanford School of Medicine, Stanford, California, USA
6. Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA