1. Microbiology Graduate Group, University of California Davis, Davis, California, USA
2. J. Craig Venter Institute, La Jolla, California, USA
3. J. Craig Venter Institute, Rockville, Maryland, USA
4. Institute of Marine and Environmental Technology, and Department of Microbiology and Immunology, University of Maryland, Baltimore, Maryland, USA
5. Department of Molecular Biology, University of Wyoming, Laramie, Wyoming, USA
6. Department of Evolution and Ecology, UC Davis Genome Center, Department of Medical Microbiology and Immunology, University of California Davis, Davis, California, USA