1. The Institute for Genomic Research, 9712 Medical Center Drive, Rockville, MD 20850, USA.
2. Department of Microbiology and Tropical Medicine, George Washington University, Washington, DC 20052, USA.
3. Seattle Biomedical Research Institute, 307 Westlake Avenue North, Seattle, WA 98109–2591, USA.
4. Department of Pathobiology, University of Washington, Seattle, WA 98195, USA.
5. Division of Biomedical and Health Informatics, University of Washington, Seattle, WA 98195, USA.