1. Institute for Systems Biology, Seattle, WA 98109, USA.
2. Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892-0421, USA.
3. Department of Immunology, University of Washington, Seattle, WA 98109, USA.
4. Department of Global Health, University of Washington, Seattle, WA 98109, USA.