Department of Genome Sciences, University of Washington, Seattle, WA 98109, USA.|Department of Genome Sciences, University of Washington, Seattle, WA 98109, USA.|Department of Genome Sciences, University of Washington, Seattle, WA 98109, USA.|Department of Genome Sciences, University of Washington, Seattle, WA 98109, USA.|Department of Genome Sciences, University of Washington, Seattle, WA 98109, USA.|University of Washington Proteomics Resource, Seattle, WA 98109, USA.|Department of Genome Sciences, University of Washington, Seattle, WA 98109, USA.