1. Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue N., P.O. Box 19024, Seattle, Washington 98109-1024, Institute for Systems Biology, 1441 N. 34th Street, Seattle, Washington 98103-8904, Biological Sciences Division and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, MSIN: K8-98, Richland, Washington 99352, and Plasma Proteome Institute, P.O. Box 53450, Washington DC 20009-3450