1. Department of Bioengineering; University of Washington; Seattle WA 98195 USA
2. Department of Pathology; University of Washington; Seattle WA 98195 USA
3. Department of Genome Sciences; University of Washington; Seattle WA 98195 USA
4. Department of Laboratory Medicine; University of Washington; Seattle WA 98195 USA
5. Department of Medicine; University of Washington; Seattle WA 98195 USA
6. Fred Hutchinson Cancer Research Center; Seattle WA 98109 USA