1. Center for Immunity and Immunotherapy, Children's Hospital Research Institute, Seattle, WA 98101, USA
2. Seattle Children's Hospital, Seattle, WA 98105, USA
3. Department of Pediatrics, University of Washington, Seattle, WA 98195, USA
4. Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
5. Department of Laboratory Medicine, University of Washington, Seattle, WA 98195, USA
6. Department of Medicine, University of Washington, Seattle, WA 98195, USA