1. Laboratory of Lymphocyte Signaling and Development, Molecular Immunology Programme, The Babraham Institute, Babraham, Cambridge CB2 4AT, United Kingdom
2. COS Corporation, Bothell, WA 98021
3. Department of Biochemistry, University of Dundee, Dundee, DD1 5EH, United Kingdom
4. The Molecular Biology Institute, University of California, Los Angeles, CA 90095
5. Department of Immunology, University of Washington, School of Medicine, Seattle, WA 98195
6. Department of Pediatrics, University of Washington, School of Medicine, Seattle, WA 98195