1Division of Genetics and Development, Department of Pediatrics, University of Washington, Seattle, USA.
2Division of Immunology, Department of Pediatrics, Infectious Disease and Rheumatology, University of Washington, Seattle, USA
3Celltech Chiroscience, Inc., Bothell, USA
4Department of Pediatrics, University of Alabama, Birmingham, USA
5Department of Pediatrics, Steele Memorial Children’s Research Center, University of Arizona, Tucson, USA
6Department of Pediatrics, University of Virginia, Charlottesville, USA
7Division of Genetics and Development, Seattle, USA