1. Department of Pathology, Department of Medicine, Graduate Program in Immunology and Virology, University of Massachusetts Medical School, Worcester, MA 01655
2. Amgen, Inc., South San Francisco, CA 94080
3. Zymogenetics, Inc., Seattle, WA 98102
4. Department of Laboratory Medicine and Pathobiology, Program in Proteomics and Bioinformatics, University of Toronto, M5S 3G4 Toronto, Canada