1. Laboratory of Genome Integrity; Experimental Immunology Branch; and Science Applications International Corporation-Frederick, Frederick Cancer Research and Development Center; National Cancer Institute, National Institutes of Health, Bethesda, MD 20814
2. The Novo Nordisk Foundation Center for Protein Research, Faculty of Health Sciences, University of Copenhagen, 2200 Copenhagen N, Denmark
3. Department of Experimental Medicine, University of La Sapienza, 00184 Rome, Italy
4. Department of Pathology and Immunology and Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO 63110
5. Howard Hughes Medical Institute, Department of Molecular Genetics and Microbiology and Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78705
6. Department of Genetics, Harvard Medical School, Boston, MA 02115