1. Human Vaccine Institute and Department of Surgery, Duke University School of Medicine, Durham, NC 27710, USA.
2. Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC 27710, USA.
3. Department of Immunology, Duke University School of Medicine, Durham, NC 27710, USA.
4. Human Vaccine Institute and Department of Medicine, Duke University School of Medicine, Durham, NC 27710, USA.
5. Howard Hughes Medical Institute, Program in Cellular and Molecular Medicine, Boston Children’s Hospital, Department of Genetics, Harvard Medical School, Boston, MA 02115, USA.
6. Department of Chemistry, University of Kansas, Lawrence, KS 66049, USA.
7. Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709, USA.
8. Corporate Research Materials Lab, 3M Company, St. Paul, MN 55144, USA.
9. Bioqual, Rockville, MD 20850, USA.