1. Laboratory of Molecular Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, United States
2. Department of Pediatrics, Harvard Medical School, Boston, Massachusetts 02115, United States
3. Ragon Institute of MGH, MIT and Harvard, Cambridge, Massachusetts 02139, United States
4. Program in Cellular and Molecular Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, United States
5. Department of Chemistry and Biochemistry, Swarthmore College, Swarthmore, Pennsylvania 19081, United States
6. Duke Human Vaccine Institute, Duke University, Durham, North Carolina 27710, United States
7. Department of Immunology, Duke University, Durham, North Carolina 27710, United States
8. Department of Microbiology, Harvard Medical School, Boston, Massachusetts 02115, United States