1. Graduate School of Biomedical Sciences, Tufts University, Boston, Massachusetts 02111, United States
2. Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, Massachusetts 02111, United States
3. Department of Immunology and Microbiology, Scripps Research, La Jolla, California 92037, United States
4. Department of Immunology, Tufts University School of Medicine, Boston, Massachusetts 02111, United States
5. Data Intensive Studies Center, Tufts University, Medford, Massachusetts 02155, United States
6. Department of Chemistry, Scripps Research, La Jolla, California 92037, United States