1. Department of Immunology, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
2. Department of Microbiology, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
3. Broad Institute, Cambridge, MA 02142, USA.
4. Center for Computational and Integrative Biology, Massachusetts General Hospital, Boston, MA 02114, USA.
5. Gastrointestinal Unit and Center for the Study of Inflammatory Bowel Disease, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02142, USA.
6. The Howard Hughes Medical Institute, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.