1. Committee on Immunology, University of Chicago, Chicago, IL 60637, USA.
2. Department of Medicine, Section of Rheumatology, University of Chicago, Chicago, IL 60637, USA.
3. Department of Ecology and Evolution, University of Chicago, Chicago, IL 60637, USA.
4. Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.