[1] Univ Chicago, Dept Pathol, Comm Immunol, Chicago, IL 60637 USA
[2] Univ Chicago, Comm Canc Biol, Chicago, IL 60637 USA
[3] Univ Virginia Hlth Syst, Dept Microbiol, Charlottesville, VA 22908 USA
[4] Univ Virginia Hlth Syst, Carter Immunol Ctr, Charlottesville, VA 22908 USA
[5] La Jolla Inst Allergy & Immunol, Div Vaccine Discovery, La Jolla, CA 92037 USA
[6] Univ Illinois, Dept Biochem, Urbana, IL 61801 USA