Mitchell N Lefebvre1, John T Harty2,3. 1. Interdisciplinary Graduate Program in Immunology, University of Iowa, Iowa City, IA, USA. 2. Interdisciplinary Graduate Program in Immunology, University of Iowa, Iowa City, IA, USA. john-harty@uiowa.edu. 3. Department of Pathology, University of Iowa, Iowa City, IA, USA. john-harty@uiowa.edu.