1. Department of Microbiology, University of Iowa, Iowa City, IA 52242, USA.
2. Cluster of BioTherapeutics, Leiden Academic Centre for Drug Research, Leiden University, 2333 CC Leiden, Netherlands.
3. Department of Pathology, Immunology and Laboratory Medicine, University of Florida, Gainesville, FL 32611, USA.
4. Interdisciplinary Graduate Program in Immunology, University of Iowa, Iowa City, IA 52242, USA.
5. Department of Pathology, University of Iowa, Iowa City, IA 52242, USA.