1 Departments of Surgery and; Microbiology & Immunology, and; Transplantation Biology Program, University of Michigan, Ann Arbor, Michigan. Electronic address: plattjl@umich.edu.
2 Department of Molecular and Biomedical Sciences, and; Comparative Medicine Institute, North Carolina State University, Raleigh, North Carolina.
3 Departments of Surgery and; Microbiology & Immunology, and; Transplantation Biology Program, University of Michigan, Ann Arbor, Michigan.