1. Department of Molecular Medicine, Mayo Clinic, Rochester, MN 55905.
2. Department of Immunology, Mayo Clinic, Rochester, MN 55905.
3. Department of Internal Medicine, Mayo Clinic, Rochester, MN 55905.
4. Department of Pathology and Laboratory Medicine, Mayo Clinic, Rochester, MN 55905.
5. Department of Microbiology and Immunology and Sylvester Comprehensive Cancer Center, University of Miami School of Medicine, Miami, FL 33136.
6. Institute of Molecular Medicine, University of Leeds, Leeds LS9 7TF, UK.