1. Department of Immunology and Microbiology, University of Colorado Denver, Denver, CO 80045, USA.
2. Department of Biochemistry and Molecular Genetics, University of Colorado Denver, Denver, CO 80045, USA.
3. Center for Genes, Environment and Health, National Jewish Health, Denver, CO 80206, USA.
4. Department of Immunology, Mayo Clinic College of Medicine and Science, Rochester, MN 55905, USA.
5. University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104, USA.