1. Department of Biomedical Research, National Jewish Health, Denver, CO 80206, USA.
2. Department of Immunology and Microbiology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA.
3. Barbara Davis Center for Childhood Diabetes, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA.
4. Department of Chemistry and Chemical Biology, Cornell University, NE-CAT, Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA.
5. Benaroya Research Institute, Seattle, WA 98101, USA.
6. Department of Biochemistry and Molecular Genetics, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA.
7. Structural Biology and Biochemistry program, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA.