1. Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
2. Center for Structural Biology of Infectious Diseases, Chicago, Illinois, USA
3. Consortium for Advanced Science and Engineering, University of Chicago, Chicago, Illinois, USA
4. Structural Biology Center, X-ray Science Division, Argonne National Laboratory, Argonne, Illinois, USA
5. Northwestern Synchrotron Research Center, Life Sciences Collaborative Access Team, Northwestern University, Argonne, Illinois, USA
6. Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, Virginia, USA
7. Department of Microbiology, Immunology and Infectious Diseases, University of Calgary, Calgary, Alberta, Canada
8. Department of Biochemistry and Molecular Genetics, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA