1. Hauptman-Woodward Medical Research Institute, Buffalo, New York, USA
2. Departments of Structural Biology, University at Buffalo, State University of New York, Buffalo, New York, USA
3. Medicine, University at Buffalo, State University of New York, Buffalo, New York, USA
4. Microbiology and Immunology, University at Buffalo, State University of New York, Buffalo, New York, USA
5. Witebsky Center for Microbial Pathogenesis, University at Buffalo, State University of New York, Buffalo, New York, USA
6. Veterans Administration Western New York Healthcare System, Buffalo, New York, USA