1. Department of Cell and Developmental Biology; Vanderbilt University School of Medicine; Nashville TN 37232
2. Department of Pathology, Microbiology and Immunology; Vanderbilt University School of Medicine; Nashville TN 37232
3. Department of Medicine; Vanderbilt University School of Medicine; Nashville TN 37232
4. Veterans Affairs Tennessee Valley Healthcare System; Nashville TN 37212
5. Center for Structural Biology, Vanderbilt University School of Medicine; Nashville TN 37232