1. Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110, United States
2. Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri 63110, United States
3. Center for Women’s Infectious Disease Research, Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri 63110, United States