Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America.|Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America.|Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America.|Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America.|Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America.|Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America.|Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America.|Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America.|Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America.|Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America.|Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America.|Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri, United States of America.