Affiliation: | 1. Department of Microbiology Vanderbilt University School of Medicine Nashville, Tenn. 37232, U.S.A.;2. Department of Biochemistry Vanderbilt University School of Medicine Nashville, Tenn. 37232, U.S.A.;3. Department of Pathology Vanderbilt University School of Medicine Nashville, Tenn. 37232, U.S.A. |