1. Departments of Pathology and Laboratory Medicine, Cell and Molecular Pharmacology, and Experimental Therapeutics, Medical University of South Carolina, Charleston, South Carolina 29425, Department of Microbiology, Immunology and Cell Biology, West Virginia University, School of Medicine, Morgantown, West Virginia 26506, Department of Biology, Coastal Carolina University, Conway, South Carolina 29528, and Department of Biology, College of Charleston, Charleston, South Carolina 29424