Affiliation: | (1) Genex Corporation, 16020 Industrial Drive, 20877 Gaithersburg, Maryland;(2) Present address: Department of Microbiology and Immunology, East Carolina University, 27834 Greenville, NC;(3) Present address: Department of Microbiology, Molecular, and Cell Biology, Penn State University, College of Science, 16802 University Park, PA |