Affiliation: | *Department of Microbiology, ‡Comprehensive Cancer Center, Duke University Medical Center, Durham, North Carolina 27710; §Institut für Saeugetiergenetik, GSF-Forschungsinstitut Neuherberg, D-85764 Oberschleissheim, Germany; and ‖Division of Oral Biology, Faculty of Dentistry, The University of Western Ontario, London, Ontario, Canada N6A 5C1 |