Mesh : Animals Antigens, Viral Cell Nucleus / immunology Cell Transformation, Neoplastic Cells, Cultured Cytomegalovirus / metabolism DNA / biosynthesis Herpesviridae / immunology Herpesvirus 2, Gallid Herpesvirus 2, Saimiriine Herpesvirus 4, Human / immunology Humans Leukemia, Experimental / microbiology Leukocytes / immunology Lymphocytes / microbiology Simplexvirus / immunology Transformation, Genetic Virus Replication