Activation of the CD4 promoter occurs in the presence of the viral DNA polymerase inhibitor phosphonoformic acid , which limits expression to the immediate-early and early classes of viral genes .
activation of the cd4 promoter occurs in the presence of the viral dna polymerase inhibitor phosphonoformic acid , which limits expression to the immediate-early and early classes of viral genes .
O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O B-other_organic_compound I-other_organic_compound I-other_organic_compound B-other_organic_compound I-other_organic_compound O O O O O O O O O O O O O O