These qualitative differences in the response to T cell activation are reproduced not only when HIV-1 or HIV-2 enhancers are placed upstream of a heterologous promoter but also when these enhancers are switched between their respective LTR .
these qualitative differences in the response to t cell activation are reproduced not only when hiv-1 or hiv-2 enhancers are placed upstream of a heterologous promoter but also when these enhancers are switched between their respective ltr .
O O O O O O O B-cell_type I-cell_type O O O O O O O O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O B-DNA_family_or_group O O O O O B-DNA_domain_or_region O