A 500-bp fragment encompassing this hypersensitive site ( nt 4481 to 4982 ) exhibited transcription-enhancing activity ( two- to threefold ) when it was cloned in its natural position with respect to the HIV-1 promoter after transient transfection in U937 and CEM cells .
a 500-bp fragment encompassing this hypersensitive site ( nt 4481 to 4982 ) exhibited transcription-enhancing activity ( two- to threefold ) when it was cloned in its natural position with respect to the hiv-1 promoter after transient transfection in u937 and cem cells .
O B-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O B-other_name I-other_name O O 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-cell_line O B-cell_line I-cell_line O