When transcriptionally active , the human immunodeficiency virus ( HIV ) promoter contains a nucleosome-free region encompassing both the promoter /enhancer region and a large region ( 255 nucleotides [ nt ] ) downstream of the transcription start site .
when transcriptionally active , the human immunodeficiency virus ( hiv ) promoter contains a nucleosome-free region encompassing both the promoter /enhancer region and a large region ( 255 nucleotides [ nt ] ) downstream of the transcription start site .
O O O O O B-virus I-virus I-virus O B-virus O B-DNA_domain_or_region O O O O O O O B-DNA_domain_or_region O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O