The transcription factor HIV-TF1 , which binds to a region about 60 bp upstream from the enhancer of the human immunodeficiency virus-1 ( HIV-1 ) , was purified from human B cells .
the transcription factor hiv-tf1 , which binds to a region about 60 bp upstream from the enhancer of the human immunodeficiency virus-1 ( hiv-1 ) , was purified from human b cells .
O B-protein_family_or_group I-protein_family_or_group B-protein_molecule O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O O B-virus I-virus I-virus O B-virus O O O O O B-cell_type I-cell_type I-cell_type O