tokens: In 1991 , we demonstrated , using electrophoretic mobility shift assays , that 3 different factors ( termed B1 , B2 and B3 ) with affinity for the KB-enhancer target sequence were specifically detected in nuclear extracts from HIV1 -infected monocytes and macrophages .
folded_tokens: in 1991 , we demonstrated , using electrophoretic mobility shift assays , that 3 different factors ( termed b1 , b2 and b3 ) with affinity for the kb-enhancer target sequence were specifically detected in nuclear extracts from hiv1 -infected monocytes and macrophages .
labels: O O O O O O O B-other_name I-other_name I-other_name I-other_name O O O O O O O B-protein_molecule O B-protein_molecule O B-protein_molecule O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O B-cell_component I-cell_component O B-virus O O O B-cell_type O