tokens: Starting with a replication-incompetent molecular clone of human immunodeficiency virus type 1 , lacking all the NF-kappa B and Sp1 binding sites present in the native long terminal repeat ( LTR ) , proviruses containing reconstructed LTRs with individual or combinations of NF-kappa B and Sp1 elements were generated and evaluated for their capacity to produce virus progeny following transfection-cocultivation .
folded_tokens: starting with a replication-incompetent molecular clone of human immunodeficiency virus type 1 , lacking all the nf-kappa b and sp1 binding sites present in the native long terminal repeat ( ltr ) , proviruses containing reconstructed ltrs with individual or combinations of nf-kappa b and sp1 elements were generated and evaluated for their capacity to produce virus progeny following transfection-cocultivation .
labels: O O O B-virus I-virus I-virus I-virus B-virus I-virus I-virus I-virus I-virus O O O O O O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region O O B-virus O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O O O O O O O O O O O O O B-virus I-virus O B-other_name O