tokens: Analysis of long terminal repeat -driven secreted alkaline phosphatase activity in transient assays showed that , unlike human immunodeficiency virus type 1 , the SIV long terminal repeat possesses an enhancer region just upstream of the NF-kappaB element which maintains significant levels of basal transcription in the absence of NF-kappaB and Sp1 sites .
folded_tokens: analysis of long terminal repeat -driven secreted alkaline phosphatase activity in transient assays showed that , unlike human immunodeficiency virus type 1 , the siv long terminal repeat possesses an enhancer region just upstream of the nf-kappab element which maintains significant levels of basal transcription in the absence of nf-kappab and sp1 sites .
labels: O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O B-protein_molecule I-protein_molecule O O O O O O O O B-virus I-virus I-virus I-virus I-virus O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O B-protein_molecule O O O O O O O O O O O O O O O O O