tokens: The human immunodeficiency virus ( HIV ) type 1 long terminal repeat ( LTR ) contains binding sites for nuclear factor kappa B ( NF-kappa B ) and the constitutively expressed transcription factor Sp1 , both of which are highly conserved in HIV and simian immunodeficiency virus isolates .
folded_tokens: the human immunodeficiency virus ( hiv ) type 1 long terminal repeat ( ltr ) contains binding sites for nuclear factor kappa b ( nf-kappa b ) and the constitutively expressed transcription factor sp1 , both of which are highly conserved in hiv and simian immunodeficiency virus isolates .
labels: O B-virus I-virus I-virus I-virus B-virus O O O O O O O B-DNA_domain_or_region O O O O O B-protein_molecule I-protein_molecule I-protein_molecule I-protein_molecule O B-protein_molecule I-protein_molecule O O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O O O O O O O O B-virus O B-virus I-virus I-virus O O