tokens: Cell-to-cell contact activates the long terminal repeat of human immunodeficiency virus 1 through its kappaB motif .
folded_tokens: cell-to-cell contact activates the long terminal repeat of human immunodeficiency virus 1 through its kappab motif .
labels: B-other_name I-other_name O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O B-virus I-virus I-virus I-virus O O B-DNA_domain_or_region I-DNA_domain_or_region O