tokens: Using various constructs expressing a lacZ reporter gene under the control of the intact or three deleted forms of HIV-1 LTR , we obtained evidence that the kappaB regulatory elements located in the U3 region are involved in cell-to-cell activation of HIV-1 LTR .
folded_tokens: using various constructs expressing a lacz reporter gene under the control of the intact or three deleted forms of hiv-1 ltr , we obtained evidence that the kappab regulatory elements located in the u3 region are involved in cell-to-cell activation of hiv-1 ltr .
labels: O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O B-other_name I-other_name O B-DNA_domain_or_region I-DNA_domain_or_region O