We found that transactivation of the HIV-1 LTR by v-src was more sensitive to mutations of the proximal , rather than the distal , kappa B element .
we found that transactivation of the hiv-1 ltr by v-src was more sensitive to mutations of the proximal , rather than the distal , kappa b element .
O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region O 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 O