By using HIV LTR deletion mutants , the NF-kappa B binding sites were found to be critical for response to the pCD41 trans-activation .
by using hiv ltr deletion mutants , the nf-kappa b binding sites were found to be critical for response to the pcd41 trans-activation .
O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O B-protein_molecule I-protein_molecule B-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O O O B-DNA_molecule O O