Site-directed mutagenesis of these cis elements demonstrated that Cp activity is highly dependent on the presence of a properly positioned CCAAT box , with the dependence on the distal CCAAT box apparent only when the proximal CCAAT box was deleted or mutated .
site-directed mutagenesis of these cis elements demonstrated that cp activity is highly dependent on the presence of a properly positioned ccaat box , with the dependence on the distal ccaat box apparent only when the proximal ccaat box was deleted or mutated .
B-other_name I-other_name O O B-DNA_family_or_group I-DNA_family_or_group O O B-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 B-DNA_domain_or_region I-DNA_domain_or_region O O O O B-DNA_domain_or_region B-DNA_domain_or_region I-DNA_domain_or_region O O O O O