These binding sites have similar sequences and multiple copies of the binding sites confer tissue-specific down-regulation when attached to a minimal lox promoter fragment .
these binding sites have similar sequences and multiple copies of the binding sites confer tissue-specific down-regulation when attached to a minimal lox promoter fragment .
O O O O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O B-other_name I-other_name O O O O B-DNA_molecule B-DNA_domain_or_region I-DNA_domain_or_region O O