In contrast , mutation of the kappa B enhancer results in markedly attenuated activities of both promoters .
in contrast , mutation of the kappa b enhancer results in markedly attenuated activities of both promoters .
O O O O O O B-protein_domain_or_region I-protein_domain_or_region I-protein_domain_or_region O O O O O O O B-DNA_domain_or_region O