The promoters were used without enhancers , or with enhancers derived from the beta-globin locus control region and the alpha-globin HS-40 enhancer .
the promoters were used without enhancers , or with enhancers derived from the beta-globin locus control region and the alpha-globin hs-40 enhancer .
O B-DNA_family_or_group O O O B-DNA_family_or_group O O O B-DNA_family_or_group O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O