Fusion of the upstream portion of the delta promoter to the truncated beta globin promoter yielded a modest increase in promoter strength relative to the truncated beta gene promoter , indicating the presence of a positive transcriptional element ( s ) in the upstream delta globin regulatory region .
fusion of the upstream portion of the delta promoter to the truncated beta globin promoter yielded a modest increase in promoter strength relative to the truncated beta gene promoter , indicating the presence of a positive transcriptional element ( s ) in the upstream delta globin regulatory region .
O O O B-DNA_domain_or_region I-DNA_domain_or_region O O B-DNA_domain_or_region I-DNA_domain_or_region O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O O O O 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 O O O O B-DNA_family_or_group I-DNA_family_or_group I-DNA_family_or_group O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O