tokens: We developed retroviral vectors in which the constitutive viral enhancer in the U3 region of the 3' LTR is replaced by an autoregulatory enhancer of the erythroid-specific GATA-1 transcription factor gene .
folded_tokens: we developed retroviral vectors in which the constitutive viral enhancer in the u3 region of the 3' ltr is replaced by an autoregulatory enhancer of the erythroid-specific gata-1 transcription factor gene .
labels: O O B-virus I-virus O O O B-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 O O B-DNA_domain_or_region I-DNA_domain_or_region O 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 B-protein_family_or_group I-protein_family_or_group O O