Sp family members preferentially interact with the promoter proximal repeat within the HTLV-I enhancer .
sp family members preferentially interact with the promoter proximal repeat within the htlv-i enhancer .
B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O 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