tokens: Restoration of the CCAAT box or insertion of an erythroid Kruppel-like factor ( EKLF ) binding site in the delta promoter activates its expression in several erythroid cell lines .
folded_tokens: restoration of the ccaat box or insertion of an erythroid kruppel-like factor ( eklf ) binding site in the delta promoter activates its expression in several erythroid cell lines .
labels: O 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 I-DNA_domain_or_region I-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 O B-DNA_domain_or_region I-DNA_domain_or_region O O O O O B-cell_line I-cell_line I-cell_line O