When sequences from -417 to -207 5' to the zeta-globin mRNA cap site were deleted , up to 95% of the zeta-globin promoter activity was lost in K562 cells .
when sequences from -417 to -207 5' to the zeta-globin mrna cap site were deleted , up to 95% of the zeta-globin promoter activity was lost in k562 cells .
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 O O B-RNA_molecule I-RNA_molecule O O O O O O O O O O B-protein_family_or_group O O O O O B-cell_line I-cell_line O