tokens: A novel B cell-restricted activity , required for high levels of octamer / Oct -dependent transcription from an immunoglobulin heavy chain ( IgH ) promoter , was detected in an in vitro system consisting of HeLa cell -derived extracts complemented with fractionated B cell nuclear proteins .
folded_tokens: a novel b cell-restricted activity , required for high levels of octamer / oct -dependent transcription from an immunoglobulin heavy chain ( igh ) promoter , was detected in an in vitro system consisting of hela cell -derived extracts complemented with fractionated b cell nuclear proteins .
labels: O B-other_name I-other_name I-other_name I-other_name O O O O O O B-DNA_domain_or_region O B-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 O O O O O O O O O O B-cell_line I-cell_line O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O