tokens: All immunoglobulin genes contain a conserved octanucleotide promoter element , ATGCAAAT , which has been shown to be required for their normal B-cell-specific transcription .
folded_tokens: all immunoglobulin genes contain a conserved octanucleotide promoter element , atgcaaat , which has been shown to be required for their normal b-cell-specific transcription .
labels: O B-DNA_family_or_group I-DNA_family_or_group O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O B-polynucleotide O O O O O O O O O O B-other_name I-other_name B-other_name O