tokens: Regulation of immunoglobulin heavy chain ( IgH ) gene expression is controlled by a B cell-specific promoter , intronic enhancer and additional B cell-specific enhancer elements identified recently in the 3' end of the IgH locus .
folded_tokens: regulation of immunoglobulin heavy chain ( igh ) gene expression is controlled by a b cell-specific promoter , intronic enhancer and additional b cell-specific enhancer elements identified recently in the 3' end of the igh locus .
labels: 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 B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_domain_or_region I-DNA_domain_or_region O O B-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 B-DNA_domain_or_region I-DNA_domain_or_region O