tokens: The kappa B enhancer of the gene encoding the interleukin-2 ( IL-2 ) receptor alpha chain ( IL-2R alpha ) is functional only in the hybrids expressing nuclear NF-kappa B .
folded_tokens: the kappa b enhancer of the gene encoding the interleukin-2 ( il-2 ) receptor alpha chain ( il-2r alpha ) is functional only in the hybrids expressing nuclear nf-kappa b .
labels: O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O O O O B-protein_molecule O B-protein_molecule O O O O O B-protein_subunit I-protein_subunit O O O O O O B-cell_line O B-protein_molecule B-protein_molecule I-protein_molecule O