In contrast , NF-kappa B p50 alone fails to stimulate kappa B-directed transcription , and based on prior in vitro studies , is not directly regulated by I kappa B .
in contrast , nf-kappa b p50 alone fails to stimulate kappa b-directed transcription , and based on prior in vitro studies , is not directly regulated by i kappa b .
O O O B-protein_subunit I-protein_subunit I-protein_subunit O O O O B-other_name I-other_name I-other_name O O O O O O O O O O O O O O B-protein_molecule I-protein_molecule I-protein_molecule O