The nuclear factor kappa B ( NF-kappa B ) is a eukaryotic transcription factor .
the nuclear factor kappa b ( nf-kappa b ) is a eukaryotic transcription factor .
O B-protein_molecule I-protein_molecule I-protein_molecule I-protein_molecule O B-protein_molecule I-protein_molecule O O O O B-protein_family_or_group I-protein_family_or_group O