The IL-2R alpha enhancer binds NF-kappa B poorly and is only weakly activated by the NF-kappa B site alone .
the il-2r alpha enhancer binds nf-kappa b poorly and is only weakly activated by the nf-kappa b site alone .
O B-protein_subunit I-protein_subunit O O B-protein_molecule I-protein_molecule O O O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region I-DNA_domain_or_region O O