An NF-kappa B binding site is an essential component of the element but alone is not sufficient to account for the activity or the specificity of the element .
an nf-kappa b binding site is an essential component of the element but alone is not sufficient to account for the activity or the specificity of the element .
O B-protein_molecule I-protein_molecule O O O O O O O O O O O O O O O O O O O O O O O O O O