tokens: 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 .
folded_tokens: 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 .
labels: 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