tokens: Adding purified NF-kappa B protein to nuclear extracts from cells with restricted expression overcomes this lack of binding .
folded_tokens: adding purified nf-kappa b protein to nuclear extracts from cells with restricted expression overcomes this lack of binding .
labels: O O B-protein_molecule I-protein_molecule O O B-cell_component I-cell_component O O O B-other_name I-other_name O O O O O O