tokens: This absence of binding was localized to the NF-kappa B region of the HIV-1 enhancer ; the 65-kDa plus 50-kDa NF-kappa B heterodimer was preferentially lost .
folded_tokens: this absence of binding was localized to the nf-kappa b region of the hiv-1 enhancer ; the 65-kda plus 50-kda nf-kappa b heterodimer was preferentially lost .
labels: O O O O O O O O B-protein_molecule I-protein_molecule O O O B-virus O O O B-protein_complex I-protein_complex I-protein_complex B-protein_molecule I-protein_molecule O O O O O