tokens: One explanation for the perpetuation of virus infection in macrophages could be sustained nuclear NF-kappa B expression .
folded_tokens: one explanation for the perpetuation of virus infection in macrophages could be sustained nuclear nf-kappa b expression .
labels: O O O O O O B-other_name I-other_name O B-cell_type O O O B-other_name B-protein_molecule I-protein_molecule O O