tokens: NF-kB levels were higher in unstimulated U1 cells as compared to the parent cell line U937 .
folded_tokens: nf-kb levels were higher in unstimulated u1 cells as compared to the parent cell line u937 .
labels: B-protein_molecule O O O O B-cell_line I-cell_line I-cell_line O O O O B-cell_line I-cell_line I-cell_line B-cell_line O