tokens: LIF induced a dose-dependent increase in p24 antigen production in the chronically infected promonocytic cell line U1 .
folded_tokens: lif induced a dose-dependent increase in p24 antigen production in the chronically infected promonocytic cell line u1 .
labels: B-protein_molecule O O O O O B-protein_molecule I-protein_molecule O O O B-cell_line I-cell_line I-cell_line I-cell_line I-cell_line I-cell_line O