tokens: Protein kinase C activation and protooncogene expression in differentiation/retrodifferentiation of human U-937 leukemia cells .
folded_tokens: protein kinase c activation and protooncogene expression in differentiation/retrodifferentiation of human u-937 leukemia cells .
labels: B-protein_molecule I-protein_molecule I-protein_molecule O O B-DNA_family_or_group O O B-other_name O B-cell_line I-cell_line I-cell_line I-cell_line O