tokens: PKC-zeta cells expressed a more differentiated phenotype as assessed by changes in morphology , surface antigen expression , and lysosomal enzyme activities and were distinct from parental U937 cells stimulated to differentiate by exposure to phorbol esters .
folded_tokens: pkc-zeta cells expressed a more differentiated phenotype as assessed by changes in morphology , surface antigen expression , and lysosomal enzyme activities and were distinct from parental u937 cells stimulated to differentiate by exposure to phorbol esters .
labels: B-protein_molecule O O O O O O O O O O O O O O O O O O B-protein_family_or_group I-protein_family_or_group O O O O O B-cell_line B-cell_line I-cell_line O O O O O O B-other_organic_compound I-other_organic_compound O