PMA treatment , and not retinoic acid treatment of the U937 cells acts in inducing NF-KB expression in the nuclei .
pma treatment , and not retinoic acid treatment of the u937 cells acts in inducing nf-kb expression in the nuclei .
B-other_organic_compound O O O O B-other_organic_compound I-other_organic_compound O O O B-cell_line I-cell_line O O O B-protein_molecule O O O B-cell_component O