NF-kappa B was not activated by retinoic acid , which induced morphological differentiation of all the neuroblastoma cell lines used in the present study .
nf-kappa b was not activated by retinoic acid , which induced morphological differentiation of all the neuroblastoma cell lines used in the present study .
B-protein_molecule I-protein_molecule O O O O B-other_organic_compound I-other_organic_compound O O O O O O O O B-cell_line I-cell_line I-cell_line O O O O O O