A more than additive increase in IRF-1 gene expression was seen with ATRA and IFN-gamma in NB4 cells .
a more than additive increase in irf-1 gene expression was seen with atra and ifn-gamma in nb4 cells .
O O O O O O B-DNA_domain_or_region I-DNA_domain_or_region O O O O B-other_organic_compound O B-protein_molecule O B-cell_line I-cell_line O