this activity increased at least two-fold after dimethylformamide ( dmf ) or retinoic acid ( ra ) was added to cell cultures , and as much as ten to thirty-fold when cells were exposed to 12-o-tetradecanoylphorbol-13-acetate ( pma ) , an agent that induces monocytoid differentiation in hl-60 cells .
C0007634
cells
C0007589
differentiation