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Effects of 1 μM p,p′-DDT and 10 nM TCDD against the actions of 20 μM auraptene (AUR) on intracellular reactive oxygen species (ROS) formation for 40 min in a U937 macrophage model. Data are expressed in percent change in intracellular ROS formation compared to 0.1% DMSO-treated controls. * Treatment significantly different from controls P < 0.05, ψ treatment significantly different from TCDD or DDT treatment alone P < 0.05
