Effects of rGSTO2 on apoptosis of RAW264.7 macrophages. (A) RAW264.7 macrophages were stimulated with rGSTO2 and then stained with Annexin V and propidium iodide (PI), followed by the detection of apoptosis using flow cytometry. (B) Apoptosis rate of RAW264.7 macrophages stimulated by different concentrations of rGSTO2; Ns means that the difference is not significant, ** p < 0.01 and ***p < 0.001 indicates a significant difference compared to the control group. All data are expressed as means ± SD (n = 3).