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Mean values±standard error of (a) serum lysozyme activity (u/ml), (b) interleukin-2 (IL-2) titer (pg/ml), and (c) IL-2 (pg/ml) in control and experimental groups which received water contained 75 mg/L chlorpyrifos and/or 200 mg/L zinc oxide nanoparticles. Columns having different scripts at the same time are significantly different at p≤0.05 (n=10).
