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Effect of apocynin, verapamil and SNP on metal unexposed and metal exposed aortic rings. Values represent the mean ± S.E.M. (n=5); **P≤0.05; represents significant difference between effects of apocynin, verapamil, SNP on pollutant exposed and unexposed rings (unpaired Students t- test), *P≤0.05; indicates a significant difference in PE-induced contraction with respect to control (ANOVA) followed by Duncan's multiple range test; n: number of tissues.
