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Influence of the NOS inhibitor l-NAA on the effect of resveratrol on eNOS enzyme activity. EA.hy926 cells were treated with the indicated concentrations of resveratrol for 24 h. Then an [14C]l-arginine/[14C]l-citrulline conversion assay was performed as described both in the presence and absence of the NOS inhibitor l-NAA. [14C]l-citrulline production was normalized to the untreated control (*** p < 0.001; mean ± SD, n = 3).
