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SNP-induced relaxation to PE contraction in endothelium-denuded vascular rings of C and LP rats (semilog plot). Submaximal PE contraction was elicited, increasing concentrations of SNP were added and then the percentage of relaxation to PE contraction was measured. Data points represent means ± SEM of measurements in 10–12 mesenteric arterial rings from 5–6 rats of each group.
