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Vasorelaxation responses of isolated thoracic aortic rings to each concentration of acetylcholine (A, ACh, an endothelium-dependent vasodilator) or acidified NaNO2 (B, an endothelium-independent vasodilator). cP<0.01 vs young group; eP<0.05, fP<0.01 vs aging group. n=6−8 rats per group.
