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Concentration-dependent vasorelaxation in response to ACh (A) or NaNO2 (B) in pulmonary artery rings isolated from Ctr or MCT-treated rats without or with CR. Values are mean ± standard error of the mean (n = 10 vascular segments per group from 5 animals). **P < 0.01 versus Ctr and #P < 0.05, ##P < 0.01 versus MCT using a 2-way repeated-measures ANOVA followed by Bonferroni post hoc tests.
