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The effect of sodium nitroprusside on U46619-induced contractions of the porcine isolated coronary artery in the presence of either 10 nM UK114542 or a combination of 10 nM UK114542 and 10 µM quercetin. The values shown represent the mean ± SEM of eight observations, and significant difference between responses is denoted by *(P < 0.05) using a paired Student's t-test.
