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Chemical structure of the 5-HT4 agonist BIMU-8 and mean contractile responses of mesenteric artery (MA; n = 5), mesenteric vein (MV; n = 5), ruminal artery (RA; n = 5), and ruminal vein (RV; n = 5) to increasing concentrations of BIMU-8. Graphical points represent the mean and bars represent the SEM.
