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Chemical structure of the 5-HT1B agonist CP 93129 dihydrochloride and mean contractile responses of mesenteric artery (MA; n = 6), mesenteric vein (MV; n = 6), ruminal artery (RA; n = 6), and ruminal vein (RV; n = 6) to increasing concentrations of CP 93129 dihydrochloride. Graphical points represent the mean and bars represent the SEM.
