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Mean contractile responses of (A) ruminal artery (RA), (B) ruminal vein (RV), (C) mesenteric artery (MA), and (D) mesenteric vein (MV) to increasing concentrations of TCB-2 (a selective agonist for receptor 5-HT2A) using vessels that were exposed to 0, 0.01, or 1 µM ergovaline for 2 h before TCB-2 additions.
