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Ability of the 5-HT7 receptor antagonist SB-269960 to antagonize 5-CT-induced relaxation in the isolated Ab IVC (A) and PV (B). Points represent means ± SE for the number of animals in parentheses. These veins were taken from the same animals for intra-arterial comparison. *Significant difference vs. vehicle-exposed tissues at the maximum agonist concentration tested (P < 0.05).
