Fig 4. Cumulative concentration response curves to phenylephrine (PE) of denuded [A] laminar arteries, [B] laminar veins and [C] facial skin arteries from healthy horses (●, n = 6) and horses with endocrinopathic laminitis (○, n = 6).

Data are expressed as a percentage of maximal contraction in response to high potassium saline (KPSS). Data are mean ± SEM. Curves were compared using two-way ANOVA. *P<0.05. There were no significant differences between healthy horses and those with EL.