Figure 2. Phenylephrine dose-response curve for rat thoracic aortic artery rings preincubated in the presence or absence of lipopolysaccharide (LPS+ and LPS-, respectively) and with or without endothelium (intact and denuded, respectively). Each data point represents mean+/-SEM with n = 24-28 animals. *P < 0.05 compared to the lipopolysaccharide-treated counterpart.