Figure 3. The PGE2 receptor is involved in I/R injury. A-E: Ischemia-reperfusion (I/R) injury markedly upregulated the expression of EP1-4 at day 3, and β-tubulin was used as a loading control in all samples. Data were shown as mean ±standard error of the mean (SEM; *p < 0.05, **p<0.01, n=6).