Real-time PCR determines the action of TGF-α and YAP levels on the mRNA expression of AREG. Each bar represents the mean ± SEM (n = 5). Bars with different letters are significantly different from each other (Ctrl vs. TGF-α, P < 0.0001; MXIV vs. YAP, P < 0.0001; MXIV vs. YAPS127A, P < 0.0001). 