Quantitative real-time PCR analysis of HOXA4, YAP, CTGF, and CYR61 in HEK 293T cells with knockdown of endogenous HOXA4 and/or overexpression of YAP-5SA. *P<0.05, **P<0.01 vs YAP-5SA with shCtrl, by ANOVA with Sidak's correction. 