Analysis of SelS expression in transfected HUVECs. A. Level of SelS mRNA expression presented as a ratio to GAPDH following real-time PCR analysis. B. Level of SelS protein expression presented as a ratio to β-actin following densitometric analysis of western blots. C. Western blot analysis of SelS. 1, 2, 3, 4: control group, pc-SelS group, vector control group and siRNA-SelS group, respectively. *P < 0.01 compared with control group.