Efficiency of VEGF-C siRNA plasmid transfection (A-F) and relative mRNA expression levels of VEGF-C in cells transfected with different plasmids (G). (A-C) ×200 magnification, (D) 8 nmol/L siRNA, (E) 12 nmol/L siRNA, and (F) 20 nmol/L siRNA. *P<0.05, compared with the blank control. S1, S2 and S3 are three different sequences of siRNA. NC is the group transfected with an unrelated siRNA sequence.