Gelatin zymography analysis of MMP-2 and MMP-9 activity in SGC7901 cells. Cells were incubated for 24 h and conditioned media were used for the measurement of MMP-2 and MMP-9 protein levels by gelatin zymography. (A) Photographs of the MMP-2 and MMP-9 bands, which are representative of three independent experiments, are shown. (B) Quantitative analysis of the bands. *p < 0.01 compared with SGC7901 and SGC7901/shRNA-control.