Figure 4: Inhibitory effects of HL on invasion of A549 cells In vitro invasion assay using Matrigel invasion chamber. (A) Representative images for invaded cells in the presence or absence of HL. The cells were stained with crystal violet. Scale bar; 50 μm. (B) Quantification of invaded cells in (Figure 2A). The data shown are the mean ± SE (n=5) from three independent experiments. Significant difference (*p<0.001) compared with control.