Fig 3. (+)-Usnic acid inhibits invasion of H1650 and H1975 human lung cancer cell.

(A-B) Invasion assay of H1650, and H1975 cells treated with 5 μM of (+)-usnic acid (A), and quantitative analysis of invaded cell numbers in each cell line (B). Representative images are shown from three independent experiments, n = 3. Data represent mean ± S.E.M. (standard error of the mean). **p<0.01; ***p<0.001; NS, no significant difference compared to 0.01% DMSO-treated A549 cells.