Fig. 2.

Effect of inorganic sulfur on cell motility in MDA-MB-231 cells. Cells were cultured in the presence of various concentrations of inorganic sulfur (0, 12.5, 25, or 50 µmol/L) for 8 h with a Boyden chamber. A) Microphotography of cells treated with inorganic sulfur in cell migration assay. B) Quantitative analysis of cell motility assay. The number of migrated cells was expressed as a percentage of the control (without inorganic sulfur). Each bar represents the mean ± SE from 3 independent experiments. Significant differences (P < 0.05) among groups are indicated by different letters above each bar.