OGE diminished cell viability of A549 cell. The cell viability of A549 cells (a) and BEAS-2B cells (b) treated with serial concentrations of OGE (10, 50, 100, 200 and 300 ) for 48 h was determined. Data were expressed as mean for 3 independent experiments. and, as comparing to control (c). n.s., no statistical significance.