Fig. 4From: Oxidative stress mediated by gyrophoric acid from the lichen Umbilicaria hirsuta affected apoptosis and stress/survival pathways in HeLa cellsRepresentative dot-plot diagram of MMP changes after GA treatment alone or after NAC pre-treatment. Data were obtained from three independent experiments and significant differences were marked as * P < 0.05, ** P < 0.01, *** P < 0.001 versus untreated cells (control); + P < 0.05, ++ P < 0.01, +++ P < 0.001 versus GABack to article page