Fig. 9
The glutathione peroxidase (GPX4) activity in MDA-MB-231 and A375 cancer cells upon low level laser irradiation and GA treatment. Low-level laser irradiation was used with 3 J/cm2 energy for 90 s. The results are expressed as the mean ± SD (n = 3), *P < 0.05 (compared with control groups. C-Dark: control (untreated cells in dark), C-Laser (control (untreated cells) with irradiation), GA-Dark (GA treated cells in dark) and GA-Laser (irradiation + GA treated cells)