Effect of laser light irradiation on mitochondria membrane potential. The figure shows results from mitochondria function experiments. Micrographs A-D illustrate JC-1 accumulation in mitochondria of healthy cells (A, B) and of cells exposed to H2O2 (C, D), at the beginning (A, C, t = 120 sec) and end (B, D, t = 960 sec) of the observational period. E, F: graphs represent data from a typical experiment, showing the decrease over the time of fluorescence intensity values over the observational time in the absence (photobleaching due to confocal laser stimulation) and at the presence of H2O2 (oxidative stress). G, H: Δ intensity illustrates the effect of a single 20 sec (H) and 15 min (G) laser light irradiation on mitochondria membrane potential during H2O2-induced oxidative stress. Both MOD1 and MOD2 exposure to red light radiation prevent MMP variation due to oxidative stress. Statistical analysis: one-way ANOVA and post-hoc test, *p < 0.05.