Fig. 2
a Sk-Br-3, c MCF-7, e U87, g HF-5 cells viability results after 4 h incubation with either 5 or 10 µM Ce6 followed by irradiation with 665 nm for various durations. In the dark control group, cells were incubated with 10 µM Ce6 for 4 h without irradiation, and in the light control group, cells were irradiated with 8 J/cm2 without prior Ce6 incubation: b Sk-Br-3, d MCF-7, f U87, h HF-5 cells viability results after 4 h incubation with either 0.15 or 0.6 mM 5-ALA followed by irradiation using 635 nm. In the dark control group, cells were incubated with 0.6 mM 5-ALA for 4 h without irradiation and in the light control group, cells were irradiated with 8 J/cm2 without prior 5-ALA incubation. Experiments were repeated at least 3 times and presented are mean and standard deviation