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Decrease of viability in MCF7 (a,b) and MDA-MB-231 (c,d) breast cancer cells after incubation for 2 h with increasing concentrations of DXNO-GR or DOX in the dark (a,c) or after green light irradiation (72 J/cm2) (b,d). Cells were incubated for 24 h before assessing cell viability. Data are expressed as mean percentage ± SD of at least three independent experiments, carried out in triplicate. *p < 0.05; **p < 0.01; ***p < 0.001 significantly different from DOX (Student’s t-test).
