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Reactive oxygen species (ROS) generation and effect of NAC on cell viability of 4T1 cells. (A) Measurement of intracellular ROS generation in 4T1 cells detected by flow cytometry 1 hour post treatment. (a) Control; (b) SDT; (c) PDT; (d) SPDT. (B) MTT assay of cell viability in 4T1 cells 48 hours post SPDT treatment with or without ROS scavenger NAC. *p<0.05 and **p<0.01 versus SPDT treatment.
