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Activity of caspase-3 and effect of z-VAD on cell viability of 4T1 cells. (A) Western blotting analysis of Caspase-3 cleavage. (B) MTT assay of cell viability in 4T1 cells 4 hours post SPDT treatment with or without Caspase inhibitor z-VAD pretreatment. *p<0.05 versus SPDT treatment.
