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Fluorescence microscopy images of AO-EtBr staining for apoptosis in A549 cells: (a) control, (b) treated with DCaC-AuNPs, (c) DCaDC-AuNPs, and (d) DCaLC-AuNPs at the highest concentration of 120 μg/mL. (EA: early apoptosis; LA: late apoptosis; DF: DNA fragmentation).
