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Microscopic analysis of apoptotic A549 cells by annexin V-FITC staining after treating PBS or various concentrations (1–10 µM) of NMPi followed by light irradiation for 0 or 8 J/cm2. DAPI stain (blue, first column) and annexin V-FITC stain (green, second column) indicate nuclei and apoptotic cells, respectively. Bars, 100 µm.
