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UVA-mediated dose-dependent damage to lysosomal membranes in FEK4 cells as monitored after 30-min treatment with the acidotropic lysosomal dye under an epifluorescence microscope. (A) Nonirradiated control cells. (B) Cells irradiated with 100 kJ/m2. (C) Cells irradiated with 250kJ/m2. (D) Cells irradiated with 500 kJ/m2. (A–C, ×400; D, ×600, in presence of immersion oil.)
