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TUNEL assay detecting apoptosis induced by 0.02% MMC in ECF. Panel A demonstrates the early control of no MMC treatment, panel B shows effects of early MMC treatment, panel C is late control (no MMC) and panel D shows effects of late MMC treatment on ECF. TUNEL-positive cells are stained in red and nuclei in blue with DAPI. Arrows denote TUNEL-positive cells. Magnification 400x. Bar = 100μm
