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. 2016 Jul 7;6:29048. doi: 10.1038/srep29048

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The images show the depth of 2–3 mm of the tumor surface. Overlay images are made by merging of TUNEL and DAPI staining images. The scale of the images is 100 μm. The percentage of the apoptotic cells is compared to the untreated group (*P < 0.05).