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Effects of NMN supplementation on the DNA damage in heat-stressed porcine oocytes. A Representative images of accumulated DNA damage in control, heat-stressed and NMN-supplemented oocytes at metaphase II stage. Scale bar, 20 μm. B The fluorescence intensity of γH2A.X signals was quantified in control, heat-stressed and NMN-supplemented oocytes. Data were presented as mean value (mean ± SD) of at least three independent experiments. ***P < 0.001
