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Effects of NMN supplementation on the early apoptosis of heat-stressed porcine oocytes. A Representative images of apoptotic oocytes at metaphase II stage in control, heat-stressed and NMN-supplemented groups. Scale bar, 30 μm. B The fluorescence intensity of Annexin-V 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
