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Effect of metformin on the apoptotic rate of the primary fetal rat hippocampal neurons under oxygen-glucose deprivation. (TUNEL-stained green cells showed apoptosis-positive cells, DAPI-stained blue as nucleated cells, Merge stained with TUNEL and DAPI. Apoptosis rate comparison: ** P<0.01 compared with control group, the difference was statistically significant; ## compared with the model group P<0.01, the difference was statistically significant).
