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Structural analysis of the uterus: a–b Hematoxylin and eosin (HE) staining revealed that the uterus was normal in structure, with no discernible abnormalities in the morphological or histological characteristics of the uterine cells. Scale bar: 50 μm. c Normal ultrastructure of stromal cells was observed in the normal group and superovulation group (nuclei: N; mitochondria: 
). Scale bar: 1 μm. S = superovulation group; N = normal group
