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Structural analysis of the mammary gland: a–b HE staining showed that the mammary gland was normal in histology in both the superovulation group and normal group (duct:
; fat cells:
). Scale bar: 50 μm. c Irregularly shaped Golgi-derived secretory vesicles were observed in the acini of the superovulation group (normal secretory vesicle:
; irregularly shaped Golgi-derived secretory vesicles: 
). Scale bar: 1 μm. S = superovulation group; N = normal group
