Methods Fifteen female SD rats were divided into three groups according to their age: immature group(IMG),matured group(MG) and climacteric group (CMG). Their oviducts were embedded by paraffin and then sectioned.

• 方法分别以5只1月龄、8月龄和18月龄健康雌性SD大鼠作为性成熟前期组(IMG)、性成熟期组(MG)和更年期组(CMG)。