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Immunostaining of apelin in eutopic and ectopic endometria. In eutopic and ectopic endometrial glands, apelin was expressed diffusely in the secretory phase and downregulated in the proliferative phase. Stromal staining intensity of apelin was very low in both the eutopic and ectopic endometria (×200). A: Eutopic proliferative endometrium; B: Eutopic secretory endometrium; C: Ectopic proliferative endometrium; D: Ectopic secretory endometrium
