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Morphology of the metrial gland. a. Invasion of interstitial trophoblasts (arrow) into the metrial gland on GD 15. HE stain. Bar=900 µm. b. Invasion of endovascular trophoblasts into spiral arteries and localization of interstitial trophoblasts around spiral arteries in stroma. HE stain. Bar=100 µm. BZ, basal zone; DB, decidua basalis; ET, endovascular trophoblast; IT, interstitial trophoblasts; LZ, labyrinth zone; MG, metrial gland; SA, spiral artery; NK, uNK cell.
