World Congress on Human Reproduction
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چکیده
The initial events in embryo implantation invol ve an interaction of two epithelia, trophoblast and uterine epithelium, via their apical cell poles, resulting in ·adhesion, followed (in invasive types of implantation) by penetration of the trophoblast through the uterine epithelium into the endometrial stroma. Acquisition of mutual adhesiveness of apical plasma membranes of trophoblast and uterine epithelium appears to be a critical step in implantation initiation. It can be regarded as a cell biological paradox since epithelia are normally nonadhesi ve at their apical cell poles (Denker: Verh.Anat.Ges. 80, 93-114, 1986).
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