Assertion: amnion's cell | /r/CapableOf | form the syncytiotrophoblast
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Source sentences:
text: When implantation succeeds and the blastocyst adheres to the endometrium, the superficial cells of the trophoblast fuse with each other, forming the syncytiotrophoblast, a multinucleated body that digests endometrial cells to firmly secure the blastocyst to the uterine wall.