the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall; "after implantation of the blastocyst in the uterine wall the trophoblast divides into two layers, the chorion and the placenta"
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1. 妊娠性絨毛性疾患:疫学、臨床症状、および診断 gestational trophoblastic disease epidemiology clinical manifestations and diagnosis