1 文書を見つけるための辞書。

• trophoblast
• 栄養芽層
• 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"
• 発達段階の初期で胚盤胞の壁を形成する細胞膜