The outermost layer of cells of the blastocyst that attaches the fertilized ovum to the uterine wall and serves as a nutritive pathway for the embryo.

 
  • 胚胎滋养层囊胚细胞的最外层,它会将受精卵与子宫壁连在一起,同时它是胚胎获取营养的通道
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