#trophoblast  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"
  supertype:  #tissue_layer__membrane  a pliable sheet of tissue that covers or lines or connects organs or cells of animals
  part of:  #blastosphere__blastocyst  the blastula of mammals

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