. "trophoblast"@en-us . . "0"^^ . . . . "01462209-n"^^ . . . . "101462209"^^ . . "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\""@en-us . . "0"^^ . . . "101385582"@en-us . . "trophoblast"^^ .