Assertion: chorion | /r/MadeOf | the two layers of trophoblast
Facets:
Source sentences:
text: It is formed by extraembryonic mesoderm and the two layers of trophoblast and surrounds the embryo and other membranes.
text: It is formed by extraembryonic mesoderm and the two layers of trophoblast and surrounds the embryo and other membranes.