Assertion: placenta's function | /r/HasProperty | protective
Facets:
Source sentences:
text: Later, when the decidua is more fully formed, this invasion becomes resisted, and it was the observation of this fact that led Turner and others to the conclusion that the main function of the decidua was protective; proof of this is found in tubal gestation in which decidual formation is very imperfect in the tube and the chorionic villi penetrate much more deeply than in the uterus.