Assertion: placenta | /r/HasProperty | mateno-fetal organ
Facets:
Source sentences:
text: The placenta a mateno-fetal organ which begins developing at implantation of the blastocyst and is delivered with the fetus at birth.
text: The placenta is a mateno-fetal organ which begins developing at implantation of the blastocyst and is delivered with the fetus at birth.