Assertion: placenta | /r/CapableOf | originate following implantation
Facets:
value: from maternal and fetal tissues
type: TRANSITIVE-OBJECT
Source sentences:
text: Following implantation, the placenta originates from maternal and fetal tissues, producing human chorionic gonadotropin (HCG) that helps in maintaining the level of corpus luteum in the ovary until the placenta begins synthesizing its own progesterone and estrogen hormones.