Assertion: chorion | /r/HasProperty | formed
Facets:
value: completely
type: DEGREE
Source sentences:
text: The chorion is one of the membranes that surround the fetus while it is still being formed.
text: It is formed from extra embryonic mesoderm with two layers of trophoblasts.
text: In the silkworm moth, Antheraea polyphemus, there are approximately 10 000 follicle cells that surround the oocyte in a monolayer and secrete the complex layers of the chorion, only to degenerate once the chorion has been completely formed.