Assertion: oocyte | /r/HasProperty | enveloped
Facets:
value: by follicle cells
type: OTHER
value: in the ripe stage
type: TEMPORAL
Source sentences:
text: In the ripe stage, the oocytes are still enveloped by follicle cells, and a vitellin envelope with microvilli projecting toward the follicle cells is formed at the oocyte periphery.