Assertion: dermis's cell | /r/HasProperty | become
Facets:
value: by the time
type: TEMPORAL
Source sentences:
text: Older cells in the prickle layer are in turn replaced and move up to form the granular layer, where they begin to lose their nuclei and, by the time they have moved up through the next two layers to reach the top of the epidermis, they have become flattened dead scales.