Assertion: epidermis's cell | /r/CapableOf | migrate over a period of about four weeks
Facets:
value: to the outer surface
type: TRANSITIVE-OBJECT
Source sentences:
text: The main cell in the epidermis is the keratinocyte, which develops from the bottom or basal layer and then migrates upwards over a period of about four weeks to the outer surface (stratum corneum) where it is shed.