Assertion: telencephalon's cell | /r/CapableOf | upregulate glial specific factors
Facets:
value: after closure of the neural tube
type: TEMPORAL
Source sentences:
text: After closure of the neural tube, neuroepithelial cells begin to upregulate glial specific factors, at which point they are thought to transform into RG cells and acquire the potential to generate neurons and glia (Aaku-Saraste et al., 1996; Morest and Silver, 2003).