Assertion: cns stem cell | /r/HasProperty | maintained in vitro
Facets:
value: for a long time
type: TEMPORAL
Source sentences:
text: Thus, the report indicates that human CNS stem cells obtained from early fetuses can be maintained in vitro for a long time without differentiating, induced to differentiate into the three major lineages of the CNS (and possibly two kinds of neurons, GABAergic and TH-positive), and engraft (in rats) in vivo .