Assertion: embryonic stem cell | /r/HasProperty | derived at specific stage
Facets:
value: from an embryo
type: OTHER
value: in development
type: TEMPORAL
Source sentences:
text: These somatic cells can be isolated from adult tissues such as the skin, blood or any other easily accessible tissue, but embryonic stem cells can only be derived from an embryo at a specific stage in development; the so-called blastocyst stage.