Assertion: embryonic stem cell | /r/HasProperty | derived at early stage of development
Facets:
value: very
type: DEGREE
Source sentences:
text: Embryonic stem cells (often referred to as ES cells) are stem cells that are derived from the inner cell mass of a mammalian embryo at a very early stage of development, when it is composed of a hollow sphere of dividing cells (a blastocyst).