Assertion: amnion | /r/HasAspect | two cell layers
Facets:
Source sentences:
text: The amnion is comprised of two cell layers: the epiblast-derived extraembryonic ectodermal layer and the thin non-vascular extraembryonic mesoderm.
text: It is comprised of two cell layers: the epiblast-derived extraembryonic ectodermal layer and the thin non-vascular extraembryonic mesoderm.