Assertion: tissue's cell | /r/HasProperty | germinal layers
Facets:
Source sentences:
text: Gastrulation is the next phase of embryonic development, and involves the development of two or more layers of cells (germinal layers).
text: The outer surface of each ovary is covered by a layer of cells (germinal epithelium); these surround the immature egg cells, which are present in the ovaries from the time of birth.