Assertion: epithelium | /r/HasProperty | called
Facets:
Source sentences:
text: Epithelium is so called because the name was originally used to describe the translucent covering of small "nipples" of tissue on the lip.
text: When the epithelium is composed of a single layer of cells, it is called simple epithelial tissue and those containing two or more layers of cells are called stratified epithelial tissues.