Assertion: skin's layer | /r/MadeOf | simple columnar epithelium
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: Usually, the epithelial layer of the membrane consists of either stratified squamous epithelium (multiple layers of epithelial cells, the top layer being flattened) or simple columnar epithelium (a layer of column-shaped epithelial cells, the cells being significantly greater in height than width).