Assertion: pericardium's layer | /r/HasProperty | secreted by the epithelium
Facets:
Source sentences:
text: Serous membranes are covered by a thin layer of serous fluid that is secreted by the epithelium.
text: Serous membranes are covered by a thin layer of serous fluid that is secreted by the epithelium.
text: Serous membranes are covered by a thin layer of serous fluid that is secreted by the epithelium.