Assertion: membrane's protein | /r/HasProperty | collagen
Facets:
Source sentences:
text: The primary components of these materials are proteins, and the most abundant protein is collagen.
text: The animal kingdom is unique among eukaryotic organisms because most animal tissues are bound together in an extracellular matrix by a triple helix of protein known as collagen.
text: Cartilage consists of cells and proteins (collagen and elastin) scattered in a ground substance (modified polysaccharides).