Assertion: cartilage's matrix | /r/HasProperty | collagen fibers
Facets:
Source sentences:
text: A cartilage is made up of extracellular matrix composed of collagen fibers, ground substance that is rich in proteoglycan, and elastin fibers.
text: These chondrocytes produce large amounts of extracellular matrix composed of collagen fibres, proteoglycan, and elastin fibers.