Assertion: collagen | /r/AtLocation | blood vessels
Facets:
Source sentences:
text: it is also found in bones, corneas and blood vessels.
text: Collagen can also be found in the skin, cornea, blood vessels, cartilage, digestive tract, and intervertebral disc.
text: Collagen is also found in ligaments, blood vessels, bone, the cornea of the eye, and of course, in skin.
text: Collagen is a major structural protein in the human body (found in skin, joints, bones, blood vessels and connective tissues).