Assertion: collagen's level | /r/HasProperty | i and iii collagen
Facets:
Source sentences:
text: As the skin ages, the levels of type I and III collagen, as well as elastin, decrease in the dermis, resulting in the loss of elasticity.
text: As the skin ages, the levels of type I and III collagen, as well as elastin, decrease in the dermis, resulting in the loss of elasticity.