Assertion: vitamin c | /r/HasProperty | required for the biosynthesis of collagen
Facets:
Source sentences:
text: Vitamin C is required for the biosynthesis of collagen, L-carnitine, and certain neurotransmitters; vitamin C is also involved in protein metabolism .
text: Vitamin C is required for the biosynthesis of collagen, L-carnitine, and certain neurotransmitters.