Assertion: carotenoid | /r/HasProperty | acquired through the diet
Facets:
Source sentences:
text: Unlike other pigments used as animal colorants, carotenoids cannot be synthesized de novo by animals and so must be acquired through the diet (Goodwin 1984 ).
text: Unlike other pigment types such as melanins, carotenoids cannot be synthesized by vertebrates and must instead be acquired through the diet .