Assertion: carotenoid's activity | /r/HasAspect | this element
Facets:
value: as an essential component
type: MANNER
Source sentences:
text: The mineral element selenium is often thought to be a dietary antioxidant, but the antioxidant effects of selenium are most likely due to the antioxidant activity of proteins that have this element as an essential component (i.e., selenium-containing proteins), and not to selenium itself (4).