Assertion: carotenoid's role | /r/CapableOf | support system
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text: The role of vitamin A, most notably its role as precursor to all-trans-retinoic acid, requires the cooperation of numerous cofactors and supporting systems, many of which are predicted to be redox sensitive; hence, the biochemical efficiency of acquiring, sequestering, storing, and transporting vitamin A should be indicative of the overall condition of the organism.