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It was named due to the fact that the “water-soluble factor B” (Vitamin B) had just recently been discovered and therefore researchers chose the name “fat-soluble factor A” (Vitamin A).
Vitamin A does not a take on a very complex structure. “Retinol is the immediate precursor to two important active metabolites: retinal, which plays a critical role in vision, and retinoic acid, which serves as an intracellular messenger that affects transcription of a number of genes.” (Lancet, 1995) It is structurally related to carotene. “Carotene is converted into Vitamin A in the liver.” (Harrison, 1997) An oxidative splitting of beta carotene occurs in the small intestine...
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