?:definition
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Fat-soluble vitamin consisting of 20 carbons with a methyl-substituted cyclic ring on one end of a hydrocarbon chain with 4 double bonds and either a hydroxyl, aldehyde, or carboxylic acid group on the other end.
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Retinoid with a hydroxyl group. Active form of vitamin A which can be converted to the other usable forms; retinal (an aldehyde) and retinoic acid (a carboxylic acid).
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