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Vitamin A metabolism begins with dietary intake either as preformed vitamin A (retinol and retinyl esters) from animal foods or as provitamin A carotenoids from plant sources. In the small intestine, retinyl esters are hydrolyzed to retinol, while carotenoids such _______ _____ ______ _______ ______ _______ __________ ____ ______ _______.
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