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Credit: Phil Degginger/SCIENCE PHOTO LIBRARY

Caption: Retinol is vitamin A derived from animal sources such as liver, kidney, eggs and dairy products. It is a fat-soluble vitamin essential for vision and cell growth.

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Keywords: beta-carotene, beta-ionone ring, bi-polar, biology, chemistry, diagram, illustration, model, molecular, molecular model, molecular structure, molecule, retinoic acid, retinol, retinyl palmitate, vitamin, vitamin a

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