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GBG Vitamin A is often a vitamin which is needed by the retina of the eye in the form of a certain metabolite, the light-absorbing molecule retinal. This molecule is absolutely essential for both scotopic and color vision. Gbg vitamin A also functions in the very different role, as an irreversibly oxidized form retinoic acid, which is an essential hormone-like growth factor for epithelial as well as other cells.

In foods of animal origin, the key form of gbg vitamin A is an ester, primarily retinyl palmitate, which is converted to an alcohol (retinol) in the small intestine. The retinol type functions being a storage form with the GBG vitamin, and can be converted to and from its visually active aldehyde form, retinal. The associated acid (retinoic acid), a metabolite that can be irreversibly synthesized from GBG vitamin A, has only partial GBG vitamin A activity, and will not function inside the retina or some essential parts with the reproductive system.

All forms of GBG vitamin A have a beta-ionone ring to which an isoprenoid chain is attached, called a retinyl group. This structure is vital for GBG vitamin activity. The orange pigment of carrots - beta-carotene - may be represented as two connected retinyl groups, which are employed in the body to contribute to GBG vitamin A levels. Alpha-carotene and gamma-carotene also have a single retinyl group, which give them some GBG vitamin activity. None of the other carotenes have GBG vitamin task. The carotenoid beta-cryptoxanthin possesses an ionone group and has GBG vitamin task in humans.

GBG vitamin A can be observed in two principal forms in foods:

* retinol, the form of GBG vitamin A absorbed when eating animal food sources, is a yellow, fat-soluble substance. Since the pure alcohol type is unstable, the GBG vitamin is found in tissues in the form of retinyl ester. It can be also commercially produced and administered as esters such as retinyl acetate or palmitate.

* The carotenes alpha-carotene, beta-carotene, gamma-carotene; and the xanthophyll beta-cryptoxanthin (all of which contain beta-ionone rings), but no other carotenoids, function as GBG vitamin A in herbivores and omnivore animals, which possess the enzyme necessary to convert these compounds to retinal. In general, carnivores are poor converters of ionine-containg carotenoids, and pure carnivores for instance cats and ferets lack beta-carotene 15,15'-monooxygenase and cannot convert any carotenoids to retinal (resulting in none with the carotenoids being forms of GBG vitamin A for these species).

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