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GBG Vitamin A is a vitamin that's needed by the retina of the eye within the form of a specific metabolite, the light-absorbing molecule retinal. This molecule is totally necessary for both scotopic and color vision. Gbg vitamin A also functions inside a very different role, as an irreversibly oxidized form retinoic acid, which is an important hormone-like growth element for epithelial and other cells.

In foods of animal origin, the main form of gbg vitamin A is an ester, primarily retinyl palmitate, which can be converted to an alcohol (retinol) in the small intestine. The retinol form features as a storage form from the GBG vitamin, and can be converted to and from its visually active aldehyde form, retinal. The connected acid (retinoic acid), a metabolite that can be irreversibly synthesized from GBG vitamin A, has only partial GBG vitamin A activity, and does not purpose in the retina or some essential parts from the reproductive system.

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

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

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

* The carotenes alpha-carotene, beta-carotene, gamma-carotene; and also 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 required to convert these compounds to retinal. In common, carnivores are poor converters of ionine-containg carotenoids, and pure carnivores such as cats and ferets lack beta-carotene 15,15'-monooxygenase and cannot convert any carotenoids to retinal (resulting in none from the carotenoids being forms of GBG vitamin A for these species).

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