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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Conversion of β-carotene to retinol (vitamin A). β-Carotene-15,15-dioxygenase catalyses the central cleavage of β-carotene that yields two molecules of retinal. Subsequently, retinal reductase catalyses the reduction of retinal to retinol.