|Puzzle:||Freestyle Design: Variable Length|
β,β-carotene-15,15′-dioxygenase is an enzyme that cleaves beta-carotene into two retinal, via the following reaction: Beta-carotene + O(2) <=> 2 retinal.
Beta-carotene dioxygenase plays an important role in animal vision, as retinal forms the chemical basis for vision in animals. Animals cannot synthesize retinal ''de novo'' and thus relies on beta-carotene dioxygenase to transform carotenoids (beta-carotene, alpha-carotene, gamma-carotene, and beta-cryptoxanthin) into retinal.
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