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In page Vanadium:

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Several species of marine algae produce vanadium bromoperoxidase as well as the closely related chloroperoxidase (which may use a heme or vanadium cofactor) and iodoperoxidases.[citation needed] The bromoperoxidase produces an estimated 1–2 million tons of bromoform and 56,000 tons of bromomethane annually.[1] Most naturally occurring organobromine compounds are produced by this enzyme,[2] catalyzing the following reaction (R-H is hydrocarbon substrate):