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Deiodinase
Deiodinase is an enzyme important in the action of thyroid hormones. In the tissues, deiodinase converts the prohormone[?] thyroxine to the active hormone triiodothyronine[?] by the removal of an iodine atom.
Deiodinases are unusual in that the enzyme contains selenium, in the form of an otherwise rare amino acid selenocysteine
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