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A number of metalloenzymes utilize a tyrosyl free radical as a catalytically competent cofactor. The chemistry and physicochemistry of tyrosyl radicals are summarized. Tyrosyl radical enzymes, galactose oxidase, ribonucleotide reductase, photosystem II and prostaglandine H synthase are described, with focus on the generation and reactivity of the free radical. This may serve as a basis for discussing...
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