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Representative pathways for biological formation of 3-nitrotyrosine. This product has been widely assumed to arise from the interaction of secondary oxidants derived from peroxynitrite (ONOO–) with tyrosine-containing proteins. However, several alternative pathways exist, including one mediated by the enzyme myeloperoxidase (MPO), that may be important in respiring tissues. tyr, tyrosine; tyr•, tyrosyl radical.
