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Cystine metabolism by transsulfuration enzymes. CAT: cysteine aminotransferase; CBS: cystathionine β-synthase; CDO: cysteine dioxygenase; CSAD: cysteine sulfinate decarboxylase; CSE: cystathionine γ-lyase; MST: mercaptopyruvate sulfurtransferase; TRX: thioredoxin.
