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H2S and bound sulfur generation from l-cysteine (A) and d-cysteine (B) in mammalian tissues. CBS: cystathionine β-synthase; CSE: cystathionine γ-lyase, CAT: cysteine aminotransferase, MST: mercaptopyruvate sulfurtransferase, α-KG: α-ketoglutarate, DAO: d-amino acid oxidase, 3MP: 3-mercaptopyruvate, red: reduction; oxi: oxidation.
