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Enzymatic pathways involved in hydrogen sulphide formation. CBS: cystathionine β-lyase; CTH: γ-cystathionase; MPST: 3-mercaptopyruvate sulfurtransferase; CAT: cysteine aminotransferase; 3MP: 3-mercaptopyruvate; PA: pyruvate; and PLP: pyridoxal phosphate; CN−: cyanide; SCN−: thiocyanate.
