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Schematic of Homocysteine metabolism and H2S biosynthesis. H2S; hydrogen sulfide; TH4-folate, tetrahydrofolate; CBS, cystathionine β-synthase; CSE, cystathionine γ-lyase; 3MST, 3-mercaptopyruvate sulfurtransferase; AAT, aspartate aminotransferase.
