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. 2023 May 4;13:7287. doi: 10.1038/s41598-023-34405-3

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Scheme 1 — Main reactions catalyzed by cystathionine γ-lyase. The α,γ-elimination of cystathionine leads to cysteine formation (top) while the α,β-elimination of cysteine produces the biological gaseous mediator H₂S (bottom). The steps leading from the internal aldimine to the formation of the external aldimine are not shown for reasons of clarity.