Citation Hunt

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Homocysteine can be converted to cysteine.

(5) Cystathionine-β-synthase (an enzyme which requires pyridoxal phosphate, the active form of vitamin B6) combines homocysteine and serine to produce cystathionine. Instead of degrading cystathionine via cystathionine-β-lyase, as in the biosynthetic pathway, cystathionine is broken down to cysteine and α-ketobutyrate via (6) cystathionine-γ-lyase.^{[citation needed]}

(7) The enzyme α-ketoacid dehydrogenase converts α-ketobutyrate to propionyl-CoA, which is metabolized to succinyl-CoA in a three-step process (see propionyl-CoA for pathway).^{[citation needed]}

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