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The Methionine Cycle. AHCY = S-adenosylhomocysteine hydrolase; AD = adenosine deaminase; BHMT = betaine homocysteine methyltransferase; CBS = cystathione β-synthase; MAT = methionine adenosyltransferase; MTR = 5-methyltetrahydrofolate-homocysteine methyltransferase; MTRR = 5-methyltetrahydrofolate homocysteine methyltransferase reductase; MT = methyltransferase.
