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The folate/homocysteine pathway. CBS: cystathionine ß-synthase; DHF: dihydrofolate; DHFR: dihydrofolate reductase; dTMP: deoxythymidine monophosphate; dUMP: deoxyuridine monophosphate; MTHFR: 5,10-methylenetetrahydrofolate reductase; MTR: methionine synthase; MTRR: methionine synthase reductase; THF: tetrahydrofolate; TYMS: thymidylate synthase.
