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. Author manuscript; available in PMC: 2010 Oct 1.
Published in final edited form as: Am J Obstet Gynecol. 2009 Aug 15;201(4):394.e1–394.11. doi: 10.1016/j.ajog.2009.06.042

Figure 1. Folate Pathway in Humans.

Figure 1

Substrates are shown in rectangular boxes. DHF: dihydrofolate; Hcy: homocysteine; MET: methionine; SAM: S-Adenosyl-methionine; SAH: S-Adenosylhomocysteine; THF: tetrahydrofolate

Enzymes are shown in ellipses. ACHY: S-adenosylhomocysteine hydrolase; BHMT: betaine-homocysteine methyltransferase; CBS: cystathionine-β-synthase; DHFR: dihydrofolate reductase; MAT2A: methionine adenosyltransferase II alpha; MAT2B: methionine adenosyltransferase II beta; MTHFD1: methylenetetrahydrofolate dehydrogenase; MTHFR: methylenetetrahydrofolate reductase; MTR: methyltetrahydrofolate-homocysteine methyltransferase; MTRR: MTR reductase; TYMS: thymidylate synthase; MT: methyl-transferases