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Overview of folate metabolism. Enzymes with polymorphisms investigated in the present study are boxed. DHF, dihydrofolate; dTMP, deoxythymidine monophoshate; dUMP, deoxyuridine monophoshate; SAH, S‐adenosylhomocysteine; SAM, S‐adenosylmethionine; THF, tetrahydrofolate.
