SEARCH Articles Figures Tables Methylenetetrahydrofolate Methylenetetrahydrofolate reductase C677T polymorphism Methylenetetrahydrofolate reductase MTHFR) Methylenetetrahydrofolate reductase MTHFR) enzyme Methylenetetrahydrofolate reductase MTHFR), polymorphisms Methylenetetrahydrofolate reductase defect Methylenetetrahydrofolate reductase deficiency Methylenetetrahydrofolate reductase homocysteine metabolism Methylenetetrahydrofolate reductase polymorphism