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Production of homocysteine as part of the amino acid and purine biosynthesis pathway. DHF = dihydrofolate, THF = tetrahydrofolate, MTHFR = methylene-tetrahydrofolate-reductase, TS = thymidylate-synthase, MTR = methionine-synthase, MTRR o MSR = methionine-synthase-reductase.
