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Interrelations between the one carbon cycle (methionine cycle) and the folates cycle. B6: vitamin B6, B12: vitamin B12, DHFR: dihydrofolate reductase, CBS, cystathionine beta synthase pathway, MS: methionine synthase, MTHFR: methylene tetrahydrofolate reductase, THF: tetrahydrofolate. SAH: S adenosylhomocysteine, SAM: S adenosyl methionine, CpG: cytosine phosphate guanine, Zn: zinc.
