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Serine hydroxymethyltransferase, cytosolic Methylenetetrahydrofolate reductase Methionine synthase Cystathionine gamma-lyase Cystathionine beta-synthase Cystathionine beta-synthase Betaine-- homocysteine S- methyltransferase 1 S- adenosylmethionine decarboxylase proenzyme Spermidine synthase S-methyl-5'- thioadenosine phosphorylase Adenosylhomocysteinase Betaine-- homocysteine S- methyltransferase 1 L-amino-acid oxidase Methionine-- tRNA ligase, cytoplasmic Methionyl-tRNA formyltransferase, mitochondrial S- adenosylmethionine synthase Choline dehydrogenase, mitochondrial Methionine-R- sulfoxide reductase B3 Methionine-R- sulfoxide reductase B2, mitochondrial Glycine N- methyltransferase L-Homoserine L-Cysteine Homocysteine Tetrahydrofolic acid L-Serine 5,10-Methylene-THF Glycine 5-Methyltetrahydrofolic acid L-Methionine L-Cystathionine H2O 2-Ketobutyric acid L-Serine H2O L-Serine H2O S-Adenosylmethionine S-Adenosylmethioninamine CO2 Putrescine 5'-Methylthioadenosine Spermidine Pi 5-Methylthioribose 1-phosphate L-Methionine S-Adenosylhomocysteine Adenosine βine Dimethylglycine H2O O2 2-Oxo-4-methylthiobutanoic acid NH3 H2O2 ATP AMP PPi 10-Formyltetrahydrofolate Tetrahydrofolic acid ATP Pi PPi Choline Methionine sulfoxide Sarcosine Glycine Pyridoxal 5'-phosphate Zinc (II) ion Pyridoxal 5'-phosphate Pyridoxal 5'-phosphate Zinc (II) ion FAD Acceptor Reduced acceptor oxidized thioredoxin reduced thioredoxin tRNA(Met) L- Methionyl- tRNA(Met) N- formylmethionyl- tRNA(fMet) Glycine and Serine Metabolism Cysteine Metabolism Sulfate/Sulfite Metabolism FAD Pyridoxal 5'-phosphate Zinc (II) ion NAD Magnesium Potassium Zinc Zinc FAD Intracellular space Nuclear envelope Mitochondria Mitochondria