| AA | ascorbic acid |
| CBS | cystathionine β-synthase |
| 5-CH3THF | methyltetrahydrofolic acid |
| 5-CH3THF-13C5 | 5-methyltetrahydrofolic acid-13C5 |
| 5-CHOTHF | 5-formyltetrahydrofolic acid |
| 10-CHOFA | 10-formylfolic acid |
| 5,10-CH+THF | 5,10-methenyl-5,6,7,8-tetrahydrofolic acid |
| FA | folic acid |
| FA-13C5 | folic acid-13C5 |
| FBP | Folate-binding proteins |
| Hcy | homocysteine |
| Ox | oxidation |
| 2-MCE | 2-mercaptoethanol |
| MA | methionine adenosyltransferase |
| Met | methionine |
| L-Met-13C5 | L-methionine-13C5 |
| MTHFR | 5,10-methenyl-5,6,7,8-tetrahydrofolic acid reductase |
| MS | methionine synthase |
| hmTHF | 4-α-hydroxy-5-methyltetrahydrofolate |
| pABG | p-aminobenzoyl-L-glutamic acid |
| SAH | S-ade-homocysteine |
| SAM | S-ade-methionine |
| THF | tetrahydrofolic acid |
| UHPLC–MS/MS | ultra-high-performance liquid chromatography–MS/MS |
| WB | whole blood |
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