| 4-PA | 4-pyridoxic acid |
| FMN | flavin mononucleotide |
| FAD | flavin adenine dinucleotide |
| LQ | lower quartile |
| NAD | nicotinamide adenine dinucleotide |
| NADP | nicotinamide adenine dinucleotide phosphate |
| PLP | pyridoxal 5′-phosphate |
| PL | pyridoxal |
| PPO | pyridoxine phosphate oxidase |
| UHPLC/MS-MS | ultra-high-performance liquid chromatography/tandem mass spectrometry |
| UQ | upper quartile |
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