| PTZ | pentylenetetrazole |
| OGDHC | 2-oxoglutarate dehydrogenase complex |
| OADHC | 2-oxoadipate dehydrogenase complex |
| PDHC | pyruvate dehydrogenase complex |
| GDH | glutamate dehydrogenase |
| MDH | malate dehydrogenase |
| PLK | pyridoxal kinase |
| PNPO | pyridoxal 5′-phosphate oxidase; |
| GS | glutamine synthetase |
| ME | malic enzyme |
| GOT | glutamate-oxaloacetate transaminase |
| GPT | glutamate-pyruvate transaminase |
| GABA | gamma-aminobutyric acid |