| NO | Nitric oxide |
| PTIO | 2-(4-Carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1–1-oxy-3-oxide |
| ADC | Arginine decarboxylase |
| Put | Putrescine |
| Spd | Spermidine |
| Spm | Spermine |
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