| NO | Nitric oxide |
| NOS | Nitric oxide synthase |
| iNOS | Inducible nitric oxide synthase |
| nNOS | Neuronal nitric oxide synthase |
| eNOS | Endothelial nitric oxide synthase |
| BH2 | Dihydrobiopterin |
| BH4 | Tetrahydrobiopterin |
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