| NO | nitric oxide, |
| GTP | guanosine triphosphate, |
| cGMP | cyclic guanosine monophosphate, |
| PKG | protein kinase G, |
| eNOS | endothelial NO synthase, |
| iNOS | inducible NO synthase, |
| PDE-5 | phosphodiesterase 5, |
| PDE-5-I | PDE-5 inhibitor, |
| Ca | calcium |
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