| PDE5 | phosphodiesterase type 5 |
| EDHF | endothelium derived hyperpolarizing factor |
| PGI2 | prostacyclin |
| cAMP | cyclic adenosine monophosphate |
| cGMP | cyclic guanosine monophosphate |
| NO | nitric oxide |
| eNOS | endothelial nitric oxide synthase |
| VEGF | vascular endothelial growth factor |
| PKA | protein kinase A |
| PKG | protein kinase G |
| PEG400 | polyethylene glycol 400 |
| HPLC | high-performance liquid chromatography |
| FTIR | Fourier transform infrared spectroscopy |
| FBS | foetal bovine serum |
| MTT | 3-(4,5-dimethylthiazolyl-2-yl)-diphenyl-tetrazolium bromide |
| RH | relative humidity |
| LC-MS/MS | liquid chromatography with tandem mass spectrometry |
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