| cAMP | 3′,5′-cyclic adenosine monophosphate |
| cGMP | 3′,5′-cyclic guanosine monophosphate |
| CNG | cyclic nucleotide gated |
| IRD | inherited retinal degeneration |
| Ka | activation Constant |
| PKA | cAMP-dependent protein kinase A |
| PKAi | PKA inhibitor peptide |
| PKG | cGMP-dependent protein kinase G |