| MOR, μ | Mu-opioid receptor |
| DOR, δ | Delta-opioid receptor |
| KOR, κ | Kappa-opioid receptor |
| cAMP | cyclic adenosine monophosphate |
| DAMGO, [D-Ala2, N-Me-Phe4, Gly5-ol] | enkephalin |
| GTPγS | guanosine-5′-O-thio-triphosphate |
| CHO | Chinese hamster ovary |
| PDB | Protein Data Base |
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