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Opioid receptors and their endogenous ligands and precursors.
| Receptor | Precursor | Peptide |
|---|---|---|
| DOP | Pro-enkephalin | [Met]-enkephalin |
| [Leu]-enkephalin | ||
| KOP | Pro-dynorphin | Dynorphin-A |
| Dynorphin-B | ||
| MOP | POMC | β-Endorphin |
| Unknown | Endomorphin-1 | |
| Endomorphin-2 | ||
| NOP | Pre-pro-nociceptin | N/OFQ |
