Opioid Peptides

**Definition:** The endogenous peptides with opiate-like activity. The three major classes currently recognized are the ENKEPHALINS, the DYNORPHINS, and the ENDORPHINS. Each of these families derives from different precursors, proenkephalin, prodynorphin, and PRO-OPIOMELANOCORTIN, respectively. There are also at least three classes of OPIOID RECEPTORS, but the peptide families do not map to the receptors in a simple way.

**Tree numbers:** - D12.644.400.575 - D12.776.631.650.575

**Synonyms:** - Opioid Peptide - Opiate Peptides