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| Opioid Peptides Opiates, Endogenous | Endogenous Opiates | Opiate Peptides | Opioid Peptide | Peptide, Opioid | Peptides, Opiate | Peptides, Opioid 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. |