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Medical Definition of Opioid peptides
1. The endogenous peptides with opiate-like activity. The three major classes currently recognised 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. (12 Dec 1998)
Lexicographical Neighbors of Opioid Peptides
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