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特許 係属中 The μ-opioid receptors (MOR) are a class of opioid receptors with high affinity for enkephalins and beta-endorphin but low affinity for dynorphins. They are also referred to as μ opioid peptide (MOP) receptors. The prototypical μ receptor agonist is morphine, the primary psychoactive alkaloid in opium. In fact, μ (mu) refers to morphine.