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Reference.org
δ-opioid receptor
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<p>The δ-opioid receptor, also known as delta opioid receptor or simply delta receptor, abbreviated DOR or DOP, is an inhibitory 7-transmembrane <a href="/facts/G-protein_coupled_receptor/0arUMkQc">G-protein coupled receptor</a> coupled to the <a href="/facts/G_protein/HKkcfgGP">G protein</a> <a href="/facts/Gi_alpha_subunit/ua0jmvM5">Gi/G0</a> and has <a href="/facts/Enkephalin/lVvearbQ">enkephalins</a> as its <a href="/facts/Endogenous_ligand/44QLL4eU">endogenous ligands</a>. The regions of the brain where the δ-<a href="/facts/Opioid_receptor/eDIAqgV3">opioid receptor</a> is largely expressed vary from species model to species model. In humans, the δ-opioid receptor is most heavily expressed in the <a href="/facts/Basal_ganglia/d9mbF6p3">basal ganglia</a> and <a href="/facts/Neocortex/YEVjPgGK">neocortical regions</a> of the brain. </p>