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MOR binding in 16 μm coronal brain sections in the absence and presence of the selective MOR receptor antagonist naloxone. a Incubation with the radioligand [3H]D-Ala2-MePhe4-Gly-ol5 enkephalin yielded MOR binding in the striatum. b Incubation with the same radioligand and an excess of unlabeled naloxone yielded no binding, indicating that binding in a is specific to the MOR
