We used the MOR agonist [D-Ala2 (link), NMe-Phe4 (link), Gly-ol5 (link)]-enkephalin (DAMGO; H-2535, Bachem), ethanol (ethanol, E7148, Sigma-Aldrich) and GABAA receptor antagonist picrotoxin (PTX, P1675, Sigma-Aldrich). Other reagents used for making solutions were purchased from Sigma-Aldrich or Fisher Scientific.
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