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Localization of oprm1 mRNA expression in the brain of zebrafish. Schematic coronal drawing of the brain of zebrafish showing the distribution of oprm1 mRNA expression. (A) Lines on a schematic sagittal drawing view of the zebrafish brain indicate levels of coronal sections, (B–N) coronal sections showing the distribution of oprm1 mRNA. n = 3, Scale bars: B–G (100 μm) and H–N (200 μm).
