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. 2020 Feb 20;14:5. doi: 10.3389/fnana.2020.00005

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Copyright © 2020 Sivalingam, Ogawa and Parhar.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Expression of oprm1 mRNA in the brain of zebrafish. Photomicrographs showing expression of oprm1 genes in sagittal (A,B) and coronal sections (C–H) of zebrafish brain. (A) Antisense probe for oprm1 gene showed positive signal and (B) Sense probes for oprm1 gene showed no signals. (C) Medial zone of dorsal telencephalic area, (D) Dorsal and Ventral nucleus of ventral telencephalic area, (E,F) Anterior and posterior part of parvocellular preoptic area, (G) Habenula area, and (H) Periventricular hypothalamic area. N = 3, Scale bars: A–B (100 μm) and C–H (50 μm).