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. 2021 Mar 10;11:5549. doi: 10.1038/s41598-021-85002-1

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Localisation of gpr139 mRNA expression in the brain of zebrafish. In situ hybridisation shows expression of gpr139 mRNA in the ventral habenula (vHb) (A, B). Double labelling of gpr139 mRNA (C, F) with Kiss1 (D) or GPR151(G) immunofluorescence further confirmed specific expression of gpr139 mRNA in the vHb (E) but not in the dorsal habenula (dHb) (H). In the vHb, GPR151-immunoreactive neuropil structure is also seen, which are derived from the dHb (H, asterisks). In the hindbrain region, no expression of gpr139 mRNA was detected in the locus coeruleus (I–K). The dotted box indicates the location for the inset in the panel I. HB habenula; VT ventral thalamus; OT optic tectum; OC optic chiasma; dHb dorsal habenula; vHb ventral habenula; LC locus coeruleus; TS torus semicircularis; CCe cerebellar corpus; NLV nucleus lateralis valvulae; GC central gray; MLF nucleus of the medial longitudinal fascicle; NI nucleus isthmi; LLF lateral longitudinal fascicle; SRF superior reticular formation; SR superior raphe nucleus; TTB tecto-bulbar tract; DIL, diffuse nucleus of inferior lobe. Scale bars: (A, F–H), 100 µm; (B) inset of (I), 50 µm; (C–E), 20 µm; (I, J), 200 µm.