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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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Effect of GPR139 agonist on preference to the neutral compartment during fear memory recall. (A) Representative top-view video tracking of swimming behaviour in controls (a and c, 0.2% and 2% DMSO, respectively) and the fish treated with GPR139 agonist (b and d, 0.1 and 1 µg/g BW of JNJ-63533054, respectively). (B) Total time spent in the neutral context (grey compartment) during post-conditioning in controls and GPR139 agonist-treated fish. The fish treated with 0.1 µg/g BW of GPR139 agonist spent a significantly (P = 0.0477) longer time in the neutral compartment as compared to control. *, P < 0.05. n.s., no significant difference.