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. 2019 Feb 4;9:1366. doi: 10.1038/s41598-018-37613-4

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© The Author(s) 2019

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Experimental design. Female Tph2 WT and KO focal mice were housed together in pairs with each one unfamiliar female partner mouse of either the same or the other genotype. Social behaviour of the focal animal (arrows) was recorded for two hours directly after introduction on day 1 as well as on day 5 (original photo of the two mice: Dirk-Heinz Loddenkemper).