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. 2019 Aug 2;9:10648. doi: 10.1038/s41598-019-46128-5

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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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Schematic diagram of tube entry tests depending on the location of the tube. (A) A sample image of the entry tube. (B) A sample picture of the setup with the entry tube close to the tube containing the cage-mate in the new home cage. (C) Schematic diagram of the setup with the entry tube distant from the tube containing the cage-mate. (D) Schematic diagram of the setup with the entry tube close to the tube with the cage-mate. (E) Schematic diagram of the setup showing the entry tube close to the tube with a ball of yarn.