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. 2021 Jan 12;12:313. doi: 10.1038/s41467-020-20042-1

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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 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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Fig. 3 — We collected data from 298, 287, and 274 participants at the first, second, and third time point, respectively. Of these participants, 205 played the fMRI task for their best friend at all three time points, of which 48 participants with stable best friendships and 75 as participants with unstable best friendships. T1 = time point 1, T2 = time point 2, T3 = time point 3.