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. 2022 Nov 22;24:257. doi: 10.1186/s13075-022-02945-0

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© The Author(s) 2022

Open AccessThis 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/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 4 — IHC staining results of promiscuous and private groups. A Mean arthritis score (0–60) of the CIA experiment with DBA1/J. B Hematoxylin-eosin staining of naïve mouse hind paw and arthritic DBA1/J hind paw (arthritis score > 12). C Representative IHC staining results from promiscuous, private and HC sera. D MOD is a parameter to measure the in vitro reactivity of sera to naïve and arthritic joint tissue. 40X, 400X: the magnification of pictures. MOD: mean of integrated optical density. pro-RA: promiscuous RA sera; pro-OA: promiscuous OA sera; pri-RA: private RA sera; pri-OA: private OA sera; HC: healthy individuals sera