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. 2016 Jul 30;16:84. doi: 10.1186/s12876-016-0500-x

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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.

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Fig. 5 — Treg cell differentiation in vitro. The percentage of CD4⁺CD25⁺Foxp3⁺ Tregs (a). Quantified CD4⁺CD25⁺Foxp3⁺ Tregs (b). Culture supernatant IL-6 (c). Culture supernatant TGF-β (d). Data are the mean ± SE. n = 4. *P < 0.05; **P < 0.01. But40, 40 μM sodium butyrate. But80, 80 μM sodium butyrate