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. 2018 Oct 1;9:71. doi: 10.1186/s40104-018-0284-7

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© The Author(s). 2018

Open Access This 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. 4 — Antioxidant status and immunity of laying hens. a Gene expression levels of thioredoxin (TXN), thioredoxin reductase (TXNR), and cytochrome b5 reductase (CYB5R) and b GSH/GSSG contents in the liver of the old and young hens in Exp. 1. *means P < 0.05; **means P < 0.01. c Effects of dietary supplementation of AA on T-AOC and malonaldehyde (MDA) level and d Total GSH, GSSG, and GSH concentrations in the liver of old laying hens in Exp. 2. Within each panel, means without a common letter differ at P < 0.05