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. 2019 Feb 7;10:10. doi: 10.1186/s40104-019-0318-9

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© The Author(s). 2019

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. 1 — Effect of dietary L-lysine·H₂SO₄ levels (%) on intestinal morphology of broiler chickens. a, villous height (μm) of broiler chickens fed different diets; b, crypt depth (μm) of broiler chickens fed different diets; c, ratio of villous height to crypt depth of broiler chickens fed different diets. Data were means ± SEM (n = 6). Different letters indicate a difference (P < 0.05)