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. 2024 Nov 6;20:508. doi: 10.1186/s12917-024-04341-z

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© The Author(s) 2024

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 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/.

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Fig. 10 — Scanning electron micrographs (SEM) of the colorectum of a quail embryo at day 17 of incubation. Images B, C, E, F, H and I were details of images A, D and G. The rectal wall (W), lumen (L), villi (V), muscular layer (ML), circular muscle layer (CL), serosa (SL), villi neck (Ne) goblet opening (g), honey-comb shaped arrangement of enterocytes (star), villi with losing tips (Vt), mucous secretion (mu), epithelium (ep), goblet cells (gc), lamina propria (lp), and enterocytes (en)