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. 2021 Feb 25;12:627499. doi: 10.3389/fphys.2021.627499

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Copyright © 2021 Kord, Srour, Omar, Farag, Nour and Khalil.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Histological section of Intestinal tract of Nile tilapia, O. niloticus fed Control (A) showing normal length of intestinal villi and crypt (H&E × 20), Yeast Plus^® (B) showing in length of villi and mucosal folds and high number of intestinal crypt (Arrow), Sanolife PRO-F^® (C) showing increase of the mucosal folds and high numbers of goblet cells as well as increase in length of intestinal villi and high number of intestinal crypt (Arrow), Biotronic^® Top³ (D) and Digestarom^® (E) showing slight activation of goblet cells in the lamina propria and slight increase length of intestine villi (Arrows) (H&E × 20).