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. 2022 Jan 21;8:816422. doi: 10.3389/fmed.2021.816422

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Copyright © 2022 Feng, Li, Li, Jin, Du and Chen.

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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Histopathological pictures of gut inflammation among SpA patients. (A) Histologically infiltration of Inflammatory cells was around gland duct (small arrow) and at underlying submucosa (bold arrow) located in terminal ileum (H&E; original magnification ×10). (B) Multiple ectopic lymphoid tissues were microscopically observed in the terminal ileum (long arrow) with massive infiltration of inflammatory cells around gland duct (H&E; original magnification ×10). (C) Tissue specimen from descending colon demonstrated moderate infiltration of inflammatory cells around gland duct (small arrow) and in the underlying submucosa (bold arrow) (H&E; original magnification ×20). (D) A ectopic lymphoid tissue was microscopically observed at rectum specimen (long arrow) with massive infiltration of inflammatory cells around gland duct (H&E; original magnification ×20).