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. 2024 Aug 27;16(8):2555–2564. doi: 10.4240/wjgs.v16.i8.2555

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©The Author(s) 2024. Published by Baishideng Publishing Group Inc. All rights reserved.

This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial.

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Immunohistochemical staining of transmembrane serine protease 4 in biliary tract cancer. A: Transmembrane serine protease 4 (TMPRSS4)-positive biliary tract cancer (BTC) tissues; B: TMPRSS4-positive BTC tissues; C: TMPRSS4-negative BTC tissues; D: TMPRSS4-negative BTC tissues. Original magnification: 40 × (A and C); 400 × (B and D).