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. 2025 Dec 10;22:24. doi: 10.1186/s12917-025-05164-2

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© The Author(s) 2025

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, 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 you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. 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-nc-nd/4.0/.

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Fig. 4 — Identification of linear epitope that can be recognized by mAb 1A2 and 7H10 (A) schematic diagram of the design of truncated gene fragments spanning the NSP4-ΔHR protein and the position of the identified epitope. mAb 7H10 and 1A2 recognized specific regions (red lines), while black fragments did not react. B SDS-PAGE analysis of truncated NSP4-ΔHR segments expression. C and D Western blot analysis of the reactivity between the NSP4-ΔHR protein fragments and mAbs. mAb 7H10 recognized segments P4-4 and P4-5 (C), while 1A2 recognized segment p4-5 (D)