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. 2022 Oct 27;13(11):1835. doi: 10.3390/mi13111835

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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Paper chip for marker detection by colorimetry. (a) Chromogenic method in lateral flow analysis to achieve colloidal gold immunochromatography [64]; (b) the principle of color-changing methods of the analyte [72].