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Fig. 1.

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Fig. 1. Schematics of lateral flow assays. A. Sandwich type. B. Competitive type. In (A), the antigen-labeled antibody conjugations are captured at detection antibodies at the test zone in the presence of the target antigens, thereby both lines are visible. In (B), when the antigens are immobilized at the test zone, the test zone is invisible by target analyte-labeled antibody conjugations. When the antibodies are immobilized at the test zone, it is also invisible by the binding of the target analytes, which are not labeled.
J. Microbiol. Biotechnol. 2023;33:559~573 https://doi.org/10.4014/jmb.2212.12025
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