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(A) Schematic illustration of CRISPR-Cas12a coupled with gold nanoparticle strand displacement probe for rapid and sensitive visual SARS-CoV-2 detection. Reproduced with permission from [100]. Copyright 2023, Elsevier. (B) Schematic representation of the preparation of sensing systems for colorimetric and electrochemical detections of chromium ions in water. Reproduced with permission from [105]. Copyright 2021, Elsevier.
