You have probably performed a sandwich assay before, even if you didn't know it. Sandwich assays are the molecular sensing technology behind lateral flow tests like the at-home COVID test. After a sample is dripped onto the test strip, it combines with detector antibodies attached to tiny gold ...

Source: [Phys.org](https://phys.org/news/2026-11-paired-dna-strands-sequence-small.html)

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