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exactly. from the little i know about chemistry tests, most of them are done blending stuff and adding some reagent and see if that changes color or something else that is measurable.

I have no idea how they 'check' dna pairs, but i doubt they compare every subtlety of the molecules every time. If they do, wow! but still, we may not be able to accurately detect something else that is even smaller. since we only saw dna recently. the wikipedia article has dozens of diagrams, but only one blurry 100nm image, from 2004.


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