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What is the smallest animal with eyes and could it see a molecule?

Eric Kvaalen, Les Essarts-le-Roi, France

I think it is possible for us humans to see a single molecule.

There is a with fluorescent labels, then a microscope is used to see whether different molecules occur in the same place.

If the illuminating light is strong enough, I suppose it would be possible to see a dot of fluorescence at the location of one of the labelled molecules, even without a microscope.

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