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Dermal residue

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Dermal residue was small amounts of skin found on an item by an individual after contact.

In 2370, Jadzia Dax found dermal residue on the back of a Bajoran warring allegedly worn by Li Nalas. A genetic analysis of the residue confirmed the presence of Li's DNA, which was stored on records, making the earring genuine. (DS9: "The Homecoming")

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