Genetic molecule (3)

I believe the answer is:

dna

(Other definitions for dna that I've seen before include "Genetic carrier" , "Genetic material often used by police" , "Substance in chromosomes that stores genetic data" , "Briefly, substance in chromosomes used by police to identify criminals" , "Substance that stores genetic information in body" .)

I've seen this clue in the Newsday, the LA Times, the Universal and the USA Today.

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