Crossword Genius

Genome molecule (3)

Ross

I believe the answer is:

dna

(Other definitions for dna that I've seen before include "Substance that stores genetic information - often used by police" , "It carries genetic information" , "Deoxyribonucleic acid (abbreviation)" , "Briefly, substance in chromosomes used by police to identify criminals" , "Bodily substance that stores genetic information - police use it to identify" .)

I've seen this clue in the Universal.
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