Crossword Genius

Unwritten code? (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" , "Substance in chromosomes that stores genetic data" , "Deoxyribonucleic acid (abbreviation)" , "Genetic carrier" , "Substance in chromosomes that stores genetic information, used by police" .)

I've seen this clue in The New York Times.
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