Genetic material: Abbr.

I think it could be either:

Which length description are you looking for?:

dna

(Other definitions for dna that I've seen before include "Double-helix molecule (abbr.)" , "Substance that stores genetic information - often used by police" , "Genetic carrier" , "Briefly, substance in chromosomes used by police to identify criminals" , "Deoxyribonucleic acid (abbreviation)" .)

I've seen this clue in the Canadiana.

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