Crossword Genius

Intrinsic makeup (3)

Ross

I believe the answer is:

dna

(Other definitions for dna that I've seen before include "Bodily substance that stores genetic information - police use it to identify" , "Double-helix molecule (abbr.)" , "Initially, it stores genetic information" , "Genetic material often used by police" , "Genetic profile" .)

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