Crossword Genius

Paternity proof, in brief (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" , "Initially, it stores genetic information" , "Genetic-code molecule" , "Double-helix molecule (abbr.)" , "Briefly, substance in chromosomes used by police to identify criminals" .)

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