Crossword Genius

Lab macromolecule (3)

Ross

I believe the answer is:

dna

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

I've seen this clue in the Newsday.
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