Crossword Genius

The "code" in Walter Isaacson's best-selling 2021 book "The Code Breaker" (3)

Ross

I believe the answer is:

dna

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

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