Crossword Genius

Genetic material (3)

Ross

I think it could be either:

rna

dna

'genetic material' is the definition.
(I've seen this in another clue)

This is all the clue.

(Another definition for rna that I've seen is " Messenger".)

I've seen this clue in The Wall Street Journal, the USA Today, the Newsday, The New York Times, the Universal, the Sydney Morning Herald and the LA Times.
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