Crossword Genius

Genetic letters (3)

Ross

I believe the answer is:

rna

'genetic letters' 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 LA Times, the Penny Press and the King Feature Syndicate.
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