Genetic letters (3)
I believe the answer is:
rna
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">genetic letters</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Another definition for rna that I've seen is " Messenger".)
I've seen this clue in the King Feature Syndicate, the LA Times, The Wall Street Journal, the USA Today and the Penny Press.
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