130 characters: 
$_="KNNKtIIIMRSSRQHHQplr.YY.sLFFL.CCWEDDEavg";s/[a-z]/uc$&x4/eg;@x=/./
+g;join"",@x[map{$x=0;$x=$x*4|6&ord for/./g;$x/2}pop=~/.../g]

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In reply to Re: (Golf) RNA Genetic Code Translator by no_slogan
in thread (Golf) RNA Genetic Code Translator by tadman

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