Missed a paren... 
for ( unpack("(A3)*",$rna)) {
   if (exists($gencode{$_})) {
       $protein.=$gencode{$_};
   } else {
       die "No mapping for [$_]\n";
   }
}

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In reply to Re^2: Keeping track of substituted regions with a while loop by kschwab
in thread [SOLVED] Keeping track of substituted regions with a while loop by enderk

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