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Poly(A) polymerases were identified almost 50 years ago as enzymes that add multiple AMP residues to the 3′ ends of primer RNAs without use of a template from ATP as cosubstrate and with release of pyrophosphate. Based on sequence homology of a signature motif in the catalytic domain, poly(A) polymerases were later found to belong to a superfamily of nucleotidyl transferases acting on a very diverse...
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