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An enzyme that catalyzes the stepwise addition of ribonucleotides to the 3\' end of a growing RNA chain using a single-stranded DNA template. This reaction, transcription, is important in the flow of information from DNA to proteins. Three different polymerase protein complexes have been identified and characterized.
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RNA polymerases comprise a group of enzymes that catalyze extension, one nucleotide at a time, of the 3 prime-end of an RNA strand along a complementary DNA template.
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