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The RNA polymerases are huge multi-subunit protein complexes. Three kinds are found in eukaryotes: * RNA polymerase I (Pol I).

It transcribes the rRNA genes for the precursor of the 28S, 18S, and 5.8S molecules (and is the busiest of the RNA polymerases). * RNA polymerase II (Pol II; also known as RNAP II).

It transcribes protein-encoding genes into mRNA (and also the snRNA genes). * RNA polymerase III (Pol III).

It transcribes the 5S rRNA genes and all the tRNAgenes.

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