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A polymerase that acts on a template DNA strand to produce RNA, resulting in the formation of an RNA primer needed in RNA replication.
[primer + -ase]
primasean ENZYME that synthesizes RNA PRIMERS during DNA replication in bacteria and certain single-stranded DNA phages. The RNA primers can then be extended by DNA POLYMERASE (see DNA (b) REPLICATION).
a specialized RNA polymerase that synthesizes short stretches of RNA used as primers.