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One role of RNAi in eukaryotes is to perform immune functions by disrupting certain viral genomes....

One role of RNAi in eukaryotes is to perform immune functions by disrupting certain viral genomes. What "system" do prokaryotes use instead and how does it function?

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The prokaryotes use RNA based system which shows some resemblance to the eukaryotic RNAi. The genes of RNA encoding is responsible for controlling the large presence of mRNA by generating a complementary RNA which tempers to mRNA. These are regulatory RNA's and are not matching with the miRNA's due to the lack of the enzyme dicer. The prokaryotic CRISPR interference systems matches with the RNA interference system of eukaryotes.

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