How do bacteria that produce restriction enzymes protect their own DNA from the nuclease activity of these restriction enzymes?

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Bacteria that produce restriction enzymes protect their own DNA from the nuclease activity of these enzymes by adding methyl groups to their DNA. The restriction enzymes recognize and cut at specific DNA sequences that lack these methyl groups. By adding methyl groups to their own DNA, the bacterial cells prevent their own DNA from being cut by their own restriction enzymes.

How Do Bacteria That Produce Restriction Enzymes Protect Their Own