The Restriction modification system reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Restriction modification system

The restriction modification system is used by prokaryotic organisms (ie. bacteria) to protect themselves from foreign DNA such as bacteriophage. Restriction enzymes have specificity for non-methylated DNA sequences which are recognized and cleaved at sequence specific sites by restriction enzymes.

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