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J Bacteriol. 1991 April; 173(8): 2707–2709.
PMCID: PMC207841

Nomenclature relating to restriction of modified DNA in Escherichia coli.


At least three restriction systems that attack DNA containing naturally modified bases have been found in common Escherichia coli K-12 strains. These systems are McrA, McrBC, and Mrr. A brief summary of the genetic and phenotypic properties so far observed in laboratory strains is set forth, together with a proposed nomenclature for describing these properties.

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