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We present here the complete genomic sequence of a rifampin-resistant derivative of the Escherichia coli K-12 laboratory strain ER1821, engineered to be deficient in all known restriction systems, making it suitable for generating unbiased libraries from organisms with non-K-12 methylation patterns. The ER1821R genome is most closely related to that of DH1, another popular cloning strain (both derived from MM294), but is deleted for the e14 prophage (McrA(-)) and the immigration control (McrBC(-) EcoKI R(-) M(-) Mrr(-)) loci.

genome announcements

Complete Genome Sequence of <i>Escherichia coli</i> ER1821R, a Laboratory K-12 Derivative Engineered To Be Deficient in All Methylcytosine and Methyladenine Restriction Systems

Complete Genome Sequence of Escherichia coli ER1821R, a Laboratory K-12 Derivative Engineered To Be Deficient in All Methylcytosine and Methyladenine Restriction Systems