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BL21(DE3)

F¨C ompT gal dcm lon hsdSB(rB- mB-) ¦Ë(DE3 [lacI lacUV5-T7 gene 1 ind1 sam7 nin5])

    an E. coli B strain with DE3, a ¦Ë prophage carrying the T7 RNA polymerase gene and lacIq
    Transformed plasmids containing T7 promoter driven expression are repressed until IPTG induction of T7 RNA polymerase from a lac promoter.
    Derived from B834 (Wood, 1966) by transducing to Met+.
    See the original Studier paper or the summary in Methods in Enzymology for more details.
    Whole genome sequence available [3]
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