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Promega µÃBL21 cell£¬ discription ÕâÑù˵£ºBl21(DE3)pLysS can be used with
protein expression vectors that are under the control of the T7 promoter, such
as pET vectorers. This strain is lysogenic for lambda-DE3(4), which contains
the T7 bacteriophage gene1, encoding T7 RNA polymerase under the control of
the lac UV5 promoter. BL21(DE3) pLysS also contains the pLysS palsmid, which
carries the gene encoding T7 lysozyme. T7 lysozyme lowers the background
expression level of target genes under the control of the T7 promoter but does
not inerfere with the level of expression achieved following induction with
IPTG.
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