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The clustered regularly interspaced short palindromic repeats (CRISPR)-associated nuclease 9 (Cas9)-based genome editing tool pCas/pTargetF system that we established previously has been widely used in Escherichia coli MG1655. However, this system failed to manipulate the genome of E. coli BL21(DE3), owing to the potential higher leaky transcription of the gRNA-pMB1 specific to pTargetF in this strain. In this study, we modified the pCas/pTargetF system by replacing the promoter of gRNA-pMB1 with a tightly regulated promoter PrhaB, chan
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