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PCR detection of the carbapenem-resistant gene blaNDM-1 and the colistin-resistant gene mcr-1 from (A) the plasmids extracted from the eight carbapenem-resistant and (B) the colistin-resistant E. coli strains. M: DL 2000 DNA marker; 1–8: plasmid from RXD007, RXD012, RXD020, RXD024, RXD033, RXD035, RXD100, and RXD115; 9: ddH2O as negative control.
