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PCR amplification of a ctx allele from K. pneumoniae subsp. pneumoniae isolate K01 from this study. Lane 1: 1 kb Ladder plus (Invitrogen). Lane 2: K01. Lane 3: ESBL-negative E. coli strain 042. Lane 4: No template. Marker size fragments are indicated to the left of the gel in Kilobase pairs. In the absence of a positive control, the identity of the band amplified from strain K01 was determined by sequencing.
