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Southern blot hybridization of the PFGE gel with a specific blaNDM-1 probe. The black arrows indicate positive signals with the NDM-1 probe in each E. coli clinical isolate and its corresponding transformant. Lanes 1 to 8, PN1, PN1 TF1, PN7, PN7 TF1, PN14, PN14 TF1, PN18, and PN18 TF1, respectively.
