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Molecular comparison of blaOXA-18-producing P. aeruginosa isolates. (A and B) PFGE with SpeI-restricted DNA (A) and blaOXA-18 hybridization of the SpeI PFGE gel (B). Lane 1, P. aeruginosa MUS; lane 2, P. aeruginosa 1-63; lane 3, P. aeruginosa 1-22; lane 4, P. aeruginosa 1-52. Molecular weight markers (lane M) correspond to the lambda ladder (Bio-Rad). The arrow indicates the 200-kb band that hybridizes with the OXA-18 specific probe.
