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Gel electrophoresis (A) and Southern hybridization (B) of plasmid DNA preparations. Lanes: 1, E. coli 1-12; 2, E. cloacae 1-26; 3, K. pneumoniae 4-38; and 4, E. coli 4-67. Upper arrow indicates plasmid DNA; lower arrow indicates the location of chromosomal DNA and/or sheared plasmid DNA.
