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DNA from representative plasmids restricted with the MluI restriction endonuclease on a 0.6% agarose gel (A). Southern blots, prepared from panel A, show the DNA fragments from representative plasmids which hybridized to the TEM-1 β-lactamase gene probe (B), the type VII DHFR oligonucleotide probe (C), and the CAT-I oligonucleotide probe (D). Lanes: 1, plasmid group A; 2, plasmid group B; 3, plasmid group D; 4, plasmid group C.
