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Plasmid agarose gel electrophoresis and Southern hybridization of DHA-1-producing isolates. Lane V517, plasmid size standards from E. coli strain V517 (18); lanes 9 to 57, DHA-1-producing plasmids from the isolates corresponding to the isolate numbers listed in Table 5; lane P, plasmid from K. pneumoniae 502321.
