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(A) PFGE of cefotaxime-resistant and -susceptible S. typhimurium isolates. The sizes (in kilobase pairs) of bacteriophage λ concatamers are indicated on the right. All lanes are from the same gel. (B) Dendrogram based on the similarity of the PFGE patterns shown in panel A. Isolates are indicated on the right, and a percentage similarity scale is shown at the top.
