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Differences between pSN254 and pSN254b (A) Putative composite transposon. The genes and the IS in the box are present in the pSN254 of S. enterica but are absent from the pSN254b of A. salmonicida subsp. salmonicida. (B) Transposon Tn21. The genes and the IS in the boxes are present in the pSN254 of S. enterica but are absent from the pSN254b of A. salmonicida subsp. salmonicida. Light gray arrows indicate genes coding for antibiotic and mercury resistance.
