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(A) Structure of atypical class 1 integrons found frequently in Australia. A characteristic 848 base-pair long PCR amplicon spanning intI1and IS26 is generated when this structure occurs. The IS26 can be part of composite transposons Tn6026 or Tn6029 (detailed in the inset). (B) Structures found in MDR strains overseas (see Table 1).
