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Mobile integrons contain cassettes encoding varied functions. (A) Distribution of resistance cassettes found in mobile integrons in the Integrall database (QACs: quaternary ammonium compounds; Cm: chloramphenicol). (B) Distribution of functions encoded in cassettes in first position of class 1 integrons in Integrall. (C) Diagram of pMBA vector used to analyse cassette expression by fusing 5′UTRs to a GFP encoding gene. Not to scale.
