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Schematic representation of a class 1 integron. The basic integron platform consists of the following: intI, a gene for the integron integrase; Pc, an integron-carried promoter; attI, the integron-associated recombination site; and gene cassettes, sequentially inserted into an array via recombination between attI and the cassette associated-recombination sites, attC (Gillings, 2014; Ghaly et al., 2020a).
