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. 2016 Apr 29;44(10):4539–4550. doi: 10.1093/nar/gkw319

Figure 1.

Figure 1.

Schema of an integron and the three types of elements detected by IntegronFinder. (A) The integron is composed of a specific integron integrase gene (intI, orange), an attI recombination site (red), and an array of gene cassettes (blue, yellow and green). A cassette is typically composed of an ORF flanked by two attC recombination sites. The integron integrase has its own promoter (PintI). There is one constitutive promoter (Pc) for the cluster of cassettes. Cassettes rarely contain promoters. The integrase can excise a cassette Inline graphic and/or integrate it at the attI site Inline graphic. (B) Complete integrons include an integrase and at least one attC site. (C) The In0 elements are composed of an integron integrase and no attC sites. (D) The clusters of attC sites lacking integron-integrases (CALIN) are composed of at least two attC sites.