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Schematic representation of the structure of Tn7::In2-8. a) The attI2 site is indicated as shown, and the ovals represent the attC sites of the gene cassettes. All intI2 genes sequenced so far reveal an internal stop codon. b) Nucleotide sequence of catB2 pseudocassette and comparison of this sequence with the attC site of the catB2 cassette (accession number AJ487034) and the 5′CS region of the class 2 integron (accession number NC_002525).
