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Genetic environment of blaCTX-M and blaCMY-2 groups among E. coli ST131 isolates. A dotted line in a gene box indicates truncation. IRR, right-hand inverted repeat; IRL, left-hand inverted repeat; DR, direct repeat of partial ISEcp1 inverted repeat; *, shortened spacer (32 bp) in variant 1c3; white triangle, IS26 inverted repeat; black triangle, ISEcp1 inverted repeat. aNovel genetic environment structure found in this study (no identical sequence was deposited in GenBank).
