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Graphical representation of the number of CRISPR repeats for strains harboring 0, 1, 2, 3 or 4 UPEC factors for the whole set of N = 126 strains (A) or the 71 strains with the intact set of cas I-E genes (B). Dotted lines represent the least-square linear regressions, and their corresponding R2 values are indicated.
