Phase variation Site specific Inversion
Phase and Antigenic Variation in Bacteria. pA is the promoter for FimA, pB is the promoter for FimB and pE is the promoter for FimE. IRR is inverted repeat right and IRL is inverted repeat left. FimB and FimE are recombinases that can change the orientation of the FimA promoter by inverting the IRR and IRL.
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