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Schematic representation of mexAB-oprM operon regulation by C4-HSL, MexR (R), and MexT. Symbols: double circles, high-level expression; open circles, low-level expression; open triangles, very low-level expression; ×, no expression or no function; ⊢, repression. Thick and thin arrows represent high and low expression or effect, respectively. Arrows with question marks indicate deduced regulatory pathways.
