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Bacterial adhesion to ARPE-19 cells. Adhesion of T4R or isogenic mutants ΔSpxB, ΔAdcAII, ΔPhtD, ΔSP1954, or ΔCbpl was assessed after 30 min incubation with ARPE-19 cells. Colony forming units (CFU's) are expressed as percent adhesion compared to wild type T4R. Asterisk indicates statistical significance as determined by Student's t-test comparison of each mutant to T4R. (p<0.01).
