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Photographs of L-agar plates containing colonies of P. aeruginosa strains that formed after 24 h at 37°C. Note that in an Alg+ strain (FRD1) background, a nonpolar algKΔ::Gmr mutation (strain FRD1100) resulted in Alg− and small-colony (i.e., sick) phenotypes. These phenotypes could be suppressed with a polar algJ::Tn501-3 mutation (strain FRD1105). (A) algKΔ mutant FRD1100. (B) algKΔ algJ::Tn501-3 mutant FRD1105.
