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Colony morphologies of strains FA1090, the mpg (Δ1686) mutant, and nonpiliated (P−) derivatives. (A) FA1090; (B) mpg mutant. Arrows indicate colonies with P− morphologies among P+ colonies. The more P+ colonies of the mpg strain show a colony morphology intermediate between those of FA1090 P+ and FA1090 P−. Representative stereomicroscope images of strains after 24 h of growth on solid media (bars, 1 mm). Smaller colonies can appear with both strains for unknown reasons.
