Aggregation phenotypes of Mx4885 mutants. The strains indicated above the images were starved on CF agar plates for 24 h before photography. The strains used were DK1622 (wild type), DK12702 (Mx4885::Km), DK12703 (ΔMx488548–426), DK12704 (ΔMx488548–123), DK12705 (Mx4885::Km, attB::pJEL4885.11), and DK12706 (Mx4885::Km, attB::pSWU30). (Scale bar, 0.5 mm.)