FIG. 3.

Cell-cell aggregation in strain ATCC 14028 and ΔagfA cultures. S. enterica serovar Typhimurium strain ATCC 14028 (ST 14028) and ΔagfA cultures were analyzed by differential interference contrast microscopy after growth in LBns for 6 h (A) or in 1/10 LBns-Dp for 48 h (B) at 28°C without agitation. Pictures in the top and bottom panels in panel B were taken from the same cultures. A₆₀₀ values were 0.208 (A) and 0.229 (B) for strain ATCC 14028 cultures and 0.288 (A and B) for ΔagfA cultures. Each picture was magnified 40,000×. Dp, 2,2′-dipyridyl.