FIG. 3.

Mutational analysis of the 5-bp element. Developmental lacZ expression was measured for M. xanthus strains with a multiple-base-pair mutation in the 5-bp element of the fruA promoter region (○) or a single-base-pair change of C to A at −61 bp (▪). The wild-type fruA promoter region from −185 to +50 bp (•) and the vector with no insert (▴) were included as controls. The meaning of points and error bars is the same as is described in the legend to Fig. 1.