Fig. 3.
The scrp31 mutation suppresses the swimming and swarming deficiency phenotypes of a crp mutant strain. A. Swimming motility charted as a function of time. The crp scrp31 double mutant is able to swim, whereas the crp mutant strain is non-motile. B. Genetic map of the flhDC locus with the location of a predicted CRP binding site (black box with asterisk) and the location of a transposon insertion (scrp31), not drawn to scale. The transposon bears a Ptac promoter, which is directed toward the flhDC operon.