Fig. (4) Migration of mutant strains on soft agar. KV6576 (A), KV7432 (B), and KV7433 (C) were grown overnight in LBS. Cultures were diluted to an OD₆₀₀ of 0.4 prior to inoculation on TB-SW motility medium containing or lacking 1.75 mM IPTG. The images depict migration after 5.5 h of incubation at 28°C.