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Motility mutants were identified by the use of several screens. Cells from overnight broth cultures were used to inoculate swim-migration plates as described in Materials and Methods. All motility plates were incubated at 28°C for 24 h and screened for motility mutants. (A) Nonmotile mutant; (B) reduced-swimming-motility mutant; (C) hyperswimmer mutant; (D) mutant capable of swimming in medium without NaCl; (E) hyperswarmer mutant.
