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Screen for restoration of swimming motility in transposon mutants of E. coli CFT073 constitutively expressing type 1 fimbriae (fim L-ON). Motilities of the WT, fim L-ON, and a representative motile transposon mutant of fim L-ON (fim L-ON mutS::Tn5) in soft agar are shown. White bars indicate the diameter of motility of each strain (WT, 44 mm; fim L-ON, 10 mm; fim L-ON mutS::Tn5, 25 mm).
