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Electron micrographs of wild-type (A) and flaA1 mutant (B) strains obtained with 1% uranyl acetate staining. The sheathed unipolar flagella were easily detected in the wild-type strain as well as in the wbpB mutant (data not shown), but the flaA1 mutants were devoid of flagella. Bar, 0.5 μm.
