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Electron microscopic examination of expression of pili by L. pneumophila AA100. L. pneumophila wild-type strain AA100 expresses short (0.1 to 0.6 μm) (A) and long (0.8 to 1.5 μm) (B) pili. Pili are indicated by small arrowheads. Flagella are noticeably thicker than the pili observed and are indicated by large arrowheads. Bars, 0.5 μm.
