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. 1998 Jul 1;188(1):49–60. doi: 10.1084/jem.188.1.49

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Infection of HL-60 cells with L. pneumophila. After 2 h coincubation of host cells and bacteria, extracellularly remaining bacteria were killed by gentamicin. The CFU determined at day 0 therefore represent intracellular bacteria. (Circles) Wild-type RC1; (triangles) mutant 811; (squares) 811-rev. CFU are shown as mean of duplicates.