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Intracellular persistence of bacteria within HeLa cells as a measure of intracellular survival and/or replication, according to the protocol of Anderson et al. (2), and expressed as percentages of that for wild-type EPEC or S. flexneri (S.flex). The plasmid-free variant of S. flexneri (S.flex-pInv) was used as a negative control. Relative scores are above the bars.
