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Intracellular growth of wild-type and nonhemolytic strains of L. monocytogenes in HBMEC. HBMEC were infected with L. monocytogenes 10403S (WT) and isogenic L. monocytogenes DP-L2161 (Δhly) (MOI = 5) as described in Materials and Methods, and the intracellular growth was monitored over a period of 18 h.
