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Effect of SPEP on cell proliferation. Osteoblasts were incubated with S. aureus strains pretreated or untreated with SPEP. Proliferation was determined by a colorimetric MTT assay (OD at 560 nm) after 24 h of culture of infected and uninfected cells. Results were expressed as percentages of values normalized with control (100%). The control represents the cells incubated with medium alone. Data are represented as the means and standard deviations of three independent experiments.
