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Proliferation of peripheral blood mononuclear cells (PBMCs) stimulated by different concentrations of recombinant Staphylococcal enterotoxin A–epidermal growth factor (rSEA-EGF). Cells were incubated in the presence of different concentrations of rSEA-EGF (1 pg/mL-1 μg/mL) for 7 days at 37°C in 5% CO2. MTS reagent was added for the last 4 hours of the 7-day incubation. **P < .01, ***P < .001, the rSEA-EGF-stimulated human PBMCs compared with the negative control (PBS).
