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Influence of serum on the antibacterial activity of neutrophil secretions in a radial diffusion assay. N+S+P, neutrophils were stimulated by PMA (100 ng/ml) in the presence or absence of serum; S, serum only, diluted in PBS; (N+P)+S, serum was added into neutrophil secretions after neutrophils were removed. Symbols: •, E. coli; ▴, L. monocytogenes. Data are means ± standard deviations from assays performed twice in duplicate.
