Effect of fMLP on adhesion molecule expression on neutrophils. Neutrophils were incubated with different concentrations of fMLP for 5 minutes at 37°C and surface marker expression was determined using flow cytometry. The mean fluorescence is given as a measure for expression of L-selectin (○), CD11b (•), and CD18 (▪) on the neutrophil surface. The mean values ± SE of four experiments are given. *A significant effect of fMLP activation was determined by repeated measures ANOVA (P < .05).