Dose response inhibition of fMLP and IL-8 induced PMN chemotaxis. Approximately 12,000 cells per channel were pre-treated with the indicated amount of inhibitor in the plate for 30 min. After adding the indicated chemoattractant (200 nM fMLP or 62 nM IL-8), the plate was incubated for 2.5h. The graph shows the mean and standard deviation for replicates of 4.