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Inhibition of monocyte migration in response to cathepsin G (5 μg/ml, chemotaxis index [c.i.] 3.9) by pertussis toxin. Monocytes were treated with pertussis toxin for 30 min at 37°C before chemotaxis assay. The results are expressed as the c.i., *P <0.05; **P <0.01. FMLP (10 nM) is included as a positive control (c.i. 7.4).
