Effect of cytochalasin B (5 μmol/L) incubation on the release of NO from human PMN, assessed with the HbO₂ method as detailed in Materials and Methods, activated with LTB₄(100 nmol/L) and measured 1, 5, 10, and 30 minutes after stimulation. Mean ± SEM; n = 3. * .01 < P < .05; **P < .01 compared with identical samples with cytochalasin B present.