Role of neutrophils in light/dye–induced thrombus formation in cerebral vessels. Neutropenia was produced by administering ANS 24 hours before induction of thrombus formation in cerebral venules (A) and arterioles (B) of WT and β^s mice. Data are shown as the means ± SEM. *P < .05 compared with the corresponding controls (WT→WT or β^s→WT). n = 5-6 mice/group.