Intracerebroventricular administration of the MEK inhibitor U0126 promotes functional recovery after ICH in mice. A, ICH and sham animals received intracerebroventricular injections of 12 µg U0126 or vehicle at 2 h after ICH surgery, and the functional recovery (adhesive tape removal and corner task) was assessed up to 7 d after ICH. Values show mean ± SD for adhesive tape removal and median for corner task; *p < 0.05 versus baseline, #p < 0.05 versus ICH+vehicle. B, The indirect hematoma volume and hemispheric swelling (edema) were measured at 24 h after ICH. The values show the mean ± SD for hematoma volume and the median for hemispheric swelling. C, D, Neuronal cell survival was assessed using Fluoro-jade B staining in the perihematoma (C) and NeuN immunofluorescence in the cortex and striatum (D) at 24 h after ICH. Scale bar: 100 µm. Mean ± SD is shown. *p < 0.05. For exact p values, refer to Extended Data Figure 1-3.