IL1B and ischemic stroke: Compared with the young mice, the old mice had higher IL-1β and IL-6 protein levels at both 1 day (old vs. young IL-6: 308±152 pg/mg vs. 147±44, p=0.03; IL-1β: 96±35 vs. 55±8 pg/mg, p=0.0008) and 3 days (IL-6: 149±53 vs. 90±27, p=0.04; IL-1β: 61±17 vs. 54±8, p=0.02; old vs. young) after ischemic stroke (Fig. 3B).