IL1B and ischemic stroke: Serum IL-1β was almost undetectable, and we observed no significant difference in IL-1β levels between controls (< 0.000001 pg/ml [< 0.000001;< 0.000001]) and ischemic stroke patients when serum was sampled either < 8 h (< 0.000001 pg/ml [< 0.000001;0.00016]) or 72 h after the vascular event (0.0013 pg/ml [< 0.000001;0.005]) (p = 0.47) (Fig. 2q).