Fig. 2. Xe treatment duration analysis. Rats were randomly exposed to 30% Xe (in 30% O2/balance nitrogen) for 0, 8, 20, or 44 h, beginning 90 min after reperfusion from 70-min awake middle cerebral artery occlusion. A 7-day recovery interval was allowed. Open circles indicate individual animal values. Horizontal lines indicate mean values for (A ) neurologic score and (B ) total, (C ) cortical, and (D ) subcortical infarct sizes. For neurologic scores, 0 = no neurologic deficit (potential range 0–48). P values indicate main effect. P values = one-way ANOVA main effect for each analysis. *P < 0.05 versus 0 h Xe. Xe = Xenon.