Fig. 3. Strain differences in MAC levels for halothane. Significantly smaller mean (± SD) end-tidal halothane were required to eliminate movement response to tail clamp in Dahl Salt Sensitive rats (SS) and SS.BN.16 consomics compared with Brown Norway (BN) and SS.BN.13 animals. There were no differences between SS  versus SS.BN.16 or between BN  versus SS.BN.13. *  P ≤ 0.05  versus BN and SS.BN.13, pooled (spontaneous and controlled ventilation); n = 20–22 for each group.