Figure 3. Responses of an individual cell to repeated clamping. The clamp was applied at the 60-s mark for 10 s. Twelve responses are shown, with three responses determined at 1.4% and 1.2% each, and repeated. The MAC in this animal was 1.3%. The interval between clamp applications was >or= to 5 min, and the interval between different anesthetic concentrations was >or= to 15 min.