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Effect of propofol on survival as a function of time. Each group started with 16 rats. The carisoprodol group was selected to act as a control because it was being trained at approximately the same time and because carisoprodol is suspended in the same vehicle as propofol (2% methylcellulose). The arrow indicates when the Propofol 5 mg/kg group was switched to 10 mg/kg.
