Figure 2. Differential sensitivity of a neuronal acetylcholine receptor (alpha⁴beta²subunits) and the muscle receptor (alpha beta gamma delta subunits) to halothane. (Top) Neuronal receptor. The effect of 17.5 micro Meter halothane on acetylcholine-induced currents (160 micro Meter acetylcholine, closed square). (Bottom) Muscle receptor. The effect of 175 micro Meter halothane on acetylcholine-induced currents (10 micro Meter acetylcholine, closed square). Oocytes were voltage-clamped at -60 mV.