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A series of cellular traces with increasing stimulus strength and fixed duration of 0.2 ms. Action potentials (APs) were elicited for stimulus current (I) from 5 to 13 μA and in about one-half of all sweeps for I = 3 and 18 μA; APs could not be elicited below I = 2 μA and above I = 22 μA. Inset at right illustrates a spontaneous AP, for comparison.
