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Identification of single corticospinal axons from pyramidal tract (PT) stimulation. Latency data from all three animals (112 axons; 19, 68, and 25 from CS23, CS22, and CS15, respectively). Inset: five superimposed sweeps of a single-spike response to PT stimulation at 400 μA for axon CS22a39. PT stimulus onset was at downward inflexion. Latency was measured at the peak of the spike.
