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Epiretinal stimulation with cathodic pulses evoke transient inward currents in a retinal ganglion cell (left trace). Transient inward currents (arrow) were not affected by blockade of synaptic transmission with Cd2+ (0.1 mM, middle trace). Wash of Cd2+ did not change these evoked currents (right trace). Stimulus markers are shown at the bottom of each trace. Pulse duration, 12.5 milliseconds. Pulse amplitude, 25 μA.
