Serotonergic synaptic currents evoked by electrical stimulation. A, Evoked serotonergic responses recorded at different holding potentials from a layer 5 pyramidal neuron (D). B,I–V plot of evoked serotonergic PSCs shown in A. Peak currents were measured to generate theI–V plot. C, Electrically evoked serotonergic responses were also suppressed by ICS 205-930.