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Action potentials persisted in the presence of NBQX. A: spontaneous excitatory postsynaptic currents (EPSCs) in a PZ calyx (top) were eliminated in the presence of 20 μM NBQX (bottom), which blocks postsynaptic AMPA receptors. Holding potential was −79 mV. B: NBQX did not abolish firing (different PZ calyx than in A).
