Fig. 7. Effect of dnqx on excitation of cell Tr1 by n cell. Control: In high divalent saline one N cell action potential evokes a single EPSP in cell Tr1. DNQX: Averaged N cell impulses continue to trigger monosynaptic events in cell Tr1 in a one-to one manner, after bathing the nerve cord in 400 mM DNQX for 30 min. Each trace represents 10 averaged signals. Stimulus artifacts were reduced from N cell data for clarity. CALIBRATION: 20 mV (N cell) and 1 mV (cell Tr1), 100 ms.