Figure 7.

Effects of 4-AP (5 mmol/L), TEA (50 mmol/L) and charybdotoxin (250 nmol/L) on spontaneous action potentials of the RP4 neuron. A and B, C, and D, E, and F were recorded from 3 different RP4 neurons. A, C, and E: Control; the spontaneous action potentials of the RP4 neuron. B, D, and F: The potentials at 40 min after perfusion with 4-AP (5 mmol/L), TEA (50 mmol/L) and charybdotoxin (250 nmol/L), respectively. The upper left-hand horizontal bar indicates the membrane potential at 0 mV. Note that while action potential bursts were not elicited by 4-AP (5 mmol/L) or charybdotoxin (250 nmol/L), they were elicited by TEA (50 mmol/L).