Fig. 6. Comparison of effects of tetrodotoxin (TTX), lidocaine, and droperidol on Na⁺currents in isolated somata . (Left ) Na⁺currents recorded in control solution and in the presence of 30 nm TTX, 100 μm lidocaine, and 100 μm droperidol. (Right ) To compare the inactivation kinetics, each current recorded in the presence of the blocker was normalized to the peak amplitude of the corresponding control current.