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. 2006 May 25;574(Pt 3):819–834. doi: 10.1113/jphysiol.2006.107094

Figure 8. No negative slope region.

Figure 8

A, in control aCSF, repetitive firing (top panel) was observed to a current step injection (bottom panel). B, in control aCSF (thick trace), no negative slope region was observed to a voltage ramp command, even though sustained repetitive firing was observed. The addition of 1 mm TTX (thin trace) inhibited all Na+, and a larger outward current was observed.