486823.fig.0016a
(a)
486823.fig.0016b
(b)
486823.fig.0016c
(c)
486823.fig.0016d
(d)
Figure 16: Four types of current-voltage (I.V) relationships recorded from cells in PN slices. I.V curves were obtained by depolarizing step pulses from −80 to 80 mV. (a) Type II.V relationships showing outward rectification. Note that the I.V relationships measured at 50 ms (solid squares) and 550 ms of the 600 ms current pulse (open circle) are identical. (b) Type III.V relationships showing outward rectification with the time-dependent activation of the outward current. (c) Type III I.V relationships showing outward rectification with a time-dependent and linearly activated outward current. Note the lower current density in this cell. (d) Type IV I.V relationships showing outward rectification with a time-dependent and hyperbolic increase in the outward current. The insets show the current traces for the I.V relationships in (a) and (d). The holding potential is −30 (a) and −40 mV (b and d). The largest outward tail current is seen in the current traces of the type IV cell. Scale bars for the insets are 10 μm.