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. 2004 Feb 11;24(6):1358–1365. doi: 10.1523/JNEUROSCI.4022-03.2004

Figure 3.

Figure 3.

Expression of A-type K+ currents in astrocytes of the ventral respiratory group. A-D, Whole-cell voltage-clamp recordings in an intermediate astrocyte from the ventral respiratory group exposed to voltage pulses from -70 to +80 mV for 400 msec after prepulses to -110 mV (A, open circles in D) and -50 mV (B, filled circles in D). Point-by-point subtraction of the two recordings reveals the isolated transient current, which has the properties of an A-type K+ current (C). D, Calculated A-type currents (black triangles) determined 10 msec after the beginning of the voltage pulses are plotted against membrane potential. I-V curves show an activation potential of the K+ channels at -40 mV that is characteristic for A-type current. E, Amplitudes of A-type K+ currents derived from subtraction protocol (at +70 mV) in different types of astrocytes (data are given as mean ± SE).