Fig. 2.
Representative examples of inward currents observed in STTG1 cells, D54 cells, immature astrocytes, and mature astrocytes. Currents were elicited by a linear voltage-ramp protocol (-145 mV to +50 mV, holding at -40 mV) and were normalized to cell size (pA/pF). Trace 1, after 200 μM Ba2+; trace 2, control (5 mM [K+]o); trace 3, high or 20 mM [K+]o). The inset magnifies the inward current in the D54 glioma cells. Note the differences in current amplitude when comparing traces.