Fig. 2. Low-voltage-activated calcium current recorded from a muscle cell dissociated at 30 °C. (A) Current traces recorded in whole-cell, voltage-clamp mode using a bath solution where calcium was replaced by 50 mmol l-1 SrCl2 to prevent run-down of this current. All potassium currents were blocked by CsOH, CsCl2 and TEA-Cl in the pipette solution (see Materials and methods). The stimulus protocol was a series of 25 ms test potentials with increments of 10 mV from -70 to +90 mV using a holding potential of -80 mV. (B) Mean I/V curve from 10 cells using the above protocols. Values are means ± S.E.M.
