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Figure 6 Representative current traces of chromanol-293b-insensitive current, as I_Kr, in rabbits of the control (a) and beta groups (b). The I_Kr elicited by the voltage-clamp protocol in the inset was normalized to the cell capacitance. (c) Measured maximum outward tail currents were averaged and plotted against the test potential. There was no difference between the beta group and control groups. (d) Measured amplitudes of I_K1 elicited by the voltage-clamp protocol in the inset were averaged and plotted against the test potential. The currents were normalized to the cell capacitance. There was no statistically significant difference between the two groups in the current–voltage relationship. (Data were obtained from isolated left ventricular myocytes from the M-cell region.) C = control.