FmUgE 5 .
5(A) Voltage-dependence of the steady state open probability of IFM1303QQQ as derived from mean-variance analyses. The solid line is fit to the most hyperpolarized **data** points with a steepness factor of e-fold per 2.2 mV. The filled squares are derived from one patch using measurements at 10-mV intervals to span the full range of probabilities. The open squares are from another patch, sampling the steep region of the curve at 5-mV intervals. (Due to the variability in activation potential from one cell to the next, the open squares have all been shifted by -10 mV so that they match the voltage range observed in the first patch.)
