Fig. 3. Effects of [Ca2+]i on the fluctuations of membrane
potential. (A) Membrane potential fluctuation and (B) a fluctuation histogram
recorded from a cell injected with BAPTA. (C) Membrane potential fluctuation
and (D) a fluctuation histogram in the presence of 5 mmol l–1
BaCl2. Fluctuation amplitudes corresponding to the full width at
half maximum (FWHMs) of the distributions are shown on the right side of the
histograms.