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Bistability in the use of configuration space by the model channel. (A) The probability density of one or more VS domains being in translational position z versus transmembrane voltage. (B) The probability density of the gate having radius r versus transmembrane voltage. Probability density is in units of probability per length increment (0.064 nm for z and 0.0094 nm for r). Probabilities are computed from Eqs. 7 and 8, respectively. To see this figure in color, go online.
