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Model 5: (a) The subunit structure of the channel model, (b) the open probability PO, (c) the mean open time τO, and (d) the mean close time τC. In the model K1=0.005 μM, K2=15.6 μM, K3=2.25 μM, K4=K1K2∕K3, K5=1.01 μM, and K0=0.135 μM with a0=535 μM−1 s−1.
