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Due to an editorial error, a θ value in the right column appears as a τ value. The corrected sentence is given here:

Application of Eq. 4, assuming that only θ0 changes upon mutation and using a σ value of 200 s−1 , yields τo values of 3.7 and 2.2 ms for the βS4I and εS4I mutant receptors, respectively.