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. 2010 Jun 2;98(11):2601–2609. doi: 10.1016/j.bpj.2010.02.030

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Time course of actin-acrylodan-tropomyosin-troponin fluorescence changes after dissociation of S1 with ATP. (A) Absence of calcium. The smooth curve is a simulation of Eq. 3 with k₅ + k₆ = 434/s; k₇ + k₈ = 7.5/s. (B) Presence of calcium; the fitted curve has k₅ + k₆ = 375/s. Conditions were the same as in Fig. 1 with a temperature of 9.9°C.