Figure 4. Temperature dependence of the k_tr–[Ca²⁺] relationship (A) and the k_tr–tension relationship (B).

In A, the relationship between tension and k_tr was curvilinear at all three temperatures; exponential fits of these data allowed for the determination of an extrapolated value of k_tr at zero tension (k_tr−min); this parameter is indicated on the y-axis in B. ^, 15°C; •, 20°C; ⋄, 25°C.