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Figure 1


Fig. 1. Activation of skinned fibre bundles of anterior byssus retractor muscle (ABRM) with stepwise increase in Ca2+ concentrations. (A) Original recording of force and stiffness. The force spikes are induced by repetitive rectangular stretches of 20 ms duration and 0.1% L0 in amplitude. The free Ca2+ concentration is expressed as pCa (= -log[Ca2+]). The force recordings (insets) were obtained on another preparation; they show the force transients induced by rectangular stretches of about 5 s in duration and 0.2% L0 in amplitude applied at different stages of the experiment. (B) Relationship between stiffness and force at different Ca2+ activations in the experiment shown in A. The data points were obtained at the end of each individual Ca2+ activation.





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