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Thick-filament extensibility in tetanized soleus (A) and EDL (B) skeletal muscle. The 2.86 nm spacing change as a function of tetanic tension is plotted. Both EDL and soleus muscle showed a nonlinear relationship between the 2.86 nm spacing change and active tension. The fits to a Hill model are shown (heavy line) along with 95% confidence levels (dotted lines).
