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Fig. 4. Measured AP recovery (symbols) compared with the volume-averaged model of
AP recovery (solid line) in small (A) and large (B) fibers. The measured AP
data have been normalized to a resting concentration of 34.3 mmol
l1 to coincide with that of the model. In the model, the
myosin ATPase was activated long enough to cause a decrease in AP that was
comparable to the measured data. The dotted line indicates the resting
concentration.