SUMMARYResults suggest that actomyosin from muscle in rigor is more easily dissociated than actomyosin from prerigor muscle. The addition of MgCl2decreased the rate of ATP hydrolysis and extended the clear phase of the fibrillar protein extract. Pyrophosphate in the presence of magnesium was as effective as ATP in clearing actomyosin. As the ATP was hydrolyzed, the viscosity of the solution returned to values greater than those obtained before the addition of ATP. However, samples cleared with pyrophosphate retained their low viscosity characteristics indefinitely.
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