The monovalent fragments of antibodies specific for skeletal muscle myosin inhibit myosin ATPase activity and dissociate the actomyosin complex, as shown by analytical ultracentrifugation and viscosity measurements.
Actin isolated from various invertebrate phyla comigrates with the beta-form of vertebrate smooth muscle actin. However, invertebrate actins are not identical, since antibodies to insect-actin will not crossreact with the other species.
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