Abstract
Myosin B prepared by extraction of adductor muscle of P. yessoensis contains 2 components based on solubility in ammonium sulfate: the A component of myosin recipitated at 37-44% saturation and the B component of actomyosin at 28-37% saturation. The sensitivity of myosin B preparation of ATP which was determined by the change in light-scattering intensity proved that the critical ATP concentrations for combining with 10-minute, 30-minute and 24-hour extracts were 4.6, 4.8, and 4.7 [mu]mole/1 and that the functional unit weight values were 3.4, 3.7, and 40 x 10-5 g, respectively.

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